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Delaware is small, but its water sources split cleanly. Wilmington and much of New Castle County draw from the Brandywine and other surface streams, while most of Kent and Sussex counties rely on groundwater from coastal plain aquifers. Shallow wells in agricultural areas can show nitrates, and some sandy aquifers carry iron and low pH water that is hard on copper. Clear Drop Filtration plans whole house water filtration in Rehoboth Beach, DE from a water test: carbon and sediment stages for city water, and pH, iron or specialty stages for wells. Delaware has also seen PFAS detections near some military and industrial sites.