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Community Drinking Water
Water is essential for health. A water supply that is safe is important for public health. Safe drinking water is made possible by local, state, and federal drinking water protection programs. More than 90 biological and chemical contaminants have water quality standards and monitoring requirements.
Drinking water data are available for Haloacetic Acids (HAA5) and Total Trihalomethanes (TTHM) in community water systems on the MiTracking data portal.
About 75% of Michigan residents get their water from sources that are regulated through the following acts:
- The U.S. Environmental Protection Agency (EPA) sets regulations and standards for monitoring and treating drinking water through the Safe Drinking Water Act.
- The Michigan Department of Environment, Great Lakes, and Energy (EGLE) enforces these standards through the Michigan Safe Drinking Water Act.
About 25% of Michigan residents get their water from small water supplies such as private wells. Local health departments carry out programs for private wells and some other types of water supply systems.
For more information on the community water supply program, visit EGLE - Community Water Supply.
Drinking water can become contaminated through natural and human-made means. Such contamination requires that the water be treated with disinfectants to help kill anything that may cause disease. Some naturally occurring contaminants are bacteria, parasites, arsenic, radon, and uranium. Human-made contaminants include manufacturing processes, local land use practices (fertilizers, pesticides, concentrated feeding operations), sewer overflows or wastewater releases, and disinfectant byproducts.
For more information on contaminants, visit CDC - Water-related Diseases and Contaminants in Public Water Systems or EPA - Types of Drinking Water Contaminants.
Get Your Private Well Water Tested
If you have a private well, you are not required to test your water. However, having your private well water tested is a good practice to make sure it is safe. There is a fee for having your well water tested. Contact your local health department for more information. Private well owners in Michigan can also call the new MDHHS Drinking Water Investigation Unit "Water Hotline" 844-934-1315 for help finding the best water testing option.
For more information, visit CDC - Well Testing.
Maintain Your Septic Tank
If you have a septic system, be sure to maintain it to keep biological contaminants out of your drinking water and the environment.
For more information, visit EPA - Your Septic System.
Read Your Community Water Consumer Confidence Report
If you are on a community public water supply, read the Consumer Confidence Report that your water supplier sends you each year. It gives you information about your supplier and if it had violations of drinking water regulations during the year. Every community water supplier is required to provide the report to all of its customers by July 1 of each year.
Help Reduce Water Pollution
Help reduce water pollution by reducing the amount of fertilizer and pesticides you use, which includes insecticides and herbicides, and take steps to keep pollutants away from storm drains.
For more information, visit EPA - Pollution Prevention Tips at Home.
Disinfection Byproduct (DBP) Contaminants MiTracking Indicators
- Total trihalomethanes (TTHM)
- Haloacetic acids (HAA5)
MiTracking DBP Contaminant Data Can Tell Us
- Average concentration of each contaminant by each Community Water System (CWS)
- Number of CWS by average chemical concentrations
- Number of CWS by maximum chemical concentrations
- Number of people served by CWS by average chemical concentrations
- Number of people served by CWS by maximum chemical concentrations
MiTracking DBP Contaminant Data Cannot Tell Us
- Differences in how much disinfection byproducts (DBPs) a person might be exposed to throughout the year because
- levels of DBPs change with the seasons,
- sampling schedules vary among community water systems, and
- levels of DBPs increase or decrease depending on how far they have traveled through the water distribution system.
- Information about drinking water from private wells or public water systems that are not used the entire year
- How much of the contaminant an individual person may have been exposed to
- If contaminants in drinking water caused an individual’s illness
Find Out More
Data from the Michigan Department of Environment, Great Lakes, and Energy (EGLE) Safe Drinking Water Information System (SDWIS) were used to create this dataset.
For more data information, visit:
Centers for Disease Control and Prevention (CDC)
Environmental Protection Agency (EPA)
Michigan Department of Environment, Great Lakes, and Energy (EGLE)
Michigan Department of Health and Human Services (MDHHS)
National Environmental Public Health Tracking (Tracking Network)
National Groundwater Association (NGWA)
State of Michigan
Centers for Disease Control and Prevention. Drinking Water and Health. https://ephtracking.cdc.gov/showWaterDrinkingHealth.action. Accessed February 18, 2020.