Fort Mill Water Hardness & Quality Report (2026)
Water Hardness
8.1 grains per gallon
Source
reservoir
pH Level
8
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
344.7 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 Fort Mill, your appliances are currently losing 18% efficiency due to mineral buildup.
| Appliance | In Fort Mill | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5 yrs | 8.5 yrs | -41% |
| Washing Machine | 8.5 yrs | 12 yrs | -29% |
| Water Heater | 10.1 yrs | 15 yrs | -33% |
Regional Water Comparison
How Fort Mill compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Fort Mill, South Carolina | 138 mg/L | 7.6 ppt | 🟠 Hard | reservoir |
| Rock Hill, South Carolina | 88 mg/L | 4.9 ppt | 🟡 Moderately Hard | reservoir |
| Waxhaw, North Carolina | 104.5 mg/L | 5.6 ppt | 🟡 Moderately Hard | reservoir |
| Charlotte, North Carolina | 152.5 mg/L | 8.1 ppt | 🟠 Hard | reservoir |
| Matthews, North Carolina | 154 mg/L | 8.1 ppt | 🟠 Hard | reservoir |
National Benchmark
How Fort Mill compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Fort Mill | 138 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Fort Mill's Water Unique?
Local geology and source profile
Fort Mill, South Carolina, in York County — a York County city adjacent to Rock Hill and Charlotte NC on Lake Wylie in north South Carolina — receives its water from Fort Mill SC Water or York County Water, drawing from the Catawba River via Lake Wylie (York County) through the Charlotte metro south distribution.
The moderately hard 138 mg/L hardness and TDS of 344.7 mg/L (TDS elevated relative to hardness — reflecting the Catawba River basin's dissolved solids from the Piedmont industrial corridor and calcareous input) reflect the north South Carolina York County Catawba River supply's moderate calcareous character — harder than the upper Catawba sources in the Blue Ridge foothills but typical of the Charlotte metro Lake Wylie zone. The Catawba River at York County — Precambrian Charlotte Belt gneiss (insoluble — dilutant), Cambrian calcareous Piedmont metasediments (calcareous — primary hardness contributor), and Quaternary Piedmont alluvium (slightly calcareous — TDS contributor).
At 138 mg/L, Fort Mill'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 7.6 ppt warrants a certified drinking water filter — the York County north South Carolina Charlotte metro industrial corridor contribute to Fort Mill's elevated readings.
Geology & Source: Fort Mill in York County draws from the Fort Mill SC Water or York County Water on the Catawba River via Lake Wylie (York County, north South Carolina) — the Catawba at York County drains the Piedmont (Precambrian Charlotte Belt gneiss — insoluble) and Cambrian calcareous Piedmont formations — South Carolina York County Catawba River Piedmont Precambrian-Cambrian calcareous watershed produces moderately hard water at 138 mg/L with TDS 344.7 mg/L.