Seven Hills Water Hardness & Quality Report (2026)
Water Hardness
10.7 grains per gallon
Source
river
pH Level
8.1
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
392.1 mg/L
Est. Daily Cost
$0.49
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 Seven Hills, your appliances are currently losing 25% efficiency due to mineral buildup.
| Appliance | In Seven Hills | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.5 yrs | 8.5 yrs | -59% |
| Washing Machine | 6.8 yrs | 12 yrs | -43% |
| Water Heater | 8.2 yrs | 15 yrs | -45% |
Regional Water Comparison
How Seven Hills compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Seven Hills, Ohio | 184 mg/L | 7.2 ppt | 🔴 Very Hard | river |
| Parma, Ohio | 164 mg/L | 6.4 ppt | 🟠 Hard | river |
| Garfield Heights, Ohio | 142 mg/L | 5.5 ppt | 🟠 Hard | river |
| Brooklyn, Ohio | 178.5 mg/L | 7 ppt | 🟠 Hard | river |
| Clark-Fulton, Ohio | 251 mg/L | 9.9 ppt | 🔴 Very Hard | river |
National Benchmark
How Seven Hills compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Seven Hills | 184 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Seven Hills's Water Unique?
Local geology and source profile
Seven Hills, Ohio, in Cuyahoga County — a Cuyahoga County city adjacent to Independence and Parma in the south Cleveland suburbs — receives its water from the Cleveland Division of Water, drawing from Lake Erie through the northeast Ohio metropolitan distribution.
The hard 184 mg/L hardness and TDS of 392.1 mg/L reflect the Cuyahoga County Lake Erie supply's hard dolomitic character — the Silurian Niagaran Dolomite and Devonian Columbus Limestone are both highly calcareous formations throughout the Lake Erie basin in northeast Ohio (compare Independence OH: 181/386 in Cuyahoga County comparable; Parma OH: 187/398 in Cuyahoga County comparable; Seven Hills consistent hard from the same Cuyahoga County Cleveland Water Lake Erie Silurian-Devonian dolomitic supply). The Lake Erie basin at Cuyahoga County — Silurian Niagaran Dolomite (highly dolomitic — primary hardness contributor), Devonian Columbus Limestone (calcareous — secondary contributor), and Quaternary glacial drift (calcareous — TDS contributor).
At 184 mg/L with TDS 392, Seven Hills' water is hard — scale builds in appliances and faucets over months. Quarterly descaling is appropriate. The PFAS level of 7.2 ppt warrants a certified drinking water filter — the Cuyahoga County northeast Ohio industrial corridor contributes to Seven Hills' elevated PFAS readings. Review Cleveland Water's annual water quality report for the latest monitoring data.
Geology & Source: Seven Hills in Cuyahoga County draws from the Cleveland Water on Lake Erie (Cuyahoga County, northeast Ohio) — the Lake Erie basin at Cuyahoga County is underlain by Silurian Niagaran Dolomite (highly dolomitic) and Devonian Columbus Limestone (calcareous) — Ohio Cuyahoga County Lake Erie Silurian-Devonian dolomitic supply produces hard water at 184 mg/L with TDS 392.1 mg/L.