New Mapping Tool Debuted with Statewide Approach to E. coli Reduction in Rivers and Lakes

February 2, 2017

For more Information:
Molly Rippke, Senior Aquatic Biologist, 517-342-4419,
Melody Kindraka, Public Information Officer, 517-284-6716,

For the first time, Michigan residents will be able to get up-to-date information about the presence of E. coli in their community and the potential sources of the bacteria with the creation of a new interactive mapping tool.  The new statewide tool accompanies the launch of public discussion about Michigan’s plan to reduce E. coli levels in rivers, lakes and beaches.  The tool is available at

The reduction plan, known as the Total Maximum Daily Load (TMDL), outlines a cooperative strategy by state and local agencies, watershed groups, landowners, and environmental groups.  Michigan is the first state in the Midwest to move forward with establishing a statewide approach to addressing E. coli.  It is a big first step toward achieving acceptable water quality and is meant to educate and empower people to be an active part of the solution.

Routine testing recently has shown E. coli levels in many areas are above the established standards.  Currently there are 196 rivers, lakes, and beaches identified by the Michigan Department of Environmental Quality (MDEQ) with higher than acceptable levels.  These levels increase the risk of illness upon contact or incidental ingestion of the water. 

Sources of E. coli can include untreated human sewage, failing septic tanks, livestock agriculture, pets, wildlife, and illegal connections from home sewer systems to surface water.

As noted in the Governor’s 21st Century Infrastructure Commission Report, failing septic systems and other deteriorating infrastructure are major contributors to E. coli levels and represent a significant public safety concern. The report recommends the creation of a statewide septic code as well as encourages communities to identify and prioritize aging infrastructure for replacement.

The MDEQ is initiating a public discussion period on the existing regulatory and best management practices outlined in the proposed TMDL.  The discussion includes webinars, public presentations, and stakeholder comments.  A required formal, 30-day, public comment period will take place in early spring following the initial feedback.

The MDEQ is dedicated to respect for Michigan’s citizens, stewardship of the environment, and support for a sustainable economy.