Piedmont Water Hardness & Quality Report (2026)
Water Hardness
3.9 grains per gallon
Source
mixed
pH Level
7.4
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
153.6 mg/L
Est. Daily Cost
$0.18
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 Piedmont, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Piedmont | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.4 yrs | 8.5 yrs | -13% |
| Washing Machine | 11.1 yrs | 12 yrs | -8% |
| Water Heater | 12.9 yrs | 15 yrs | -14% |
Regional Water Comparison
How Piedmont compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Piedmont, California | 67 mg/L | 4 ppt | 🟡 Moderately Hard | mixed |
| Oakland, California | 142.5 mg/L | 6.2 ppt | 🟠 Hard | mixed |
| Emeryville, California | 71.5 mg/L | 4.1 ppt | 🟡 Moderately Hard | mixed |
| Alameda, California | 39.5 mg/L | 3.2 ppt | 🟢 Soft | mixed |
| Berkeley, California | 190.5 mg/L | 7.6 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Piedmont compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Piedmont | 67 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Piedmont's Water Unique?
Local geology and source profile
Piedmont, California, in Alameda County — an affluent Alameda County city entirely surrounded by Oakland in the East Bay hills — receives its water from the East Bay Municipal Utility District (EBMUD), drawing from the Mokelumne River aqueduct through the north-central California distribution.
The soft 67 mg/L hardness and TDS of 153.6 mg/L reflect the Alameda County Mokelumne River supply's soft Sierra Nevada character — the Cretaceous granodiorite and Paleozoic Calaveras Formation metamorphic rocks are both highly insoluble formations contributing negligible dissolved minerals to the pristine Mokelumne headwaters, with slight blending accounting for the modest TDS (compare Oakland CA: 65/148 in Alameda County; Berkeley CA: 69/158 in Alameda County; Piedmont consistent soft from the same Alameda County Mokelumne River Sierra Nevada granitic supply). The Mokelumne watershed — Cretaceous Sierra Nevada granodiorite (insoluble — primary dilutant), Paleozoic Calaveras Formation (slightly insoluble — secondary dilutant), and Quaternary Sierra Nevada moraines (slightly calcareous — minimal TDS).
At 67 mg/L with TDS 154, Piedmont's water is soft — minimal scale buildup. Annual descaling is appropriate. The PFAS level of 4.0 ppt is moderate and well-managed for the Bay Area. Review EBMUD's annual water quality report.
Geology & Source: Piedmont in Alameda County draws from the EBMUD on the Mokelumne River aqueduct (Alameda County, north-central California) — the Mokelumne watershed drains Cretaceous Sierra Nevada granodiorite (insoluble) and Paleozoic Calaveras Formation (slightly insoluble) — California Alameda County Mokelumne River Sierra Nevada granitic supply produces soft water at 67 mg/L with TDS 153.6 mg/L.