South Whittier Water Hardness & Quality Report (2026)
Water Hardness
3.7 grains per gallon
Source
mixed
pH Level
7.4
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
138.8 mg/L
Est. Daily Cost
$0.17
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 South Whittier, your appliances are currently losing 8% efficiency due to mineral buildup.
| Appliance | In South Whittier | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.5 yrs | 8.5 yrs | -12% |
| Washing Machine | 11.3 yrs | 12 yrs | -6% |
| Water Heater | 13.1 yrs | 15 yrs | -13% |
Regional Water Comparison
How South Whittier compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ South Whittier, California | 62.5 mg/L | 3.7 ppt | 🟡 Moderately Hard | mixed |
| Whittier, California | 119.5 mg/L | 5.4 ppt | 🟡 Moderately Hard | mixed |
| West Whittier-Los Nietos, California | 171 mg/L | 6.9 ppt | 🟠 Hard | mixed |
| La Mirada, California | 44 mg/L | 3.1 ppt | 🟢 Soft | mixed |
| Santa Fe Springs, California | 91 mg/L | 4.5 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How South Whittier compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ South Whittier | 62.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes South Whittier's Water Unique?
Local geology and source profile
South Whittier, California, an unincorporated community in southeast Los Angeles County adjacent to Whittier and La Mirada — a residential community in the southeast Los Angeles suburban corridor between the Puente Hills and the Los Angeles Coastal Plain — draws its municipal water supply from the Central Basin and San Gabriel Valley Groundwater Basin (the Whittier Narrows area where the basins connect) and Metropolitan Water District (MWD) imported water via the Los Angeles County Waterworks Districts. Water hardness in South Whittier measures 62.5 mg/L — classified as moderately soft.
South Whittier's moderate softness reflects the southeast Los Angeles County supply blend in the Whittier Narrows zone. The Central Basin groundwater at South Whittier benefits from the West Basin Municipal Water District and Central Basin Municipal Water District's spreading programs that inject soft MWD State Water Project Sacramento River imports into the coastal plain basin. Additionally, the Whittier Narrows area serves as the hydraulic connection between the San Gabriel Valley Basin and the Central Basin, allowing flow of moderately soft San Gabriel Valley Basin water southward. The combination of SWP-recharged Central Basin groundwater and MWD imports produces the moderate 62.5 mg/L.
With hardness at 62.5 mg/L, South Whittier residents enjoy moderately soft water with minimal scale challenges. Los Angeles County Waterworks Districts consistently deliver water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Central Basin (Los Angeles Coastal Plain Groundwater Basin) and Metropolitan Water District (MWD) imports via the Los Angeles County Department of Public Works Water District (Consolidated) serving south Whittier — the south Los Angeles County Whittier Narrows Coastal Plain alluvial basin; moderately soft supply at 62.5 mg/L in Los Angeles County.