MORE INFORMATION Annual Water Quality Reports Monthly Water Quality Reports All Water Tests

MWRA and its member water communities perform hundreds of thousands of tests each year on hundreds of different parameters. This extensive testing covers over 120 compounds regulated by the Environmental Protection Agency and the Massachusetts Department of Environmental Protection, as well as many other compounds that are not yet regulated. The water quality data are posted regularly on our website including the annual and monthly water quality reports.

As the data shows, year in and year out, the results are excellent.  Few compounds are found, and those that are found are well below the federal and state health-based standards. These excellent results are due to the well protected watersheds that surround Wachusett and Quabbin Reservoirs as well as state-of-the-art disinfection at the new Carroll Water Treatment Plant.  In 2005, the Carroll Plant started to use ozone which provided better disinfection while also reducing the level of disinfection by-products, which are now at an all-time low. 

Check out the data and information on our water system. MWRA has great confidence in the water we deliver to your home and wants you to have the same confidence.

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Updated December 14, 2009