*COUGH* *COUGH*
You are allowed to apply fertilizers as specified in RSA 483-B:9, II(d) down to the 25 ft reference line. Herbicides, etc are 50 ft.
If you look at university studies, fertilizers applied at or below standard application rates don't leach (with a few caveats). Simply said, measure your property and figure out how many sq ft the lawn is (deduct impervious surfaces, etc) and don't over apply. Follow the bag rates (as they will all give you 1 lb/N per 1000 sq ft or less).
That said, anyone who has grass down to the waters edge should consider putting in mulched shrub/perenial beds, etc. Looks better in most cases too. You can't clear but you can add vegetation.
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