Science & Technology

RE: Request for Reconsideration of Request for Correction (RFC #10003) regarding EPA's Coal Combustion Products Partnerships Website

Letter response to the Public Employees for Environmental Responsibility (PEER) Request for Reconsideration (RFR #10003A).

Petition to Promulgate Reporting Rules for Mercury Manufacturing, Processing, and Importation

Section 21 petition to promulgate reporting rules for mercury manufacturing, processing, and importation under section 8(a) of the Toxic Substances Control Act.

RFC 17002

Re: Request for Correction 09001

Follow up letter on RFC 09001 on behalf of the Association of Battery Recyclers

Nutrients Management: External Reports

External reports from USGS, USDA, National Academy of Sciences, and NSTEPS on nutrient management.

Determining the Prevalence of Contaminants in Treated and Untreated Drinking Water

Scientists from EPA and the U.S. Geological Survey (USGS) are conducting a multi-phase study to determine the presence of contaminants of emerging concern in treated and untreated drinking water.

Scientists evaluate potential of mussels to detect microbial contamination of ambient water

Microbial contamination in lakes, rivers and oceans can cause illnesses to animals and humans who come in contact with the water.

System for Urban Stormwater Treatment and Analysis IntegratioN (SUSTAIN)

SUSTAIN is a decision support system that assists stormwater management professionals with developing and implementing plans for flow and pollution control measures to protect source waters and meet water quality goals.

Research to Support and Implement Recreational Water Quality Criteria (RWQC)

EPA's non-potable water reuse research.

Small Wastewater Systems Research

Small communities face barriers to building and maintaining effective wastewater treatment services, challenges include financial/economic limitations, lack of managerial training and geographic isolation/remoteness.

Mountaintop Mining Research

EPA research on mountaintop mining examines the impacts of mining on headwater streams and other water resources near mining sites

CMAQ Community

Learn about the many individuals and organizations that use and contribute to the CMAQ system. You can also view the results of our 2016 User Survey and read blog posts by CMAQ scientists.

EPA to hold public hearing on the City of Asheboro’s wastewater treatment plant proposed permit

Release Date: October 8, 2025

Report: EPA Needs to Strengthen Its Purchase Card Approval Process

Report #21-P-0242, September 22, 2021. The Agency needs to improve oversight of its approximately $25 million in annual purchase card and convenience check expenses to be better stewards of taxpayer dollars.

Report: Internal Quality Assurance Review of EPA OIG Audit Assignments Completed in Fiscal Year 2019

Report #20-N-0230, July 16, 2020. OIG audit reports issued in FY 2019 demonstrated high levels of compliance with OIG quality assurance procedures, receiving an average compliance score of 92 percent.

Report: EPA’s Fiscal Years 2020 and 2019 Hazardous Waste Electronic Manifest System Fund Financial Statements

Report #22-F-0015, December 29, 2021. We found the fund’s financial statements, except for accounts receivable and earned revenue, to be fairly presented.

Report: Fiscal Years 2017 and 2016 (Restated) Financial Statements for the Pesticides Reregistration and Expedited Processing Fund

Report #19-F-0214, June 28, 2019. We rendered a modified opinion on the EPA's FY 2017 FIFRA Fund financial statements and a disclaimer of opinion on the FY 2016 (restated) FIFRA Fund financial statements.