Madbury, NH: Lead Above EPA Limits — 46/100 (2026)
1 ZIP code · 3 water systems · Updated 2026-06-03
A meaningful share of water systems in Madbury have recorded health-based violations in recent NH monitoring periods — placing the city in the lower tier for tap water safety.
How Madbury Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Madbury Water
- Your city's water systems recorded 15 violations in the past 5 years.
- Average lead level: 0.028 mg/L — exceeds the EPA action level of 0.015 mg/L.
- Homes built before 1986: 54% — older plumbing may contain lead solder.
- Estimated remediation: $4,840 per household.
- CDC health risk index: 11.41.
Who Supplies Your Water in Madbury
Residential water service in Madbury, NH is divided among 3 separate utilities, drawn from 3 systems on file with federal regulators.
Overview
We track water quality and home safety data for 1 ZIP code in Madbury, New Hampshire (population ~2,121), covering 3 community water systems serving approximately 29,120 people region-wide.
1 of 1 ZIP code (100%) have recorded EPA violations. 3 health-based violations documented.
Home Safety Score
Average Home Safety Score for Madbury: D (46/100)
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
Madbury water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0280 mg/L (exceeds EPA action level) (EPA action level: 0.015 mg/L)
- 1 ZIP code 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 |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting | 12 | 1 |
| Lead and Copper Rule | Treatment Technique | 10 | 1 |
| Contaminant 0700 | Other | 4 | 1 |
| Stage 1 DBP Rule | Treatment Technique | 2 | 1 |
| Surface Water Treatment Rule | Treatment Technique | 2 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 03823 | D | 15 | 3 | Dover Water Department |
All ZIP Codes in Madbury
- 03823 [D] — 15 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 Madbury
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 Madbury Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Housing & Infrastructure in Madbury
With 54% 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 lead that enters tap water in older homes often comes not from the municipal supply but from the home's own plumbing — from solder used in copper joints before the 1986 federal ban, or from lead pipes installed before 1970. In Madbury, where the median build year is 1985, these older materials are widespread. More than half the residential stock predates the 1986 solder ban, and a significant fraction predates 1970 as well. For residents in those homes, the city-wide water quality picture is a less relevant frame than the specific materials inside their own walls and under their own street.
Over half of homes in Madbury 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 Madbury Homeowners
For most Madbury homeowners, estimated remediation represents a moderate equity share — manageable with planning.
Remediation costs are moderate relative to home values in Madbury. The estimated $2,860–$7,420 range is manageable for most homeowners but still worth budgeting for. Home values are 26% above the New Hampshire average.
Lead Exposure Risk for Children in Madbury
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.
Children and pregnant residents are the populations for whom CDC guidance places particular weight on minimizing exposure. With 54% of Madbury stock from the pre-rule era and citywide samples past the action mark, household kits and certified filter hardware are available through verified retailer networks.
<strong>1 ZIP code</strong> (100% of the city) exceeds the EPA lead action level of 0.015 mg/L.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
What You Can Do in Madbury
- Test your water at home. City-level data shows averages — your tap may differ. Lead testing is especially recommended given the area's lead levels.
- Install a certified water filter. Filters rated for Consumer Confidence Report Rule can reduce the most common contaminant found in Madbury's water.
- Check your home's plumbing. With 54% of homes built before 1986, lead solder is a real possibility.
- Review your water system's CCR. Your utility publishes an annual Consumer Confidence Report with detailed test results. Request it or find it online.
Deep Dive Reports
Detailed analysis for Madbury, NH