Michigan's Statewide E. coli Total Maximum Daily LoadContact: Molly Rippke 517-284-5547
When a water quality standard is exceeded, the Federal Clean Water Act requires Michigan to address pollution issues with either a Total Maximum Daily Load (TMDL) or by fixing the problem through other means. For some issues, a remedy is already in progress to reduce pollution. This is not the case for E. coli across the state. This TMDL will provide a framework for restoration of water quality.
Routine testing has shown E. coli levels in many areas are above the standard. These levels increase the risk of illness upon contact or incidental ingestion of the water. Given the extent of this problem, and the multitude of potential sources, a statewide approach will be more effective and more efficient at addressing this issue. To learn more, please visit the E. coli in Surface Waters website.
Long term solutions to bacterial problems can only be accomplished through a collaborative approach. In addition to its work on effective National Pollutant Discharge Elimination System (NPDES) permit requirements and corrective actions on illegal sources, the MDEQ is looking for assistance from landowners, local health departments, conservation districts, other state and local agencies, and environmental groups to focus voluntary improvements in areas where nonpoint sources are a problem. Please see our Guide for Homeowners to find out how you can help reduce E. coli contamination of our rivers, lakes and beaches.
If your group is interested in a presentation on E. coli or TMDLs, please complete the TMDL presentation request form.
To support the TMDL, a new statewide, interactive mapping tool is available to assist in identifying impacted areas as well as provide resources for getting involved in efforts to reduce the E. coli levels. The purpose is to encourage and empower local communities to protect our waters.
A map help document is available.
NEW VIDEOS AVAILABLE! Videos will help you to perform the following tasks in the mapper:
- Video: How do I find out if my facility or location is in a TMDL?
- Video: How can I find E. coli data for lakes or rivers near me?
- Video: How can I find out information on potential E. coli point sources (NPDES discharges) near me?
Public Notice for the Draft Statewide E. coli TMDL
The revised draft Statewide E. coli TMDL is closed, although the draft is still available. Comments that were received by May 19th will be considered and incorporated, as appropriate, into the TMDL document submitted to the United States Environmental Protection Agency (USEPA) for approval.
Webinars and Public Meeting Recording Available
Public Meeting Recording (May 9th)
The DEQ hosted a public meeting (in Lansing and via webinar) on May 9th to discuss the revised draft statewide E. coli TMDL. This presentation gave an overview of the TMDL with a focus on revisions that have been made based on public comments and frequently asked questions.
- Webinar 1: General Overview of the Statewide E. coli TMDL
- Webinar 2: Nonpoint Sources
- Webinar 3: Information for MS4 Permittees
- Webinar 4: Information for Industrial Stormwater Permittees
- Permit Holders and Landowners Frequently Asked Questions
- Homeowner's Guide to Reducing E. coli
- Statewide E. coli TMDL Fact Sheet
- Links to Funding Sources (from Webinar)
Links to Other MDEQ Web Sites:
Implementation Guidance Documents:
- Conducting a Subwatershed-Scale Source Survey - Remote Sensing
- Locating Priority Areas for Septic System Investigations
- Conducting a Subwatershed-Scale Source Survey - Field Inventories
- E. coli Pollutant Source Identification Data Sheet
- E. coli Success Stories
NPDES Permit Holders:
- Understanding TMDL Requirements (for Industrial Storm Water)
- Municipal Separate Storm Sewer System (MS4)
- MiWaters Site Explorer - link, disclaimer, and tips
This page can be accessed using www.mi.gov/ecolitmdl.