La Mirada Water Hardness & Quality Report (2026)
Water Hardness
2.6 grains per gallon
Source
mixed
pH Level
7.3
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
91.8 mg/L
Est. Daily Cost
$0.12
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 La Mirada, your appliances are currently losing 6% efficiency due to mineral buildup.
| Appliance | In La Mirada | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.1 yrs | 8.5 yrs | -5% |
| Washing Machine | 12 yrs | 12 yrs | — |
| Water Heater | 13.8 yrs | 15 yrs | -8% |
Regional Water Comparison
How La Mirada compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ La Mirada, California | 44 mg/L | 3.1 ppt | 🟢 Soft | mixed |
| South Whittier, California | 62.5 mg/L | 3.7 ppt | 🟡 Moderately Hard | mixed |
| Buena Park, California | 115 mg/L | 5.2 ppt | 🟡 Moderately Hard | mixed |
| Whittier, California | 119.5 mg/L | 5.4 ppt | 🟡 Moderately Hard | mixed |
| La Habra, California | 38.5 mg/L | 3 ppt | 🟢 Soft | mixed |
National Benchmark
How La Mirada compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ La Mirada | 44 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes La Mirada's Water Unique?
Local geology and source profile
La Mirada, California, in southeast Los Angeles County on the Los Angeles–Orange County border — a planned community (one of the first master-planned cities in California, developed by the Crowell-Collier Company in the 1950s), known for Biola University, La Mirada Regional Park, and a comfortable middle-class suburban community adjacent to the Cerritos corridor — draws its municipal water supply from Metropolitan Water District (MWD) imports and Central Basin supplies via the City of La Mirada Water Division. Water hardness in La Mirada measures 44 mg/L — classified as very soft.
La Mirada's very soft supply — among the softest in Los Angeles County — reflects the city's advanced water treatment investment and its planned community's modern infrastructure. Like neighboring Cerritos (46.5 mg/L), La Mirada benefits from: advanced reverse osmosis (RO) membrane treatment dramatically reducing the hard MWD import; purpose-built planned community distribution infrastructure (installed in the 1950s–1970s master-planned development era, with consistent upgrades); and the Central Basin MWD spreading grounds with treated, moderately softened supply. The combination produces the extraordinary 44 mg/L — one of the softest treated supplies in all of Southern California.
With hardness at 44 mg/L, La Mirada residents enjoy some of the softest water in Los Angeles County. City of La Mirada Water Division consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed supply from the Los Angeles County Metropolitan Water District (MWD) import and the Central Basin Municipal Water District with reverse osmosis (RO) treatment via the City of La Mirada Water Division — the Los Angeles County southeast Central Basin (MWD Colorado River and Bay-Delta import + treated Central Basin); very soft supply at 44 mg/L — reflecting advanced water treatment and modern distribution infrastructure in the southeast LA County zone.