EPA-Approved Regulations for Maricopa County

EPA’s Pacific Southwest (Region 9) implements and enforces federal environmental laws in Arizona, California, Hawaii, Nevada, the Pacific Islands, and 148 Tribal Nations.

The following documents and tables contain EPA Approved Regulations for Maricopa County and are part of the Arizona State Implementation Plan (SIP). EPA's Pacific Southwest Office maintains these tables and will update them to reflect any changes the official tables codified in the Code of Federal Regulations. To find the status of SIP submittals, visit SIP Status Reports.

On this page:

Compiled Rules and Regulations, Guidance and Ordinances (pdfs)
EPA-Approved Maricopa County Air Pollution Control Regulations
EPA-Approved Maricopa County Documents Related to Applications for Dust Control Permits
EPA-Approved Ordinances Adopted by Maricopa County and Other Local Jurisdictions Within Maricopa County

Compiled Rules and Regulations, Guidance and Ordinances

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EPA Approved and Compiled Rules and Regulations: Maricopa County APCD (pdf) (17.78 MB, January 2025)
EPA approved and compiled rules and regulations of the Maricopa County portion of the Arizona State Implementation Plan (SIP).
Application for Dust Control Permit (Maricopa County) (pdf) (124.33 KB, September 2017)
Relates to Rule 310 ("Fugitive Dust from Dust-Generating Operations"). Element of the Revised PM-10 State Implementation Plan for the Salt River Area, Additional Materials, September 2005. Submitted on November 29, 2005.
Guidance for Application for Dust Control Permit (pdf) (256.16 KB, September 2017)
Relates to Rule 310 ("Fugitive Dust from Dust-Generating Operations"). Element of the Revised PM-10 State Implementation Plan for the Salt River Area, Additional Materials, September 2005. Submitted on November 29, 2005.
Maricopa County Ordinance P-26 (pdf) (145.89 KB, October 23, 2019)
Maricopa County Residential Woodburning Restriction Ordinance P-26.
City of Mesa Ordinance No. 3434 (pdf) (1.42 MB, February 2, 1998)
An Ordinance of the City Council of the City of Mesa, Maricopa County, Arizona, Relating to Fireplace Restrictions Amending Title 4, Chapter 1, Section 2 Establishing a Delayed Effective Date; and Providing Penalties for Violations.
City of Phoenix Ordinance No. G4037 (pdf) (1.53 MB, July 2, 1997)
An Ordinance Amending Chapter 39, Article 2, Section 39-7 of the Phoenix City Code by Adding Subsection G Relating to Dust Free Parking Areas; and Amending Chapter 36, Article XI, Division I, Section 36-145 of the Phoenix City Code Relating to Parking on Non-Dust Free Lots.
City of Phoenix Ordinance No. G4062 (pdf) (1.31 MB, December 10, 1997)
An Ordinance Amending the Phoenix City Code By Adding A New Chapter 40 “Environmental Protections,” By Regulating Fireplaces, Wood Stoves and Other Solid-Fuel Burning Devices and Providing that the Provisions of this Ordinance Shall Take Effect on December 31, 1998.
City of Tolleson Ordinance No. 376, N.S. (pdf) (1018.02 KB, December 8, 1998)
An Ordinance of the City of Tolleson, Maricopa County, Arizona, Amending Chapter 7 of the Tolleson City Code by Adding a New Section 7-9, Prohibiting the Installation or Construction of a Fireplace or Wood Stove Unless It Meets the Standards Set Forth Herein (including Exhibit A).
Maricopa County Ordinance P-7 (pdf) (3.08 MB, May 26, 1994)
Maricopa County Trip Reduction Ordinance No. P-7.
Town of Carefree Ordinance No. 98-14 (pdf) (1.25 MB, September 3, 1998)
An Ordinance of the Town of Carefree, Maricopa County, Arizona, Adding Section 10-4 to the Town Code Relating to Clean-Burning Fireplaces, Providing Penalties for Violations.
Town of Gilbert Ordinance 1066 (pdf) (2.57 MB, November 25, 1997)
An Ordinance of the Common Council of the Town of Gilbert, Arizona Amending the Code of Gilbert by Amending Chapter 30 Environment, by adding New Article II Fireplace Restrictions Prescribing Standards for Fireplaces, Woodstoves, and Other Solid-Fuel Burning Devices in New Construction; Providing for an Effective Date of January 1, 1999; Providing for Repeal of Conflicting Ordinances; Providing for Severability.
Town of Paradise Valley Ordinance Number 450 (pdf) (1.29 MB, December 18, 1997)
An Ordinance of the Town of Paradise Valley, Arizona, Adding Section 5-1-7 to the Town Code Relating to Clean-Burning Fireplaces, Providing Penalties for Violations.
Town of Paradise Valley Ordinance Number 454 (pdf) (2.51 MB, January 22, 1998)
An Ordinance of the Town of Paradise Valley, Arizona, Relating to Grading and Dust Control, Amending Article 5-13 of the Town Code and Sections 5-13-1 Through 5-13-5, Providing Penalties for Violations and Severability.

EPA-Approved Maricopa County Air Pollution Control Regulations

Regulation I - General Provisions

County Citation	Title/Subject	State Effective Date	EPA Approval Date	Additional Explanation
Rule 100	General Provisions and Definitions	August 9, 2023	April 4, 2024, 89 FR 23521	Submitted on August 23, 2023

Regulation II - Permits and Fees

County Citation	Title/Subject	State Effective Date	EPA Approval Date	Additional Explanation
Rule 200	Permit Requirements	December 11, 2019	February 15, 2022, 87 FR 8418	Submitted on December 20, 2019.
Rule 210	Title V Permit Provisions	December 11, 2019	February 15, 2022, 87 FR 8418	Submitted on December 20, 2019.
Rule 220	Non-Title V Permit Provisions	December 11, 2019	February 15, 2022, 87 FR 8418	Submitted on December 20, 2019.
Rule 240 (except Section 304.4.e.(1))	Federal Major New Source Review (NSR)	December 11, 2019	February 15, 2022, 87 FR 8418	Submitted on December 20, 2019.
Rule 241	Minor New Source Review (NSR)	December 11, 2019	February 15, 2022, 87 FR 8418	Submitted on December 20, 2019.
Rule 242	Emissions Offsets Generated by the Voluntary Paving of Unpaved Roads	June 20, 2007	August 6, 2007, 72 FR 43538	Submitted on July 5, 2007.

Regulation III - Control of Air Contaminants

County Citation	Title/Subject	State Effective Date	EPA Approval Date	Additional Explanation
Rule 300	Visible Emissions	March 12, 2008	July 28, 2010, 75 FR 44141	Submitted on July 10, 2008.
Rule 310	Fugitive Dust From Dust-Generating Operations	January 27, 2010	December 15, 2010, 75 FR 78167	Submitted on April 12, 2010. Cites appendices C and F, which are listed separately in this table.
Rule 310.01	Fugitive Dust from Non-Traditional Sources of Fugitive Dust	January 27, 2010	December 15, 2010, 75 FR 78167	Submitted on April 12, 2010. Cites appendix C, which is listed separately in this table.
Rule 311	Particulate matter from process industries	August 2, 1993	April 10, 1995, 60 FR 18010. Vacated by Ober decision. Restored August 4, 1997, 62 FR 41856	Submitted on March 3, 1994.
Rule 312	Abrasive Blasting	July 13, 1988	January 4, 2001, 66 FR 730	Submitted on January 4, 1990.
Rule 313	Incinerators, Burn-Off Ovens, and Crematories	December 11, 2024	December 11, 2025, 90 FR 57370	Submitted on December 23, 2024
Rule 314	Open Outdoor Fires and Indoor Fireplaces at Commercial and Institutional Establishments	October 23, 2019	April 14, 2022,87 FR 22135	Submitted November 20, 2019
Rule 316	Nonmetallic Mineral Processing	November 7, 2018	7/15/2020, 85 FR 42726	Submitted on November 19, 2018.
Rule 318	Approval of Residential Woodburning Devices	April 21, 1999	November 8, 1999, 64 FR 60678	Submitted on August 4, 1999.
Rule 320, Section 306	Odors and Gaseous Air Contaminants, Limitation-Sulfur from Other Industries	July 2, 2003	August 20, 2024, 89 FR 67301	Submitted on November 13, 2023.
Rule 320, Section 307	Odors and Gaseous Air Contaminants, Operating Requirements-Asphalt Kettles and Dip Tanks	July 2, 2003	August 20, 2024, 89 FR 67301	Submitted on November 13, 2023.
Rule 322	Power Plant Operations	June 23, 2021	December 30, 2022, 87 FR 80462	Submitted on June 30, 2021, under an attached letter dated June 24, 2021.
Rule 323	Fuel Burning Equipment from Industrial/Commercial/Institutional (ICI) Sources	June 23, 2021	February 7, 2023, 88 FR 7879	Submitted on June 30, 2021, under an attached letter dated June 24, 2021.
Rule 324	Stationary Reciprocating Internal Combustion Engines (RICE)	June 23, 2021	February 7, 2023, 88 FR 7879	Submitted on June 30, 2021, under an attached letter dated June 24, 2021.
Rule 331	Solvent Cleaning	September 25, 2024	December 11, 2025, 90 FR 57370	Submitted electronically on October 3, 2024, as an attachment to a letter dated October 1, 2024. The September 25, 2024 version of Rule 331 replaces the April 21, 2004 version that was approved on December 21, 2004 (69 FR 76417).
Rule 333	Petroleum Solvent Dry Cleaning	June 19, 1996	February 9, 1998, 63 FR 6489	Submitted on February 26, 1997.
Rule 335 (v. 2013)	Architectural Coatings	September 25, 2013	December 11, 2025, 90 FR 57370	Submitted electronically on September 8, 2017.
Rule 335 (v. 2024)	Architectural Coatings	December 11, 2024	December 11, 2025, 90 FR 57370	Submitted electronically on December 23, 2024. The VOC content limits in table 335-1 of Rule 335 will only become applicable upon a determination by the EPA that either the Phoenix-Mesa nonattainment area failed to attain the 2015 ozone NAAQS by the attainment date or failed to make reasonable further progress. Until such time, the requirements in the September 25, 2013 version of Rule 335 remain applicable.
Rule 336	Surface Coating Operations and Industrial Adhesive Application Processes	September 1, 2021	January 16, 2025 90 FR 4652	Submitted electronically on September 17, 2021, as an attachment to a letter dated September 17, 2021. The September 1, 2021 version of Rule 336 replaces the November 2, 2016 version that was conditionally approved on January 7, 2021.
Rule 337	Graphic Arts	August 17, 2011	August 27, 2019 84 FR 44701	Submitted on January 15, 2014.
Rule 338	Semiconductor Manufacturing	June 19, 1996	February 9, 1998 63 FR 6489	Submitted on February 26, 1997.
Rule 341	Metal Casting	August 5, 1994	February 12, 1996 61 FR 5287	Submitted on August 16, 1994.
Rule 342	Coating Wood Furniture and Fixtures	November 2, 2016	August 27, 2019 84 FR 44701	Submitted on June 22, 2017.
Rule 343	Commercial Bread Bakeries	February 15, 1995	March 17, 1997 62 FR 12544	Submitted on August 31, 1995.
Rule 344	Automobile Windshield Washer Fluid	April 7, 1999	November 30, 2001 66 FR 59699	Submitted on August 4, 1999.
Rule 346	Coating Wood Millwork	November 20, 1996	February 9, 1998 63 FR 6489	Submitted on March 4, 1997.
Rule 347	Ferrous Sand Casting	March 4, 1998	June 12, 2000 65 FR 36788	Submitted on August 4, 1999.
Rule 348	Aerospace Manufacturing and Rework Operations	April 7, 1999	September 20, 1999 64 FR 50759	Submitted on August 4, 1999.
Rule 349	Pharmaceutical, Cosmetic, and Vitamin Manufacturing Operations	April 7, 1999	June 8, 2001 66 FR 30815	Submitted on August 4, 1999.
Rule 350	Storage and Transfer of Organic Liquids (Non-Gasoline) at an Organic Liquid Distribution (OLD) Facility	November 18, 2020	December 9, 2024 89 FR 97543	Submitted electronically on December 3, 2020, as an attachment to a letter dated November 24, 2020.
Rule 351	Storage and Loading of Gasoline at Bulk Gasoline Plants and at Bulk Gasoline Terminals	November 18, 2020	December 9, 2024 89 FR 97543	Submitted electronically on December 3, 2020, as an attachment to a letter dated November 24, 2020.
Rule 352	Gasoline Cargo Tank Testing and Use	November 18, 2020	January 10, 2025 90 FR 1903	Submitted electronically on December 3, 2020, as an attachment to a letter dated November 24, 2020.
Rule 353	Storage and Loading at Gasoline Dispensing Facilities	November 18, 2020	January 10, 2025 90 FR 1903	Submitted electronically on December 3, 2020, as an attachment to a letter dated November 24, 2020.
Rule 358	Polystyrene Foam Operations	April 20, 2005	May 26, 2005 70 FR 30370	Submitted on April 25, 2005.

Regulation V - Air Quality Standards and Area Classification

County Citation	Title/Subject	State Effective Date	EPA Approval Date	Additional Explanation
Rule 510	Air Quality Standards	December 11, 2019	10/4/2021 86 FR 54628	The December 11, 2019 version of Rule 510 replaces the version that was adopted on November 1, 2006 (74 FR 57612).

Regulation VI - Emergency Episodes

County Citation	Title/Subject	State Effective Date	EPA Approval Date	Additional Explanation
Rule 600	Emergency Episodes	July 13, 1988	March 18, 1999 64 FR 13351	Submitted on January 4, 1990.

Appendices to Maricopa County Air Pollution Control Rules and Regulations

County Citation	Title/Subject	State Effective Date	EPA Approval Date	Additional Explanation
Appendix C	Fugitive Dust Test Methods	March 26, 2008	December 15, 2010 75 FR 78167	Cited in Rules 310 and 310.01. Submitted on July 10, 2008.
Appendix F	Soil Designations	April 7, 2004	August 21, 2007 72 FR 46564	Cited in Rule 310. Submitted on October 7, 2005.

EPA-Approved Maricopa County Documents Related to Applications for Dust Control Permits

Title	State Effective Date	EPA Approval Date	Additional Explanation
Application for Dust Control Permit (pdf)	June 22, 2005	August 21, 2007, 72 FR 46564	Relates to Rule 310 (“Fugitive Dust from Dust-Generating Operations”). Element of the Revised PM-10 State Implementation Plan for the Salt River Area, Additional Materials, September 2005. Submitted on November 29, 2005.
Guidance for Application for Dust Control Permit (pdf)	June 22, 2005	August 21, 2007, 72 FR 46564	Relates to Rule 310 (“Fugitive Dust from Dust-Generating Operations”). Element of the Revised PM-10 State Implementation Plan for the Salt River Area, Additional Materials, September 2005. Submitted on November 29, 2005.

EPA-Approved Ordinances Adopted by Maricopa County and Other Local Jurisdictions Within Maricopa County

County Citation	Title/Subject	State Effective Date	EPA Approval Date	Additional Explanation
Maricopa County Ordinance P-26 (pdf)	Residential Woodburning Restriction Ordinance	October 23, 2019	April 14, 2022, 87-FR-22135	Submitted November 20, 2019
Maricopa County Ordinance P-7 (pdf)	Trip Reduction Ordinance	May 26, 1994	May 4, 1998, 63 FR 24434	Submitted on August 31, 1995.
Town of Carefree Ordinance No. 98-14 (pdf)	An Ordinance of the Town of Carefree, Maricopa County, Arizona, Adding Section 10-4 to the Town Code Relating to Clean-Burning Fireplaces, Providing Penalties for Violations (3 pages)	September 1, 1998	July 25, 2002, 67 FR 48718	Submitted on February 16, 2000.
Town of Gilbert Ordinance 1066 (pdf)	An Ordinance of the Common Council of the Town of Gilbert, Arizona Amending the Code of Gilbert by Amending Chapter 30 Environment, by adding New Article II Fireplace Restrictions Prescribing Standards for Fireplaces, Woodstoves, and Other Solid-Fuel Burning Devices in New Construction; Providing for an Effective Date of January 1, 1999; Providing for Repeal of Conflicting Ordinances; Providing for Severability (3 pages)	January 1, 1999	July 25, 2002, 67 FR 48718	Adopted by the Town of Gilbert on November 25, 1997. Submitted on February 16, 2000.
City of Mesa Ordinance No. 3434 (pdf)	An Ordinance of the City Council of the City of Mesa, Maricopa County, Arizona, Relating to Fireplace Restrictions Amending Title 4, Chapter 1, Section 2 Establishing a Delayed Effective Date; and Providing Penalties for Violations (3 pages)	December 31, 1998	July 25, 2002, 67 FR 48718	Adopted by the City of Mesa on February 2, 1998. Submitted on February 16, 2000.
Town of Paradise Valley Ordinance Number 450 (pdf)	An Ordinance of the Town of Paradise Valley, Arizona, Adding Section 5-1-7 to the Town Code Relating to Clean-Burning Fireplaces, Providing Penalties for Violations (3 pages)	December 18, 1997	July 25, 2002, 67 FR 48718	Adopted by the Town of Paradise Valley on December 18, 1997. Submitted on February 16, 2000.
Town of Paradise Valley Ordinance Number 454 (pdf)	An Ordinance of the Town of Paradise Valley, Arizona, Relating to Grading and Dust Control, Amending Article 5-13 of the Town Code and Sections 5-13-1 Through 5-13-5, Providing Penalties for Violations and Severability (6 pages)	January 22, 1998	July 25, 2002, 67 FR 48718	Adopted by the Town of Paradise Valley on January 22, 1998. Submitted on February 16, 2000. [Incorporation Note: There is an error in the ordinance's title, ordinance amended only sections 5-13-1 to 5-13-4; see section 1 of the ordinance.]
City of Phoenix Ordinance No. G4062 (pdf)	An Ordinance Amending the Phoenix City Code By Adding A New Chapter 40 “Environmental Protections,” By Regulating Fireplaces, Wood Stoves and Other Solid-Fuel Burning Devices and Providing that the Provisions of this Ordinance Shall Take Effect on December 31, 1998 (5 pages)	December 31, 1998	July 25, 2002, 67 FR 48718	Adopted by the City of Phoenix on December 10, 1997. Submitted on February 16, 2000.
City of Phoenix Ordinance No. G4037 (pdf)	An Ordinance Amending Chapter 39, Article 2, Section 39-7 of the Phoenix City Code by Adding Subsection G Relating to Dust Free Parking Areas; and Amending Chapter 36, Article XI, Division I, Section 36-145 of the Phoenix City Code Relating to Parking on Non-Dust Free Lots (5 pages)	July 2, 1997	July 25, 2002, 67 FR 48718	Adopted by the City of Phoenix on July 2, 1997. Submitted on February 16, 2000.
City of Tolleson Ordinance No. 376, N.S. (pdf)	An Ordinance of the City of Tolleson, Maricopa County, Arizona, Amending Chapter 7 of the Tolleson City Code by Adding a New Section 7-9, Prohibiting the Installation or Construction of a Fireplace or Wood Stove Unless It Meets the Standards Set Forth Herein (including Exhibit A, 4 pages)	December 8, 1998	July 25, 2002, 67 FR 48718	Adopted by the City of Tolleson on December 8, 1998. Submitted on February 16, 2000.