New Hampshire Water Quality & Safety Report
41 ZIP codes · 130 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 41 ZIP codes across New Hampshire, covering 130 community water systems that serve approximately 487,178 people.
23 of 41 ZIP codes (56%) have recorded EPA violations. 89 health-based violations have been documented.
Active Weather Alerts
1 active alert in New Hampshire. 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 Oxford; Northern Franklin; Central Somerset; Sou… |
View all New Hampshire alerts →
Plumbing Regulations
New Hampshire follows the International Plumbing Code (2018 edition).
- Plumbing code: IPC (2018)
- Homeowner DIY: Licensed plumber required
- Water heater permit: Required
- Annual backflow test: Required
Full New Hampshire regulations →
Areas with Most Violations
| ZIP Code | City | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|---|
| 03741 | Canaan | — | 44 | 2 | CANAAN WATER DEPT |
| 03216 | Andover | — | 37 | 26 | ANDOVER VILLAGE DIST |
| 03301 | Concord | — | 28 | 25 | CONCORD WATER DEPT |
| 03811 | Atkinson | — | 18 | 14 | HAMPSTEAD AREA WATER |
| 03574 | Bethlehem | — | 14 | 14 | BETHLEHEM VILLAGE DIST |
| 03246 | Laconia | — | 9 | 0 | LACONIA WATER WORKS |
| 03814 | Center Ossipee | — | 6 | 0 | OSSIPEE WATER DEPT |
| 03034 | Candia | — | 5 | 0 | COUNTRY LANE MANOR |
| 03756 | Lebanon | — | 5 | 3 | LEBANON WATER DEPT |
| 03801 | Portsmouth | — | 5 | 2 | PORTSMOUTH WATER WORKS |
Areas with No Violations
| ZIP Code | City | Safety Score | System | Population |
|---|---|---|---|---|
| 03032 | Auburn | — | THE CLIFFS AT EVERGREEN | 25 |
| 03060 | Nashua | — | PENNICHUCK WATER WORKS | 89,073 |
| 03215 | Waterville Valley | — | WATERVILLE VALLEY WATER DIST | 3,150 |
| 03217 | Ashland | — | ASHLAND WATER DEPT | 1,525 |
| 03218 | Barnstead | — | LOCKE LAKE | 2,278 |
| 03220 | Belmont | — | BELMONT WATER DEPT | 1,612 |
| 03221 | Bradford | — | FISHERFIELD TOWNHOUSES | 40 |
| 03222 | Bristol | — | BRISTOL WATER WORKS | 3,575 |
| 03224 | Canterbury | — | CANTERBURY SPRUCES HOUSING | 25 |
| 03226 | Center Harbor | — | PATRICIAN SHORES | 225 |
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 41 ZIP Codes in New Hampshire
- 03602 (Alstead)
- 03809 (Alton)
- 03031 (Amherst) — 1 violation
- 03216 (Andover) — 37 violations ⚠
- 03440 (Antrim)
- 03217 (Ashland)
- 03811 (Atkinson) — 18 violations ⚠
- 03032 (Auburn)
- 03218 (Barnstead)
- 03825 (Barrington)
- 03812 (Bartlett)
- 03740 (Bath) — 3 violations
- 03220 (Belmont)
- 03442 (Bennington)
- 03570 (Berlin) — 1 violation
- 03574 (Bethlehem) — 14 violations ⚠
- 03221 (Bradford)
- 03222 (Bristol)
- 03223 (Campton) — 2 violations
- 03741 (Canaan) — 44 violations ⚠
- 03034 (Candia) — 5 violations
- 03224 (Canterbury)
- 03813 (Center Conway) — 1 violation
- 03226 (Center Harbor)
- 03814 (Center Ossipee) — 6 violations
- 03603 (Charlestown) — 3 violations
- 03036 (Chester) — 1 violation
- 03817 (Chocorua)
- 03301 (Concord) — 28 violations ⚠
- 03820 (Dover) — 1 violation
- 03842 (Hampton) — 5 violations ⚠
- 03431 (Keene) — 1 violation
- 03246 (Laconia) — 9 violations
- 03756 (Lebanon) — 5 violations ⚠
- 03101 (Manchester) — 1 violation
- 03060 (Nashua)
- 03801 (Portsmouth) — 5 violations ⚠
- 03839 (Rochester) — 3 violations ⚠
- 03285 (Thornton)
- 03276 (Tilton) — 2 violations
- 03215 (Waterville Valley)
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.