I agree about lawns, fertilizer, and pesticides. But there are also many homes without lawns that do not have a "natural" buffer of plantings--bare soil and sand and unmaintained septic systems are also bad. There's a lot more info available from Lake Winnipesaukee Association, and they will come to your home to advise you on how to make sure your home is lake friendly. They came to my house last year--they were very friendly, had some good recommendations, and it didn't cost anything. I think you just have to call or go to their website if you want a visit.
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