Dale City Water Hardness & Quality Report (2026)
Water Hardness
5.3 grains per gallon
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
149.4 mg/L
Est. Daily Cost
$0.24
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 Dale City, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In Dale City | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.6 yrs | 8.5 yrs | -22% |
| Washing Machine | 10.2 yrs | 12 yrs | -15% |
| Water Heater | 11.9 yrs | 15 yrs | -21% |
Regional Water Comparison
How Dale City compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Dale City, Virginia | 91.5 mg/L | 4.6 ppt | 🟡 Moderately Hard | reservoir |
| Montclair, Virginia | 113 mg/L | 5.8 ppt | 🟡 Moderately Hard | reservoir |
| Lake Ridge, Virginia | 105.5 mg/L | 5.3 ppt | 🟡 Moderately Hard | reservoir |
| Cherry Hill, Virginia | 193 mg/L | 10.1 ppt | 🔴 Very Hard | reservoir |
| Lorton, Virginia | 95 mg/L | 4.8 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Dale City compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Dale City | 91.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Dale City's Water Unique?
Local geology and source profile
Dale City, Virginia, an unincorporated community in Prince William County in Northern Virginia (adjacent to Woodbridge and the Potomac River) — one of Virginia's largest unincorporated communities and a major Northern Virginia suburban center — draws its municipal water supply from the Occoquan Reservoir (Bull Run–Occoquan watershed in Prince William–Fairfax Counties) via the Prince William County Service Authority (PWCSA), treating Occoquan Reservoir water at the Occoquan water treatment plant. Water hardness in Dale City measures 91.5 mg/L — classified as moderately soft.
Dale City's soft supply reflects the Occoquan–Bull Run watershed's geology in southern Prince William County. The Bull Run–Occoquan watershed in the lower Prince William County reach drains the Piedmont crystalline basement — the Precambrian–Cambrian Chopawamsic Formation (mafic volcanic arc metavolcanic rocks — calcium-poor), Quantico Formation (phyllite and quartzite — siliceous), and the Stafford Metamorphic Suite. The upper Bull Run extends into the Blue Ridge and the Valley and Ridge (where some calcareous input occurs), but the southern Occoquan watershed near Dale City is dominated by the Piedmont crystalline terrain's soft water drainage. The PWCSA treatment plant produces the 91.5 mg/L soft supply characteristic of the Prince William County Occoquan system.
With hardness at 91.5 mg/L, Dale City residents enjoy moderately soft water with minimal scale challenges. Prince William County Service Authority consistently delivers water meeting all Virginia DEQ and EPA Safe Drinking Water Act requirements.
Geology & Source: River supply from the Occoquan Reservoir (Bull Run–Occoquan watershed) via the Prince William County Service Authority and Fairfax Water — the Virginia Piedmont Precambrian–Paleozoic crystalline and Blue Ridge–Valley and Ridge drainage of Prince William County; moderately soft supply at 91.5 mg/L in Prince William County.