Public Works

Surface Water & Sewers Division
309 2nd Ave. S.
Minneapolis, MN 55401-2268

To contact, call 311.

Monitoring and Analysis

Water quality and stormwater monitoring provides valuable information on the health of the Mississippi River and lakes, creeks and wetlands of Minneapolis, helping to identify problems and measure the effectiveness of efforts to minimize pollution.

The Minneapolis Park and Recreation Board (MPRB) performs and documents extensive water quality monitoring and data collection as part of efforts to protect and care for the 13 lakes, three creeks and the Mississippi River in Minneapolis.

The Annual Water Resources Report is a comprehensive technical reference of water quality information. The report is available on the MPRB website as well as at Minneapolis public libraries.

Lake Water Quality Monitoring Program

MPRB monitors Minneapolis lakes for water quality to track trends, as long-term monitoring is important because lakes can change from year to year. Analyzing years of data together must be done to see trends that will determine if the water quality is improving or not. This is also used to develop water quality goals and evaluate the effectiveness of Best Management Practices.

The Minneapolis Lake Water Quality Monitoring Program began in 1991 as part of a study for the Chain of Lakes Clean Water Partnership, including Brownie, Bde Maka Ska, Cedar, Harriet and Isles, Diamond, Hiawatha, Loring, Nokomis, Powderhorn, Webber, Wirth and Spring Lakes.

Beach Monitoring

Stormwater can contain waterfowl and pet waste, which can contribute to increased bacteria levels in the Mississippi River, as well as the lakes and creeks of Minneapolis.

Water from public beaches is monitored weekly and checked for bacteria throughout the summer, as high bacteria levels can pose a health risk for swimmers. If high bacteria levels are present in the water samples from a public beach, MPRB may close the beach until the water is safe for swimming.

Best Management Practices (BMP) Monitoring

Public Works first installed grit chambers in 1915, and currently maintains 145 grit chambers. Private grit chambers exist in Minneapolis, as well as grit chambers owned by Hennepin County and the Minnesota Department of Transportation.

Grit chambers are large underground concrete boxes with baffles, which allows the water to slow down, while sediment and heavy materials settle to the bottom of the chamber before exiting. All grit chambers remove sediment, trash and debris from stormwater runoff, keeping this material out of receiving surface waters, while some grit chambers filter stormwater as well.

Public Works and MPRB began monitoring grit chambers in 1998, developing goals that include:

Additional Monitoring

The following list shows additional MPRB monitoring and water quality data collection:

Additional monitoring is performed by individual watershed management organizations in Minneapolis.

Last updated Feb 5, 2019



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