Montclair Water Hardness & Quality Report (2026)
Water Hardness
2.2 grains per gallon
Source
mixed
pH Level
7.2
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
78.6 mg/L
Est. Daily Cost
$0.10
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 Montclair, your appliances are currently losing 5% efficiency due to mineral buildup.
| Appliance | In Montclair | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.3 yrs | 8.5 yrs | -2% |
| Washing Machine | 12.2 yrs | 12 yrs | — |
| Water Heater | 14.1 yrs | 15 yrs | -6% |
Regional Water Comparison
How Montclair compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Montclair, California | 38.5 mg/L | 3 ppt | 🟢 Soft | mixed |
| Claremont, California | 176.5 mg/L | 7 ppt | 🟠 Hard | mixed |
| Ontario, California | 41.5 mg/L | 3.1 ppt | 🟢 Soft | mixed |
| Upland, California | 185 mg/L | 7.2 ppt | 🔴 Very Hard | mixed |
| Chino, California | 102.5 mg/L | 4.8 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Montclair compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Montclair | 38.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Montclair's Water Unique?
Local geology and source profile
Montclair, California, in San Bernardino County in the west Inland Empire — a densely urbanized west San Bernardino County community in the Pomona Valley adjacent to Ontario, Pomona, and Upland, home of the Montclair Place shopping center, a diverse community with significant Latino-American and Filipino-American populations, and a west Inland Empire suburban community at the Los Angeles–San Bernardino County border — draws its municipal water supply from the Chino Basin and IEUA via the Golden State Water Company. Water hardness in Montclair measures 38.5 mg/L — classified as very soft.
Montclair's very soft supply — exceptionally soft for an Inland Empire community — reflects the Inland Empire Utilities Agency's effective advanced treatment program. The Chino Basin (Upper Santa Ana Valley groundwater) typically has hardness of 200–350 mg/L from the calcareous alluvium of the San Gabriel Mountains. However, the IEUA applies advanced treatment including reverse osmosis and nanofiltration through its Regional Sewage Facilities and Groundwater Replenishment programs, substantially softening the blended supply. Golden State Water Company distributes this IEUA-treated water in Montclair, producing the exceptional 38.5 mg/L.
With hardness at 38.5 mg/L, Montclair residents enjoy exceptionally soft water for the Inland Empire. Golden State Water Company consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Chino Basin (Upper Santa Ana Valley Groundwater Basin) via the Inland Empire Utilities Agency (IEUA) and Golden State Water Company — the San Bernardino County west Inland Empire Chino Basin (Quaternary calcareous alluvium from San Gabriel Mountains; IEUA advanced treatment and MWD import blending; effective softening in the Montclair zone); very soft supply at 38.5 mg/L — reflecting IEUA's effective advanced treatment in Montclair.