DEEP: Total Maximum Daily Load

Total Maximum Daily Load (TMDL)

A Total Maximum Daily Load (TMDL) is a tool Water Quality Managers use to address water quality problems. TMDLs provide the framework for restoring impaired waters by establishing the maximum amount of a pollutant that a waterbody can take in without adverse impact to fish, wildlife, recreation, or other public uses.

TMDL Fact Sheet (PDF)

Statewide Bacteria TMDL (EPA approved September 2012; additional estuary appendices approved September 2013) 
Pawcatuck TMDL appendices

Proposed TMDL Analyses

Final TMDL Analyses

Regional TMDL Analysis for Mercury

As an alternative water quality management plan, view the Watershed Response Plan for Impervious Cover found on the Stormwater Planning Tool for Impervious Cover web page.
NEW - Integrated Water Resource Management is a new CT DEEP approach to the TMDL program to work more effectively towards restoring and protecting our waters. This approach is done under existing TMDL authority and doesn’t create new regulations, but enhances CT DEEP TMDL efforts by focusing state resources, building on partnerships, and looking at flexible and efficient ways to connect our environmental data with actions that protect or restore Connecticut’s waters.


Proposed TMDL Analyses

A proposed TMDL analysis is a draft document in the process of being adopted.

 Fairfield, CT
 Actions to be taken to address water
 quality impairments
 Norwalk Estuary  Draft Document
 Greenwich/Stamford Estuary  Draft Document
 Westbrook Estuary  Draft Document

Final TMDL Analyses

A final TMDL analysis is one that has been adopted by CT Department of Energy and Environmental Protection and approved by the federal Environmental Protection Agency.

Allen Brook Pond, Allen Brook, Gay City Pond, and Schreeder Pond
New Haven, Tolland, and Middlesex Counties
(PDF, 2548K)
Batterson Park Pond
Farmington and New Britain
Final - November 22, 2004
(PDF, 1887K)
Belden Hill Brook
Final - May 21, 2000
(PDF, 567K)
Cedar Pond
North Branford
Final - November 28, 2005
(PDF, 3604K)
Deep Brook
Eagleville Brook
(PDF, 618K)
East Branch Salmon Brook and Mountain Brook, Hartford County 
Ekonk Brook
Plainfield, Sterling, Voluntown
Factory Brook
Final - September 30, 1999 (PDF - 1064K)
Hayden Creek
Final - February 1, 2002
(PDF, 283K)
Hockanum River
Hartford County
Kenosia Lake
Final - July 23, 2004
(PDF, 625K)
Linsley Pond
Final - November 28, 2005
(PDF, 435K)
Limekiln Brook
Final - June 6, 2002
(PDF, 630K)
Long Island Sound
CT and NY
Final - December 2000
(PDF, 329K)
Mattabesset River Regional Basin
Hartford/Middlesex and New Haven Counties
Final - June 1, 2005
(PDF, 2453K)
Mill River, Rooster River, and Sasco Brook
Bridgeport, Fairfield, and Westport
Naugatuck River Regional Basin
Litchfield and New Haven Counties
Norwalk River Regional Basin
Fairfield County
Pequabuck River
Hartford and Litchfield Counties
Quinnipiac River Regional Basin
New Haven and Hartford Counties
Rainbow Brook and Seymour Hollow Brook
Windsor Locks and Windsor
Final - October 15, 1999 (PDF, 2033K)
Sasco Brook
Fairfield and Westport
Southport Harbor
Long Island Sound: Westport, Fairfield area
Steele Brook
Final - December 2000
(PDF, 496K)
Still River
Fairfield and Litchfield Counties
Final - July 2010 (PDF, 30MB)
Titicus River
Transylvania Brook
Final - February 22, 2001
(PDF, 571K)
Upper Naugatuck River
Final - March 2005
(PDF, 892K)
Upper Willimantic River
Final - April 25, 2001
(PDF, 382K)

Final Regional TMDL analysis, adopted by CT Department of 
Energy and Environmental Protection and other Northeastern States and approved by the federal Environmental Protection Agency.

Total Maximum Daily Load (TMDL)
Final TMDL Analysis - December 20, 2007, (PDF, 664K)
Content last updated August 31, 2018