Science & Technology

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

Student Curriculum Downloads

Downloads for the student curriculum.

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.

Report: EPA Needs to Improve Oversight of the Senior Environmental Employment Program

Report #19-P-0198, June 24, 2019. The SEE program can reduce the risk of fraud, waste and abuse and make the program more efficient through additional controls.

"Response Signatures" Indicate Pollution Sources in Ohio

Case Studies: Using bioassessments and biocriteria to identify impaired waters and causes of impairment

Field Branches Quality System and Technical Procedures for Pump Operation

Field Branches Quality System and Technical Procedures

Report: EPA Region 6 Quickly Assessed Water Infrastructure after Hurricane Harvey but Can Improve Emergency Outreach to Disadvantaged Communities

Report #19-P-0236, July 16, 2019. Enhancements to environmental justice outreach efforts during emergencies could improve the public health protections of communities impacted by hurricanes or other disasters.

Report: Further Efforts Needed to Uphold Scientific Integrity Policy at EPA

Report #20-P-0173, May 20, 2020. Improving implementation of the SI Policy will enable the EPA to more effectively carry out its mission to protect human health and the environment.

Report: Management Alert: EPA Region 5 Needs to Implement Effective Internal Controls to Strengthen Its Records Management Program

Report #20-E-0247, August 31, 2020. Federal law requires agency heads to establish and maintain a records program that includes safeguards against the removal or loss of agency records.