Total Maximum Daily Loads (TMDLs) are EPA approved amounts of pollutant loading that can occur and have a water body meet water quality standards. This page is collection of links and resources to better understand, and meet, TMDL requirements.

image of Miss and St Croix rivers confluence
Confluence of the St. Croix and Mississippi rivers. Note the St. Croix River is not impaired for sediment, while the Mississippi River is impaired.

TMDL MS4 permit guidance

TMDL toolkit for MS4 permit compliance

Access a quick guide for using models to meet MS4 TMDL requirements

TMDL guidance and general information

Information received from MS4 permittees

Links and other resources

This page was last edited on 12 January 2023, at 17:24.