Danville Water Hardness & Quality Report (2026)
Water Hardness
5.1 grains per gallon
Source
mixed
pH Level
7.6
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
210.5 mg/L
Est. Daily Cost
$0.23
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 Danville, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In Danville | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.7 yrs | 8.5 yrs | -21% |
| Washing Machine | 10.4 yrs | 12 yrs | -13% |
| Water Heater | 12.1 yrs | 15 yrs | -19% |
Regional Water Comparison
How Danville compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Danville, California | 86.5 mg/L | 4.5 ppt | 🟡 Moderately Hard | mixed |
| Alamo, California | 43.5 mg/L | 3.3 ppt | 🟢 Soft | mixed |
| San Ramon, California | 52 mg/L | 3.5 ppt | 🟢 Soft | mixed |
| Walnut Creek, California | 147 mg/L | 6.3 ppt | 🟠 Hard | mixed |
| Moraga, California | 60.5 mg/L | 3.8 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Danville compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Danville | 86.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Danville's Water Unique?
Local geology and source profile
Danville, California, in Contra Costa County in the San Ramon Valley — one of the most affluent communities in the San Francisco Bay Area, a premier East Bay suburban community known for the Iron Horse Regional Trail, the Village Theatre, and a major East Bay residential community with proximity to Mount Diablo State Park and the Livermore Valley wine country, consistently rated one of the best places to live in California — draws its municipal water supply from the EBMUD Mokelumne Aqueduct and local Briones Reservoir supply via East Bay Municipal Utility District (EBMUD). Water hardness in Danville measures 86.5 mg/L — classified as moderately soft.
Danville's moderate softness reflects the EBMUD supply's blend of Mokelumne Aqueduct and local reservoir sources. The EBMUD Mokelumne Aqueduct delivers Mokelumne River water (from the Pardee Reservoir in the Sierra Nevada Batholith foothills — soft, approximately 40–70 mg/L). Local Briones and San Pablo Reservoir watersheds drain the Contra Costa County Coastal Range (Franciscan Complex and Great Valley Group — calcareous-poor sedimentary and ophiolitic terrain). The EBMUD blend of soft Mokelumne supply and calcareous-poor local reservoir water produces the moderate 86.5 mg/L at Danville.
With hardness at 86.5 mg/L, Danville residents enjoy moderately soft water. East Bay Municipal Utility District consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Reservoir supply from the San Pablo Reservoir and Briones Reservoir (Contra Costa Canal watershed) via the East Bay Municipal Utility District (EBMUD) and the Town of Danville Water Division — the Contra Costa County San Ramon Valley (Diablo Range calcareous-poor Franciscan Complex and Great Valley Group + EBMUD Mokelumne Aqueduct Sierra Nevada import); moderately soft supply at 86.5 mg/L in Contra Costa County.