Charlestown, MA Water Safety: 65/100 (2026)
1 ZIP code · 2 water systems · Updated 2026-06-03
For most households in Charlestown, MA tap water is adequate — the middle-tier grade reflects gaps in specific service areas.
How Charlestown Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Charlestown Water
- Homes built before 1986: 79% — older plumbing may contain lead solder.
- Estimated remediation: $1,200 per household.
- CDC health risk index: 10.05.
Who Supplies Your Water in Charlestown
Charlestown, MA draws its residential water from 2 separate providers among the 2 federally tracked systems. Each operates independently, with its own infrastructure, rate structure, and compliance record.
Overview
We track water quality and home safety data for 1 ZIP code in Charlestown, Massachusetts (population ~19,994), covering 2 community water systems serving approximately 3,335,647 people region-wide.
No EPA violations recorded across any ZIP codes in Charlestown — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Charlestown: C (65/100)
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
Charlestown water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Charlestown
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 02129 | C | Boston Water and Sewer Commission (mwra) | 675,647 |
All ZIP Codes in Charlestown
- 02129 [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 Charlestown
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 Charlestown
With 79% 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
For residents trying to assess tap water risk in Charlestown, the median build year of 1900 is the starting context. It signals that a majority of homes were constructed before 1986 — the year federal rules prohibited lead solder in new plumbing — and that a significant share likely predates 1970, when lead pipes were still a common choice for residential service connections. Neither risk tier is rare in this housing inventory.
Over half of homes in Charlestown 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 Charlestown Homeowners
Remediation costs in Charlestown are small relative to typical property values — the cost-to-value ratio here is favorable.
Remediation costs in Charlestown are relatively low compared to home values. The $800–$1,800 estimated range is a small fraction of median property value. Home values are 65% above the Massachusetts average.
Lead Exposure Risk for Children in Charlestown
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.
Pulling a tap sample fills the gap that utility data cannot close, particularly here where 79% of housing dates from the pre-rule era and citywide monitoring sits at or above the regulatory mark in Charlestown.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Charlestown
FEMA data shows 100% of Charlestown's ZIP codes mapped into designated flood zones, paired with an NFIP record of 14 claims. That footprint places local flood exposure in the range where it warrants attention without rising to high-severity planning territory.
Charlestown has a moderate flood history with 14 FEMA claims averaging $5,168 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>$1,200</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.
What You Can Do in Charlestown
- 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 79% of homes built before 1986, lead solder is a real possibility.
Deep Dive Reports
Detailed analysis for Charlestown, MA