10 Delaware water districts with results read from their own annual water quality report or EPA testing, largest first.
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- Artesian Water Company231,114 people · 25 results
- Wilmington Water Department107,976 people · 17 results
- Rehoboth Pump District (Tui)73,860 people · 19 results
- Newark Water Department40,000 people · 10 results
- Dewey Beach Water Department31,000 people · 12 results
- Artesian Southern Sussex Regional18,015 people · 17 results
- Middletown Water Department17,700 people · 8 results
- Camden Pump District17,208 people · 13 results
- Smyrna Water Department11,813 people · 1 results
- Dover Air Force Base11,000 people · 3 results