Hollis, NH: 2 Health Violations — 73/100 (2026)
1 ZIP code · 4 water systems · Updated 2026-06-03
In current NH EPA data, Hollis's tap water sits in the high-safety tier.
How Hollis Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Hollis Water
- Your city's water systems recorded 2 violations in the past 5 years.
- Homes built before 1986: 62% — older plumbing may contain lead solder.
- Estimated remediation: $1,900 per household.
- CDC health risk index: 11.54.
Who Supplies Your Water in Hollis
Structurally, Hollis, NH's water supply is divided. Federal data identifies 4 water systems in the area, with 3 providers serving the bulk of residential connections. These utilities operate independently, meaning rate-setting authority and EPA compliance accountability are distributed rather than centralized.
Overview
We track water quality and home safety data for 1 ZIP code in Hollis, New Hampshire, covering 4 community water systems serving approximately 8,530 people.
1 of 1 ZIP code (100%) have recorded EPA violations. 2 health-based violations documented.
Home Safety Score
Average Home Safety Score for Hollis: B (73/100)
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
Hollis water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Hollis
- 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.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Combined Radium | Radionuclides | 4 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 03049 | B | 2 | 2 | Hollis Pines Coop Mhp West |
All ZIP Codes in Hollis
- 03049 [B] — 2 violations ⚠
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 Hollis
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
Top Contaminants in Hollis Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Housing & Infrastructure in Hollis
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
Heavily weighted toward older construction, Hollis's housing stock carries a median build year of 1970. That profile puts a majority of homes in the era when lead-soldered copper plumbing was standard practice.
Over half of homes in Hollis 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 Hollis Homeowners
In Hollis, property wealth outpaces what documented remediation typically demands — the equity burden lands well within the low tier.
Remediation costs in Hollis are relatively low compared to home values. The $950–$3,200 estimated range is a small fraction of median property value. Home values are 71% above the New Hampshire average.
Lead Exposure Risk for Children in Hollis
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.
When older housing represents 62% of the local inventory or aggregate readings approach the federal action level, an in-home check becomes the standard way to translate citywide averages into the specific reality of an individual Hollis address.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Hollis
Within the NFIP's national dataset, Hollis falls in moderate-exposure territory — 5 documented incidents spanning multiple decades, with 100% of local ZIP codes sitting inside FEMA flood boundaries. That combination warrants inclusion in any thorough local water quality review.
Hollis has a moderate flood history with 5 FEMA claims averaging $1,260 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>$1,900</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 Hollis, NH