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Rule No(s): 246 Date adopted/Amended/Rescinded: June 19, 1997

Rule Title(s): Natural Gas-Fired Water Heaters

Date Submitted to ARB: 7/27/10

If an Amended Rule, Date Last Amended (or Adopted): N/A

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 

Rule 246 applies to natural gas-fired water heaters that are rated below 75,000 btu/hour input. The rule requires 

these heaters to meet a 40 nanograms per joule of heat output NOx emissions limit (50 nanograms for mobile 

home water heaters). The rule also requires manufacturer certification and labeling.

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: 23.7 tons/year

Inventory Year Used to Calculate Changes in Emissions: 1990 Area Affected: All areas of Placer County: 

Sacramento Valley, Mountain Counties, Lake Tahoe 

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

2005 Reductions: 23.7 tons/year Baseline: 65.7 tons/year Control Level: 36.1% Control Factor: 0.639
CALIFORNIA AIR RESOURCES BOARD 

APCD/AQMD RULE EVALUATION FORM -- Page 2

(Electronic Format) 

Baseline Inventory in the SIP for the Control Measure: 65.7 tons/year

Emissions Reduction Commitment in the SIP for the Control Measure: 23.7 tons/year

Revised Baseline Inventory (if any): N/A

Revised Emission Reduction Estimate (if developed): 23.7 tons/year

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: Unknown (area sources)

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) Section 301, Nitrogen Oxide Emission Limit of the Rule. 

Other Methods in the Rule for Achieving Emission Reductions are: N/A

V. OTHER REQUIREMENTS

The Rule Contains: 

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

Recordkeeping Requirements in Section(s): Section 501, Retention of Records Reporting Requirements in Section(s): 

N/A
CALIFORNIA AIR RESOURCES BOARD 

APCD/AQMD RULE EVALUATION FORM -- Page 3

(Electronic Format) 

5/1/2002 

3

VI. IMPACT ON AIR QUALITY PLAN

 No Impact Impacts RFP Impacts attainment 

Discussion: The rule was included as a NOx control measure in the Sacramento Area Regional Ozone Attainment Plan, 

which was adopted by the District Board on December 20, 1994. NOx emissions are precursors to the photochemical 

formation of Ozone. The Attainment Plan was adopted in response to the 1990 Amendments to the Federal Clean Air Act 

(CAA), which required areas designated “serious” for Ozone by the United States Environmental Protection Agency 

(USEPA), to submit a State Implementation Plan (SIP) revision.