CALIFORNIA AIR RESOURCES BOARD

APCD/AQMD RULE EVALUATION FORM -- Page 1

(Electronic Format)

I. GENERAL INFORMATION

District: Placer County Air Pollution Control District

Rule No(s): 247 Date adopted/Amended/Rescinded: February 13, 2014

Rule Title(s): NATURAL GAS-FIRED WATER HEATERS, SMALL BOILERS AND 

PROCESS HEATERS 

Date Submitted to ARB: March 24, 2014

If an Amended Rule, Date Last Amended (or Adopted): October 10, 2013

Is the Rule Intended to be Sent to the U.S. EPA as a SIP Revision? Yes No (If No, do not complete remainder of form)

District Contact: John Finnell Phone Number: 530-745-2324 E-mail Address: jfinnell@placer.ca.gov

Narrative Summary of New Rule or Rule Changes: New Rule Amended Rule

This rule was first adopted in October, 2013. It was amended on February 13, 2014 to improve the labelling 

requirements.

The District had a commitment in the 8-hour Ozone State Implementation Plan (SIP) to adopt a new rule to 

regulate oxides of nitrogen (NOx) emissions for all natural gas fired large water heaters and small boilers with 

rated input sizes in the range of 75,000 up to 1,000,000 Btu/hr by 2015. 

Prior to adoption of Rule 247, water heaters and boilers in this size range were unregulated. Smaller water 

heaters, less than 75,000 Btu/hr (residential water heaters), are regulated by Rule 246, Natural Gas-Fired Water 

Heaters. 

Rule 247 covers the entire unregulated size range from 75,000 Btu/hr up to less than 5 million Btu/hr and limits

NOx emissions to 20 ppmv @ 3% O2.

Pollutant(s) Regulated by the Rule (Check): ROG (NOx) SO2

(CO) PM TAC (name):

II. EFFECT ON EMISSIONS

Complete this section ONLY for rules that, when implemented, will result in quantifiable changes in emissions. Attach reference(s) for emission 

factor(s) and other information. Attach calculation sheet showing how the emission information provided below was determined.

Net Effect on Emissions: Increase Decrease N/A

Emission Reduction Commitment in SIP for this Source Category: .03

Inventory Year Used to Calculate Changes in Emissions: 2010 Area Affected: All of Placer County

Future Year Control Profile Estimate (Provide information on as many years as possible):

NOx reduction to be achieved by this control measure will be 1.01 tpd, developing linearly from 2010 until 2025.
CALIFORNIA AIR RESOURCES BOARD

APCD/AQMD RULE EVALUATION FORM -- Page 2

(Electronic Format)

Baseline Inventory in the SIP for the Control Measure: 2002

Emissions Reduction Commitment in the SIP for the Control Measure: 0.03 ton/day

Revised Baseline Inventory (if any): NA

Revised Emission Reduction Estimate (if developed): 1.01 ton/day

Note that the district’s input to the Rule Evaluation Form will not be used as input to the ARB’s emission forecasting and 

planning.

III. SOURCES/ATTAINMENT STATUS

District is: Attainment Nonattainment Split

Approximate Total Number of Small (<100 TPY) Sources Affected by this Amendment: 97

Percent in Nonattainment Area: 75%

Number of Large (> 100 TPY) Sources Controlled: 0 Percent in Nonattainment Area: 0%

Name(s) and Location(s) (city and county) of Large (> 100 TPY) Sources Controlled by Rule (Attach additional sheets as 

necessary): NA

IV. EMISSION REDUCTION TECHNOLOGY

Does the Rule Include Emission Limits that are Continuous? Yes No

If Yes, Those Limits are in Section(s) 301, Nitrogen Oxides Emission Limit of the Rule.

Other Methods in the Rule for Achieving Emission Reductions are: NA

V. OTHER REQUIREMENTS

The Rule Contains:

Emission Limits in Section(s): 301, Nitrogen Oxides Emission Limit Work Practice Standards in Section(s): NA

Recordkeeping Requirements in Section(s): 501, Recordkeeping Reporting Requirements in Section(s): NA
CALIFORNIA AIR RESOURCES BOARD

APCD/AQMD RULE EVALUATION FORM -- Page 3

(Electronic Format)

5/1/2002

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VI. IMPACT ON AIR QUALITY PLAN

 No Impact Impacts RFP Impacts attainment

Discussion: Adoption of Rule 247 will achieve much greater NOx reductions than the Districts SIP commitment for a boiler

control measure. The SIP commitment is 0.03 tpd while Rule 247 is expected to achieve 1.01 tpd in NOx emission 

reductions.