How does Rocky River's water compare to the national average?

The USA national average is 151 mg/L. Rocky River (≈ 120–179 mg/L) is 1 mg/L softer than average.

Rocky River Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

river

pH Level

7.9

neutral = 7.0

Lead

0.003 mg/L

✓ Below action level

TDS

274.1 mg/L

Est. Daily Cost

$0.40

energy & soap waste

Source: See methodology section below · Updated 2026

hard~120–179 mg/LHard · 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 Rocky River, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Rocky River	Soft Water City	Efficiency Loss
Kettle	6.8 yrs	8.5 yrs	-20%
Washing Machine	9.6 yrs	12 yrs	-20%
Water Heater	12 yrs	15 yrs	-20%

Regional Water Comparison

How Rocky River compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Rocky River, Ohio	≈ 120–179 mg/L	5.7 ppt	🟠 Hard	river
Lakewood, Ohio	≈ 120–179 mg/L	0 ppt	🟠 Hard	river
Fairview Park, Ohio	≈ 120–179 mg/L	7.4 ppt	🟠 Hard	river
Westlake, Ohio	≈ 120–179 mg/L	6.4 ppt	🟠 Hard	river
Bay Village, Ohio	≈ 120–179 mg/L	9.3 ppt	🟠 Hard	river

National Benchmark

How Rocky River compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Rocky River	≈ 120–179 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Rocky River's Water Unique?

Local geology and source profile

Source: RiverTDS: 274.1 mg/LpH: 7.9

Rocky River, Ohio, receives its drinking water from the Cleveland Division of Water, which serves over 80 communities in Cuyahoga County and surrounding areas. The primary source is Lake Erie, drawn through intake cribs in the western basin, with water treated at the Division Avenue Water Treatment Plant and the Bellaire Purification Plant. Cleveland Water is the largest public water system in Ohio, delivering over 100 million gallons daily to a multi-county service area west and east of the Cuyahoga River.

The Lake Erie watershed supplies Cleveland Water, with the Rocky River serving as a key tributary to the broader basin hydrology. Underlying Devonian shale and sandstone formations — including the Chagrin Shale and Berea Sandstone — overlain by glacial deposits, impart a mineralized character to the surface water. This geological influence from Paleozoic bedrock shapes the water chemistry, moderated by lake mixing but retaining regional hardness traits typical of Great Lakes inflows.

At moderately hard levels, water can leave noticeable scale on fixtures, reduce soap lathering efficiency, and shorten the lifespan of water heaters and dishwashers. Faucets, showerheads, and laundry machines benefit from periodic vinegar soaks or descalers. A water softener is often recommended to mitigate spotting on glassware and improve detergent performance. Cleveland Water maintains EPA compliance with neutral to slightly alkaline pH around 7.5–8.5, achieving lead and copper rule compliance through corrosion control, with disinfection via chloramines and advanced filtration.

Geology & Source: Rocky River watershed drains glacial till over Devonian-age Chagrin Shale and Berea Sandstone; carbonate-influenced sedimentary rocks contribute dissolved calcium and magnesium — hard water typical of the northeastern Ohio region

Other Ohio Water Reports

Lakewood

≈ 120–179 mg/L

🟠 Hard

Fairview Park

≈ 120–179 mg/L

🟠 Hard

Westlake

≈ 120–179 mg/L

🟠 Hard

Bay Village

≈ 120–179 mg/L

🟠 Hard

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Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

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

Frequently Asked Questions

Is Rocky River's water safe to drink?

Yes. Rocky River's water meets all federal safety standards. The hardness is ≈ 120–179 mg/L (Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Rocky River?

At ≈ 120–179 mg/L (Hard), Rocky River's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 20%.

How does Rocky River compare to the USA average?

The USA national average is 151 mg/L. Rocky River (≈ 120–179 mg/L) is 1 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 Rocky River 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.