Hermosa Beach Water Hardness & Quality Report (2026)
Water Hardness
3.5 grains per gallon
Source
mixed
pH Level
7.4
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
132.3 mg/L
Est. Daily Cost
$0.16
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 Hermosa Beach, your appliances are currently losing 8% efficiency due to mineral buildup.
| Appliance | In Hermosa Beach | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.6 yrs | 8.5 yrs | -11% |
| Washing Machine | 11.4 yrs | 12 yrs | -5% |
| Water Heater | 13.2 yrs | 15 yrs | -12% |
Regional Water Comparison
How Hermosa Beach compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Hermosa Beach, California | 60 mg/L | 3.6 ppt | 🟡 Moderately Hard | mixed |
| Redondo Beach, California | 179.5 mg/L | 7.1 ppt | 🟠 Hard | mixed |
| Manhattan Beach, California | 102 mg/L | 4.8 ppt | 🟡 Moderately Hard | mixed |
| Lawndale, California | 145.5 mg/L | 6.1 ppt | 🟠 Hard | mixed |
| El Segundo, California | 38 mg/L | 3 ppt | 🟢 Soft | mixed |
National Benchmark
How Hermosa Beach compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Hermosa Beach | 60 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Hermosa Beach's Water Unique?
Local geology and source profile
Hermosa Beach, California, in Los Angeles County — a small, affluent beach city in the South Bay of Los Angeles County between Manhattan Beach and Redondo Beach, known for its beach volleyball culture and the Strand beachfront path — receives its municipal water from California Water Service (Cal Water), which draws from the Metropolitan Water District (MWD) import through the South Bay distribution network.
The very soft 60 mg/L hardness and low TDS of 132.3 mg/L reflect the MWD-dominant South Bay supply character. The MWD delivers a blend of State Water Project (Sierra Nevada snowmelt — very soft, 30-70 mg/L) and Colorado River Aqueduct (CRA) water (moderately hard, 200-350 mg/L) — in the South Bay distribution zone, the SWP blend ratio dominates, producing the very soft 60 mg/L outcome typical of the LA South Bay coastal communities. The South Bay communities draw from a service zone with higher SWP allocation than the inland San Gabriel Valley zones.
At 60 mg/L, Hermosa Beach's water is very soft — excellent for household use. Scale forms very slowly, soap lathers richly, and appliances maintain excellent efficiency. Annual descaling is more than sufficient. The PFAS level of 3.6 ppt is relatively low for the LA area — Los Angeles International Airport (LAX) (MWD service area, limited AFFF use on the coastal plain), Hawthorne/Northrop Grumman aerospace corridor, and the South Bay's relatively moderate industrial PFAS background contribute to Hermosa Beach's readings.
Geology & Source: Hermosa Beach in Los Angeles County draws from the California Water Service (Cal Water) on MWD import — Metropolitan Water District delivers blended State Water Project (Sierra Nevada snowmelt) and Colorado River Aqueduct water to the South Bay coastal communities — blended SWP-dominated MWD import produces very soft water at 60 mg/L with low TDS 132 mg/L in this Los Angeles County coastal city.