Windham, NH Water Safety: 75/100 (2026)
1 ZIP code · 7 water systems · Updated 2026-06-03
In current tracking cycles, Windham records above-average water quality outcomes for NH; compliance history over recent years shows few departures from federal standards and no systemic failures across its water systems.
How Windham Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Windham Water
- Homes built before 1986: 37% — older plumbing may contain lead solder.
- Estimated remediation: $2,200 per household.
- CDC health risk index: 11.66.
Who Supplies Your Water in Windham
Residential water in Windham, NH is supplied by 3 separate utilities — not one centralized authority. Each of those providers operates under its own service territory boundary, maintains its own distribution infrastructure, and files compliance documentation with the EPA on its own timeline. Federal data counts 7 water systems in the area, with these providers collectively accounting for the dominant share of household connections.
Overview
We track water quality and home safety data for 1 ZIP code in Windham, New Hampshire, covering 7 community water systems serving approximately 15,922 people.
No EPA violations recorded across any ZIP codes in Windham — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Windham: B (75/100)
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
Windham water systems draw from: Groundwater, Surface water.
Lead & Copper
- Lead data: not yet available for Windham
- 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 |
|---|---|---|---|
| 03087 | B | W and E | 525 |
All ZIP Codes in Windham
- 03087 [B]
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 Windham
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 Windham
Housing age data helps assess potential lead pipe and infrastructure risks. Newer housing stock generally means lower plumbing-related contamination risk.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Development in Windham unfolded across multiple decades, and the median build year of 1994 reflects a housing inventory where eras of construction are genuinely mixed — including portions that predate the federal prohibition on lead solder in plumbing.
Most homes in Windham were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Cost Context: What Remediation Means for Windham Homeowners
Remediation costs in Windham are small relative to typical property values — the cost-to-value ratio here is favorable.
Remediation costs in Windham are relatively low compared to home values. The $1,200–$3,400 estimated range is a small fraction of median property value. Home values are 88% above the New Hampshire average.
Lead Exposure Risk for Children in Windham
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.
Wherever 37% of local housing was built before solder rules changed — as is the case in Windham — a faucet-level sample closes the gap that aggregate utility data cannot.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Windham
Windham's flood exposure sits in the moderate range: 6 NFIP claims on record and 100% of ZIP codes within FEMA-designated flood zones. Residents with private wells or older infrastructure have reasonable grounds to factor flood timing into their water quality awareness.
Windham has a moderate flood history with 6 FEMA claims averaging $8,435 per payout. 100% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
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>$2,200</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Windham, NH