Water quality for ZIP code 04421
ZIP 04421 covers Castine in Hancock County, Maine, one of 40 ZIP codes in the county. 206 active public water systems serve the county; 135 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Hancock County
29 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Castine Water Department Castine |
983 | 0 | 1.4 mi | |
| South Penobscot Water Association Penobscot |
38 | 3 | 7.4 mi | |
| Benjamin River Apts Sedgwick |
45 | 1 | 9.9 mi | |
| Parker Ridge Retirement Community Blue Hill |
120 | 2 | 11.6 mi | |
| Harbor View I & II Blue Hill |
40 | 1 | 11.8 mi | |
| Blue Hill Terrace Blue Hill |
60 | 3 | 12.2 mi | |
| Maine Water Company Bucksport Division Bucksport |
1,700 | 0 | 12.3 mi | |
| Harriman Cove Park LLC Bucksport |
45 | 1 | 12.4 mi | |
| Silver Lake Estates Bucksport |
110 | 0 | 12.9 mi | |
| Sherwood Forest MHP Bucksport |
68 | 3 | 18.4 mi | |
| Ellsworth Water Department Ellsworth |
3,910 | 3 | 19.7 mi | |
| Stonington Manor Stonington |
44 | 1 | 19.7 mi | |
| Birch Haven Trailer Park Hancock |
43 | 7 | 22.0 mi | |
| Cold Spring Water Company Lamoine |
305 | 2 | 22.8 mi | |
| Sun Hancock Heights East Hancock |
158 | 0 | 23.5 mi | |
| Crescent Mobile Home Park Hancock |
55 | 1 | 23.9 mi | |
| Stonington Water Company Stonington |
683 | 2 | 24.4 mi | |
| Southwest Harbor Water & Sewer District Southwest Hbr |
2,480 | 1 | 26.3 mi | |
| Mount Desert Water Dist North Mount Desert |
1,623 | 3 | 26.6 mi | |
| Birch Tree Meadows MHP Hancock |
105 | 3 | 26.7 mi | |
| Mount Desert Water Dist -Seal Mount Desert |
865 | 2 | 27.3 mi | |
| Sun Hancock Heights-West Hancock |
155 | 0 | 27.3 mi | |
| Coastal Estates Hancock |
48 | 0 | 27.3 mi | |
| Town of Bar Harbor Water Division Bar Harbor |
4,443 | 0 | 29.0 mi | |
| Franklin Water Department Franklin |
420 | 4 | 31.6 mi |
Non-community systems in Hancock County (176: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Hancock County, the county this ZIP code lies in, nearest to the ZIP code's centre first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau county subdivision files or the centre of the first town EPA lists the system as serving, from Census Bureau place files.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Maine records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.