Support LSM Lake Stewards who are monitoring the health of hundreds of lakes throughout Maine. The direct involvement of dedicated LSM citizen lake scientists plays a vital role in maintaining and improving the water quality of Maine lakes and is a major contributing factor when newly established populations of aquatic invasive species are quickly detected, effectively surveyed, brought under control and sometimes successfully eradicated from our lakes.

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Our Mission

The Mission of the Lake Stewards of Maine (LSM) is to help protect Maine lakes through widespread citizen participation in the gathering and dissemination of credible scientific information pertaining to lake health. LSM trains, certifies and provides technical support to hundreds of volunteers who monitor a wide range of indicators of water quality, assess watershed health and function, and screen lakes for invasive aquatic plants and animals. In addition to being the primary source of lake data in the State of Maine, LSM volunteers benefit their local lakes by playing key stewardship and leadership roles in their communities.


LSM is a non-profit 501(c)(3) organization committed to the collection of information pertaining to lake water quality. For 40 years, trained volunteers throughout Maine have donated their time so that we may all learn more about one of Maine’s most beautiful and important resources — our lakes.