Mamaroneck Water Hardness & Quality Report (2026)
Water Hardness
8.6 grains per gallon
Source
reservoir
pH Level
8
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
351.6 mg/L
Est. Daily Cost
$0.39
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Mamaroneck, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Mamaroneck | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.7 yrs | 8.5 yrs | -45% |
| Washing Machine | 8.1 yrs | 12 yrs | -33% |
| Water Heater | 9.7 yrs | 15 yrs | -35% |
Regional Water Comparison
How Mamaroneck compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mamaroneck, New York | 148 mg/L | 7.1 ppt | 🟠 Hard | reservoir |
| Harrison, New York | 126 mg/L | 6.1 ppt | 🟠 Hard | reservoir |
| Rye, New York | 86.5 mg/L | 4.2 ppt | 🟡 Moderately Hard | reservoir |
| New Rochelle, New York | 158 mg/L | 7.6 ppt | 🟠 Hard | reservoir |
| Wykagyl, New York | 92.5 mg/L | 4.5 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Mamaroneck compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mamaroneck | 148 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Mamaroneck's Water Unique?
Local geology and source profile
Mamaroneck, New York, in Westchester County — a Westchester County town on the Mamaroneck River estuary on Long Island Sound, adjacent to Larchmont and New Rochelle, a Long Island Sound suburban community in the southern Westchester corridor — receives its municipal water from the Village of Mamaroneck Water Department or Westchester Joint Water Works, drawing from the Kensico Reservoir (NYC DEP Catskill-Delaware terminal reservoir, north Westchester County) or the Westchester County water system.
The moderately hard 148 mg/L hardness and TDS of 351.6 mg/L are somewhat harder than the typical pure NYC DEP Catskill-Delaware supply (Eastchester: 63.5 mg/L, TDS 95) — indicating that Mamaroneck draws from the Kensico Reservoir zone or a Westchester County distribution blend with additional mineral contribution from the Westchester Highlands limestone terrain. The Westchester Joint Water Works serves multiple communities with Kensico-area supply that has picked up additional hardness from local Cambrian dolomite and Ordovician limestone intrusion in the Westchester distribution area.
At 148 mg/L, Mamaroneck's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 7.1 ppt warrants a certified drinking water filter — the Westchester County aviation corridor (Westchester County Airport — aviation PFAS-AFFF), the Tuckahoe industrial-chemical corridor, and the NYC-Westchester metro PFAS complex contribute to Mamaroneck's elevated readings.
Geology & Source: Mamaroneck in Westchester County draws from the Village of Mamaroneck Water Department or Westchester Joint Water Works on the Kensico Reservoir (NYC DEP system, Westchester County) — the Kensico watershed drains Proterozoic gneiss and Cambrian metamorphic terrain of the Westchester Highlands — NYC DEP Catskill-Delaware-Kensico terminal reservoir produces moderately hard water at 148 mg/L with TDS 352 mg/L in this Westchester County New York town.