London Water Hardness & Quality Report (2026)
Water Hardness
13.5 grains per gallon
Source
river
pH Level
8.5
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
571.3 mg/L
Est. Daily Cost
$0.61
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 London, your appliances are currently losing 31% efficiency due to mineral buildup.
| Appliance | In London | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 2 yrs | 8.5 yrs | -76% |
| Washing Machine | 5.1 yrs | 12 yrs | -58% |
| Water Heater | 6.4 yrs | 15 yrs | -57% |
Regional Water Comparison
How London compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ London, Ohio | 230.5 mg/L | 9.1 ppt | 🔴 Very Hard | river |
| Hilliard, Ohio | 111.5 mg/L | 4.3 ppt | 🟡 Moderately Hard | river |
| Washington Court House, Ohio | 250.5 mg/L | 9.9 ppt | 🔴 Very Hard | river |
| Grove City, Ohio | 167 mg/L | 6.5 ppt | 🟠 Hard | river |
| Marysville, Ohio | 230 mg/L | 9.1 ppt | 🔴 Very Hard | river |
National Benchmark
How London compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ London | 230.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes London's Water Unique?
Local geology and source profile
London, Ohio, in Madison County — the Madison County seat adjacent to Washington Court House and Circleville in central Ohio — receives its water from the City of London Water Department, drawing from the Scioto River through the central Ohio distribution.
The very hard 230.5 mg/L hardness and TDS of 571.3 mg/L reflect the Madison County supply's very hard central Ohio limestone character — the Silurian Salina Formation and Devonian Columbus Limestone are calcareous-evaporitic formations in the central Ohio limestone plain; the Scioto River at Madison County acquires very hard dissolved mineral content from its Ohio carbonate drainage (compare Washington Court House OH: 226/561 in Fayette County comparable; Circleville OH: 234/581 in Pickaway County comparable; London consistent very hard from the same Madison County Scioto River Silurian calcareous supply). The Scioto River watershed — Silurian Salina Formation (calcareous evaporitic — primary hardness contributor), Devonian Columbus Limestone (calcareous — secondary contributor), and Quaternary Ohio glacial till (calcareous — TDS contributor).
At 230.5 mg/L with TDS 571, London's water is very hard — a water softener is strongly recommended to protect plumbing and appliances. The PFAS level of 9.1 ppt warrants a certified drinking water filter. Review the City of London's annual water quality report.
Geology & Source: London in Madison County draws from the London Water on the Scioto River supply (Madison County, central Ohio) — the central Ohio limestone plain at Madison County draws from Silurian Salina Formation (calcareous evaporitic) and Devonian Columbus Limestone (calcareous) — Ohio Madison County Scioto River Silurian calcareous supply produces very hard water at 230.5 mg/L with TDS 571.3 mg/L.