Twin Mountain, NH Water Safety: 72/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
Drinking water tracked for Twin Mountain by NH authorities posts above-average scores — the majority of systems are free from health-based exceedances and the city's grade sits above the state median.
How Twin Mountain Compares
Data: EPA SDWIS Last verified: 2026-06-03
Twin Mountain Water: The Quick Version
- Homes built before 1986: 67% — older plumbing may contain lead solder.
- Estimated remediation: $400 per household.
- CDC health risk index: 14.55 — above typical levels.
Water Systems Serving Twin Mountain
Supply infrastructure in Twin Mountain, NH runs through a single dominant provider — the main entity among 1 tracked system through which rate decisions, infrastructure work, and federal compliance are managed.
Overview
We track water quality and home safety data for 1 ZIP code in Twin Mountain, New Hampshire, covering 1 community water system serving approximately 715 people.
No EPA violations recorded across any ZIP codes in Twin Mountain — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Twin Mountain: B (72/100)
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
Twin Mountain water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Twin Mountain
- 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 |
|---|---|---|---|
| 03595 | B | Carroll Water Works | 875 |
All ZIP Codes in Twin Mountain
- 03595 [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.
CDC Health Data for Twin Mountain
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
How Old Is Twin Mountain's Housing Stock?
With 67% 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 median home in Twin Mountain was built in 1977 — a figure that places most of the city's residential stock in the era when lead solder was still standard in copper plumbing. Homes built before 1986 may have lead-soldered joints; those built before 1970 face the additional possibility of lead pipes in the service line itself.
Over half of homes in Twin Mountain 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.
Twin Mountain: Remediation Cost in Perspective
What does remediation cost in financial context for Twin Mountain homeowners? Proportionally very little — the equity share here is low, and addressing documented issues is a manageable planning question rather than a material financial burden.
Remediation costs in Twin Mountain are relatively low compared to home values. The $0–$800 estimated range is a small fraction of median property value. Home values are 37% below the New Hampshire average.
Protecting Children from Lead in Twin Mountain
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.
Despite citywide averages serving as the standard public reference point, those aggregates cannot resolve what is happening at one specific faucet — and where 67% of Twin Mountain homes come from before the solder rule or where utility samples sit at or above the action mark, the gap between system data and faucet reality matters more than it does in lower-exposure communities. An in-home draw closes that gap, with certified filtration through retailer networks available where confirmed faucet results warrant additional measures.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Deep Dive Reports
Detailed analysis for Twin Mountain, NH