Water Quality: Mamaroneck, NY
1 water system • 59,629 people served
Multiple Health ViolationsWater Quality Summary
Mamaroneck is served by 1 public water system with a combined service population of 59,629 people, and has 10 EPA Safe Drinking Water Act violations on record. Critically, 5 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Mamaroneck's violation count is 92% below the national average for New York. Contaminants associated with violations include Bromate, Fecal Coliform, Total Haloacetic Acids (HAA5).
Contaminants Found
Probable human carcinogen that increases the risk of kidney and thyroid cancers.
Common source: Ozonation of bromide-containing water; used as flour improver
EPA limit: 0.010 mg/L (10 ppb)
Indicates direct fecal contamination; associated with diarrhea, cramps, nausea, and potential severe illness.
Common source: Human and animal fecal waste
EPA limit: Zero tolerance (any positive triggers violations)
Haloacetic acids are associated with increased cancer risk and potential reproductive and developmental effects.
Common source: Reaction of chlorine disinfectants with organic matter in treated water
EPA limit: 0.060 mg/L (60 ppb)
Water Systems Serving Mamaroneck
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| WESTCHESTER JOINT WATER WORKS | NY5903435 | Surface Water | 59,629 | 10 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in New York
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.