Toxic chemicals—such as dangerous heavy
metals and even common pesticides
used around the house—are a major threat to estuaries across the
country. Toxic chemicals can build up in the tissues of fish and
cause more problems as they work their way up the food
chain. Toxic substances can enter estuaries through “point
sources” (a single place) such as hazardous waste from a factory
pipe or through “nonpoint
sources” (many places) such as rainwater that washes over
parking lots, lawns, or farms. Towns will close shellfish beds or
fisheries if they become contaminated by toxic chemicals.
more about toxic chemicals.
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