Learn the Issues
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Final Technical Support Documents for Area Designations Round 4
Final TSDs supporting the agency's final round four of area designations for the 2010 SO2 NAAQS
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SO2 Designations - Round 1 Illinois State Recommendation and EPA Response
SO2 Designations - State Recommendations and EPA Responses - Round 1 - Illinois
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Final Technical Support Documents for Area Designations Round 3
Final TSDs supporting the agency's final round three of area designations for the 2010 SO2 NAAQS
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National Rivers and Streams Assessment 2008-2009 Results
Results from the 2008-2009 National Rivers and Streams Assessment
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Deviation from 40 CFR §35.3520(e)(1) for Beaver Creek Dam Rehabilitation Project for the City of Martinsville, Virginia (2020)
This deviation would allow the state of Virginia to use DWSRF financing for the Beaver Creek Dam Rehabilitation Project to meet the current drinking water and public health needs of Martinsville, VA.
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AIS Waiver Request for 4” and 6” Stainless Steel Gate Valves for the City of Stuart, Florida
Waiver Request for 4” and 6” Stainless Steel Gate Valves for the City of Stuart, Stuart, Florida
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EPA Comments on the SF Bay Delta Water Quality Control Plan
EPA comments regarding proposed modifications to water quality standards in the Sacramento-San Joaquin Delta.
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Three Party Memorandum of Understanding on Pesticide Episodic Reporting, Investigation, and Enforcement in the State of California
Agreement between EPA, Cal. Dept. of Pesticide Regulation, and Cal. Agricultural Commissioners and Sealers Association, to ensure unified and coordinated program of pesticide episodic reporting, investigation, and enforcement action in the California.
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Final Report: California Counties Priority Pesticide Exposure Episode Audit
Final report of EPA Region 9's in-depth review of California’s County Agriculture Agricultural Commissioner (CAC) offices’ most significant investigations involving pesticide exposure of farmworkers and community members.
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State Water Facts
Learn more about water in states - how it's used and how WaterSense partners are helping to save it.
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Technical Specifications
WaterSense has specifications for water-efficient products and water-efficient homes.
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2016 WaterSense Awards Gallery
This gallery highlights the winners of the 2016 WaterSense Partner of the Year Awards.
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NPDES Stormwater Program in Region 10
EPA's stormwater program for Alaska, Idaho, Oregon, and Washington (Region 10).
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Indicators: Enterococci
Enterococci are bacteria that live in the intestinal tracts of warm-blooded animals, including humans, and therefore indicate possible contamination of streams and rivers by fecal waste.
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Response, Assessment, and Evaluation Services (RAES) Employment and Training Quarterly Reports
Response, Assessment, and Evaluation Services (RAES) Employment and Training Quarterly Reports submitted by Tetra Tech Inc. to EPA Region 9. USEPA Contract No. EP-S9-17-03.
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Indicators: Water Clarity
Water clarity is a measure of how clear water is, and more specifically, how far down light can penetrate through the water column.
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Indicators: Shallow Water Habitat/In-stream Fish Habitat
Shallow water habitat, also referred to as in-stream fish habitat, refers to areas that fish and other aquatic organisms need for concealment, breeding and feeding. This includes large woody snags, boulders, rock ledges, and undercut banks.
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Indicators: Streambed Fine Sediments
Streambed sediments are fine mineral deposits and silt located on the streambed. In excess amounts, they can fill in the habitat spaces between stream cobbles and rocks where aquatic organisms live and breed.
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2022v1 Emissions Modeling Platform Technical Support Document
This document describes how the emission inventories were prepared for air quality modeling by the U.S. Environmental Protection Agency (EPA) for criteria air pollutants to represent the year of 2022.
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2022v2 Emissions Modeling Platform
Modeling files from the 2022v2 Emissions Modeling Platform