Gilmanton, NH Water Safety: 63/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
Gilmanton, NH: mid-range safety grade, uneven compliance across service areas.
How Gilmanton Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Gilmanton Water
- Homes built before 1986: 62% — older plumbing may contain lead solder.
- Estimated remediation: $1,600 per household.
- CDC health risk index: 12.77 — above typical levels.
Who Supplies Your Water in Gilmanton
Federal records list 1 water system serving Gilmanton, NH. One provider accounts for the large majority of residential water connections in the area, concentrating infrastructure and compliance accountability.
Overview
We track water quality and home safety data for 1 ZIP code in Gilmanton, New Hampshire, covering 1 community water system serving approximately 2,313 people.
No EPA violations recorded across any ZIP codes in Gilmanton — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Gilmanton: C (63/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Gilmanton water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Gilmanton
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 03237 | C | BELMONT WATER DEPT | 1,612 |
All ZIP Codes in Gilmanton
- 03237 [C]
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Health Outcomes in Gilmanton
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Housing & Infrastructure in Gilmanton
With 62% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
The character of Gilmanton's housing stock is one of deep historical layering — a median build year of 1989 signals a city built largely before the plumbing era changes of 1986 and 1970. Lead-soldered copper joints and, in the oldest properties, lead service lines are commonly present in this inventory. That context shapes what individual water testing may reveal, particularly in neighborhoods where the oldest housing is concentrated.
Over half of homes in Gilmanton were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Cost Context: What Remediation Means for Gilmanton Homeowners
For most homeowners in Gilmanton, the estimated cost of water and safety remediation represents a proportionally modest share of what properties are worth — placing this area in the lower tier of the remediation share scale.
Remediation costs in Gilmanton are relatively low compared to home values. The $800–$2,600 estimated range is a small fraction of median property value. Home values are 13% below the New Hampshire average.
Lead Exposure Risk for Children in Gilmanton
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Confirming what arrives at a specific faucet is something utility-side averages cannot do. With 62% of Gilmanton stock built before the lead-solder ban and citywide monitoring at or beyond the regulatory mark, a tap-level kit fits the standard diligence picture.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Gilmanton
The NFIP has been tracking flood insurance claims across the United States for decades, building a data record that reflects cumulative flood history at the local level. For Gilmanton, that record shows a modest total that places the community on the lower end of flood exposure. That context matters for water quality: flooding can compromise both public treatment infrastructure and private wells, but the severity of those effects depends heavily on event magnitude and frequency. At low claim volumes, those pathways to water quality disruption remain largely theoretical rather than documented local risks.
Gilmanton has a relatively low flood history with 1 FEMA claims on record. While risk is limited, severe weather events can still impact water infrastructure.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$1,600</strong> remediation cost per household.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
What You Can Do in Gilmanton
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. With 62% of homes built before 1986, lead solder is a real possibility.
Deep Dive Reports
Detailed analysis for Gilmanton, NH