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

• Opti-Tool: EPA Region 1's Stormwater Management Optimization Tool
• EPA Cape Cod 208 Plan 2015 Update Approval Letter
• Information on the Lake Champlain Phosphorus TMDL being developed by EPA

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 Region 1 Information

• Region 1 Reports, Selected Regional Projects, and Fact Sheets about TMDLs and Impaired Waters
• Summary of State and Regional Water Information (Click on a State/map for its information)
• Detailed Information on TMDLs and Impaired Waters (Database Query)
• Region 1 TMDL and 303(d) Listing Program Contacts