Monsey Water Hardness & Quality Report (2026)
Water Hardness
6 grains per gallon
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
195.7 mg/L
Est. Daily Cost
$0.27
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 Monsey, your appliances are currently losing 14% efficiency due to mineral buildup.
| Appliance | In Monsey | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.2 yrs | 8.5 yrs | -27% |
| Washing Machine | 9.8 yrs | 12 yrs | -18% |
| Water Heater | 11.5 yrs | 15 yrs | -23% |
Regional Water Comparison
How Monsey compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Monsey, New York | 102.5 mg/L | 5 ppt | 🟡 Moderately Hard | reservoir |
| Spring Valley, New York | 177 mg/L | 8.5 ppt | 🟠 Hard | reservoir |
| Nanuet, New York | 145 mg/L | 7 ppt | 🟠 Hard | reservoir |
| Pearl River, New York | 142.5 mg/L | 6.8 ppt | 🟠 Hard | reservoir |
| Mahwah, New Jersey | 43 mg/L | 5.4 ppt | 🟢 Soft | reservoir |
National Benchmark
How Monsey compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Monsey | 102.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Monsey's Water Unique?
Local geology and source profile
Monsey, New York, in Rockland County — an unincorporated Rockland County hamlet adjacent to Spring Valley and New Square, in the south Rockland County corridor — receives its municipal water from Suez Water Rockland (formerly United Water Rockland), drawing from the Rockland County reservoir system in the Harriman-Ramapo Mountains and from the Hackensack River watershed supply.
The moderately hard 102.5 mg/L hardness and TDS of 195.7 mg/L reflect the Rockland County supply's Hudson Highlands and Ramapo Mountains character. The Rockland County reservoirs drain the Hudson Highlands (Precambrian Storm King Granite and Gneiss — insoluble crystalline), the Ramapo Mountains (Precambrian Reading Prong gneiss — insoluble), and the Triassic Newark Basin margin (calcareous — minor hardness contributor). The moderately hard reading reflects the Rockland County supply's blend of soft Highlands reservoir water with slightly more mineralized lowland sources.
At 102.5 mg/L, Monsey'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 5.0 ppt warrants a certified drinking water filter — the Rockland County industrial corridor (Haverstraw-West Nyack chemical plants), the Stewart Air National Guard Base (Orange County — AFFF in the Hudson-Ramapo watershed), and the Lower Hudson Valley PFAS background contribute to Monsey's readings.
Geology & Source: Monsey in Rockland County draws from United Water Rockland (now Suez Water NY) on the Hackensack River watershed (Rockland County, Harriman State Park area) — the Rockland County reservoirs drain the Hudson Highlands (Precambrian Storm King Granite-Gneiss) — New York Hudson Highlands Precambrian crystalline watershed produces moderately hard water at 102.5 mg/L with TDS 196 mg/L in this Rockland County New York community.