Maine
Water quality data from the EPA Safe Drinking Water Information System
Water Systems
6,141
Active public water systems
Population Served
922.4K
Residents with piped water
Lead Violations
32
Systems exceeding 15 ppb
Copper Violations
221
Lead & Copper Rule
Average Lead Level
EPA Action Level: 15 ppb
MCLG (health goal): 0 ppb
Average across 1046 systems with reported lead data.
Violations Detected
253 water systems in Maine have reported violations under the Lead and Copper Rule. These utilities are required to notify customers and take corrective action.
Water Systems: Highest Lead Levels
| System Name | City | Population | Lead Level | Status | Sample Date |
|---|---|---|---|---|---|
| BANGOR | 27,298 | 7.45 ppb | OK | 2025-12-31 | |
| LISBON | 17,245 | 6.20 ppb | OK | 2023-12-31 | |
| POLAND | 21,315 | 4.50 ppb | OK | 2025-12-31 | |
| SANFORD | 14,328 | 3.00 ppb | OK | 2023-12-31 | |
| LEWISTON | 23,720 | 2.30 ppb | OK | 2023-12-31 | |
| KITTERY | 14,478 | 2.00 ppb | OK | 2025-12-31 | |
| YORK | 13,675 | 2.00 ppb | OK | 2025-12-31 | |
| PORTLAND | 135,068 | 1.90 ppb | OK | 2023-12-31 | |
| WATERVILLE | 22,060 | 1.87 ppb | OK | 2024-12-31 | |
| AUGUSTA | 13,750 | 1.10 ppb | OK | 2025-12-31 | |
| KENNEBUNK | 35,663 | 1.00 ppb | OK | 2023-12-31 | |
| POLAND | 42,508 | 0.00 ppb | OK | 2024-12-31 | |
| TOPSHAM | 18,250 | 0.00 ppb | OK | 2025-12-31 |
Showing top 13 of 1036 systems with lead data. Action level: 15 ppb.
Systems With Active Violations
These water systems have exceeded EPA limits and must take corrective action.
LEWISTON · Pop. 23,720
Lead: 2.30 ppb (2023-12-31)
WATERVILLE · Pop. 22,060
Lead: 1.87 ppb (2024-12-31)
SANFORD · Pop. 14,328
Lead: 3.00 ppb (2023-12-31)
Water Source Types
Air Quality
GoodAvg AQI
36.5
PM2.5
5 µg/m³
Unhealthy Days
1
Primary Pollutant
PM2.5
Source: EPA AirNow & American Lung Association 2024 State of the Air. AQI scale: 0–50 Good · 51–100 Moderate · 101–150 Sensitive Groups · 151+ Unhealthy.
PFAS Contamination
Moderate DetectionPFAS (per- and polyfluoroalkyl substances), known as “forever chemicals,” are a group of synthetic chemicals that persist indefinitely in the environment and human body. The EPA set a maximum contaminant level (MCL) of 4 parts per trillion (ppt) for PFOA and PFOS in April 2024. View national PFAS tracker →
Systems Tested
132
PFAS Detected
54
Detection Rate
40.9%
Exceeding MCL (4 ppt)
12(9.1%)
Highest recorded level: 35 ppt (EPA MCL: 4 ppt). State has own MCL standards. Sludge spreading from paper mills has caused widespread contamination