Norwalk Water Hardness & Quality Report (2026)
Water Hardness
15 grains per gallon
Source
river
pH Level
8.5
neutral = 7.0
Lead
0.009 mg/L
✓ Below action level
TDS
690.6 mg/L
Est. Daily Cost
$0.69
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 Norwalk, your appliances are currently losing 34% efficiency due to mineral buildup.
| Appliance | In Norwalk | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 4.1 yrs | 12 yrs | -66% |
| Water Heater | 5.3 yrs | 15 yrs | -65% |
Regional Water Comparison
How Norwalk compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Norwalk, Ohio | 257.5 mg/L | 10.2 ppt | 🔴 Very Hard | river |
| Sandusky, Ohio | 124 mg/L | 4.8 ppt | 🟠 Hard | river |
| Ashland, Ohio | 196.5 mg/L | 7.7 ppt | 🔴 Very Hard | river |
| Lorain, Ohio | 179.5 mg/L | 7 ppt | 🟠 Hard | river |
| Mansfield, Ohio | 208 mg/L | 8.2 ppt | 🔴 Very Hard | river |
National Benchmark
How Norwalk compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Norwalk | 257.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Norwalk's Water Unique?
Local geology and source profile
Norwalk, Ohio, in Huron County — the Huron County seat adjacent to Willard and Bellevue in north-central Ohio — receives its municipal water from the Norwalk Water Division, drawing from the Huron River at the Norwalk reservoir (Huron County) through the Norwalk treatment plant.
The very hard 257.5 mg/L hardness and high TDS of 690.6 mg/L reflect the north-central Ohio Till Plain's intense carbonate character. The Huron River at Huron County drains the Ohio Till Plain — Silurian Lockport Dolomite (the dominant north Ohio carbonate platform — very high purity dolomite, similar to Niagara Dolomite), Devonian Columbus Limestone (very high purity carbonate — the dominant Ohio limestone quarry formation), and calcareous Pleistocene Erie Lobe till (ground-up dolomite and limestone from the Wisconsin Glaciation). The cumulative Silurian-Devonian pure carbonate and Pleistocene till produces the very hard north-central Ohio supply.
At 257.5 mg/L, Norwalk's water is very hard. A water softener is strongly recommended. Scale builds rapidly on all heating surfaces, appliance lifespans are significantly shortened, and water heaters require annual descaling without softening. The PFAS level of 10.2 ppt warrants a certified reverse osmosis drinking water filter — the Huron County north-central Ohio industrial corridor, the Great Lakes PFAS legacy from the Erie Basin industrial discharge history, and the north Ohio PFAS background contribute to Norwalk's very elevated readings.
Geology & Source: Norwalk in Huron County draws from the Norwalk Water Division on the Huron River (Huron County, north-central Ohio) — the Huron River at Huron County drains the Ohio Till Plain (Silurian Lockport Dolomite, Devonian Columbus Limestone, calcareous Pleistocene Erie Lobe till) — Ohio Huron County Silurian-Devonian carbonate watershed produces very hard water at 257.5 mg/L with TDS 690.6 mg/L in this Huron County Ohio city.