Invasive Aquatic Species
Maine is one of the few states in the US with largely uninfested waters. Help us keep it that way by learning more!
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Become a Certified Water Quality Volunteer
Every year Lake Stewards of Maine trains dozens of new Water Quality and Aquatic Invasive Species Monitors. Join the fun!
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Learn about the Lakes of Maine
Learn more about the Lakes of Maine, the water quality, native and invasive plants, fish species, and loon nesting.
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Cyanobacteria Blooms
This green water is caused by an overgrowth of cyanobacteria, find out more about them...
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Our Mission

Lake Stewards of Maine (LSM) works to protect Maine lakes and to promote lake stewardship through widespread citizen participation in the gathering and dissemination of credible scientific information pertaining to lake health.

Our Initiatives

Water Quality

Water Quality

Learn about the imminent threats to Maine lakes. Development of lake watersheds is near the top of the list, and perhaps the most pervasive.



Learn how volunteers help control the widespread destructive consequences of non-native invasive aquatic plant and animal species.

Watershed Survey

Watershed Survey

Learn how to identify, monitor, and mitigate polluted stormwater runoff and other ways in which watershed land use influences lake water quality.

Maine Lake Date

Maine Lake Data

Learn more about your lake and other lakes in Maine. Find information on water quality, aquatic species, invasives, and amenities.

Valuable technical content

Woody Trask

The webinars and Zoom chats put on by Lake Stewards during the pandemic have provided valuable technical content along with social networking and opportunities for data sharing that makes us better stewards. Thank you.

Woody Trask

LSM Rocks!

Ross & Christine Swain

Staff is friendly, accessible, and always willing to share their knowledge. LSM ROCKS!

Ross and Christine Swain

Beacon of knowledge & resources

Bunny & Ross Wescott

At the beginning of the millennium when we were worried about invasives coming to Panther Pond, we were working in the dark; then we found LSM which has been our beacon of knowledge and resources ever since.

Bunny and Ross Wescott

Professional, efficient & helpful

Debbie and Dale Broderick

Dale and I had our first experience with LSM through their online plant ID course during COVID-19. We have been impressed at how professional, efficient and helpful everybody has been in all our interactions with them. They are always willing to enthusiastically share their love of lakes with us. Though we have yet to meet the team members in person, we feel strongly connected to them, as friends who have a lot in common.

Debbie Broderick
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