Laws & Regulations

National Contaminant Occurrence Database (NCOD)

This site describes water sample analytical data that EPA is currently using and has used in the past for analysis, rulemaking, and rule evaluation. The data have been checked for data quality and analyzed for national representativeness.

Six-Year Review 4 Compliance Monitoring Data (2012-2019)

Occurrence data collected under the SYR4 Information Collection Request and from the ARCS data base containing aircraft PWS inventory and sample information.

Major Elements of Six-Year Review

Learn about the six components EPA uses to evaluate national primary drinking water regulations during a six-year review

Six-Year Review 3 Frequent Questions and Answers

Risk Management for 1,4-Dioxane

Risk management page for 1,4-dioxane, launched following the release of the final risk evaluation.

Fact Sheet: Announcement of Completion of EPA's Third Six-Year Review of Existing Drinking Water Standards

The fact sheet contains questions and answers about EPA's third Six-Review of Drinking Water Standards

Addressing Risk-Balancing Considerations for Six-Year Review of Drinking Water Standards

Drinking Water State Revolving Fund - Statutory Authority and Program Regulation

40 CFR Subpart L—Drinking Water State Revolving Funds Regulation
§35.3500 - §35.3585

Drinking Water State Revolving Fund (DWSRF)

This website provides information on financial assistance to water systems needing capitalization grants and/or technical assistance to improve the quality of drinking water and for the delivery of safe drinking water to consumers.

Materials for November 2023 Webinar on Proposed Regulation of Trichloroethylene under TSCA

Materials page for webinar on risk management for TCE

Federalism Consultation Letters - Region 10

Provides letters submitted by representatives from states in Region 10 as part of the waters of the US rulemaking federalism consultation

Federalism Consultation Letters - Region 6

Provides letters submitted by representatives from states in Region 6 as part of the waters of the US rulemaking federalism consultation

Final Rule: Addition of 12 Chemicals to the Toxics Release Inventory

Additions of 12 chemicals to TRI per TURI petition.

Toxics Use Reduction Institute (TURI) Petition to Add 25 Chemicals to the TRI List

Petition by TURI to add 25 chemicals to the TRI Program chemical list.

EPA/HUD Model Refresher Lead Dust Sampling Technician Training Course

lead dust sampling technician model refresher training course

Federalism Consultation Letters - Region 9

Provides letters submitted by representatives from states in Region 9 as part of the waters of the US rulemaking federalism consultation

Tribal Consultation Letters - Regions 9 and 10

Provides letters submitted by representatives from federally recognized tribal governments as part of the waters of the US rulemaking tribal consultation

Federalism Consultation Letters - Region 5

Provides letters submitted by representatives from states in Region 5 as part of the waters of the US rulemaking federalism consultation

Federalism Consultation Letters - Region 4

Provides letters submitted by representatives from states in Region 4 as part of the waters of the US rulemaking federalism consultation

Federalism Consultation Letters - Region 1

Provides letters submitted by representatives from states in Region 1 as part of the waters of the US rulemaking federalism consultation