Did a little Googling; the Seashore lists one pond in Truro contaminated but the study is on-going. Musta been a fairly recent addition. They claim the source is atmospheric. Smoke from coal fired power plants are big producers of mercury.
Personally, I think it's a crock o doo. In the case that you state, I believe it may either be a counterfeit sign or an inside job to keep us nasty knuckle dragging fishermen away from someone's trophy home. Seen it before. No signs until a fisherman is spotted. How many people are poisoned by mercury in this country?
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