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Maine Water Quality
121
Utilities in database
0.7M
Residents served
48%
On private wells
2
Key contaminants tracked
Drinking Water in Maine
Maine has 121 community water systems serving approximately 0.7 million residents. Primary water sources include groundwater. The most commonly reported contaminants include lead, nitrates. 48% of Maine residents rely on private wells. DHHS holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Maine
26–50 of 121Maine Water Company Millinocket Division
ME0090990 · 5,400 served
Houlton Water Company
ME0090700 · 4,735 served
Hampden Water District
ME0090660 · 4,628 served
Town of Bar Harbor- Water Division
ME0090120 · 4,443 served
Rumford Water District
ME0091380 · 4,050 served
Farmington Village Corp Water Dept
ME0090540 · 4,050 served
Caribou Utilities District
ME0090320 · 3,943 served
Ellsworth Water Department
ME0090520 · 3,910 served
South Berwick Water District
ME0091470 · 3,722 served
Bridgton Water District
ME0090230 · 3,660 served
Lake Arrowhead Community Inc
ME0090811 · 3,500 served
Pittsfield Water Dept
ME0091280 · 3,228 served
Lincoln Water District
ME0090860 · 3,020 served
Livermore Falls Water District
ME0090880 · 2,995 served
Paris Utility District
ME0091230 · 2,940 served
Maine Water Company Oakland Division
ME0091190 · 2,873 served
Berwick Water Department
ME0090150 · 2,845 served
Wilton Water Department
ME0091620 · 2,800 served
Calais Water Dept
ME0090290 · 2,775 served
Searsport Water District
ME0091440 · 2,763 served
Winthrop Utilities District
ME0091650 · 2,750 served
Madawaska Water District
ME0090920 · 2,738 served
Maine Water Company Freeport Division
ME0090580 · 2,700 served
Southwest Harbor Water & Sewer District
ME0091490 · 2,480 served
Gray Water District
ME0090620 · 2,468 served
Key Contaminant Concerns in Maine
Lead
Lead is a naturally occurring heavy metal that was widely used in plumbing infrastructure until it was banned for new installations in 1986. An estimated 9.2 million lead service lines still connect homes to public water mains across the United States, along with millions of homes with lead solder in their internal plumbing.
Nitrates
Nitrate (NO₃⁻) is a nitrogen-containing compound that forms naturally through the decomposition of organic matter. At elevated concentrations — almost always from human activity — nitrate interferes with the blood's ability to carry oxygen. The United States produces over 23 million tons of nitrogen fertilizer annually, making agricultural runoff the dominant source of nitrate contamination.
Maine Water FAQs
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Data source: Utility data from EPA SDWIS. 121 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-23