New Hampshire — 1st District
119th Congress · 114 ZIP codes · Avg score 64/100 · Grade C · Updated 2026-07-17
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-17
ZipCheckup tracks water safety for 114 ZIP codes in New Hampshire's 1st District: the district earns a grade C (64/100). 432 EPA violations on record, 140 health-based.
Top Contaminants
ZIP Codes in This District
100 ZIP codes tracked in New Hampshire's 1st District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 03247 | Laconia | 83 | B | 1 |
| 2 | 03821 | Dover | 83 | B | 1 |
| 3 | 03822 | Dover | 83 | B | 1 |
| 4 | 03841 | Hampstead | 83 | B | 1 |
| 5 | 03802 | Portsmouth | 82 | B | 3 (1 health) |
| 6 | 03803 | Portsmouth | 82 | B | 3 (1 health) |
| 7 | 03804 | Portsmouth | 82 | B | 3 (1 health) |
| 8 | 03843 | Hampton | 82 | B | 5 (1 health) |
| 9 | 03839 | Rochester | 81 | B | 14 (2 health) |
| 10 | 03866 | Rochester | 81 | B | 14 (2 health) |
| 11 | 03868 | Rochester | 81 | B | 14 (2 health) |
| 12 | 03101 | Manchester | 80 | B | 9 (3 health) |
| 13 | 03109 | Manchester | 80 | B | 9 (3 health) |
| 14 | 03105 | Manchester | 79 | B | 9 (3 health) |
| 15 | 03107 | Manchester | 79 | B | 9 (3 health) |
| 16 | 03108 | Manchester | 79 | B | 9 (3 health) |
| 17 | 03111 | Manchester | 79 | B | 9 (3 health) |
| 18 | 03106 | Hooksett | 78 | B | 0 |
| 19 | 03246 | Laconia | 78 | B | 1 |
| 20 | 03253 | Meredith | 78 | B | 6 (3 health) |
| 21 | 03820 | Dover | 78 | B | 1 |
| 22 | 03824 | Durham | 78 | B | 1 |
| 23 | 03857 | Newmarket | 78 | B | 0 |
| 24 | 03801 | Portsmouth | 77 | B | 3 (1 health) |
| 25 | 03053 | Londonderry | 76 | B | 5 (2 health) |
| 26 | 03867 | Rochester | 76 | B | 14 (2 health) |
| 27 | 03032 | Auburn | 75 | B | 0 |
| 28 | 03036 | Chester | 75 | B | 1 |
| 29 | 03102 | Manchester | 75 | B | 9 (3 health) |
| 30 | 03103 | Manchester | 75 | B | 9 (3 health) |
| 31 | 03104 | Manchester | 75 | B | 9 (3 health) |
| 32 | 03218 | Barnstead | 75 | B | 0 |
| 33 | 03252 | Lochmere | 75 | B | 1 |
| 34 | 03269 | Sanbornton | 75 | B | 1 |
| 35 | 03827 | East Kingston | 75 | B | 0 |
| 36 | 03835 | Farmington | 75 | B | 0 |
| 37 | 03844 | Hampton Falls | 75 | B | 0 |
| 38 | 03856 | Newfields | 75 | B | 0 |
| 39 | 03873 | Sandown | 75 | B | 0 |
| 40 | 03034 | Candia | 74 | B | 2 |
| 41 | 03884 | Strafford | 74 | B | 2 |
| 42 | 03249 | Gilford | 73 | B | 14 (2 health) |
| 43 | 03825 | Barrington | 73 | B | 1 |
| 44 | 03855 | New Durham | 73 | B | 21 (2 health) |
| 45 | 03054 | Merrimack | 72 | B | 2 |
| 46 | 03833 | Exeter | 72 | B | 2 |
| 47 | 03858 | Newton | 72 | B | 0 |
| 48 | 03298 | Tilton | 71 | B | 2 |
| 49 | 03299 | Tilton | 71 | B | 2 |
| 50 | 03861 | Lee | 71 | B | 2 (1 health) |
Overview
New Hampshire's 1st District encompasses 114 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (64/100).
432 EPA violations have been recorded across this district's water systems. 140 are health-based violations. About 68% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Consumer Confidence Report Rule - 117 violations
- Stage 1 DBP Rule - 79 violations
- Lead and Copper Rule - 60 violations
- Total Trihalomethanes (TTHM) - 47 violations
- Surface Water Treatment Rule - 30 violations
Housing Context
Homes in this district were built on average around 1980 (~46 years old). Older homes may have lead pipes or solder - consider a water filter if your home predates 1986.
Lead Alert: 13 ZIP codes in this district exceed the EPA action level for lead. Consider using a certified lead-removal filter.
Data Sources
- Water quality violations: EPA Safe Drinking Water Information System (SDWIS)
- Congressional district boundaries: U.S. Census Bureau, 119th Congress
- Housing age: U.S. Census Bureau American Community Survey
Updated daily. Data covers 114 ZIP codes in New Hampshire's 1st District.