Jeff Stern and Liz Rothrock put their kayaks into the water Sunday at the Lake Anasagunticook boat launch in Canton as part of a 50th anniversary celebration of the federal Clean Water Act. Andree Kehn/Sun Journal

Tom Hamilton, right, demonstrates a water quality test Sunday to Tim Kirwan at Lake Anasagunticook in Canton, while Jeff Stern stands at left. Hamilton has been an official water quality monitor for the lake association for 25 years, and measures phosphates, dissolved oxygen, temperature and clarity. A small group of kayakers departed from the boat launch Sunday morning as part of a 50th anniversary celebration of the federal Clean Water Act. Andree Kehn/Sun Journal