San Leandro Water Hardness & Quality Report (2026)
Water Hardness
1.8 grains per gallon
Source
mixed
pH Level
7.2
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
61.8 mg/L
Est. Daily Cost
$0.08
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 San Leandro, your appliances are currently losing 4% efficiency due to mineral buildup.
| Appliance | In San Leandro | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.6 yrs | 8.5 yrs | — |
| Washing Machine | 12.5 yrs | 12 yrs | — |
| Water Heater | 14.4 yrs | 15 yrs | -4% |
Regional Water Comparison
How San Leandro compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ San Leandro, California | 30.5 mg/L | 2.9 ppt | 🟢 Soft | mixed |
| Ashland, California | 185 mg/L | 7.4 ppt | 🔴 Very Hard | mixed |
| San Lorenzo, California | 32 mg/L | 2.9 ppt | 🟢 Soft | mixed |
| Cherryland, California | 75 mg/L | 4.2 ppt | 🟡 Moderately Hard | mixed |
| Castro Valley, California | 159 mg/L | 6.7 ppt | 🟠 Hard | mixed |
National Benchmark
How San Leandro compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ San Leandro | 30.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your San Leandro home
Shop water softeners on Amazon.com →
What Makes San Leandro's Water Unique?
Local geology and source profile
San Leandro, California, in south Alameda County on the east shore of San Francisco Bay, draws its municipal water supply from the East Bay Municipal Utility District (EBMUD), sourcing from the Mokelumne River via Pardee Reservoir and the Mokelumne Aqueduct (treated at the Freeport Water Treatment Plant), supplemented by local East Bay watershed reservoirs in the East Bay Hills. San Leandro is served through EBMUD's southern Alameda County distribution network. Water hardness in San Leandro measures 30.5 mg/L — classified as very soft, one of the softest readings in the entire EBMUD service area.
San Leandro's exceptionally soft supply reflects the Mokelumne River Sierra Nevada source water — one of the softest major river systems in California. The Mokelumne River drains the Sierra Nevada batholith (Cretaceous granodiorite, quartz monzonite) and the associated Paleozoic metamorphic belt in Amador and Calaveras Counties — ancient crystalline rocks with essentially zero soluble calcium carbonate after deep burial metamorphism. The EBMUD system's southern Alameda distribution zone appears to receive particularly aqueduct-dominant supply with minimal local groundwater dilution, maintaining very low finished hardness. San Leandro's 30.5 mg/L is among the softest municipal water readings in California.
With hardness at 30.5 mg/L, San Leandro residents enjoy exceptionally soft water with essentially zero scale challenges. Soap and shampoo lather with minimal product. Faucet aerators and showerheads never develop calcium deposits. Dishwashers produce spotless glassware. EBMUD consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed supply from the Mokelumne River (Sierra Nevada) via the East Bay Municipal Utility District (EBMUD) — Mokelumne River Cretaceous granodiorite Sierra Nevada snowmelt is the dominant EBMUD supply; the San Leandro distribution zone in southern Alameda County receives EBMUD water showing very soft supply at 30.5 mg/L, the softest in the East Bay service area.