Laws & Regulations
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Navajo Nation National Pollutant Discharge Elimination System (NPDES) Permits
EPA’s Pacific Southwest (Region 9) issues all NPDES permits on Navajo Nation tribal lands.
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NN0020265: Navajo Tribal Utility Authority (NTUA) Chinle Wastewater Treatment Plant and Collection System, Chinle, AZ
NPDES Permit No. NN0020265 for Navajo Tribal Utility Authority Chinle Wastewater Treatment Facility.
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Overview of the Public Notification Rule webinar
Webinar slides for "Overview of the Public Notification Rule" presented on March 31, 2021.
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Stage 1 and Stage 2 Disinfectants and Disinfection Byproducts Rules
This page goes over Stage 1 & Stage 2 Disinfectants And Disinfection Byproducts Rules including a summary, compliance information, additional resources, and history.
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WSG 214
WSG 214
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Memo Clarifying Requirements and State Reporting Guidance to Transition to the Revised Total Coliform Rule
This memorandum provides guidance to primacy agencies with enforcement responsibility under the Safe Drinking Water Act (SDWA) concerning the requirements to transition public water systems (PWSs) from the Total Coliform Rule (TCR) to the RTCR
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Simultaneous Compliance Workbook
Simultaneous Compliance Workbook
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SWTR Plain English Guide
Surface Water Treatment Rule (SWTR) – June 1989
• Interim Enhanced Surface Water Treatment Rule (IESWTR) – December 1998
• Long Term 1 Enhanced Surface Water Treatment Rule (LT1ESWTR) – January 2002
• Long Term 2 Enhanced Surface Water Treatment Rule -
Turbidity Provisions
SWTR Turbidity Guid
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RTCR State Imp. Guidance Manual
This document provides guidance to states, tribes and the U.S. Environmental Protection Agency (EPA) exercising primary enforcement responsibility under the Safe Drinking Water Act (SDWA) and contains EPA’s current policy recommendations for complying with
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Total Coliform Rule Compliance Help for Primacy Agencies
This document provides guidance to states, tribes and the EPA Regions exercising primary enforcement responsibility under the Safe Drinking Water Act (SDWA). It contains EPA’s current policy recommendations for complying with the RTCR.
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DBPRs: What Does it Mean to You?
EPA provides guidance documents to help states and public water systems (PWSs) implement the Stage 1 and Stage 2 Disinfectants and Disinfection Byproducts (DBP) Rules. The materials below can assist in complying with requirements of these Rules.
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Texas SIP: 30 TAC 114.50, Vehicle Emissions Inspection Requirements, SIP effective December 6, 2016 (TXd187), July 14, 2017 (TXd196), and May 8, 2025 (TXd248)
Texas SIP: 30 TAC 114.50-114.53. Vehicle Inspection and Maintenance; SIP effective 2016-12-06 (TXd187) and 2017-07-14 (TXd196)
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DMAP GraphQL API
Envirofacts is developing web services to facilitate the sharing of its functionality and information. The Envirofacts GraphQL service is detailed on this page.
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Vermont's 2020 303(d) List Report and Related Documents
View supporting documents for Vermont's 2020 section 303(d) list of impaired waters.
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Release Detection for Underground Storage Tanks and Piping: Straight Talk on Tanks
Review easy-to-understand descriptions of several leak detection methods for tanks and piping, as well as explanations of the regulatory requirements for leak detection.
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Estimating Air Emissions from Petroleum UST Cleanups
Learn about estimating air emission rates of volatile organic compounds (VOCs) and benzene at individual underground storage tank (UST) cleanup sites.
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Underground Storage Tank Flood Guide
Review simple guidelines and useful information for state, local, and tribal authorities in the event of a threatened or actual flood.
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Resources for UST State and Territorial Implementing Agencies
State and territorial agencies implementing underground storage tank programs can find helpful information on requirements and compliance resources.
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Mercury
Basic information about mercury, how it gets in the air, how people are exposed to it and health effects associated with exposure; what EPA and other organizations are doing to limit exposures; and information about products that contain mercury