Maine Water Quality & Safety Report
27 ZIP codes · 70 water systems · IPC plumbing code · Updated 2026-03-16
Data: EPA SDWIS, NWS, State plumbing boards, Rewiring America Last verified: 2026-03-16
Overview
We track water quality, weather alerts, plumbing regulations, and energy rebates for 27 ZIP codes across Maine, covering 70 community water systems that serve approximately 284,762 people.
22 of 27 ZIP codes (81%) have recorded EPA violations. 29 health-based violations have been documented.
Active Weather Alerts
4 active alerts in Maine including 2 warnings. Severe weather can directly affect tap water quality — flooding, power outages, and infrastructure damage may lead to boil-water advisories.
| Alert | Severity | Areas |
|---|---|---|
| Flood Watch | Severe | Northern Penobscot; Southeast Aroostook; Central Piscataq… |
| High Wind Warning | Severe | Southern Penobscot; Interior Hancock; Central Washington |
| High Wind Warning | Severe | Coastal Hancock; Coastal Washington |
| Flood Watch | Severe | Northern Oxford; Northern Franklin; Central Somerset; Sou… |
Plumbing Regulations
Maine follows the Maine Internal Plumbing Code (based on IPC) (2015 edition).
- Plumbing code: IPC (2015)
- Homeowner DIY: Licensed plumber required
- Water heater permit: Required
- Annual backflow test: Required
Energy & Water Rebates
Across 27 tracked ZIP codes in Maine, residents have access to an average of 4 water-related rebate programs — including incentives for heat pump water heaters, efficient fixtures, and plumbing upgrades.
Check rebates for your ZIP code →
Areas with Most Violations
| ZIP Code | City | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|---|
| 04901 | Waterville | — | 94 | 1 | KENNEBEC WATER DISTRICT |
| 04101 | Portland | — | 31 | 3 | PORTLAND WATER DISTRICT-GREATER |
| 04920 | Bingham | — | 22 | 0 | MOSCOW WATER DISTRICT |
| 04092 | Westbrook | — | 18 | 4 | 322 ROOSEVELT TRAIL |
| 04614 | Blue Hill | — | 18 | 5 | PARKER RIDGE RETIREMENT COMMUNITY |
| 04750 | Limestone | — | 18 | 7 | LIMESTONE WATER & SEWER DISTRICT |
| 04420 | Castine | — | 17 | 3 | CASTINE WATER DEPARTMENT |
| 03901 | Berwick | — | 12 | 2 | BERWICK WATER DEPARTMENT |
| 04210 | Auburn | — | 11 | 0 | AUBURN WATER DISTRICT |
| 04070 | Scarborough | — | 9 | 0 | POND ACRES LLC |
Areas with No Violations
| ZIP Code | City | Safety Score | System | Population |
|---|---|---|---|---|
| 04032 | Freeport | — | MAINE WATER COMPANY FREEPORT DIVISION | 2,700 |
| 04216 | Andover | — | ANDOVER WATER DISTRICT | 265 |
| 04537 | Boothbay | — | BOOTHBAY REGION WATER DISTRICT | 8,448 |
| 04609 | Bar Harbor | — | TOWN OF BAR HARBOR- WATER DIVISION | 4,443 |
| 04732 | Ashland | — | ASHLAND WATER & SEWER DISTRICT | 713 |
Lead & Copper
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
- High risk (Zone 1): 0 ZIP codes (0%)
- Moderate risk (Zone 2): 0 ZIP codes
- Low risk (Zone 3): 0 ZIP codes
All 27 ZIP Codes in Maine
- 04606 (Addison) — 2 violations
- 04002 (Alfred) — 4 violations
- 04216 (Andover)
- 04911 (Anson) — 4 violations
- 04732 (Ashland)
- 04210 (Auburn) — 11 violations
- 04330 (Augusta) — 3 violations
- 04401 (Bangor) — 5 violations
- 04609 (Bar Harbor)
- 04530 (Bath) — 1 violation
- 04915 (Belfast) — 9 violations ⚠
- 03901 (Berwick) — 12 violations ⚠
- 04217 (Bethel) — 8 violations
- 04005 (Biddeford) — 1 violation
- 04920 (Bingham) — 22 violations
- 04614 (Blue Hill) — 18 violations ⚠
- 04537 (Boothbay)
- 04420 (Castine) — 17 violations ⚠
- 04032 (Freeport)
- 04240 (Lewiston) — 2 violations
- 04750 (Limestone) — 18 violations ⚠
- 04954 (New Portland) — 3 violations
- 04469 (Orono) — 2 violations
- 04101 (Portland) — 31 violations ⚠
- 04070 (Scarborough) — 9 violations
- 04901 (Waterville) — 94 violations ⚠
- 04092 (Westbrook) — 18 violations ⚠
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Weather alerts: National Weather Service (NWS)
- Regulations: State plumbing boards, ICC, IAPMO
- Rebates: Rewiring America
Updated daily.