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Water Quality

Sloan's Lake Denver

Denver Department of Public Health & Environment (DDPHE) has been monitoring the quality of water in Denver’s lakes and streams for more than 45 years. Over that time, the program has grown to include many other important aspects of water quality. You can learn more about what we do by exploring the topics below.

Water Quality in Lakes and Streams

Information on the results from DDPHE's water quality monitoring efforts summarized in story maps and reports. Includes data on E. coli in Denver.

Recreating in Denver's Lakes and Streams

Current information about water quality in streams and selected public lakes in Denver, recommendations about how to wade or boat safely in Denver’s urban waterways, and public notices and information to help you make informed choices before getting into the water.

Protecting Denver's Water Quality

Learn about efforts by DDPHE, Denver Department of Transportation and Infrastructure, and Parks and Recreation to protect and improve water quality in the City’s lakes and streams.

Other Water Quality Information

More information about what Denver is doing to ensure safe, clean waterways including information about trash and litter, dead or dying birds, suds in streams, and more.