New York · population 19,783
Lead pipes in Mamaroneck, NY
674 lead or galvanized lines to replace
Most of Mamaroneck (population 19,783) gets its water from Westchester Joint Water Works. That system reported 635 lead and 39 galvanized-requiring-replacement service lines out of 15,001, with 9,379 more of unknown material.
4.5% of Westchester Joint Water Works's service lines are lead or galvanized requiring replacement, lower than the New York average (7.6%) and higher than the national average (3.1%).
- Lead 4.2%
- Galvanized (replace) 0.3%
- Unknown 63%
- Non-lead 33%
Latest lead test for Westchester Joint Water Works (Jan 2026–Dec 2028): 3 ppb at the 90th percentile, against a 15 ppb federal action level. Full test history.
Compliance record: EPA lists no Lead and Copper Rule violations since 2015 for Westchester Joint Water Works.
Water systems serving Mamaroneck
| Water system | Lead | Galv. | Unknown | % lead |
|---|---|---|---|---|
| Westchester Joint Water WorksMain system | 635 | 39 | 9,379 | 4.5% |
| Larchmont VillageServes nearby areas | 403 | 0 | 353 | 22% |
Matched from EPA water system service area boundaries and the cities each system reports serving. Edges of the city may be served by a neighboring system; your water bill names your utility.
Check your address in Mamaroneck
The counts above cover the whole water system. To see whether your line is lead, look up your address on Westchester Joint Water Works's official inventory. Utilities had to make these public by October 16, 2024.
No map yet? Do the 2-minute scratch and magnet test.
Protect your drinking water
If your line is lead, galvanized or unknown, use a filter certified to NSF/ANSI 53 for lead for drinking, cooking and baby formula, and use only cold water.
Choosing a lead-certified filter · Testing your water · Replacement cost
Nearby cities
- Larchmont403 lead + galv. lines
- Rye1,009 lead + galv. lines
- New Rochelle8,082 lead + galv. lines
- Pelham8,082 lead + galv. lines
- Scarsdale78 lead + galv. lines
- Pelham Manor8,082 lead + galv. lines
- Tuckahoe8,082 lead + galv. lines
- Bronxville8,082 lead + galv. lines
Check another water system
Questions
Does Mamaroneck, NY have lead pipes?
Yes. Westchester Joint Water Works, which serves Mamaroneck, reported 635 lead and 39 galvanized-requiring-replacement service lines, plus 9,379 of unknown material.
Who supplies water to Mamaroneck?
EPA's service area maps place most of Mamaroneck in Westchester Joint Water Works's service area (PWSID NY5903435). Larchmont Village also serves parts of the city or nearby areas.
How do I check whether my Mamaroneck home has a lead service line?
Search your address on Westchester Joint Water Works's service line inventory map. You can also scratch the pipe where water enters your home: lead is soft, dull gray, scratches to shiny silver and doesn't attract a magnet.
When will lead pipes in Mamaroneck be replaced?
EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask Westchester Joint Water Works whether your street is scheduled and whether it covers the private side.