List of Approved TMDLs with MS4 WLAs List of Approved TMDLs with MS4 WLAs

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Total Maximum Daily Load (TMDL) Wasteload Allocations (WLAs) approved by the U.S. Environmental Protection Agency (EPA) prior to the November 16, 2020 issuance date of the MS4 (Municipal Separate Storm Sewer System) General Permit (permit) must be addressed by permittees in their Stormwater Pollution Prevention Program (SWPPP) Document, which includes the TMDL Application Form. The Clean Water Act requires the Minnesota Pollution Control Agency (MPCA) to include, in all National Pollutant Discharge Elimination System (NPDES) permits, discharge requirements that are consistent with requirements established in TMDLs. The permit requires applicants to submit information at the time of application on applicable WLAs and document how they will make progress on performance-based WLAs (bacteria, chloride, temperature), demonstrate they are currently meeting their numerical WLAs (oxygen demand, nitrate, total phosphorus or total suspended solids), or develop a compliance schedule for those numerical WLAs that are not being met.

The Municipal Stormwater Permit TMDL WLAs List includes all EPA approved TMDL WLAs for permitted MS4s. Only if you are assigned an applicable WLA in a TMDL that was approved by EPA prior to the issuance date of the new MS4 permit are you required to meet TMDL WLAs permit requirements. Here is a link to MS4 permittees without applicable WLAs. Note: this list is subject to change if additional WLAs are approved by EPA prior to November 16, 2020.

Please click here to download the Municipal Stormwater TMDL WLAs List (updated November 2020): File:Wq-strm4-93b.xlsx