Coatesville Water Hardness & Quality Report (2026)
Water Hardness
8.2 grains per gallon
Source
reservoir
pH Level
7.9
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
278.8 mg/L
Est. Daily Cost
$0.37
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 Coatesville, your appliances are currently losing 19% efficiency due to mineral buildup.
| Appliance | In Coatesville | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5 yrs | 8.5 yrs | -41% |
| Washing Machine | 8.4 yrs | 12 yrs | -30% |
| Water Heater | 10 yrs | 15 yrs | -33% |
Regional Water Comparison
How Coatesville compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Coatesville, Pennsylvania | 140 mg/L | 7.2 ppt | 🟠 Hard | reservoir |
| West Chester, Pennsylvania | 126.5 mg/L | 6.4 ppt | 🟠 Hard | reservoir |
| Hockessin, Delaware | 166 mg/L | 9.5 ppt | 🟠 Hard | groundwater |
| Newark, Delaware | 81 mg/L | 5.2 ppt | 🟡 Moderately Hard | groundwater |
| Pottstown, Pennsylvania | 118.5 mg/L | 6 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Coatesville compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Coatesville | 140 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Coatesville's Water Unique?
Local geology and source profile
Coatesville, Pennsylvania, in Chester County — a Chester County city adjacent to Downingtown and West Chester on Brandywine Creek in southeast Pennsylvania — receives its water from the Coatesville Area Water, drawing from Brandywine Creek (Chester County) through the southeast Pennsylvania distribution.
The moderately hard 140 mg/L hardness and TDS of 278.8 mg/L reflect the southeast Pennsylvania Chester County Brandywine Creek Piedmont supply's moderate calcareous character — driven by the Cambrian Cockeysville Marble's calcareous contacts in the Chester County Piedmont beneath the insoluble Precambrian Wissahickon Formation, consistent with the southeast Pennsylvania Piedmont communities on the Brandywine watershed. The Brandywine Creek at Chester County — Cambrian Cockeysville Marble (calcareous — primary hardness contributor), Precambrian Wissahickon Formation (insoluble — dilutant), and Ordovician Conestoga Limestone (calcareous — secondary contributor).
At 140 mg/L, Coatesville'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 7.2 ppt warrants a certified drinking water filter — the Chester County southeast Pennsylvania industrial corridor contribute to Coatesville's elevated readings.
Geology & Source: Coatesville in Chester County draws from the Coatesville Area Water on Brandywine Creek (Chester County, southeast Pennsylvania) — the Brandywine Creek at Chester County drains the Piedmont (Cambrian Cockeysville Marble — calcareous) and Precambrian Wissahickon Formation (insoluble) — Pennsylvania Chester County Brandywine Creek Cambrian-Precambrian Piedmont calcareous supply produces moderately hard water at 140 mg/L with TDS 278.8 mg/L.