Los Altos Water Hardness & Quality Report (2026)
Water Hardness
8.8 grains per gallon
Source
mixed
pH Level
8
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
436.2 mg/L
Est. Daily Cost
$0.40
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 Los Altos, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Los Altos | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.6 yrs | 8.5 yrs | -46% |
| Washing Machine | 8 yrs | 12 yrs | -33% |
| Water Heater | 9.6 yrs | 15 yrs | -36% |
Regional Water Comparison
How Los Altos compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Los Altos, California | 150.5 mg/L | 6.4 ppt | 🟠 Hard | mixed |
| Mountain View, California | 112.5 mg/L | 5.3 ppt | 🟡 Moderately Hard | mixed |
| Palo Alto, California | 119 mg/L | 5.5 ppt | 🟡 Moderately Hard | mixed |
| Stanford, California | 103.5 mg/L | 5 ppt | 🟡 Moderately Hard | mixed |
| Sunnyvale, California | 35.5 mg/L | 3 ppt | 🟢 Soft | mixed |
National Benchmark
How Los Altos compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Los Altos | 150.5 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Los Altos's Water Unique?
Local geology and source profile
Los Altos, California, in Santa Clara County — a major Silicon Valley affluent community (Los Altos is one of the most prestigious and expensive communities in Silicon Valley — a Santa Clara County city adjacent to Mountain View and Palo Alto; Los Altos is known for its beautiful residential neighborhoods, excellent public schools (Los Altos School District and Mountain View-Los Altos High School District are among the most academically distinguished in California), and proximity to Stanford University and the major technology companies of the San Francisco Bay Area), a diverse Santa Clara County community with a highly affluent Chinese-American, Indian-American, and technology executive and venture capital professional population, home of a charming downtown village (the Los Altos downtown on Main Street is a walkable mixed-use village center with high-end restaurants and specialty retail), and one of California's most desirable communities — draws its municipal water supply via the Los Altos Water Company (San Jose Water). Water hardness in Los Altos measures 150.5 mg/L — classified as hard.
Los Altos's hard supply reflects the central Silicon Valley SCVWD supply blend characteristics. The SCVWD distributes State Water Project and local reservoir supply to the central Silicon Valley Los Altos zone, producing the hard 150.5 mg/L.
At 150.5 mg/L, Los Altos residents face regular hard water challenges. Monthly descaling is recommended. San Jose Water Company consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed import supply from the Santa Clara Valley Water District (SCVWD — State Water Project and local) via the Los Altos Water Company or San Jose Water Company — the Santa Clara County Silicon Valley Los Altos corridor (Quaternary calcareous-moderate Santa Clara Valley alluvium — the calcareous-moderate central Silicon Valley SCVWD treated import supply; effective treatment); hard supply at 150.5 mg/L in Santa Clara County.