Frequent Questions

Is there a list of EPA's Priority Pollutants?

The EPA list of Priority Pollutants is available through the Code of Federal Regulations (CFR). The following index will point you to the correct sections of the CFR depending upon how the substance is regulated.

Browse the parts and sections of CFR's Title 40: Protection of the Environment

Navigation tip: The number listed before "CFR" is the title, the number listed after "CFR" is the part.

Air Toxics Lists
40 CFR 61.01 - List of Covered Pollutants (National Emission Standards for Hazardous Air Pollutants/NESHAPs) under CAA Section 112(b)
40 CFR 68.130 - List of Toxic and Flammable Substances Under CAA Section 112(r)

Extremely Hazardous Substances (EHS) List Under Emergency Planning and Community Right-to-Know Act (EPCRA) (SARA Section 302)
40 CFR 355, Appendix A (Alphabetical)
40 CFR 355, Appendix B (By CAS number)

Ground Water Lists
40 CFR 264.94, Table 1 - Hazardous Constituent Concentration Limits
40 CFR 264, Appendix IX - Ground Water Monitoring List

Hazardous Materials Table (Hazmat)
49 CFR 172.101, Table

Hazardous Substances List under Clean Water Act (CWA) Section 311
40 CFR 116.4 (Alphabetical and by CAS number)

National Priorities List (Superfund Sites)
40 CFR 300, Appendix B
Table 1 - General Superfund Section
Table 2 - Federal Facilities Section

New Source Performance Standards (NSPS)
40 CFR 60.16 - Prioritized List of Major Source Categories

Occupational Safety and Health Administration (OSHA) Air Contaminants Limits
29 CFR 1910.1000, Tables Z-1, Z-2, Z-3

Ozone-Depleting Substances (Controlled Substances)
40 CFR 82, Appendix A to Subpart A (Class I Controlled Substances)
40 CFR 82, Appendix B to Subpart A (Class II Controlled Substances)
40 CFR 82, Appendix F to Subpart A (Listing of Ozone-Depleting Chemicals)

Pollutants Under the Clean Water Act (CWA)
40 CFR 401.15, Toxic Pollutant List
40 CFR Part 423, Appendix A, Priority Pollutant List  

Resource Conservation and Recovery Act (RCRA) Hazardous Waste Lists
40 CFR 261.31 - Hazardous Wastes From Non-Specific Sources
40 CFR 261.32 - Hazardous Wastes From Specific Sources
40 CFR 261.33 - Discarded Commercial Chemical Products, Off-Specification Species, Container Residues, and Spill Residues Thereof (Acute and Toxic Wastes)
40 CFR 261, Appendix VIII - Hazardous Constituents List
40 CFR 261, Appendix IX, Table 1 - Wastes Excluded From Specific Sources

Reportable Quantities List (Hazardous Substances and Their RQs)
40 CFR 302.4

Reportable Quantities of Hazardous Substances Under CWA Section 311
40 CFR 117.3 (Table 117.3)

Toxic Chemical Emissions Inventory Under Emergency Planning and Community Right-to-Know Act (EPCRA) Section 313
40 CFR 372.65 (Alphabetical, by CAS number and chemical category)

Toxic Pollutants
40 CFR 129.4 - List of Pollutants Subject to National Pollutant Discharge Elimination System (NPDES) Permit Requirements
40 CFR 401.15 - List of Pollutants Under Clean Water Act (CWA) Section 307(a)(1)

Please note that the electronic CFR or "e-CFR" is an unofficial version of the CFR that gets updated at least weekly to include changes announced in the Federal Register. The official version only gets updated once a year and is available at Code of Federal Regulations (CFR) annual edition.

For directions to the listing of Hazardous Air Pollutants (HAP), please view this FAQ:
Where can I find National Emission Standards for Hazardous Air Pollutants (NESHAPs)?  Where is the list of hazardous air pollutants?

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