How does Norwalk's water compare to the national average?

The USA national average is 151 mg/L. Norwalk (≈ 180+ mg/L) is 189 mg/L harder than average.

Norwalk Water Hardness & Quality Report (2026)

Water Hardness

very hard

180+ mg/L

Very Hard

estimated · not lab-verified

Source

river

pH Level

neutral = 7.0

Lead

0.009 mg/L

✓ Below action level

TDS

690.6 mg/L

Est. Daily Cost

$0.91

energy & soap waste

Source: See methodology section below · Updated 2026

very hard180+ mg/LVery Hard · 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 Norwalk, your appliances are currently losing 45% efficiency due to mineral buildup.

Appliance	In Norwalk	Soft Water City	Efficiency Loss
Kettle	4.7 yrs	8.5 yrs	-45%
Washing Machine	6.6 yrs	12 yrs	-45%
Water Heater	8.3 yrs	15 yrs	-45%

Regional Water Comparison

How Norwalk compares to its nearest neighbours

City	Hardness	Risk	Source
▶ Norwalk, Ohio	≈ 180+ mg/L	🔴 Very Hard	river
Sandusky, Ohio	≈ 120–179 mg/L	🟠 Hard	river
Vermilion, Ohio	235.5 mg/L	🔴 Very Hard	river
Vermilion-on-the-Lake, Ohio	≈ 120–179 mg/L	🟠 Hard	river
Amherst, Ohio	≈ 120–179 mg/L	🟠 Hard	river

National Benchmark

How Norwalk compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Norwalk	≈ 180+ mg/L	🔴 High
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Norwalk's Water Unique?

Local geology and source profile

Source: RiverTDS: 690.6 mg/LpH: 8

NORWALK CITY PWS serves Norwalk, Ohio, in Huron County, providing drinking water to the city and surrounding areas. The primary source is surface water from the Huron River and its associated reservoirs, collected via rainwater runoff across the watershed. The Water Treatment Plant at 201 Woodlawn Avenue, originally built in 1927 and subsequently upgraded in 1990–91, 2002, and 2006, has a treatment capacity of up to 4 million gallons per day. The utility can be reached at 419-663-6736 at 38 Whittlesey Ave, Norwalk, OH 44857.

The Huron River watershed drains through Northern Ohio's glacial till and bedrock, shaping the water's mineral profile. Underlying Devonian and Silurian rock formations — including shales, limestones, and dolomites — naturally dissolve calcium and magnesium, imparting a hard character to the supply. No groundwater aquifer is utilized; the surface water reflects the geology of till plains and moraines across Huron County, producing elevated mineral content without significant natural softening.

Very hard water promotes scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan. Spots on glassware and reduced soap lathering are common household effects. Regular descaling of fixtures and appliances is strongly recommended, and a water softener is advised to mitigate these issues and extend equipment life. Water quality is rated excellent with a violation score of 0.0; treatment involves conventional filtration, pre-oxidation with chlorine, and hypochlorite disinfection.

Geology & Source: Huron County, Northern Ohio; Devonian shales and limestones — Ohio Shale Group and Columbus Limestone; carbonate bedrock and dolomite dissolve calcium and magnesium into surface reservoirs, producing hard water

Other Ohio Water Reports

Sandusky

≈ 120–179 mg/L

🟠 Hard

Vermilion

235.5 mg/L

🔴 Very Hard

Vermilion-on-the-Lake

≈ 120–179 mg/L

🟠 Hard

Amherst

≈ 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 Norwalk's water safe to drink?

Yes. Norwalk's water meets all federal safety standards. The hardness is ≈ 180+ mg/L (Very Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Norwalk?

At ≈ 180+ mg/L (Very Hard), Norwalk'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 45%.

How does Norwalk compare to the USA average?

The USA national average is 151 mg/L. Norwalk (≈ 180+ mg/L) is 189 mg/L above the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Norwalk 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.