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

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

Defiance 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

0.008 mg/L

✓ Below action level

TDS

361 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 Defiance, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Defiance	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 Defiance compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Defiance, Ohio	≈ 120–179 mg/L	48.5 ppt	🟠 Hard	river
Van Wert, Ohio	≈ 120–179 mg/L	0 ppt	🟠 Hard	river
Lima, Ohio	≈ 120–179 mg/L	24.4 ppt	🟠 Hard	river
Adrian, Michigan	≈ 120–179 mg/L	0 ppt	🟠 Hard	river
New Haven, Indiana	≈ 180+ mg/L	18.7 ppt	🔴 Very Hard	river

National Benchmark

How Defiance compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Defiance	≈ 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 Defiance's Water Unique?

Local geology and source profile

Source: RiverTDS: 361 mg/LpH: 7.9

The Defiance City Water Treatment Division serves the City of Defiance in Defiance County, Ohio, with a population of approximately 16,000 residents. Water is sourced from surface water, primarily the Maumee River. Treatment occurs at the city's conventional water treatment plant located at 631 Perry Street, utilizing aeration, conventional filtration, softening, and hypochlorite disinfection. The service area covers the city and select surrounding areas in northwest Ohio. The Maumee River watershed drains 6,650 square miles across Indiana, Ohio, and Michigan, feeding into Lake Erie.

The geology of the area features Devonian limestone and dolomite formations like the Silica Shale and Bass Islands Dolomite, which contribute dissolved minerals to the river. This carbonate-rich Paleozoic bedrock imparts a hard character to the water through natural dissolution processes, typical of the region's glacial-fluvial systems. The Maumee River watershed is characterized by Devonian-age limestone and dolomite formations, which are rich in calcium and magnesium carbonates.

Frequent scale buildup in appliances like water heaters and dishwashers can be a major issue, reducing efficiency and lifespan. To mitigate these effects, regular vinegar descaling, installing sediment pre-filters, and flushing water heaters annually are recommended. A whole-house water softener is also suggested to extend plumbing life. The water is slightly alkaline, with a pH in the safe EPA range of 6.5–8.5, and the utility reports 3–7 contaminants above EPA health-based MCLGs in served areas.

Geology & Source: Devonian-age limestone and dolomite formations; Columbus and Detroit River Groups - rich in calcium and magnesium carbonates; Paleozoic carbonate rocks

Other Ohio Water Reports

Van Wert

≈ 120–179 mg/L

🟠 Hard

Lima

≈ 120–179 mg/L

🟠 Hard

Adrian

≈ 120–179 mg/L

🟠 Hard

New Haven

≈ 180+ mg/L

🔴 Very 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 Defiance's water safe to drink?

Yes. Defiance'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 Defiance?

At ≈ 120–179 mg/L (Hard), Defiance'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 Defiance compare to the USA average?

The USA national average is 151 mg/L. Defiance (≈ 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 Defiance 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.