East Rancho Dominguez Water Hardness & Quality Report (2026)
Water Hardness
8 grains per gallon
Source
mixed
pH Level
7.9
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
376.9 mg/L
Est. Daily Cost
$0.36
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 East Rancho Dominguez, your appliances are currently losing 18% efficiency due to mineral buildup.
| Appliance | In East Rancho Dominguez | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.1 yrs | 8.5 yrs | -40% |
| Washing Machine | 8.5 yrs | 12 yrs | -29% |
| Water Heater | 10.1 yrs | 15 yrs | -33% |
Regional Water Comparison
How East Rancho Dominguez compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ East Rancho Dominguez, California | 136.5 mg/L | 5.8 ppt | 🟠 Hard | mixed |
| Compton, California | 98.5 mg/L | 4.7 ppt | 🟡 Moderately Hard | mixed |
| Lynwood, California | 56.5 mg/L | 3.5 ppt | 🟢 Soft | mixed |
| Paramount, California | 147 mg/L | 6.2 ppt | 🟠 Hard | mixed |
| South Gate, California | 47 mg/L | 3.2 ppt | 🟢 Soft | mixed |
National Benchmark
How East Rancho Dominguez compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ East Rancho Dominguez | 136.5 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes East Rancho Dominguez's Water Unique?
Local geology and source profile
East Rancho Dominguez, California, in Los Angeles County — an unincorporated Los Angeles County community adjacent to Compton and Carson in the south Los Angeles metro — receives its water from the Central Basin Municipal Water District (CBMWD), drawing from Metropolitan Water District (MWD) Colorado River and State Water Project imports and local Central Basin groundwater through the south Los Angeles distribution.
The moderately hard 136.5 mg/L hardness and TDS of 376.9 mg/L (elevated TDS relative to hardness — reflecting the Colorado River's high dissolved sulfate and chloride) reflect the south Los Angeles Central Basin supply's Colorado River-dominant blend character — harder than the LADWP Owens Valley-dominant communities (Sunland: 33.5 mg/L; Atwater Village: 36.5 mg/L) but moderate. The Colorado River (MWD import) carries dissolved minerals from Permian and Triassic evaporitic Colorado Plateau formations, producing the elevated TDS at the south Los Angeles service zone.
At 136.5 mg/L, East Rancho Dominguez' water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 5.8 ppt warrants a certified drinking water filter — the Los Angeles County south metro industrial corridor (Carson-Compton petrochemical and industrial zone), the Central Basin Superfund groundwater PFAS legacy, and the Colorado River PFAS background contribute to East Rancho Dominguez' readings.
Geology & Source: East Rancho Dominguez in Los Angeles County draws from the Central Basin Municipal Water District on Colorado River MWD imports and local Central Basin groundwater (Los Angeles County, south Los Angeles metro) — MWD delivers Colorado River water blended with State Water Project imports — California Los Angeles County Central Basin MWD Colorado River supply produces moderately hard water at 136.5 mg/L with TDS 376.9 mg/L.