How does Rock Hill's water compare to the national average?

The USA national average is 151 mg/L. Rock Hill (≈ 0–59 mg/L) is 121 mg/L softer than average.

Rock Hill Water Hardness & Quality Report (2026)

Water Hardness

soft

~0–59 mg/L

Soft

estimated · not lab-verified

Source

reservoir

pH Level

7.2

neutral = 7.0

Lead

0.004 mg/L

✓ Below action level

TDS

78 mg/L

Est. Daily Cost

$0.08

energy & soap waste

Source: See methodology section below · Updated 2026

soft~0–59 mg/LSoft · est.

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 Rock Hill, your appliances are currently losing 4% efficiency due to mineral buildup.

Appliance	In Rock Hill	Soft Water City	Efficiency Loss
Kettle	8.2 yrs	8.5 yrs	-4%
Washing Machine	11.5 yrs	12 yrs	-4%
Water Heater	14.4 yrs	15 yrs	-4%

Regional Water Comparison

How Rock Hill compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Rock Hill, South Carolina	≈ 0–59 mg/L	34.3 ppt	🟢 Soft	reservoir
Fort Mill, South Carolina	≈ 0–60 mg/L	30.8 ppt	🟢 Soft	reservoir
Weddington, North Carolina	≈ 120–179 mg/L	5.8 ppt	🟠 Hard	reservoir
Waxhaw, North Carolina	≈ 0–60 mg/L	5.6 ppt	🟢 Soft	groundwater
Belmont, North Carolina	≈ 0–60 mg/L	26.4 ppt	🟢 Soft	reservoir

National Benchmark

How Rock Hill compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Rock Hill	≈ 0–59 mg/L	🟢 None
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Rock Hill's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 78 mg/LpH: 7.2

The City of Rock Hill, South Carolina provides water service to over 75,000 residents and serves as a regional wholesale provider to Fort Mill, Tega Cay, York County, the Catawba Indian Nation, and other small private water suppliers. The primary water source is the Catawba River, with the raw water intake located on Lake Wylie in a highly protected and regulated area. Water is treated at the Rock Hill Water Filtration Plant on Cherry Road, where it undergoes treatment to remove minerals and substances added through human activity before distribution throughout the service area.

The Catawba River watershed drains the Piedmont region, characterized by granite bedrock and feldspar minerals typical of the Piedmont physiographic province. The watershed encompasses 3,285 square miles and is fed by nearly 8,000 miles of tributary streams flowing from the North Carolina mountains. While the Piedmont geology naturally contributes some dissolved minerals, Rock Hill's water supply is classified as soft, reflecting the regional hydrogeology and the treatment processes applied at the Rock Hill Water Filtration Plant.

At soft hardness levels, Rock Hill residents experience minimal scale buildup on fixtures and appliances, and water softening treatment is not necessary. Soap and detergents lather effectively, and appliance lifespan is not compromised by mineral accumulation, resulting in lower maintenance requirements compared to hard-water areas. Rock Hill's water contains 0.8 parts per million of fluoride and costs less than $0.005 per gallon. The City has confirmed that its water system contains only non-lead service line materials in both public and private sections, and treated water quality is maintained to exceed Federal Regulatory standards.

Geology & Source: Catawba River Piedmont terrain — granite bedrock and feldspar minerals; Lake Wylie reservoir on Catawba River; limited carbonate exposure means minimal calcium and magnesium dissolution yielding naturally soft supply

Other South Carolina Water Reports

Fort Mill

≈ 0–60 mg/L

🟢 Soft

Weddington

≈ 120–179 mg/L

🟠 Hard

Waxhaw

≈ 0–60 mg/L

🟢 Soft

Belmont

≈ 0–60 mg/L

🟢 Soft

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All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Rock Hill's water safe to drink?

Yes. Rock Hill's water meets all federal safety standards. The hardness is ≈ 0–59 mg/L (Soft), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Rock Hill?

Rock Hill's water is soft at ≈ 0–59 mg/L. A water softener is generally not necessary, though a carbon filter can improve taste and remove any remaining chlorine.

How does Rock Hill compare to the USA average?

The USA national average is 151 mg/L. Rock Hill (≈ 0–59 mg/L) is 121 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Rock Hill is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

Water Hardness

Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

TDS — Total Dissolved Solids

Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.

Measured

PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances

EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.

Modelled

Lead

Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.

Calculated

Appliance Lifespan

Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.