County · Maine
Knox County, Maine: drinking water records
This overview covers 19 ZIP codes and 17 community water systems in Knox County. It also stands in for 7 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Vinalhaven Water District ME0091550 | 1,053 | 95 | 0 | 7 | 1.5 ppb |
| Maine Water Company Camden & Rockland ME0090300 | 21,315 | 120 | 0 | 0 | 4.5 ppb |
| Mountainside Mobile Home Park ME0002346 | 130 | 0 | 0 | 1 | 2 ppb |
| Crawford Commons ME0095190 | 50 | 0 | 0 | 1 | 1.5 ppb |
| Village at Rockport #4 ME0392711 | 43 | 0 | 0 | 1 | 0 ppb |
| Village at Rockport #1 ME0092711 | 30 | 0 | 0 | 4 | 0 ppb |
| Maine Water Company Warren Division ME0091565 | 815 | 0 | 0 | 0 | 0 ppb |
| North Haven Water Department ME0091130 | 740 | 0 | 0 | 0 | 0.6 ppb |
| Tenants Harbor Water District ME0092335 | 378 | 0 | 0 | 0 | 0 ppb |
| Port Clyde Water District ME0091290 | 330 | 0 | 0 | 0 | 4.1 ppb |
| Maine Water Company Union Division ME0091537 | 238 | 0 | 0 | 0 | 0.5 ppb |
| Friendship Water Department ME0092040 | 85 | 0 | 0 | 0 | 1.1 ppb |
| Elliott Apartments ME0092552 | 55 | 0 | 0 | 0 | 0 ppb |
| Four Winds Homeowners Assn ME0092371 | 43 | 0 | 0 | 0 | 1.6 ppb |
| Village at Rockport #2 ME0192711 | 30 | 0 | 0 | 0 | 0 ppb |
| Village at Rockport #3 ME0292711 | 25 | 0 | 0 | 0 | 2.8 ppb |
| Voa/Nne Senior Housing NH1402030 | 50 | 0 | 0 | 0 | not reported |
ZIP reports in Knox County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 04563, 04574, 04851, 04854, 04858, 04859, 04864.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.