Laws & Regulations
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Approval of Request for Coverage under General Air Quality Permit; Costco Fuel Facility, Location No. 1834, Scottsdale, AZ
Notification of Coverage under the Air Quality Permit by Rule for New or Modified True Minor Source Gasoline Dispensing Facilities in Indian Country: Costco Fuel Facility, Location No. 1834. Source ID # 134; Application # 2026-007-PBR. EPA-R09-OAR-2026-637
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Drinking Water Requirements for States and Public Water Systems
Access information on implementing drinking water rules; as well as training materials and resources for small public water systems.
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Closure Letter for Administrative Complaint Nos. 03R-07-R9 and 11R-98-R9
On July 7, 2017, ECRCO issued a Closure Letter for Administrative Complaint Nos. 03R-07-R9 and 11R-98-R9, involving the Arizona Department of Environmental Quality (ADEQ).
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Complaints Filed with EPA under Title VI of the Civil Rights Act of 1964: Case #01R-11-R6
These documents are related to case #01r-11-r6
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Final Closure Letter for Administrative Complaint Numbers 03R-07-R9, 10R-07-R9 and 01R-11R9
On 6-7-2017, ECRCO issued a closure letter for Admin Complaint Numbers 03r-07-r9, 10r-07-r9 and 01r-11-r9 involving the Maricopa County Air Quality Department regarding alleged complaints that MCAQD violated Title 6 of the Civil Rights Act of 1964.
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Performance Specification 4 for Carbon Monoxide
Performance Specification 4 - Specifications and Test Procedures For Carbon Monoxide Continuous Emission Monitoring Systems In Stationary Sources
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Performance Specification 4A for Carbon Monoxide
Performance Specification 4A - Specifications and Test Procedures For Carbon Monoxide Continuous Emission Monitoring Systems In Stationary Sources
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Method 204 - Permanent (PTE) or Temporary Total Enclosure (TTE) for Determining Capture Efficiency
Promulgated CFR Test Method 204 Criteria for and Verification of a Permanent or Temporary Total Enclosure.
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Performance Specification 9 for Gas Chromatographic Continuous Emission Monitoring System
Performance Specification 9 - Specifications and Test Procedures for Gas Chromatographic Continuous Emission Monitoring System in Stationary Sources
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Method 326 Determination of Isocyanates in Stationary Source Emissions
Determination of Isocyanates in Stationary Source Emissions
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EMC Technical Information Documents
EMC Information Documents explain the derivation of factors, equations, and procedures, and provide technical information.
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MOVES and Mobile Source Emissions Research
MOVES is a state-of-the-science emission modeling system that estimates emissions for mobile sources at the national, county, and project level for criteria air pollutants, greenhouse gases, and air toxics.
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Timeline of Carbon Monoxide (CO) National Ambient Air Quality Standards (NAAQS)
See the history of limits to the level of carbon monoxide (CO) in ambient air, set through the NAAQS review and rulemaking process under the Clean Air Act. This includes both primary and secondary standards.
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Timeline of Sulfur Dioxide NAAQS
See the history of limits to the level of sulfur dioxide (SO2) in ambient air, set through the NAAQS review and rulemaking process under the Clean Air Act. This includes both primary and secondary standards.
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Timeline of Nitrogen Dioxide (NO2) National Ambient Air Quality Standards (NAAQS)
See the history of limits to the level of nitrogen dioxide (NO2) in ambient air, set through the NAAQS review and rulemaking process under the Clean Air Act. This includes both primary and secondary standards.
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Timeline of Lead (Pb) National Ambient Air Quality Standards (NAAQS)
The table includes FR citations for each revision to standards, and acceptable lead levels in air (micrograms per cubic meter).
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Particulate Matter (PM) Air Quality Standards - Documents Prior to Review Completed in 1997
Particulate Matter (PM) Air Quality Standards - Documents Prior to Review Completed in 1997
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MP0020371: Managaha Island WWTP, Managaha Island, MP
NPDES Permit No. MP0020371 for CTasi Tours and Transportation, Inc., Managaha Island Wastewater Treatment Plant.
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How to Report Spills and Environmental Violations
Where to report spills of toxic materials and violations of environmental laws or regulations.