Claremont Water Hardness & Quality Report (2026)
Water Hardness
10.3 grains per gallon
Source
mixed
pH Level
8.2
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
538.3 mg/L
Est. Daily Cost
$0.47
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 Claremont, your appliances are currently losing 24% efficiency due to mineral buildup.
| Appliance | In Claremont | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.8 yrs | 8.5 yrs | -55% |
| Washing Machine | 7.1 yrs | 12 yrs | -41% |
| Water Heater | 8.5 yrs | 15 yrs | -43% |
Regional Water Comparison
How Claremont compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Claremont, California | 176.5 mg/L | 7 ppt | 🟠 Hard | mixed |
| Montclair, California | 38.5 mg/L | 3 ppt | 🟢 Soft | mixed |
| La Verne, California | 52.5 mg/L | 3.4 ppt | 🟢 Soft | mixed |
| Pomona, California | 178 mg/L | 7.1 ppt | 🟠 Hard | mixed |
| Upland, California | 185 mg/L | 7.2 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Claremont compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Claremont | 176.5 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Claremont's Water Unique?
Local geology and source profile
Claremont, California, in Los Angeles County — a major east San Gabriel Valley community, home of the Claremont Colleges (a consortium of five undergraduate colleges and two graduate institutions — Pomona College, Claremont McKenna College, Harvey Mudd College, Scripps College, and Pitzer College — one of the most prestigious college consortiums in the United States), the 'City of Trees and PhDs' (Claremont has one of the highest concentrations of doctoral degrees per capita of any city in the US — reflecting the Claremont Colleges academic community), adjacent to the San Gabriel Mountains' Baldy View and Mount San Antonio (Mount Baldy), and a diverse Los Angeles County academic community — draws its municipal water supply from the Chino Basin wells and MWD import via the Golden State Water Company. Water hardness in Claremont measures 176.5 mg/L — classified as hard.
Claremont's hard supply reflects the east San Gabriel Valley–Chino Basin alluvial aquifer and MWD blend characteristics. The Chino Basin groundwater at Claremont draws from: the Quaternary San Gabriel River alluvial fan (calcareous-moderate); and the Chino Basin agricultural recharge (more calcareous from Inland Valley agricultural water use). The MWD blend (SWP and Colorado River — moderate hardness) is mixed with the harder Chino Basin groundwater, producing the hard 176.5 mg/L.
At 176.5 mg/L, Claremont residents face regular hard water challenges. Monthly descaling with citric acid solution is recommended. Golden State Water Company consistently delivers water meeting all California State Water Board and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Raymond Basin and Chino Basin Groundwater and Metropolitan Water District (MWD) import via the Golden State Water Company (GSWC) Claremont District — the Los Angeles County east San Gabriel Valley Claremont Colleges corridor (Quaternary calcareous San Gabriel River alluvial fan from the San Gabriel Mountains; MWD SWP/Colorado River blend); hard supply at 176.5 mg/L in Los Angeles County.