Montclair Water Hardness & Quality Report (2026)
Water Hardness
6.6 grains per gallon
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
208.5 mg/L
Est. Daily Cost
$0.30
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 Montclair, your appliances are currently losing 15% efficiency due to mineral buildup.
| Appliance | In Montclair | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.9 yrs | 8.5 yrs | -31% |
| Washing Machine | 9.4 yrs | 12 yrs | -22% |
| Water Heater | 11.1 yrs | 15 yrs | -26% |
Regional Water Comparison
How Montclair compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Montclair, Virginia | 113 mg/L | 5.8 ppt | 🟡 Moderately Hard | reservoir |
| Dale City, Virginia | 91.5 mg/L | 4.6 ppt | 🟡 Moderately Hard | reservoir |
| Cherry Hill, Virginia | 193 mg/L | 10.1 ppt | 🔴 Very Hard | reservoir |
| Lake Ridge, Virginia | 105.5 mg/L | 5.3 ppt | 🟡 Moderately Hard | reservoir |
| Lorton, Virginia | 95 mg/L | 4.8 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Montclair compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Montclair | 113 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Montclair's Water Unique?
Local geology and source profile
Montclair, Virginia, in Prince William County — a planned community in northern Prince William County adjacent to Woodbridge, a large lake-community suburb in the Washington DC southern metro belt — receives its municipal water from the Prince William County Service Authority (PWCSA), which draws from the Occoquan Reservoir through the Griffith and Neabsco water treatment plants serving Prince William County.
The moderately hard 113 mg/L hardness and TDS of 208.5 mg/L reflect the Occoquan watershed's Northern Virginia Piedmont geology. The Occoquan Reservoir collects the Bull Run, Occoquan Creek, and tributary drainage from the Northern Virginia Piedmont — terrain underlain by the Triassic Newark Basin (calcareous red-bed sediment), the Triassic Culpeper Basin fringe, Proterozoic and Cambrian gneiss and granite, and the Jurassic diabase intrusions (Thoroughfare Gap sills). The Triassic calcareous red-bed terrain contributes moderate calcium hardness to the Occoquan, producing the moderately hard Montclair supply — softer than the Potomac River at the Great Falls intake but consistent with the Occoquan south Prince William zone.
At 113 mg/L, Montclair'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 5.8 ppt warrants a certified drinking water filter — Quantico Marine Corps Base (AFFF user in the adjacent Prince William-Stafford County Potomac corridor), the Manassas industrial corridor, and the Northern Virginia defense-technology PFAS complex contribute to Montclair's PFAS readings.
Geology & Source: Montclair in Prince William County draws from the Prince William County Service Authority (PWCSA) on the Occoquan Reservoir (Bull Run-Occoquan watershed) — the Occoquan drains the Northern Virginia Piedmont (Precambrian and Triassic calcareous terrain, Thoroughfare Gap diabase intrusions) — Northern Virginia Piedmont Triassic calcareous watershed drainage produces moderately hard water at 113 mg/L with TDS 209 mg/L in this Prince William County Virginia community.