Mamaroneck, NY Water Safety: 75/100 (2026)
1 ZIP code · 2 water systems · Updated 2026-06-03
Residents of Mamaroneck generally live with tap water that beats the NY safety average on key EPA compliance metrics.
How Mamaroneck Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Mamaroneck Residents
- Average lead level: 0.0045 mg/L.
- Homes built before 1986: 82% — older plumbing may contain lead solder.
- Estimated remediation: $1,800 per household.
- CDC health risk index: 10.47.
Mamaroneck's Water Providers
Water delivery in Mamaroneck, NY is handled by 2 utilities rather than a single system — drawn from 2 providers in federal records, each filing its own compliance reports and setting its own rates.
Overview
We track water quality and home safety data for 1 ZIP code in Mamaroneck, New York (population ~21,022), covering 2 community water systems serving approximately 81,278 people region-wide.
No EPA violations recorded across any ZIP codes in Mamaroneck — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Mamaroneck: 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
Mamaroneck water systems draw from: Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0045 mg/L (EPA action level: 0.015 mg/L)
- 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 |
|---|---|---|---|
| 10543 | B | Westchester Joint Water Works | 59,629 |
All ZIP Codes in Mamaroneck
- 10543 [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.
Mamaroneck Community Health Snapshot
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
Mamaroneck Infrastructure Age
With 82% 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
When more than half a city's housing predates the 1986 federal ban on lead solder, plumbing-era lead risk becomes a citywide concern rather than an exception. Mamaroneck's median build year of 1957 places it squarely in that category.
Over half of homes in Mamaroneck 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.
How Remediation Costs Compare in Mamaroneck
For most homeowners in Mamaroneck, the estimated cost of water and safety remediation represents a proportionally modest share of what properties are worth — placing this area in the lower tier of the remediation share scale.
Remediation costs in Mamaroneck are relatively low compared to home values. The $1,200–$2,500 estimated range is a small fraction of median property value. Home values are 96% above the New York average.
Mamaroneck: Lead Risk & Vulnerable Populations
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.
Older stock in Mamaroneck represents 82% of the inventory, and citywide monitoring runs at or above the federal action level — making an in-home read a standard household-level step.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Mamaroneck: Flood History & Water Damage Risk
What does a high NFIP claim count mean for water quality in Mamaroneck? The 2219 documented claims reflect a flood history frequent enough that those infrastructure degradation pathways — treatment overload, well infiltration, backflow — have almost certainly been periodically activated. That record makes flood timing a relevant factor in local water quality assessment, particularly in the 100% of ZIP codes FEMA has designated as flood zones.
Mamaroneck has a significant flood history with 2,219 FEMA flood insurance claims on record, averaging $29,412 per claim. With 100% of ZIP codes in FEMA-designated flood zones, flood risk is a major concern for homeowners and water quality.
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>$1,800</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 Mamaroneck, NY