Fontana Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
reservoir
pH Level
7.8
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
326.9 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 Fontana, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Fontana | 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 Fontana compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Fontana, California | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | reservoir |
| Bloomington, California | ≈ 120–179 mg/L | 6 ppt | 🟠 Hard | groundwater |
| Rialto, California | 160 mg/L | 0 ppt | 🟠 Hard | reservoir |
| Glen Avon, California | ≈ 120–179 mg/L | 5.5 ppt | 🟠 Hard | mixed |
| Rubidoux, California | ≈ 120–179 mg/L | 6.8 ppt | 🟠 Hard | mixed |
National Benchmark
How Fontana compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Fontana | ≈ 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 Fontana's Water Unique?
Local geology and source profile
Fontana Water Company serves approximately 214,000 residents in Fontana, San Bernardino County, California. The utility sources drinking water primarily from the surface flow of Lytle Creek and local groundwater wells in the Lytle Basin, Rialto Basin, Chino Basin, and No Man's Land groundwater basin in the Inland Empire. No specific treatment plant names are detailed in available reports, but water undergoes standard processing including disinfection and blending to meet EPA standards before distribution throughout the service area.
The watershed encompasses Lytle Creek in the San Gabriel Mountains region, with groundwater extracted from multiple overlying basins in the Inland Empire. These sources interact with local geology featuring limestone and ancient marine sedimentary deposits that contribute dissolved calcium and magnesium. The mineral-rich rock formations naturally influence water chemistry, giving it a characteristically hard profile from prolonged contact with calcium and magnesium-bearing strata typical of Southern California alluvial basins.
Hard water in Fontana causes scale buildup on fixtures, pipes, and heating elements, most affecting water heaters, dishwashers, washing machines, and coffee makers, reducing efficiency and lifespan. Annual damage from scale may exceed $1,000 per household. Regular vinegar descaling, sediment filters, and monitoring for white deposits are recommended; a water softener is advised to protect appliances. The 2023 Consumer Confidence Report from Fontana Water Company confirms compliance with primary EPA standards; health guidelines are exceeded for 9 contaminants including arsenic from natural deposits — a known carcinogen posing long-term risk even below legal limits.
Geology & Source: Lytle Creek and groundwater from Lytle Basin, Rialto Basin, Chino Basin, and No Man's Land basin; San Gabriel Mountains limestone and ancient marine sedimentary deposits dissolve calcium and magnesium; hard supply
Other California Water Reports
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Frequently Asked Questions
Is Fontana's water safe to drink?
Do I need a water softener in Fontana?
How does Fontana compare to the USA average?
Data Sources & Methodology
Water quality data for Fontana 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.