Water Treatment

Drinking Water Quality

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In the wake of the water crisis in Flint, it is understandable that our customers are concerned about their own water quality. We have a qualified staff of water utility professionals who understand the importance that the water supply plays in the overall quality of life for our community.  We are dedicated to providing our customers with the best quality drinking water possible and we continue to meet or exceed all State and Federal regulatory requirements.

The environmental services lab operates 7 days a week, 365 days a year testing your water for over 100 contaminants including:

  • disinfection byproducts
  • metals
  • volatile organic compounds
  • bacteria
  • inorganic contaminants
  • radiological contaminants

There are over 145,000 tests done per year!


Twenty-five years ago, the City began removing the only lead components remaining in our system. These components, called "goosenecks" were used before 1950 to connect the iron water main and the galvanized iron service lines. Today there are about 100 goosenecks remaining, and the City is committed to removing them. In the meantime, these connections are covered by a protective layer of scale that prevents lead from entering the drinking water.

The most recent data from Ann Arbor homes indicates that the lead level in our drinking water is well below the established action levels.

Perfluorinated Compounds (PFOA/PFOS)

Perfluorinated co​mpounds are typically associated with the manufacture of carpeting, personal care products, cookware (e.g., Teflon), and other products. All the latest information on the issue is available on our PFAS information page.​ The City​ is continuing to monitor for these compounds as well as other emerging contaminants, and remains steadfast in its effort to provide safe drinking water for its customers. If you have any specific concerns or other questions, we look forward to answering them. We can be reached at 734.994.2840 or water@a2gov.org.​

​Special needs information:

Basic chemical water quality measures are available on a monthly basis. A more detailed listing of measures are available on the annual water quality report.  

Fish owners:

Using untreated city drinking water in fish tanks, ponds and aquariums​ is harmful to fish and any organism with gills. Ammonia is present in the city’s drinking water at approximately 0.25 parts per million (mg/L). This ammonia is bound with chlorine in the water to form the water supply’s disinfectant, chloramine. While ammonia at these levels has no adverse impact on humans or other mammals, it is harmful to fish or any organism with gills. Therefore, the ammonia must be deactivated before using city water in a pond or aquarium containing fish. It is important to note that simply removing the chlorine from the water will not remove the ammonia. Instead, fish owners may add certain chemicals to the water to deactivate the ammonia. Products containing these chemicals can be purchased at local pet supply and aquarium shops. The city recommends fish owners consult with a pond or aquarium professional to select the appropriate product.   

919 Sunset Road
Ann Arbor, MI 48103
Phone: 734.994.2840
or 734.794.6426

Business Hours: M-F 8 a.m. to 5 p.m. (except city holidays)

After hours water emergencies

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