STATE REPORT NH HEALTH VIOLATIONS: 61

New Hampshire Home Safety Profiles by ZIP

282 ZIP codes · 140 water systems · IPC plumbing code

Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData, NWS, State plumbing boards, Rewiring America

ZipCheckup tracks drinking-water and home-safety data for 282 ZIP codes across New Hampshire, covering 140 public water systems that serve about 772,186 people. 68 ZIP codes are mapped to at least one water system with an EPA violation on record.

282
ZIP Codes
140
Water Systems
68
ZIPs with Violations
IPC
Plumbing Code
B · 74
Avg Safety Score
9
ZIPs Mapped to a System Above the Lead Action Level
11%
EPA Radon Zone 1 (county-level potential)
#21
of 50 States
50%
ZIPs Rated A or B
55%
ZIPs with Violations
B
New Hampshire average: 74/100 - ranked #21 of 50 states. 1 points above the national average (73). 50% of ZIP codes scored A or B.

Upper band, statewide: that is where New Hampshire lands on the ZipCheckup scale.

Score Distribution

How New Hampshire's 282 ZIP codes are distributed across safety grades.

0
A
24
B
24
C
0
D
0
F
85-10070-8455-6940-540-39

Home Safety Scores by State

Loading map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

Model 4.0.0 inputs: EPA SDWIS, UCMR5 PFAS, EPA radon zones, annual county AQI •

Top 10 ZIP Codes by Home Safety Score in New Hampshire

Highest Home Safety Scores in the state.

#ZIP CodeCityCountyScoreGrade
1 03055 MilfordHillsborough 83 B
2 03060 NashuaHillsborough 83 B
3 03062 NashuaHillsborough 83 B
4 03063 NashuaHillsborough 83 B
5 03064 NashuaHillsborough 83 B
6 03077 RaymondRockingham 83 B
7 03222 BristolGrafton 83 B
8 03235 FranklinMerrimack 83 B
9 03257 New LondonMerrimack 83 B
10 03264 PlymouthGrafton 83 B

10 Lowest-Scoring ZIP Codes in New Hampshire

#ZIP CodeCityCountyScoreGradeViolations
1 03051 HudsonHillsborough 63 C 4
2 03865 PlaistowRockingham 64 C 4
3 03842 HamptonRockingham 64 C 6
4 03874 SeabrookRockingham 65 C 5
5 03870 RyeRockingham 65 C 4
6 03079 SalemRockingham 65 C 3
7 03885 StrathamRockingham 66 C 2
8 03862 North HamptonRockingham 66 C 2
9 03854 New CastleRockingham 66 C 1
10 03841 HampsteadRockingham 66 C 1

County Rankings

Water quality breakdown by county. 10 counties with data in New Hampshire.

Loading county map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

County-level aggregation of measured ZIP Home Safety Scores • EPA SDWIS, UCMR 5 PFAS, EPA radon zones, EPA AirData

CountyAvg ScoreGradeZIPsBest ZIPWorst ZIP
33001 82 B 19 03246 (82) 03246 (82)
33003 N/A N/A 30 N/A N/A
33005 75 B 27 03431 (83) 03452 (67)
33007 83 B 16 03570 (83) 03570 (83)
33009 83 B 39 03222 (83) 03748 (82)
33011 75 B 40 03055 (83) 03051 (63)
33013 78 B 31 03235 (83) 03275 (66)
33015 68 C 43 03077 (83) 03865 (64)
33017 N/A N/A 20 N/A N/A
33019 N/A N/A 17 N/A N/A

Most Common Contaminants in New Hampshire

Contaminant / RuleCategoryZIPs AffectedViolationsHealth Risk
Stage 1 DBP Rule Treatment Technique 30 44 No
Total Trihalomethanes (TTHM) Disinfection Byproducts 25 46 Yes
Haloacetic Acids (HAA5) Disinfection Byproducts 22 33 Yes
Consumer Confidence Report Rule Reporting 12 26 Yes
Lead and Copper Rule Treatment Technique 9 19 No
Surface Water Treatment Rule Treatment Technique 8 12 No
Barium Inorganic 7 9 Yes
Bromate Disinfection Byproducts 6 7 Yes

Overview

We track multi-source home safety signals for 282 ZIP records across New Hampshire. Home Safety Score model 4.0.0 is published for 48 scored records; missing required evidence suppresses the score.

The EPA snapshots used for this build directly map water systems to 124 ZIP records, covering 140 community water systems that serve approximately 772,186 people.

68 of 124 ZIP codes with a reported violation count in the available EPA record (55%) have recorded EPA violations. 61 health-based violations appear in the available health breakdown.

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 Home Safety Grade Violations Health-Based System
03054 Merrimack B 25 0 Merrimack Village District
03813 Center Conway — 23 0 North Conway Water Pct
03818 Conway — 23 0 Conway Water and Sewer
03860 North Conway — 23 0 North Conway Water Pct
03847 Kearsarge — 22 0 North Conway Water Pct
03229 Contoocook B 21 20 Contoocook Village Pct
03048 Greenville — 17 1 Greenville Water Department
03249 Gilford — 15 1 Gunstock Acres Village District
03045 Goffstown — 12 3 Manchester Water Works
03832 Eaton Center — 11 7 Village District of Eidelweiss

Areas with No Violations

ZIP Code City Home Safety Grade System Population
03031 Amherst — Pennichuck Water Works 88,853
03052 Litchfield C Litchfield 6,920
03060 Nashua B Pennichuck Water Works 88,853
03062 Nashua B Pennichuck Water Works 88,853
03063 Nashua B Pennichuck Water Works 88,853
03064 Nashua B Pennichuck Water Works 88,853
03076 Pelham — Williamsburg 910
03086 Wilton — Wilton Water Works 1,790
03101 Manchester — Manchester Water Works 123,500
03102 Manchester — Manchester Water Works 123,500

Home Safety Score

Average Home Safety Score for New Hampshire: B (74/100) across 48 scored of 282 tracked ZIP records.

Model 4.0.0 uses the canonical components water-compliance, pfas-mcl-screen, radon-zone, annual-aqi across 3 required domains. The sections below provide additional context and do not change that score. Missing required evidence suppresses the score, and a favorable result is not a property-level safety certification.

Lead & Copper

  • Average of reported 90th-percentile lead results: 0.0100 mg/L (EPA action level: 0.015 mg/L)
  • 9 of 82 ZIP codes with known status exceed the EPA lead action level

Radon Risk

  • High risk (Zone 1): 32 ZIP codes (11%)
  • Moderate risk (Zone 2): 250 ZIP codes
  • Low risk (Zone 3): 0 ZIP codes

ZIP Code Reports for New Hampshire

Largest Communities

ZIP Code City Population Safety Grade Violations
03053 Londonderry 156,046 C 2
03106 Hooksett 131,150 C 0
03110 Bedford 128,613 C 0
03045 Goffstown 128,080 — 12
03101 Manchester 123,500 — 0
03102 Manchester 123,500 — 0
03103 Manchester 123,500 C 0
03104 Manchester 123,500 — 0
03109 Manchester 123,500 C 0
03054 Merrimack 114,353 B 25
03031 Amherst 88,853 — 0
03060 Nashua 88,853 B 0
03062 Nashua 88,853 B 0
03063 Nashua 88,853 B 0
03064 Nashua 88,853 B 0
03870 Rye 71,300 C 4
03820 Dover 62,000 — 1
03874 Seabrook 48,063 C 5
03303 Concord 48,015 B 0
03844 Hampton Falls 48,000 — 5

Lowest Published Home Safety Scores

ZIP Code City Score Grade Violations
03051 Hudson 63 C 4
03842 Hampton 64 C 6
03865 Plaistow 64 C 4
03079 Salem 65 C 3
03870 Rye 65 C 4

Highest Published Home Safety Scores

ZIP Code City Score Grade Violations
03055 Milford 83 B 2
03060 Nashua 83 B 0
03062 Nashua 83 B 0
03063 Nashua 83 B 0
03064 Nashua 83 B 0

All 282 ZIP Codes in New Hampshire

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

Largest water systems in New Hampshire

The 12 largest community water systems in New Hampshire, out of 140 in our data.

Show all 12 water systems

Systems with the most violations in New Hampshire

12 systems in New Hampshire with the most recorded EPA violations.

Frequently Asked Questions

Is the water safe to drink in New Hampshire?

New Hampshire has 140 community water systems serving 772,186 people across 282 ZIP codes. There are 228 recorded violations among these water systems, including 61 health-based. 68 of 282 ZIP codes are mapped to at least one water system with a recorded violation.

What plumbing code does New Hampshire follow?

New Hampshire's listed plumbing code type is IPC as of our last review; local jurisdictions may adopt or amend codes. Plumbing work may require a licensed plumber; check state exemptions and local requirements.

Is lead a concern in New Hampshire's drinking water?

9 ZIP codes in New Hampshire are mapped to water systems whose reported 90th-percentile lead result exceeded the EPA action level of 0.015 mg/L.

What is the radon risk in New Hampshire?

11% of ZIP codes in New Hampshire are mapped to counties classified as EPA Radon Zone 1 (highest county-level radon potential).

How to cite this page

APA ZipCheckup. (2026). New Hampshire Home Safety Profiles by ZIP. https://zipcheckup.com/states/new-hampshire/
BibTeX 
@misc{zipcheckup-states-new-hampshire,
  author = {{ZipCheckup}},
  title  = {{New Hampshire Home Safety Profiles by ZIP}},
  year   = {2026},
  url    = {https://zipcheckup.com/states/new-hampshire/}
}

Page version: October 2026.

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