Westmont Water Hardness & Quality Report (2026)
Water Hardness
4.6 grains per gallon
Source
mixed
pH Level
7.5
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
186.5 mg/L
Est. Daily Cost
$0.21
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 Westmont, your appliances are currently losing 11% efficiency due to mineral buildup.
| Appliance | In Westmont | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7 yrs | 8.5 yrs | -18% |
| Washing Machine | 10.7 yrs | 12 yrs | -11% |
| Water Heater | 12.4 yrs | 15 yrs | -17% |
Regional Water Comparison
How Westmont compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Westmont, California | 79.5 mg/L | 4.2 ppt | 🟡 Moderately Hard | mixed |
| Lennox, California | 166.5 mg/L | 6.7 ppt | 🟠 Hard | mixed |
| Willowbrook, California | 164.5 mg/L | 6.7 ppt | 🟠 Hard | mixed |
| Gardena, California | 72 mg/L | 4 ppt | 🟡 Moderately Hard | mixed |
| Inglewood, California | 84.5 mg/L | 4.3 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Westmont compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Westmont | 79.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Westmont's Water Unique?
Local geology and source profile
Westmont, California, an unincorporated community in Los Angeles County — a major south Los Angeles community (Westmont is a significant Los Angeles County unincorporated community in the south-central Los Angeles corridor — one of the densely populated unincorporated communities adjacent to South Gate, Lynwood, and Inglewood; Westmont is in the central LA County Basin south of the Santa Monica and San Gabriel Mountains), a diverse Los Angeles County community with a majority African-American and growing Hispanic-American population, adjacent to the I-110 (Harbor Freeway) corridor, home of a significant manufacturing and residential community, and part of the unincorporated south Los Angeles communities that have historically received fewer city services than incorporated areas — draws its municipal water supply via the LA County Waterworks District 21. Water hardness in Westmont measures 79.5 mg/L — classified as moderately soft.
Westmont's moderate softness reflects the south Los Angeles Central Basin supply blending. The LA County Basin alluvium at Westmont–LA County draws from groundwater blended with Metropolitan Water District (MWD) Colorado River and State Water Project import supply (treated), producing the moderately soft 79.5 mg/L.
With hardness at 79.5 mg/L, Westmont residents enjoy moderately soft water. LA County Waterworks consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Central Basin Municipal Water District (Los Angeles River alluvium) via the Westmont–West Athens Water Mutual or LA County Waterworks District 21 — the Los Angeles County south Los Angeles central basin corridor (Quaternary calcareous-poor LA Basin alluvial deposits treated with MWD import supply blending — the moderately soft south Los Angeles coastal plain supply; effective softening); moderately soft supply at 79.5 mg/L in Los Angeles County.