Science & Technology

Report: Retrospective Case Study in Northeastern Pennsylvania (PDF)

PDF of EPA report Retrospective Case Study in Northeastern Pennsylvania

Sources Contributing Inorganic Species to Drinking Water Intakes During Low Flow Conditions on the Allegheny River in Western Pennsylvania

EPA scientists evaluated sources of bromide and other inorganic pollutants impacting drinking water intakes on the Allegheny River in Western Pennsylvania.

Report: Retrospective Case Study in Southwestern Pennsylvania (PDF)

PDF of EPA report Retrospective Case Study in Southwestern Pennsylvania

Report: Retrospective Case Study in Wise County, Texas (PDF)

PDF of EPA report of Retrospective Case Study in Wise County Texas

Human Health Water Quality Criteria for PFAS

The EPA is using its Clean Water Act authority to develop national recommended water quality criteria for per- and polyfluoroalkyl substances (PFAS) in surface water that are protective of human health.

CEDRI - Stats

Compliance and Emissions Data Reporting Interface

Stakeholder Webinar (Oct. 2023): Natural Gas & Petroleum Systems in the GHG Inventory

GHGI October 2023 Webinar Supporting Materials

EPA Announces $697,000 to Protect Waterways from Sewage Overflows in South Carolina

U.S. Environmental Protection Agency (EPA) announced the availability of approximately $80 million through the Sewer Overflow and Stormwater Reuse Municipal Grant program to help communities address stormwater and sewer infrastructure needs.

• Release Date: April 30, 2026

Report: EPA Needs to Improve Processes for Securing Region 8’s Local Area Network

Report #20-E-0309, September 10, 2020. Exploitation of vulnerabilities may result in the loss of confidentiality, integrity, and availability of personally identifiable information and scientific data.

Report: Fiscal Years 2019 and 2018 Financial Statements for the Pesticide Registration Fund

Report #20-F-0328, September 23, 2020. We found the EPA's PRIA Fund financial statements to be fairly presented and free of material misstatements.

Report: EPA's Lack of Oversight Resulted in Serious Issues Related to an Office of Water Contract, Including Potential Misallocation of Funds

Report #20-P-0331, September 25, 2020. Improved contract management will help the EPA become a better fiscal steward and potentially save millions of taxpayer dollars.

Report: EPA Has Sufficiently Managed Emergency Responses During the Pandemic but Needs to Procure More Supplies and Clarify Guidance

Report #20-E-0332, September 28, 2020. On-scene coordinators may not be safe deploying during the COVID-19 pandemic without sufficient personal protective equipment and clear guidance.

Report: Improved EPA Oversight of Funding Recipients' Title VI Programs Could Prevent Discrimination

Report #20-E-0333, September 28, 2020. Despite elimination of the case backlog, additional improvements in the EPA's oversight of Title VI funding recipients could prevent discrimination.

Report: Regions 1 and 5 Need to Require Tribes to Submit More Detailed Work Plans for Grants

Report #20-E-0335, September 29, 2020. Inadequate work plans in Regions 1 and 5 put tribal grants at risk for unsupported costs.

Report: Data Used for Annual Toxics Release Inventory National Analysis Are 99 Percent Complete, but EPA Could Improve Certain Data Controls

Report #20-P-0337, September 30, 2020. The EPA's efforts to follow up with late reporters prior to “freezing” the data contributed to more complete data.

Report: Audit of EPA's Toxic Substances Control Act Service Fee Fund Financial Statements for the Period from Inception (June 22, 2016) through September 30, 2018

Report #20-F-0342, September 30, 2020. We found the fund's financial statements to be fairly presented and free of material misstatement.

Semiannual Report to Congress: April 1, 2020 to September 30, 2020

Report #EPA-350-R-20-002, November 2020. The OIG’s continued productivity and oversight accomplishments are evidenced in this Semiannual Report to Congress.

Report: EPA's Fiscal Years 2020 and 2019 (Restated) Consolidated Financial Statements

Report #21-F-0014, November 16, 2020. We found the EPA's financial statements to be fairly presented and free of material misstatement.

Report: Audit of the U.S. Chemical Safety and Hazard Investigation Board's Fiscal Years 2020 and 2019 Financial Statements

Report #21-F-0015, November 16, 2020. The CSB received an unmodified opinion on its fiscal years 2020 and 2019 financial statements.

Report: EPA's Initial Plans for Returning to the Office Incorporate CDC Guidance but Differ by Location

Report #21-E-0030, November 30, 2020. The EPA's initial plans for returning to the office incorporate Centers for Disease Control guidance but differ by location.