Loma Linda Water Hardness & Quality Report (2026)
Water Hardness
180+ mg/L
Very Hardestimated · not lab-verified
Source
groundwater
pH Level
7.8
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
300.5 mg/L
Est. Daily Cost
$0.91
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 Loma Linda, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Loma Linda | 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 Loma Linda compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Loma Linda, California | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | groundwater |
| Grand Terrace, California | ≈ 120–179 mg/L | 224 ppt | 🟠 Hard | groundwater |
| Colton, California | ≈ 180+ mg/L | 118.3 ppt | 🔴 Very Hard | groundwater |
| San Bernardino, California | ≈ 120–179 mg/L | 45.3 ppt | 🟠 Hard | groundwater |
| Redlands, California | 152 mg/L | 34 ppt | 🟠 Hard | reservoir |
National Benchmark
How Loma Linda compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Loma Linda | ≈ 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 Loma Linda's Water Unique?
Local geology and source profile
The City of Loma Linda Public Works Department operates the water utility in San Bernardino County, California, serving a population of approximately 25,000 residents. Water is sourced entirely from local groundwater wells in the Bunker Hill subbasin of the Chino Basin, with no surface water component. No named treatment plants are specified, but the system employs filtration and ionic exchange processes for treatment. The utility is located at 25541 Barton Road, with 24/7 emergency service available at (909) 799-2800.
Loma Linda's groundwater originates in the Bunker Hill-Chino Basin watershed within the Santa Ana River system. Aquifer recharge comes from mountain front runoff and percolation through alluvial fans from the San Bernardino Mountains. The geology features Quaternary-age alluvial sediments — sands, gravels, and silts — overlying the Pliocene-Pleistocene Fernando Formation. These formations, derived from eroded limestones and dolomites, impart a hard character through natural mineral dissolution, elevating dissolved solids in a pattern common to Southern California basins.
Very hard water promotes significant scale buildup in water heaters, dishwashers, washing machines, and fixtures including faucets and showerheads. White spots on glassware, soap scum, and reduced appliance efficiency are common. Maintenance includes regular vinegar descaling, installing scale-inhibiting filters, and using detergent additives for hard water. A whole-house water softener is recommended to extend appliance life. The water supply meets all EPA Maximum Contaminant Level Goals (MCLGs) with no violations; treatment includes filtration and ionic exchange, and the 2020 Consumer Confidence Report confirmed ongoing compliance.
Geology & Source: Bunker Hill Basin, Chino Groundwater Basin; Quaternary alluvial deposits over Fernando Formation (Pliocene-Pleistocene) — carbonate-rich sands and gravels from San Bernardino Mountains leach calcium and magnesium, producing hard groundwater
Other California Water Reports
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Frequently Asked Questions
Is Loma Linda's water safe to drink?
Do I need a water softener in Loma Linda?
How does Loma Linda compare to the USA average?
Data Sources & Methodology
Water quality data for Loma Linda 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.