Chino Hills Water Hardness & Quality Report (2026)
Water Hardness
6 grains per gallon
Source
mixed
pH Level
7.7
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
259 mg/L
Est. Daily Cost
$0.27
energy & soap waste
Source: USGS Water Quality Portal · 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 Chino Hills, your appliances are currently losing 14% efficiency due to mineral buildup.
| Appliance | In Chino Hills | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.2 yrs | 8.5 yrs | -27% |
| Washing Machine | 9.8 yrs | 12 yrs | -18% |
| Water Heater | 11.5 yrs | 15 yrs | -23% |
Regional Water Comparison
How Chino Hills compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Chino Hills, California | 103 mg/L | 4.9 ppt | 🟡 Moderately Hard | mixed |
| Pomona, California | 178 mg/L | 7.1 ppt | 🟠 Hard | mixed |
| Diamond Bar, California | 185 mg/L | 7.3 ppt | 🔴 Very Hard | mixed |
| Chino, California | 102.5 mg/L | 4.8 ppt | 🟡 Moderately Hard | mixed |
| La Verne, California | 52.5 mg/L | 3.4 ppt | 🟢 Soft | mixed |
National Benchmark
How Chino Hills compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Chino Hills | 103 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Chino Hills's Water Unique?
Local geology and source profile
Chino Hills, California — a planned hillside community in western San Bernardino County (near the San Bernardino–Orange–Los Angeles County tripoint, famous for its preserved hills and equestrian community) — draws its municipal water supply through the Monte Vista Water District and the Inland Empire Utilities Agency (IEUA), sourcing from the Chino Basin groundwater (the Chino Basin Watermaster manages the shared basin) and Metropolitan Water District (MWD) imported water (SWP and Colorado River Aqueduct). Water hardness in Chino Hills measures 103 mg/L — classified as moderately hard.
Chino Hills' moderate hardness reflects the Chino Basin's water blend. The Chino Groundwater Basin — one of the most litigated and managed groundwater basins in California — is recharged by spreading operations along the Santa Ana River (from San Bernardino Mountains granodiorite snowmelt — very soft) and by MWD imported water percolation through the Prado Basin spreading grounds. The imported MWD water (SWP and Colorado River Aqueduct blend) has moderate hardness, and the Chino Basin alluvial aquifer's deeper, older groundwater can show elevated dissolved minerals from longer residence time in the Quaternary–Pliocene alluvial sediment overlying the Puente Formation (Miocene marine sediment — calcareous cement). The blend produces the moderate 103 mg/L supply in the Chino Hills area.
At 103 mg/L, Chino Hills residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. Monte Vista Water District and IEUA consistently deliver water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed supply from Inland Empire Utilities Agency (IEUA) and Monte Vista Water District — State Water Project (SWP) imports, Colorado River Aqueduct (MWD) imports, and local Chino Basin groundwater via the Chino Basin Watermaster — the Chino Basin alluvial aquifer recharged by the San Gabriel and San Bernardino Mountains granodiorite runoff and Inland Empire spreading; moderately hard supply at 103 mg/L in San Bernardino County.