MOTOR VEHICLE EMISSION 

INSPECTION 

Chapter 173-422 WAC 

 Prepared by: 

 Washington State Department of Ecology 

 Air Quality Program 

 Adopted: February 28, 1980 

 Last Amended: June 3, 2002 

 

 

For your convenience, the 

Introduction lists documents 

related to this WAC. 
 

Disclaimer Notice: This document does not represent the official version of Motor Vehicle 

Emission Inspection (Chapter 173-422 WAC). This document was produced from the official 

version of the regulation maintained by the Office of the Code Reviser in a computer database. 

If there are any conflicts between the language contained in this document and the language 

contained in the official version of the regulation maintained by the Office of the Code Reviser, 

the language contained in the official version shall govern. 
Introduction

Guidelines for reading Department of Ecology Rules

What is a WAC? 

 WAC stands for Washington Administrative Code 

How do I read a WAC number? 

173.213.050 

At the bottom of each section there is a paragraph explaining the Statutory History of the rule 

related to that particular section. This paragraph explains what state laws provide the authority 

for the section to have been written. Both existing and repealed RCW’s will be included in this 

explanation. Below is an example of what this paragraph will look like. 

Statutory Authority: RCW 42.17.250. 98-16-052 (Order 98-12), § 173-03-010, filed 7/31/98, 

effective 8/31/98. Statutory Authority: RCW 43.17.060 and 42.17.260. 90-21-119 (Order 

90-37), § 173-03-010, filed 10/23/90, effective 11/23/90. Statutory Authority: RCW 42.17.250 

- 42.17.340. 78-02-041 (Order DE 77-35), § 173-03-010, filed 1/17/78.] 

Sometimes a WAC will refer to the Revised Code of Washington (RCW). 

What does RCW mean? 

RCW stands for Revised Code of Washington 

How do I read a RCW number? 

34.05.110 

 “213” This number represents a 

chapter within a given title. 

(Written as Chapter 173.213 

WAC)

“173” This is the Title 

number. Ecology rules are 

found under Titles 173, 508, 

317 and 197. 

“050” This number 

represents a section 

within the chapter. 

(Written as WAC 

173.213.050) 

 “05” (Written as 

Chapter 34.05 RCW) 

this number 

represents a chapter 

within a given title 

“34” This is the Title 

number. 

“110” (written as 

RCW 34.05.110) this 

number represents a 

section within the 

chapter. 
Related Documents:

RCWs related to Chapter 173-422 WAC: 

* Chapter 70.94 RCW 

* Chapter 70.120 RCW 

* Chapter 46.70 RCW 

* Chapter 46.16 RCW 

* Chapter 43.21B RCW 

To view related RCWs on-line go to http://www.ecy.wa.gov/laws-rules/ecyrcw.html

WACs related to Chapter 173-422 WAC: 

* Chapter 173-421 WAC 

To view related WACs on-line go to http://www.ecy.wa.gov/laws-rules/ecywac.html

To request paper copies of RCWs or WACs contact: 

Department of Ecology 

Public Records 

PO Box 47600 

Olympia, WA 98504-7600 

(360) 407-6038 

Other useful links: 

Ecology Publications: 

http://www.ecy.wa.gov/biblio/0111016.html

To request paper copies of an Ecology Publication contact: 

Washington State Department of Ecology 

Publications Distribution Office 

PO Box 47600 

Olympia, WA 98504-7600 

(360) 407-7472 

Air Program web page: 

http://www.ecy.wa.gov/programs/air/airhome.html
Background

Chapter 173-422 WAC implements the Washington Clean Air Act, chapter 70.94 RCW, 

as supplemented by the motor vehicle emission inspection provisions codified as chapter 

70.120 RCW. Gasoline motor vehicles are the primary emitters of carbon monoxide and 

emit significant quantities of hydrocarbons and oxides of nitrogen. Diesel motor vehicles 

are emitters primarily of particulates, hydrocarbons, and oxides of nitrogen. 

Emission controls required by the federal government are designed to reduce motor 

vehicle related air pollution. However, the effectiveness of these controls is substantially 

reduced through deterioration, maladjustment and tampering. Motor vehicle emission 

inspection serves to identify high polluting vehicles and vehicles with tampered or 

missing emission controls and to reduce their emissions, when such reduction can be 

accomplished at reasonable cost. 

This chapter establishes the emission standards, testing procedures, and associated 

activities necessary to implement a program of air pollution prevention and control 

resulting from motor vehicle emission inspections. 

The Most Recent Amendments:

The following is a list of the most recent amendments adopted to this chapter: 

* An upgrade to emission testing procedures for diesel cars and light trucks. 

* Clarification that all emission tests are valid for at least twelve months. 

* An additional requirement that automotive repair business need to be able to 

check the on-board diagnostic system of 1996 and newer vehicles, if they wish 

to be on the list of shops given to owners of failed vehicles. 

* Obsolete language was removed. 
Chapter173-422 WAC [ 1 ] Department of Ecology 

Chapter 173-422 WAC

MOTOR VEHICLE EMISSION 

INSPECTION 

Last Update: 11/1/00 

WAC 173-422-010 Purpose.............................................................................................................1 

WAC 173-422-020 Definitions........................................................................................................2 

WAC 173-422-030 Vehicle emission inspection requirement. .......................................................4 

WAC 173-422-031 Vehicle emission inspection schedules............................................................4 

WAC 173-422-035 Registration requirements. ...............................................................................6 

WAC 173-422-040 Noncompliance areas.......................................................................................6 

WAC 173-422-050 Emission contributing areas.............................................................................6 

WAC 173-422-060 Gasoline vehicle emission standards. ..............................................................8 

WAC 173-422-065 Diesel vehicle exhaust emission standards. .....................................................11 

WAC 173-422-070 Gasoline vehicle exhaust emission testing procedures. ...................................11 

WAC 173-422-075 Diesel vehicle inspection procedure. ...............................................................13 

WAC 173-422-090 Exhaust gas analyzer specifications.................................................................13 

WAC 173-422-095 Exhaust opacity testing equipment. .................................................................14 

WAC 173-422-100 Testing equipment maintenance and calibration..............................................14 

WAC 173-422-120 Quality assurance.............................................................................................14 

WAC 173-422-130 Inspection fees. ................................................................................................15 

WAC 173-422-145 Fraudulent certificates of compliance/acceptance. ..........................................15 

WAC 173-422-160 Fleet and diesel owner vehicle testing requirements. ......................................16 

WAC 173-422-170 Exemptions. .....................................................................................................17 

WAC 173-422-175 Fraudulent exemptions.....................................................................................18 

WAC 173-422-190 Emission specialist authorization.....................................................................18 

WAC 173-422-195 Listing of authorized emission specialists. ......................................................20 

Disposition of sections formerly codified in this chapter ..................................................................21 

WAC 173-422-010 

 Purpose. 

This chapter implements the Washington Clean Air Act, chapter 70.94 RCW, as supplemented 

by the motor vehicle emission inspection provisions codified as chapter 70.120 RCW. Gasoline 

motor vehicles are the primary emitters of carbon monoxide and emit significant quantities of 

hydrocarbons and oxides of nitrogen. Diesel motor vehicles are emitters primarily of 

particulates, hydrocarbons, and oxides of nitrogen. Emission controls required by the federal 

government are designed to reduce motor vehicle related air pollution. However, the 

effectiveness of these controls is substantially reduced through deterioration, maladjustment and 

tampering. Motor vehicle emission inspection serves to identify high polluting vehicles and 

vehicles with tampered or missing emission controls and to reduce their emissions, when such 

reduction can be accomplished at reasonable cost. These rules establish the emission standards, 

testing procedures, and associated activities necessary to implement a program of air pollution 

prevention and control resulting from motor vehicle emission inspections. 
Chapter173-422 WAC [ 2 ] Department of Ecology 

[Statutory Authority: Chapter 70.120 RCW. 93-10-062 (Order 91-46), § 173-422-010, filed 5/3/93, effective 

6/3/93. Statutory Authority: RCW 70.120.120, 43.21A.080, 70.94.331 and 70.94.141(1). 83-23-115 (Order DE 83-

31), § 173-422-010, filed 11/23/83, effective 1/2/84. Statutory Authority: RCW 70.120.120. 80-03-070 (Order DE 

79-35), § 173-422-010, filed 2/28/80.] 

WAC 173-422-020 

Definitions. 

Unless a different meaning is clearly indicated by context, the following definitions will apply: 

(1) "Appropriate repair" means the diagnosis of the cause(s) of an emission test failure 

and the repair of one or more of these causes. An appropriate repair should reduce at 

least one emission test reading. 

(2) "Certificate of acceptance" means an official form, issued by someone authorized by 

the department, which certifies that the following conditions have been met: 

 (a) The vehicle failed an emission inspection; and 

 (b) The vehicle failed a reinspection; and 

(c) The vehicle has been in use for more than five years or fifty thousand miles; 

and 

(d) All primary emission control components installed by the vehicle 

manufacturer, or its appropriate replacement, are installed and operative; and 

(e) The recipient has provided original receipts listing and providing the cost of 

each appropriate repair performed by an authorized emission specialist between 

the initial and last inspection; and 

 (f) The total cost of the appropriate repairs must equal or exceed: 

 Pre-1981 vehicles $100 

 1981 and newer $150 

If needed to prevent federal sanctions, the minimum total cost of appropriate 

repairs required to obtain a certificate of acceptance may be increased to four 

hundred fifty dollars. 

Before increasing the repair cost requirement ecology shall evaluate ways to 

alleviate the economic hardships resulting from vehicle repair costs incurred by 

vehicle owners in an effort to comply with this regulation. 
Chapter173-422 WAC [ 3 ] Department of Ecology 

(3) "Certificate of compliance" means an official form, issued by someone authorized by 

the department, which certifies that the recipient's vehicle on inspection complied with 

applicable emission inspection standards. 

(4) "Authorized emission specialist" means an individual who has been issued a 

certificate of instruction by the department as authorized in RCW 70.120.020 (2)(a) and 

has maintained the certification by meeting requirements of WAC 173-422-190(2). 

(5) "Dealer" means a motor vehicle dealer, as defined in chapter 46.70 RCW as amended, 

that is licensed pursuant to chapter 46.70 RCW. 

 (6) "Department" means the department of ecology. 

(7) "Emission contributing area" means a land area within whose boundaries are 

registered motor vehicles that contribute significantly to the violation of motor vehicle 

related air quality standards in a noncompliance area. 

(8) "Fleet" means a group of fifteen or more motor vehicles owned or leased concurrently 

by one owner assigned a fleet identifier code by the department of licensing. 

(9) "Gross vehicle weight rating (GVWR)" means the manufacturer stated gross vehicle 

weight rating. 

(10) "Motor vehicle" means any self-propelled vehicle required to be licensed pursuant to 

chapter 46.16 RCW. 

(11) "Noncompliance area" means a land area within whose boundaries any air quality 

standard for any air contaminant from the emissions of motor vehicles will probably be 

exceeded. 

 (12) "PPM" means parts per million by volume. 

(13) "Primary emission control components" means the components of the vehicle 

installed by the manufacturer for the purpose of reducing emissions or its replacement or 

modification which is acceptable to the United States Environmental Protection Agency. 

These components are the fuel inlet restrictor, the catalytic converter or thermal reactor, 

the air injection system components, the thermostatic air cleaner, the exhaust gas 

recirculation system components, the evaporative emission system components including 

the gas cap, the positive crankcase ventilation system components and the electronic 

control unit components that control the air/fuel mixture and/or ignition timing including 

all related sensors. 

The primary emission control components of a vehicle with a different engine than the 

engine originally installed shall be an Environmental Protection Agency certified 

engine/emission control combination for that vehicle or its newer model. 

[Statutory Authority: Chapter 70.120 RCW. 95-06-068 (Order 93-35), § 173-422-020, filed 2/28/95, effective 

3/31/95; 94-05-039 (Order 93-10), § 173-422-020, filed 2/8/94, effective 3/11/94; 93-10-062 (Order 91-46), § 173-
Chapter173-422 WAC [ 4 ] Department of Ecology 

422-020, filed 5/3/93, effective 6/3/93; 90-06-062, § 173-422-020, filed 3/6/90, effective 4/6/90. Statutory 

Authority: RCW 70.120.120, 43.21A.080, 70.94.331 and 70.94.141(1). 83-23-115 (Order DE 83-31), § 173-422-

020, filed 11/23/83, effective 1/2/84. Statutory Authority: RCW 70.120.120. 80-03-070 (Order DE 79-35), § 173-

422-020, filed 2/28/80.] 

WAC 173-422-030 

Vehicle emission inspection requirement. 

All motor vehicles, not specifically exempted by WAC 173-422-170, which are registered or 

reregistered within the boundaries of an emission contributing area, as specified in WAC 173-

422-050, are subject to the vehicle emission inspection requirements of this chapter. In addition, 

the department may require an emission inspection of a motor vehicle, except military tactical 

vehicles, operated for more than sixty days a year on a federal installation located within an 

emission contributing area, or a vehicle garaged at a location within an emission contributing 

area, or a vehicle which has previously passed an emission inspection but has been identified 

using on road testing as likely to no longer comply with the inspection standards. Neither the 

department of licensing nor its agents may change the registered owner or may issue or renew a 

motor vehicle license for any vehicle registered in an emission contributing area, as that area is 

established under RCW 70.120.150, unless the application for issuance or renewal is: (1) 

Accompanied by a valid certificate of compliance issued pursuant to RCW 70.120.080 or 

70.120.170 or a valid certificate of acceptance issued pursuant to RCW 70.120.070; or (2) 

exempted from this requirement pursuant to RCW 46.16.015(2). The certificates must have a 

date of validation which is within six months of the date of application for the vehicle license, 

license renewal or registered owner change. However, (a) an emission inspection used to change 

the registered owner may also be used to renew the current license; (b) an emission inspection 

used to obtain the current license may also be used to change the registered owner. Certificates 

for fleet or owner tested vehicles may have a date of validation which is within twelve months of 

the assigned license renewal date. 

[Statutory Authority: Chapter 70.120 RCW. 96-21-029 (Order 95-11), § 173-422-030, filed 10/9/96, effective 

11/9/96; 95-06-068 (Order 93-35), § 173-422-030, filed 2/28/95, effective 3/31/95; 94-05-039 (Order 93-10), § 173-

422-030, filed 2/8/94, effective 3/11/94; 93-10-062 (Order 91-46), § 173-422-030, filed 5/3/93, effective 6/3/93. 

Statutory Authority: RCW 70.120.120, 43.21A.080, 70.94.331 and 70.94.141(1). 83-23-115 (Order DE 83-31), § 

173-422-030, filed 11/23/83, effective 1/2/84. Statutory Authority: RCW 70.120.120. 80-03-070 (Order DE 79-

35), § 173-422-030, filed 2/28/80.] 

WAC 173-422-031 

Vehicle emission inspection schedules. 

(1) Vehicles five through twenty-five years old, other than state and local government 

vehicles, shall be inspected every other year as described in the table below. This does 

not apply to vehicles that have already been inspected during the current licensing period 

due to a change of ownership. 

Year Model Year of Vehicles Needing 

Inspection

2000 1976, 1978, 1980, 1982, 1984, 1986, 
Chapter173-422 WAC [ 5 ] Department of Ecology 

1988, 1990, 1992, 1994 

2001 1977, 1979, 1981, 1983, 1985, 1987, 

1989, 1991, 1993, 1995, 1996 

2002 1978, 1980, 1982, 1984, 1986, 1988, 

1990, 1992, 1994, 1997 

2003 1979, 1981, 1983, 1985, 1987, 1989, 

1991, 1993, 1995, 1996, 1998 

2004 1980, 1982, 1984, 1986, 1988, 1990, 

1992, 1994, 1997, 1999 

2005 1981, 1983, 1985, 1987, 1989, 1991, 

1993, 1995, 1996, 1998, 2000 

2006 1982, 1984, 1986, 1988, 1990, 1992, 

1994, 1997, 1999, 2001 

2007 1983, 1985, 1987, 1989, 1991, 1993, 

1995, 1996, 1998, 2000, 2002 

2008 1984, 1986, 1988, 1990, 1992, 1994, 

1997, 1999, 2001, 2003 

2009 1985, 1987, 1989, 1991, 1993, 1995, 

1996, 1998, 2000, 2002, 2004 

2010 1986, 1988, 1990, 1992, 1994, 1997, 

1999, 2001, 2003, 2005 

(2) State and local government vehicles five through twenty-five years old shall be 

inspected yearly as described in the table below. 

Year Model Year of Vehicles Needing 

Inspection

2000 1975 through 1995 

2001 1976 through 1996 

2002 1977 through 1997 

2003 1978 through 1998 

2004 1979 through 1999 

2005 1980 through 2000 

2006 1981 through 2001 

2007 1982 through 2002 

2008 1983 through 2003 

2009 1984 through 2004 

2010 1985 through 2005 

[Statutory Authority: RCW 70.120.120. 00-22-120 (Order 00-15), § 173-422-031, filed 11/1/00, effective 12/2/00.] 
Chapter173-422 WAC [ 6 ] Department of Ecology 

WAC 173-422-035 

Registration requirements. 

(1) Persons residing in emission contributing areas as defined under WAC 173-422-050 

shall register their motor vehicles within that area. 

(2) Any person who violates this section shall reregister their motor vehicle within the 

emission contributing area, obtain a certificate of compliance or acceptance within thirty 

days, and is subject to a civil penalty not to exceed two hundred fifty dollars for each 

violation. 

(3) Any civil penalty imposed by the department hereunder shall be appealable to the 

pollution control hearings board as provided for in chapter 43.21B RCW. 

[Statutory Authority: Chapter 70.120 RCW. 95-06-068 (Order 93-35), § 173-422-035, filed 2/28/95, effective 

3/31/95; 93-10-062 (Order 91-46), § 173-422-035, filed 5/3/93, effective 6/3/93; 90-06-062, § 173-422-035, filed 

3/6/90, effective 4/6/90.] 

WAC 173-422-040 

Noncompliance areas. 

The following areas are designated noncompliance areas for the air contaminants specified: 

Carbon monoxide 

 (1) The city of Seattle. 

 (2) The city of Bellevue. 

 (3) The city of Spokane. 

 (4) The city of Tacoma. 

 (5) The city of Vancouver. 

 (6) The city of Everett. 

[Statutory Authority: Chapter 70.120 RCW. 93-10-062 (Order 91-46), § 173-422-040, filed 5/3/93, effective 

6/3/93; 90-06-062, § 173-422-040, filed 3/6/90, effective 4/6/90. Statutory Authority: RCW 70.120.120, 

43.21A.080, 70.94.331 and 70.94.141(1). 83-23-115 (Order DE 83-31), § 173-422-040, filed 11/23/83, effective 

1/2/84. Statutory Authority: RCW 70.120.120. 82-02-027 (Order DE 81-32), § 173-422-040, filed 12/31/81; 80-

03-070 (Order DE 79-35), § 173-422-040, filed 2/28/80.]

WAC 173-422-050 

Emission contributing areas. 
Chapter173-422 WAC [ 7 ] Department of Ecology 

Emission contributing areas within which the motor vehicle emission inspection program applies 

are designated by the following United States Postal Service ZIP codes as of September 1, 1994, 

set forth below: 

(1) Puget Sound Region 

98001 98036 98083 

98002 98037 98092 

98003 98038 98093 

98004 98039 98101 thru 98199 

98005 98040 inclusive except 98110

98006 98041 98201 thru 98208 

98007 98042 98258 

98008 98043 98270 

98009 98046 98271 

98011 98047 98275 

98012 98052 98290 

98015 98053 98291 

98020 98054 98327 

98021 98055 98332 

98023 98056 98335 

98025 98057 98338 

98026 98058 98344 

98027 98059 98352 

98028 98062 98354 

98031 98063 98371 thru 98374 

98032 98064 98387 

98033 98071 98388 

98034 98072 98390 

98035 98073 98401 thru 98499 

 (2) Spokane Region 

99001 

99005 

99014 

99016 

99019 

99021 

99025 

99027 

99037 

99201 thru 99299 

 (3) Vancouver Region 
Chapter173-422 WAC [ 8 ] Department of Ecology 

98604 except north of N.E. 279th Street 

98606 

98607 

98629 except east of N.E. 50th Avenue 

98642 

98660 thru 98668 

98671 except Skamania County 

98682-86 

[Statutory Authority: Chapter 70.120 RCW. 96-21-029 (Order 95-11), § 173-422-050, filed 10/9/96, effective 

11/9/96; 95-06-068 (Order 93-35), § 173-422-050, filed 2/28/95, effective 3/31/95; 94-05-039 (Order 93-10), § 

173-422-050, filed 2/8/94, effective 3/11/94; 93-10-062 (Order 91-46), § 173-422-050, filed 5/3/93, effective 6/3/93; 

84-09-087 (Order DE 84-7), § 173-422-050, filed 4/18/84. Statutory Authority: RCW 70.120.120, 43.21A.080, 

70.94.331 and 70.94.141(1). 83-23-115 (Order DE 83-31), § 173-422-050, filed 11/23/83, effective 1/2/84. 

Statutory Authority: RCW 70.120.120. 82-02-027 (Order DE 81-32), § 173-422-050, filed 12/31/81; 80-03-070 

(Order DE 79-35), § 173-422-050, filed 2/28/80.] 

WAC 173-422-060 

Gasoline vehicle emission standards. 

Gasoline motor vehicles subject to this chapter shall: 

(1) When tested using the exhaust emission testing procedures described in (II) Two 

Speed Idle Test or (III) Loaded Test of Appendix B Test Procedures of Subpart SInspection/Maintenance Program Requirements of Part 51 of Chapter 1, Title 40 of the 

Code of Federal Regulations adopted November 1, 1992, meet the applicable exhaust 

emission standards from the following table during both the idle and higher speed mode 

prior to receiving a certificate of compliance. 

 

(2) When tested using the acceleration simulation mode (ASM) procedure specified in 

WAC 173-422-070 meet the following standards during that mode and the applicable 

standard from WAC 173-422-060(1) during the idle mode to receive a certificate of 

compliance. ASM testing will not start in a region until ecology has considered all 

comments on the need for ASM testing obtained at a public hearing held in that region. 

Compliance with the NOx standards will not be required of vehicles tested in a region 

until the following conditions are met: 

(a) Ecology has determined that a reduction of NOx emissions in that region will 

assist in attaining or maintaining the national air quality standard for ozone. 

(b) Ecology has considered all comments received at a public hearing held in that 

region. 

(c) For at least twenty-four months prior, the vehicle emission test reports have 

included the NOx reading. 
Chapter173-422 WAC [ 9 ] Department of Ecology 

ASM Mode Exhaust Emission Standards 

Model Year Test 

Weight (lbs.) 

CO(%).* HC(ppm) NOx(ppm).* 

1968-1974 cars and trucks (0-8500 lbs. GVWR) 

1750 7.3 690 None 

1875 6.8 650 

2000 6.5 620 

2125 6.1 580 

2250 5.8 550 

2375 5.5 520 

2500 5.2 500 

2625 5.0 470 

2750 4.7 450 

2875 4.5 430 

3000 4.3 410 

3125 4.2 400 

3250 4.0 400 

3375 3.9 400 

3500 3.7 400 

3635 3.6 400 

cars 3750 & greater3.5 400 

trucks 3750 & 

greater 

4.0 500 

1975-1980 cars and trucks (0-8500 lbs. GVWR) 

1750 4.2 400 None 

1875 4.0 380 

2000 3.8 350 

2125 3.6 340 

2250 3.4 320 

2375 3.2 300 

2500 3.0 290 

2625 2.9 270 

2750 2.8 260 

2875 2.7 250 

3000 2.6 240 

3125 2.5 230 
Chapter173-422 WAC [ 10 ] Department of Ecology 

Model Year Test 

Weight (lbs.) 

CO(%).* HC(ppm) NOx(ppm).* 

3250 2.4 220 

3375 2.3 220 

3500 2.2 210 

3625 2.1 200 

cars 3750 & greater2.1 200 

trucks 3750 & 

greater 

2.5 300 

1981 & newer cars and trucks (0-8500 lbs. GVWR) 

1750 1.8 250 1500 

1875 1.7 240 1500 

2000 1.6 220 1500 

2125 1.5 210 1500 

2250 1.5 200 1500 

2375 1.4 190 1500 

2500 1.3 180 1500 

2625 1.3 180 1500 

2750 1.2 170 1500 

2875 1.2 160 1500 

3000 1.1 160 1500 

3125 1.1 150 1500 

3250 1.0 150 1500 

3375 1.0 150 1500 

3500 1.0 150 1500 

3625 1.0 150 1500 

cars 3750 & greater1.0 150 1500 

trucks 3750 & 

greater 

1.5 200 2000 

*The concentration of the gases, carbon monoxide (CO) and hydrocarbons 

(HC), oxides of nitrogen (NOx) measured as either a percentage (%) or 

parts per million (ppm) of the exhaust volume. 

(3) If a 1971 or newer model year vehicle, the gasoline filler cap must not leak more than 

60 cubic centimeters per minute at a pressure of 30 inches of water. Gas cap checking 

will not start in a region until ecology has considered all comments on the need for gas 

cap checking obtained at a public hearing held in that region. 

 

(4) If a 1996 or newer model vehicle is equipped with an Environmental Protection 

Agency certified on-board diagnostic (OBD) system, the information stored in the on-
Chapter173-422 WAC [ 11 ] Department of Ecology 

board computer must indicate that all emission-related functional checks have been 

completed and no malfunctions detected. 

Exhaust Emission Standards 

Model Year CO(%).

* 

HC 

(ppm).* 

68-74 6.0 900 

75-80 3.0 600 

81-99 (0-8500 

GVWR) 

 1.2 220 

81-99 (Greater 

than 8500 GVWR) 

 3.0 400 

*The concentration of the gases, carbon monoxide (CO) and hydrocarbons 

(HC), measured as either a percentage (%) or parts per million (ppm) of the 

exhaust volume. 

[Statutory Authority: Chapter 70.120 RCW. 96-21-029 (Order 95-11), § 173-422-060, filed 10/9/96, effective 

11/9/96; 95-06-068 (Order 93-35), § 173-422-060, filed 2/28/95, effective 3/31/95; 93-10-062 (Order 91-46), § 173-

422-060, filed 5/3/93, effective 6/3/93; 90-06-062, § 173-422-060, filed 3/6/90, effective 4/6/90. Statutory 

Authority: RCW 70.120.120, 43.21A.080, 70.94.331 and 70.94.141(1). 83-23-115 (Order DE 83-31), § 173-422-

060, filed 11/23/83, effective 1/2/84. Statutory Authority: RCW 70.120.120. 82-02-027 (Order DE 81-32), § 173-

422-060, filed 12/31/81; 80-03-070 (Order DE 79-35), § 173-422-060, filed 2/28/80.] 

WAC 173-422-065 

Diesel vehicle exhaust emission standards. 

Diesel motor vehicles subject to this chapter shall meet the following opacity standards using the 

test procedures specified in WAC 173-422-075. 

 Model Year Opacity (%) 

1968 - 1973 70 

1974 - 1991 60 

1992 and later 40 

[Statutory Authority: Chapter 70.120 RCW. 95-06-068 (Order 93-35), § 173-422-065, filed 2/28/95, effective 

3/31/95; 93-10-062 (Order 91-46), § 173-422-065, filed 5/3/93, effective 6/3/93.] 

WAC 173-422-070 

Gasoline vehicle exhaust emission testing procedures. 

All persons certified by, or under contract to, the department to conduct motor vehicle emission 

inspections shall use the exhaust emission testing procedures described in (II) Two Speed Idle 
Chapter173-422 WAC [ 12 ] Department of Ecology 

Test; or (III) Loaded Test of Appendix B-Test Procedures of Subpart S-Inspection/Maintenance 

Program Requirements of Part 51 of chapter 1, Title 40 of the Code of Federal Regulations 

adopted November 1, 1992, except that the department may require that the following 

Acceleration Simulation Mode (ASM) test procedure replace the cruise mode of the loaded test. 

Equivalent procedures may be approved by the department. 

Variations to the procedures specified may be established by the department for all or certain 

vehicles. Vehicles, not repaired as required by an emission recall for which owner notification 

was attempted after January 1, 1995, shall not be inspected until compliance with the recall is 

established. 

Acceleration Simulation Mode (ASM) 

1. Dynamometer Load: Set dynamometer horsepower load equal to [Vehicle 

Weight (lbs.).+ 300]/300. An Environmental Protection Agency specified 

loading may also be used. 

2. Vehicle Gear Selection: Vehicles with automatic transmissions use Drive (not 

Overdrive), vehicles with manual transmissions use second gear unless the 

engine speed exceeds 2500 revolutions per minute (measured by the vehicle's 

tachometer or by an evaluation of the vehicle's sound) then use third gear. 

3. Vehicle Speed: Set vehicle speed at 25 miles per hour (mph) 1.5± mph. 

4. Pass or Fail Determinations: Once the vehicle has been operating at 25 mph 

for 15 seconds, begin measuring exhaust HC, CO, CO2, and NOx each second. 

The reading for pass or fail determinations is the running average of five 

measurements. When a final pass or fail determination is made, this mode will 

be stopped and the final readings recorded. 

5. Fast Pass (HC, CO): When NOx is not measured, the vehicle will pass after 

15 or more seconds of measurements if: Both HC and CO readings are passing, 

and three successive one second measurements are equal to or less than the HC 

and CO standards and are within 20 ppm HC and 0.20% CO of each other. 

6. Fast Pass (HC, CO, NOx): When NOx is measured, the vehicle will pass after 

45 or more seconds of measurements if the HC, CO and NOx readings are equal 

to or less than the standards. 

7. Fast Fail: The vehicle will fail after 15 or more seconds of measurements 

when: HC reading exceeds 1800 ppm, or the CO reading exceeds 9.0 percent. 

8. Full Term Pass/Fail: The vehicle will pass or fail after 90 seconds of 

measurements unless emission readings are declining at a rate that indicates that 

failing vehicle will pass within the next 30 seconds. Then up to an additional 30 

seconds of measurements will be taken before the vehicle fails. 

[Statutory Authority: Chapter 70.120 RCW. 96-21-029 (Order 95-11), § 173-422-070, filed 10/9/96, 

effective 11/9/96; 95-06-068 (Order 93-35), § 173-422-070, filed 2/28/95, effective 3/31/95; 94-05-039 

(Order 93-10), § 173-422-070, filed 2/8/94, effective 3/11/94; 93-10-062 (Order 91-46), § 173-422-070, 

filed 5/3/93, effective 6/3/93; 90-06-062, § 173-422-070, filed 3/6/90, effective 4/6/90. Statutory 
Chapter173-422 WAC [ 13 ] Department of Ecology 

Authority: RCW 70.120.120, 43.21A.080, 70.94.331 and 70.94.141(1). 83-23-115 (Order DE 83-31), § 

173-422-070, filed 11/23/83, effective 1/2/84. Statutory Authority: RCW 70.120.120. 82-02-027 (Order 

DE 81-32), § 173-422-070, filed 12/31/81; 80-03-070 (Order DE 79-35), § 173-422-070, filed 2/28/80.] 

NOTES:

Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the 

agency. 

WAC 173-422-075 

Diesel vehicle inspection procedure. 

Diesel vehicles shall be tested using the following procedure: 

(1) With the transmission in neutral, move the accelerator pedal from normal idle as 

rapidly as possible to the full power position, and hold in this position until the speed 

governor limits the engine speed or the engine might exceed the maximum speed allowed 

by the vehicle manufacturer. 

 

 (2) Fully release the accelerator pedal so the engine decelerates to normal idle. 

 

(3) Measure the smoke opacity with an opacity meter which meets the requirements 

specified in WAC 173-422-095 continuously during the test. 

 

 (4) Record the peak opacity reading. 

 

(5) Repeat the previous steps up to ten times if necessary to obtain a peak opacity reading 

and two peak readings immediately following it that are equal to or less than the standard 

established in WAC 173-422-065. 

[Statutory Authority: Chapter 70.120 RCW. 94-05-039 (Order 93-10), § 173-422-075, filed 2/8/94, effective 

3/11/94; 93-10-062 (Order 91-46), § 173-422-075, filed 5/3/93, effective 6/3/93.] 

WAC 173-422-090 

Exhaust gas analyzer specifications. 

Only exhaust gas analyzers meeting the specifications contained in (I) Steady-State Exhaust 

Analysis System of Appendix D-Steady-State Short Test Equipment of Subpart SInspection/Maintenance Program Requirements of Part 51 of chapter 1, Title 40 of the Code of 

Federal Regulations adopted November 1, 1992, at the time of certification testing may be used 

for certification testing, unless equivalent specifications have been approved by the department. 

[Statutory Authority: Chapter 70.120 RCW. 95-06-068 (Order 93-35), § 173-422-090, filed 2/28/95, effective 

3/31/95; 93-10-062 (Order 91-46), § 173-422-090, filed 5/3/93, effective 6/3/93; 90-06-062, § 173-422-090, filed 

3/6/90, effective 4/6/90. Statutory Authority: RCW 70.120.120, 43.21A.080, 70.94.331 and 70.94.141(1). 83-23-

115 (Order DE 83-31), § 173-422-090, filed 11/23/83, effective 1/2/84. Statutory Authority: RCW 70.120.120. 82-

02-027 (Order DE 81-32), § 173-422-090, filed 12/31/81; 80-03-070 (Order DE 79-35), § 173-422-090, filed 

2/28/80.] 
Chapter173-422 WAC [ 14 ] Department of Ecology 

WAC 173-422-095 

Exhaust opacity testing equipment. 

The exhaust opacity measurement shall be conducted using an opacity meter approved by the 

department. 

 The opacity meter shall: 

 (1) Automatically calibrates itself before each test. 

 (2) Provide for continuous measurement of exhaust opacity unaffected by rain or wind. 

[Statutory Authority: Chapter 70.120 RCW. 94-05-039 (Order 93-10), § 173-422-095, filed 2/8/94, effective 

3/11/94; 93-10-062 (Order 91-46), § 173-422-095, filed 5/3/93, effective 6/3/93.] 

WAC 173-422-100 

Testing equipment maintenance and calibration. 

(1) Unless alternative procedures have been approved or required by the department all 

equipment used in the inspection shall be calibrated and maintained according to the 

manufacturer's specifications and recommendations. Complete logs as approved by the 

department shall be kept for maintenance, repair, and calibration. 

 

(2) The procedures for equipment maintenance and calibration procedures described in 

(I) Steady-State Test Equipment of Appendix A-Calibrations, Adjustments and Quality 

Control of Subpart S-Inspection/Maintenance Program Requirements of Part 51 of 

chapter 1, Title 40 of the Code of Federal Regulations adopted November 1, 1992, shall 

be followed by all testing facilities unless equivalent procedures have been approved by 

the department. 

[Statutory Authority: Chapter 70.120 RCW. 95-06-068 (Order 93-35), § 173-422-100, filed 2/28/95, effective 

3/31/95; 93-10-062 (Order 91-46), § 173-422-100, filed 5/3/93, effective 6/3/93; 90-06-062, § 173-422-100, filed 

3/6/90, effective 4/6/90. Statutory Authority: RCW 70.120.120, 43.21A.080, 70.94.331 and 70.94.141(1). 83-23-

115 (Order DE 83-31), § 173-422-100, filed 11/23/83, effective 1/2/84. Statutory Authority: RCW 70.120.120. 82-

02-027 (Order DE 81-32), § 173-422-100, filed 12/31/81; 80-03-070 (Order DE 79-35), § 173-422-100, filed 

2/28/80.] 

WAC 173-422-120 

Quality assurance. 

The department, or its designee, may monitor the operation of each authorized emission 

inspection/certification facility with unidentified or unannounced and unscheduled inspections to 

check the calibration and maintenance of the exhaust analyzers, test procedures, and records. 

 
Chapter173-422 WAC [ 15 ] Department of Ecology 

The department (or its designee) may immediately require the suspension of vehicle 

inspections/certifications in all or part by the inspection/certification facility if violations of this 

chapter are found during an audit of the inspection facility. 

[Statutory Authority: Chapter 70.120 RCW. 95-06-068 (Order 93-35), § 173-422-120, filed 2/28/95, effective 

3/31/95; 93-10-062 (Order 91-46), § 173-422-120, filed 5/3/93, effective 6/3/93. Statutory Authority: RCW 

70.120.120, 43.21A.080, 70.94.331 and 70.94.141(1). 83-23-115 (Order DE 83-31), § 173-422-120, filed 11/23/83, 

effective 1/2/84. Statutory Authority: RCW 70.120.120. 80-03-070 (Order DE 79-35), § 173-422-120, filed 

2/28/80.] 

WAC 173-422-130 

Inspection fees. 

At an inspection facility operated under contract to the state, the fee for the first emission 

inspection on each vehicle applicable to a vehicle license year shall be fifteen or less dollars. If 

the vehicle fails, one reinspection will be provided free of charge at any inspection station 

operated under contract to the state, provided that the reinspection is applicable to the same 

vehicle license year. Any additional reinspection of a failed vehicle applicable to the same 

vehicle license year will require the payment of fifteen or less dollars.

[Statutory Authority: RCW 70.120.080, 70.120.170 (4)(a), 46.16.015 (2)(h) and 70.120.120. 99-24-021 (Order 99-

19), § 173-422-130, filed 11/22/99, effective 12/31/99. Statutory Authority: Chapter 70.120 RCW. 94-05-039 

(Order 93-10), § 173-422-130, filed 2/8/94, effective 3/11/94. Statutory Authority: RCW 70.120.170 (4)(a). 93-20-

010 (Order 93-15), § 173-422-130, filed 9/22/93, effective 10/23/93. Statutory Authority: Chapter 70.120 RCW. 

93-10-062 (Order 91-46), § 173-422-130, filed 5/3/93, effective 6/3/93; 90-06-062, § 173-422-130, filed 3/6/90, 

effective 4/6/90. Statutory Authority: RCW 70.120.040(7). 87-02-051 (Order DE 86-32), § 173-422-130, filed 

1/7/87, effective 4/1/87. Statutory Authority: RCW 70.120.120. 82-02-027 (Order DE 81-32), § 173-422-130, filed 

12/31/81; 80-03-070 (Order DE 79-35), § 173-422-130, filed 2/28/80.] 

WAC 173-422-145 

Fraudulent certificates of compliance/acceptance. 

 

(1) (a) Obtaining or attempting to obtain a certificate of compliance by (i) providing 

false information or (ii) any fraudulent means; or 

(b) Obtaining or attempting to obtain a certificate of acceptance (i) through the 

use of receipts or other documentation containing false information, or (ii) any 

fraudulent means shall be construed as a violation of these rules implementing 

chapter 70.94 RCW as supplemented by chapter 70.120 RCW. 

(2) Any person who commits such violation or who aids or abets another in committing 

the same shall be subject to a civil penalty not to exceed two hundred fifty dollars for 

each violation. 

(3) For the purposes of this section the term "expended" refers to the net actual cost to the 

vehicle owner in the purchase of repairs or parts derived after the amount of any rebate, 

discount or cash-return has been subtracted. 

(4) Any civil penalty imposed by the department hereunder shall be appealable to the 

pollution control hearing board as provided for in chapter 43.21B RCW. 
Chapter173-422 WAC [ 16 ] Department of Ecology 

[Statutory Authority: Chapter 70.120 RCW. 90-06-062, § 173-422-145, filed 3/6/90, effective 4/6/90. Statutory 

Authority: RCW 70.120.120, 43.21A.080, 70.94.331 and 70.94.141(1). 83-23-115 (Order DE 83-31), § 173-422-

145, filed 11/23/83, effective 1/2/84.] 

WAC 173-422-160 

Fleet and diesel owner vehicle testing requirements. 

The department may authorize emission inspections by fleet operators including government 

agencies and the owners of diesel motor vehicles with a gross vehicle weight rating in excess of 

8500 pounds or by an automotive service or testing facility engaged by the vehicle owner for 

such activity. Authorizations to conduct emission tests and issue certificates of compliance 

under this section are limited to authorized fleet vehicles or diesel vehicles with a gross vehicle 

weight rating in excess of 8500 pounds. 

 

(1) All persons engaged in testing of gasoline fleet or diesel vehicles must comply with 

all applicable provisions of this chapter except as approved by the department. 

 

(2) All persons conducting tests for the purpose of issuing certificates for fleet or diesel 

vehicles shall be ecology authorized emission specialists. 

 

(3) Legibly completed forms will constitute certificates of compliance for licensing 

purposes. Any person conducting testing under this section shall forward to the 

department within ten working days after the end of each month, a copy of each 

certificate of compliance issued during that month. Copies of each certificate of 

compliance shall be retained by the person issuing the certificate for at least two years 

from date of issuance. Alternative arrangements for providing and or storing this 

information using automated data storage devices may be approved or required by the 

department. 

 

Forms must be purchased from the department in advance of issuance through payment 

of fifteen or less dollars to the department for each certificate requested. Refunds or 

credit may be given for unused certificates returned to the department. 

Payment for fleet forms is waived for state and local government fleets. 

Test forms provided under this section are official documents. 

Persons receiving the forms from the department are accountable for each form provided. 

 

Voided forms must be handled the same as certificates of compliance. One copy shall be 

sent to the department within ten days after the end of the month in which the form was 

voided and one copy shall be retained by the person accountable for the forms for at least 

two years after date of voiding. Refunds will not be made for voided forms. 

(4) All persons authorized to conduct fleet or government vehicle inspections under this 

section shall be subject to performance audits and compliance inspections by the 

department, during normal business hours. 
Chapter173-422 WAC [ 17 ] Department of Ecology 

 (5) Fleet vehicles may be inspected any time between their scheduled license renewals. 

 (6) Certificates of acceptance may not be issued under this section. 

[Statutory Authority: RCW 70.120.080, 70.120.170 (4)(a), 46.16.015 (2)(h) and 70.120.120. 99-24-021 (Order 99-

19), § 173-422-160, filed 11/22/99, effective 12/31/99. Statutory Authority: Chapter 70.120 RCW. 95-06-068 

(Order 93-35), § 173-422-160, filed 2/28/95, effective 3/31/95; 94-05-039 (Order 93-10), § 173-422-160, filed 

2/8/94, effective 3/11/94; 93-10-062 (Order 91-46), § 173-422-160, filed 5/3/93, effective 6/3/93; 90-06-062, § 173-

422-160, filed 3/6/90, effective 4/6/90. Statutory Authority: RCW 70.120.120, 43.21A.080, 70.94.331 and 

70.94.141(1). 83-23-115 (Order DE 83-31), § 173-422-160, filed 11/23/83, effective 1/2/84. Statutory Authority: 

RCW 70.120.120. 82-02-027 (Order DE 81-32), § 173-422-160, filed 12/31/81; 80-03-070 (Order DE 79-35), § 

173-422-160, filed 2/28/80.] 

WAC 173-422-170 

Exemptions. 

The following motor vehicles are exempt from the inspection requirement: 

 (1) Vehicles proportionally registered pursuant to chapter 46.85 RCW. 

(2) New motor vehicles whose equitable or legal title has never been transferred to a 

person who in good faith purchases the vehicle for purposes other than resale; this does 

not exempt motor vehicles that are or have been leased. 

 (3) Motor vehicles that use propulsion units powered exclusively by electricity. 

 (4) Motor-driven cycles as defined in chapter 46.04 RCW as amended. 

 (5) Farm vehicles as defined in chapter 46.04 RCW as amended. 

 (6) Vehicles not required to be licensed. 

 (7) Mopeds as defined in chapter 46.04 RCW as amended. 

 (8) Vehicles garaged and operated out of the emission contributing area. 

 (9) Vehicles registered with the state but not for highway use. 

 (10) Used vehicles at the time of sale by a Washington licensed motor vehicle dealer. 

(11) Motor vehicles fueled by propane, compressed natural gas, or liquid petroleum gas 

and so registered by the department of licensing. 

(12) Motor vehicles whose manufacturer or engine manufacturer provides information 

that the vehicle cannot meet emission standards because of its design. In lieu of 

exempting these vehicles, alternative standards and or inspection procedures may be 

established. 
Chapter173-422 WAC [ 18 ] Department of Ecology 

(13) Motor vehicles whose registered ownership is being transferred between parents, 

siblings, grandparents, grandchildren, spouse or present co-owners and all transfers to the 

legal owner or a public agency. 

 (14) Vehicles less than five years old. 

 (15) Vehicles more than twenty-five years old. 

[Statutory Authority: RCW 70.120.120. 00-22-120 (Order 00-15), § 173-422-170, filed 11/1/00, effective 12/2/00. 

Statutory Authority: RCW 70.120.080, 70.120.170 (4)(a), 46.16.015 (2)(h) and 70.120.120. 99-24-021 (Order 99-

19), § 173-422-170, filed 11/22/99, effective 12/31/99. Statutory Authority: Chapter 70.120 RCW. 96-23-030 

(Order 96-11), § 173-422-170, filed 11/15/96, effective 12/16/96; 96-21-029 (Order 95-11), § 173-422-170, filed 

10/9/96, effective 11/9/96; 95-06-068 (Order 93-35), § 173-422-170, filed 2/28/95, effective 3/31/95; 94-05-039 

(Order 93-10), § 173-422-170, filed 2/8/94, effective 3/11/94; 93-10-062 (Order 91-46), § 173-422-170, filed 5/3/93, 

effective 6/3/93; 90-06-062, § 173-422-170, filed 3/6/90, effective 4/6/90. Statutory Authority: RCW 70.120.120, 

43.21A.080, 70.94.331 and 70.94.141(1). 83-23-115 (Order DE 83-31), § 173-422-170, filed 11/23/83, effective 

1/2/84. Statutory Authority: RCW 70.120.120. 82-02-027 (Order DE 81-32), § 173-422-170, filed 12/31/81; 80-

03-070 (Order DE 79-35), § 173-422-170, filed 2/28/80.] 

WAC 173-422-175 

Fraudulent exemptions. 

(1) Obtaining or attempting to obtain an exemption from emission inspection 

requirements by false statements, or failure to comply with the exemption procedures 

established to implement WAC 173-422-170, shall be construed as a violation of these 

rules implementing chapter 70.94 RCW as supplemented by chapter 70.120 RCW. 

(2) Any person who commits such violation or who aids or abets another in committing 

the same shall be subject to a civil penalty not to exceed two hundred fifty dollars for 

each violation. 

(3) Any civil penalty imposed by the department hereunder shall be appealable to the 

pollution control board as provided for in chapter 43.21B RCW. 

[Statutory Authority: RCW 70.120.120, 43.21A.080, 70.94.331 and 70.94.141(1). 83-23-115 (Order DE 83-31), § 

173-422-175, filed 11/23/83, effective 1/2/84.] 

WAC 173-422-190 

Emission specialist authorization. 

 (1) To become an authorized emission specialist an individual shall: 

 (a) Pass a course of study, approved by the department; and 

(b) Agree in writing to meet the requirements of subsection (2) of this section and 

all requirements of law or regulation regarding the serving of motor vehicle 

emission control systems or the motor vehicle emission inspection program. 
Chapter173-422 WAC [ 19 ] Department of Ecology 

 (2) To maintain certification, an authorized emission specialist shall: 

(a) Successfully complete a department-approved course on emission repair 

within ninety days of being required to do so by the department unless an 

extension has been granted in writing by the department; and 

(b) Sign, including the specialist identification number, all receipts and other 

forms required by the department for emission repairs or adjustments performed. 

These receipts must be prenumbered, preprinted with the business's name and 

address and clearly itemize all appropriate repairs performed by the specialist; and 

 (c) Record on all receipts: 

 (i) The vehicle's emission readings after appropriate repairs; and 

(ii) A vehicle description including the license number and vehicle 

identification number (VIN); and 

(iii) Any missing or inoperative primary emission control components; 

and 

 (iv) Any further recommended appropriate repairs; and 

(d) Not tamper with emission control systems, including adjusting an engine 

outside of the manufacturer's specifications (chapter 173-421 WAC); and 

(e) Not obtain or attempt to obtain a certificate of compliance, a certificate of 

acceptance (repair waiver) or an exemption from the inspection requirements by 

providing false information or by any fraudulent means (chapter 173-422 WAC); 

and 

(f) Not aid or abet any individual in committing a violation of chapter 173-421 or 

173-422 WAC. 

(3) The certification of an authorized emission specialist may be revoked for a first 

violation of chapter 173-421 WAC or WAC 173-422-145, for a period of no more than 

one year, and may be permanently revoked for a second violation of chapter 173-421 or 

173-422 WAC. 

 

The certification of an authorized emission specialist may be temporarily revoked for 

violation of subsection (2) of this section and may be permanently revoked for continued 

willful violation of subsection (2) of this section. 

 

An authorized emission specialist whose certification is revoked permanently or 

temporarily may appeal to the pollution control hearings board as provided for in RCW 

43.21B.310. 

 
Chapter173-422 WAC [ 20 ] Department of Ecology 

(4) An authorized emission specialist whose certification has been temporarily revoked 

may reapply for certification twelve months after the date of revocation by applying to 

the department and meeting all requirements of subsection (1) of this section. An 

application for certification by a permanently revoked authorized emission specialist will 

be denied. 

[Statutory Authority: Chapter 70.120 RCW. 96-21-029 (Order 95-11), § 173-422-190, filed 10/9/96, effective 

11/9/96; 95-06-068 (Order 93-35), § 173-422-190, filed 2/28/95, effective 3/31/95; 90-06-062, § 173-422-190, filed 

3/6/90, effective 4/6/90.] 

WAC 173-422-195 

Listing of authorized emission specialists. 

(1) A list of authorized emission specialists will be available to the public. Specialists 

will be listed under one employer's business name when the business is approved for 

listing. The list will be updated by the department at least once every six months. 

 

(2) The employer's business name and address will be listed by the department, when the 

employer agrees in writing to: 

 

(a) Require the use of a properly maintained and correctly calibrated exhaust 

analyzer as a final check for emission repairs or adjustments; 

 

(b) Have all emission repairs or adjustments performed by an authorized emission 

specialist; 

 

(c) Require the authorized emission specialist to sign the customer's receipt for 

emission repairs or adjustments, and to record the vehicle's emission readings on 

the receipt after the work is completed; 

 

(d) Require that all employees not aid or abet any person to tamper with emission 

control systems, including adjusting a vehicle outside of the manufacturer's 

specifications (chapter 173-421 WAC); and 

 

(e) Require that all employees not aid or abet any person to obtain a fraudulent 

certificate of compliance, certificate of acceptance or an exemption from the 

inspection requirement (repair waiver) (chapter 173-422 WAC ). 

 

(f) Notify the department when an authorized emission specialist begins or ends 

employment. 

 

(3) An employer may be removed from the authorized emission specialist list for a first 

violation of chapter 173-421 or 173-422 WAC for a period of no more than one year and 

may be permanently removed after a second violation of chapter 173-421 or 173-422 

WAC. 

 
Chapter173-422 WAC [ 21 ] Department of Ecology 

An employer may be temporarily removed from the authorized emission specialist list 

when failing to comply with the requirements of subsection (2) of this section and may be 

permanently revoked for continued and willful violation of subsection (2) of this section. 

 

(4) An employer who has been temporarily removed from the authorized emission 

specialist list may reapply for listing twelve months after the date of removal from the 

listing by applying to the department and meeting all requirements of subsection (2) of 

this section. An application for listing from an employer permanently removed from the 

authorized emission specialist list will be denied. 

 

(5) An employer who is removed from an authorized emission specialist list or denied 

listing in an authorized emission specialist list may appeal to the pollution control 

hearings board as provided for in RCW 43.21B.310. 

 

(6) (a) An employer approved for listing may display the "state authorized emission 

specialist" sign available from the department. Any employer advertising or 

providing of information to the public based on the department's certification of 

an authorized emission specialist must be discontinued immediately when the 

employer no longer meets the requirements. 

 

(b) An employer violating (a) of this subsection shall be subject to a civil penalty 

not to exceed two hundred fifty dollars for each violation. 

 

(c) A civil penalty imposed by the department may be appealed to the pollution 

control hearings board as provided for in RCW 43.21B.310. 

[Statutory Authority: Chapter 70.120 RCW. 95-06-068 (Order 93-35), § 173-422-195, filed 2/28/95, effective 

3/31/95; 90-06-062, § 173-422-195, filed 3/6/90, effective 4/6/90.] 

Disposition of sections formerly codified in this chapter 

173-422-080 Vehicle inspection data handling procedures. [Statutory Authority: RCW 70.120.120, 

43.21A.080, 70.94.331 and 70.94.141(1). 83-23-115 (Order DE 83-31), § 173-422-080, filed 

11/23/83, effective 1/2/84. Statutory Authority: RCW 70.120.120. 82-02-027 (Order DE-81-32), § 

173-422-080, filed 12/31/81; 80-03-070 (Order DE 79-35), § 173-422-080, filed 

2/28/80.] Repealed by 93-10-062 (Order 91-46), filed 5/3/93, effective 6/3/93. Statutory 

Authority: Chapter 70.120 RCW. 

173-422-110 Date system requirements. [Statutory Authority: RCW 70.120.120. 82-02-027 (Order DE 

81-32), § 173-422-110, filed 12/31/81; 80-03-070 (Order DE 79-35), § 173-422-110, filed 

2/28/80.] Repealed by 93-10-062 (Order 91-46), filed 5/3/93, effective 6/3/93. Statutory 

Authority: Chapter 70.120 RCW. 

173-422-140 Inspection forms and certificates. [Statutory Authority: Chapter 70.120 RCW. 93-10-062 

(Order 91-46), § 173-422-140, filed 5/3/93, effective 6/3/93; 90-06-062, § 173-422-140, filed 

3/6/90, effective 4/6/90. Statutory Authority: RCW 70.120.120, 43.21A.080, 70.94.331 and 

70.94.141(1). 83-23-115 (Order DE 83-31), § 173-422-140, filed 11/23/83, effective 1/2/84. 
Chapter173-422 WAC [ 22 ] Department of Ecology 

Statutory Authority: RCW 70.120.120. 82-02-027 (Order DE 81-32), § 173-422-140, filed 

12/31/81; 80-03-070 (Order DE 79-35), § 173-422-140, filed 2/28/80.] Repealed by 94-05-039 

(Order 93-10), filed 2/8/94, effective 3/11/94. Statutory Authority: Chapter 70.120 RCW. 

173-422-150 Inspection personnel requirements. [Statutory Authority: RCW 70.120.120. 80-03-070 

(Order DE 79-35), § 173-422-150, filed 2/28/80.] Repealed by 93-10-062 (Order 91-46), filed 

5/3/93, effective 6/3/93. Statutory Authority: Chapter 70.120 RCW. 

173-422-180 Air quality standards. [Statutory Authority: RCW 70.120.120. 80-03-070 (Order DE 79-35), § 

173-422-180, filed 2/28/80.] Repealed by 93-10-062 (Order 91-46), filed 5/3/93, effective 6/3/93. 

Statutory Authority: Chapter 70.120 RCW.