Laws & Regulations

Notice of Public Meetings Regarding “Waters of the United States”

Link to the pre-publication version of the Federal Register notice announcing public meetings on the intention to revise the definition of "waters of the United States."

Basic Information about Visibility

Visibility - Basic Information

Introduction to Visibility

Report by William Malm, National Park Service and Colorodo State Institute for Research on the Atmosphere

Slides for Webinar on the Draft Guidance Document for the Second Implementation Period of the Regional Haze Rule

Slides for Regional Haze Guidance Webinar

Regional Haze Guidance Technical Support Document and Data File

Technical Support Documents for RH Guidance

Texas SIP: 30 TAC 117.403: Exemptions, SIP effective April 22, 2026 (TXd253)

Texas SIP: 30 TAC 115.10

EPA-Approved Regulations in the Hawai'i SIP

EPA Approved Air Regulations in the Hawai'i State Implementation Plan (SIP).

Report: Whistleblower Protection Review

Report #2000-S-2, Jan 1, 2000. The March 23, 1999, letter from the National Whistleblower Center (NWC) to EPA’s Administrator stated that EPA has failed to inform its employees of their legal rights under the environmental whistleblower laws.

Report: Review of Region 5 Laboratory Operations

Report #2000-P-3, Jan 1, 2000. In September 1998, the Region 5 Quality Assurance Core initiated a Management Systems Review of the CRL to determine whether the lab’s quality management system was operating as designed.

Report: Review of Region 10's Maxiflex Program

Report #00-000039-2000-M-000006, Jan 19, 2000. The Region’s Maxiflex policies and procedures do not provide adequate documentation for financial reporting purposes.

Report: Improving Region 5's EnPPA/PPG Program

Report #2000-P-00008, February 29, 2000. Region 5's EnPPA/PPG program could benefit from improved communication.

Report: AUDIT OF EPA’S FISCAL 1999 FINANCIAL STATEMENTS

Report #00100231, February 29, 2000. The Agency was unable to provide support in a timely manner for the composition of Other Financing Sources for the Superfund Trust Fund and the Agency as a whole.

Report: Biosolids Management and Enforcement

Report #2000-P-10, March 20, 2000. EPA does not have an effective program for ensuring compliance with the land application requirements of Part 503.

Report: Audit of Extramural and Property Management at the Atlantic Ecology Division

Report #2000-P-00015, March 29, 2000. Since our 1993 audit, AED made limited progress in implementing the recommendations in our prior report to improve the management of contracts, cooperative agreements and interagency agreements.

Report: EPA’S Fiscal 1998 Working Capital Fund Financial Statements

March 29, 2000. We could not determine if EPA’s fiscal 1998 WCF financial statements are fairly presented.

Report: Tank Waste Remediation System (TWRS) Program for the Hanford Federal Facility

Report #WAD 99-000421-2000-P-00012, March 30, 2000. Ecology and the Region need to improve their oversight and enforcement of RCRA requirements that apply to Hanford’s TWRS Program.

Report: EPA Needs Better Integration of the National Environmental Performance Partnership System

Report #2000-M-000828-000011, March 31, 2000. Our work shows that NEPPS as well as PPGs have not been well-integrated into EPA and not all EPA managers and staff buy-into or accept the new performance partnership system.

Report: EPA’s Multimedia Enforcement Program

Report #2000-P-000018, June 30, 2000. Multimedia enforcement actions can result in significant environmental benefits.

Report: Memorandum of Review on EPA's Management of the Abex Superfund Site

Report #2000-S-00006, August 31, 2000. EPA officials stated that initial sampling was performed within a 700-foot radius of the Abex Foundry.

Report: Report of EPA’s Oversight of State Stack Testing Programs

Report #2000-P-00019, September 11, 2000. EPA guidance does not clearly address important issues such as how and what stack testing information should be reported.