Hilliard Water Hardness & Quality Report (2026)
Water Hardness
7 grains per gallon
Source
river
pH Level
8.1
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
177.1 mg/L
Est. Daily Cost
$0.32
energy & soap waste
Source: See methodology section below · 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 Hilliard, your appliances are currently losing 16% efficiency due to mineral buildup.
| Appliance | In Hilliard | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.6 yrs | 8.5 yrs | -34% |
| Washing Machine | 9.2 yrs | 12 yrs | -23% |
| Water Heater | 10.8 yrs | 15 yrs | -28% |
Regional Water Comparison
How Hilliard compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Hilliard, Ohio | 120 mg/L | 4.3 ppt | 🟠 Hard | river |
| Dublin, Ohio | ≈ 120–179 mg/L | 4 ppt | 🟠 Hard | groundwater |
| Upper Arlington, Ohio | ≈ 120–179 mg/L | 8.2 ppt | 🟠 Hard | river |
| Powell, Ohio | ≈ 120–179 mg/L | 9.3 ppt | 🟠 Hard | river |
| Worthington, Ohio | ≈ 120–179 mg/L | 8.6 ppt | 🟠 Hard | river |
National Benchmark
How Hilliard compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Hilliard | 120 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Hilliard's Water Unique?
Local geology and source profile
Hilliard, Ohio is served by Columbus Public Water, a major municipal utility serving over 1.27 million people across Franklin County and surrounding areas. The system draws from both surface water — the Scioto River — and groundwater sources, with treatment occurring at the Hilliard Water Treatment Plant. The utility routinely monitors for contaminants and publishes annual Consumer Confidence Reports detailing water quality results. The 2023 Annual Drinking Water Quality Report provides comprehensive treatment and compliance information for residents.
The Scioto River watershed flows through central Ohio's glaciated terrain, underlain by Devonian-age Columbus Limestone and Ordovician dolomite formations. These carbonate bedrock units are highly soluble, releasing substantial quantities of dissolved calcium and magnesium into both surface and groundwater. This geological setting produces the characteristically hard water supply throughout the region — a feature common to Ohio's limestone belt — with Columbus Public Water softening the supply to approximately 120 ppm for optimal corrosion control.
Hard water causes typical mineral-related issues in Hilliard: scale buildup on fixtures and in water heaters, reduced soap effectiveness, and spotting on dishes and glassware. Residents may experience lower water pressure over time due to mineral deposits in pipes. A water softener or whole-house ion-exchange system is recommended, particularly for laundry and dishwashing applications. According to recent water quality data, Hilliard's tap water contains 4 contaminants above EPA health-based guidelines (MCLGs); Columbus Public Water maintains zero MCL violations.
Geology & Source: Central Ohio Scioto River watershed; Devonian-age Columbus Limestone and Ordovician dolomite — highly soluble carbonate formations release calcium and magnesium, producing characteristically hard water across the Ohio limestone belt
Other Ohio Water Reports
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Frequently Asked Questions
Is Hilliard's water safe to drink?
Do I need a water softener in Hilliard?
How does Hilliard compare to the USA average?
Data Sources & Methodology
Water quality data for Hilliard is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
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.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
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.
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.
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.
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.