Hamilton Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
river
pH Level
7
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
369.5 mg/L
Est. Daily Cost
$0.40
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 Hamilton, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Hamilton | 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 Hamilton compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Hamilton, Ohio | ≈ 120–179 mg/L | 11.2 ppt | 🟠 Hard | river |
| Fairfield, Ohio | ≈ 120–179 mg/L | 16 ppt | 🟠 Hard | groundwater |
| Forest Park, Ohio | ≈ 120–179 mg/L | 9.6 ppt | 🟠 Hard | groundwater |
| Trenton, Ohio | ≈ 120–179 mg/L | 4.3 ppt | 🟠 Hard | groundwater |
| Springdale, Ohio | ≈ 120–179 mg/L | 4 ppt | 🟠 Hard | river |
National Benchmark
How Hamilton compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Hamilton | ≈ 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 Hamilton's Water Unique?
Local geology and source profile
The City of Hamilton Department of Underground Utilities serves approximately 25,000 customers in Hamilton and portions of Butler County, Ohio. Water is sourced 100% from the Great Miami Buried Valley Aquifer via 21 deep wells, with no surface water intake. Raw groundwater is treated at two water treatment plants using a chlorine dioxide disinfection process and distributed through over 289 miles of mains, delivering an average of 18.5 million gallons per day to the service area.
The Great Miami Buried Valley Aquifer formed in Pleistocene glacial sand-and-gravel deposits within a buried valley of the Great Miami River Valley, approximately 210 feet underground. Underlying formations of Silurian-age dolomites and shales influence groundwater recharge chemistry. Groundwater dissolves calcium and magnesium from these surrounding carbonate-rich bedrock units as it percolates through the aquifer sediments, producing a characteristically hard supply typical of Midwestern buried valley aquifer systems with elevated mineral content.
Hard water leaves noticeable scale on fixtures and reduces efficiency in water heaters, dishwashers, washing machines, and boilers, increasing energy costs over time. Dry skin and poor soap lathering are common complaints. Regular descaling, vinegar rinses, and low-flow aerators provide relief; a water softener is recommended to extend equipment life and mitigate buildup. The aquifer carries high contamination susceptibility; treatment employs chlorine dioxide; third-party analyses report exceedances above EPA health guidelines for chromium (hexavalent), PFAS, and TTHMs (7 such exceedances noted); the utility meets official standards per published reports, and lead/copper compliance data are available through annual CCRs.
Geology & Source: Great Miami Buried Valley Aquifer — Pleistocene glacial outwash sands and gravels at ~210 ft depth; underlain by Silurian dolomites and shales; carbonate dissolution elevates calcium and magnesium, yielding hard groundwater
Other Ohio Water Reports
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Frequently Asked Questions
Is Hamilton's water safe to drink?
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How does Hamilton compare to the USA average?
Data Sources & Methodology
Water quality data for Hamilton 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.