San Ramon Water Hardness & Quality Report (2026)
Water Hardness
3 grains per gallon
Source
mixed
pH Level
7.3
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
113.4 mg/L
Est. Daily Cost
$0.14
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 Ramon, your appliances are currently losing 7% efficiency due to mineral buildup.
| Appliance | In San Ramon | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.9 yrs | 8.5 yrs | -7% |
| Washing Machine | 11.7 yrs | 12 yrs | -3% |
| Water Heater | 13.5 yrs | 15 yrs | -10% |
Regional Water Comparison
How San Ramon compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ San Ramon, California | 52 mg/L | 3.5 ppt | 🟢 Soft | mixed |
| Danville, California | 86.5 mg/L | 4.5 ppt | 🟡 Moderately Hard | mixed |
| Dublin, California | 89.5 mg/L | 4.6 ppt | 🟡 Moderately Hard | mixed |
| Alamo, California | 43.5 mg/L | 3.3 ppt | 🟢 Soft | mixed |
| Castro Valley, California | 159 mg/L | 6.7 ppt | 🟠 Hard | mixed |
National Benchmark
How San Ramon compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ San Ramon | 52 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes San Ramon's Water Unique?
Local geology and source profile
San Ramon, California, in the San Ramon Valley of Contra Costa County (Tri-Valley) — a major East Bay suburb home of Chevron's North American headquarters and Bishop Ranch office park — draws its municipal water supply through the Dublin San Ramon Services District (DSRSD), which sources from the East Bay Municipal Utility District (EBMUD) Mokelumne River aqueduct system. EBMUD treats and distributes Mokelumne River water from the Sierra Nevada to the East Bay, including the Tri-Valley communities via DSRSD wholesale connections. Water hardness in San Ramon measures 52 mg/L — classified as moderately soft.
San Ramon's soft supply reflects EBMUD's very soft Mokelumne River source water — the same Sierra Nevada granodiorite watershed (Amador–Calaveras Counties, Cretaceous granodiorite and metamorphic roof pendants) that produces Alameda's 39.5 mg/L supply. San Ramon's slightly higher reading (52 vs. 39.5 mg/L) compared to Alameda likely reflects the DSRSD distribution zone's longer pipe network through the San Ramon Valley and possible minor local groundwater blending from Contra Costa County alluvial fan groundwater sources. The Mokelumne River's inherently very soft Sierra Nevada character dominates the San Ramon supply, maintaining the soft finished hardness characteristic of EBMUD-served communities.
With hardness at 52 mg/L, San Ramon residents enjoy soft water with minimal scale challenges. Soap and shampoo lather well. Faucet aerators and showerheads develop deposits slowly. DSRSD and EBMUD consistently deliver water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed supply from East Bay Municipal Utility District (EBMUD) Mokelumne River aqueduct and Contra Costa Water District (CCWD) via the Dublin San Ramon Services District (DSRSD) — the Sierra Nevada granodiorite Mokelumne watershed and Sacramento–San Joaquin Delta source; very soft supply at 52 mg/L in Contra Costa County's Tri-Valley.