Impaired Waters and TMDLs in New England - Region 1

EPA Region 1 serves Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont and 10 tribal nations.

Basic Information

• What is a Total Maximum Daily Load or TMDL?
• What is the Impaired Waters List (303(d) list)?

Region 1 HOT Topics

• Connecticut’s Jointly-Developed Bantam Lake Nutrient TMDLs and NPS Watershed-Based Plan
• Opti-Tool: EPA Region 1's Stormwater Management Optimization Tool
• Information on the Lake Champlain Phosphorus TMDL [UPDATED]

Find Specific TMDLs and Impaired Waters

• Find a TMDL in Region 1
• Find an Impaired Water or a State 303(d) List in Region 1

What is the 303(d) Vision?

• A Long-term Vision for the 303(d) Program

Additional Information and Tools

• Region 1 TMDL and 303(d) Listing Program Contacts
• Region 1 Reports, Selected Regional Projects, and Fact Sheets about TMDLs and Impaired Waters
• Integrated Reporting (IR) Guidance documents
• Summary of State and Regional Water Information (Click on a State/map for its information) [updating in progress]
• Detailed Information on TMDLs and Impaired Waters (Database Query) [updating in progress]
• How's My Waterway?
• ATTAINS database

A TMDL is a clean water - pollutant reduction target, and also allocates an acceptable, allowable amount of each problem pollutant to each source.

The Impaired Waters or 303(d) list documents all of the known polluted water bodies in a state, along
with their pollutant problems (impairments).