Collections and Lists

Nitrogen Dioxide Designations - Connecticut State Recommendation and EPA Response

2010 Nitrogen dioxide (NO2) standards. Connecticut state recommendation and EPA response.

Nitrogen Dioxide Designations - Massachusetts State Recommendation and EPA Response

2010 Nitrogen dioxide (NO2) standards. Massachusetts state recommendation and EPA response.

About the Study

Overview of Hydraulic Fracturing Water Cycle and Research Approaches.

2021 Tribal Water Quality Standards Academy

Final agenda and presentations from the 2021 EPA Region 9 Tribal Water Quality Standards Virtual Workshop.

2025 Tribal Clean Water Act (CWA) Workshop

Presentations from the EPA Region 9 & Fallon Paiute-Shoshone Tribe's 2025 Tribal Clean Water Act (CWA) Workshop. The workshop guided Tribal CWA staff on monitoring, assessment, protection, and pollution prevention on Tribal lands and watersheds.

Reference Library of Water Quality Standards Policy and Guidance Documents

This page contains an index of specific EPA documents related to water quality standards, including those referenced in the Water Quality Standards Handbook.

EPA-Approved South Coast Air District Regulations in the California SIP

EPA approved and compiled rules and regulations for the South Coast Air Quality Management District (AQMD) portion of the California State Implementation Plan (SIP).

Effective Funding Frameworks for Water Infrastructure

A collection of funding frameworks for water infrastructure.

RACT/BACT/LAER Clearinghouse (RBLC) Related Resources

RBLC Products include User's Manuals, Annual Reports, Data Input Form and the RBLC Standalone Editor (Software for off-line data entry).

Where Great Lakes Coastal Wetlands Occur

This provides background for where throughout the Great Lakes Basin the coastal wetlands are.

Nonpoint Source Success Stories: Virginia

Stories about primarily nonpoint source-impaired waterbodies in Virginia where restoration efforts have led to documented water quality improvements.

Buffalo River AOC 2014 RAP Update

The 2014 RAP update for the Buffalo River AOC.

2009 Annual Report: Black River AOC Remedial Action Plan

Remedial Action plan related documents to the Black River AOC

Guidance for Delisting Michigan’s Great Lakes Areas of Concern

A useful tool for guidance in delisting Michigan’s Areas of Concern. Technical staff in the Michigan Department of Environmental Quality (MDEQ), the Michigan Department of Natural Resources (MDNR), USEPA Great Lakes National Program Office, among others.