Grass Valley Water Hardness & Quality Report (2026)
Water Hardness
2.7 grains per gallon
Source
mixed
pH Level
7.3
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
97.9 mg/L
Est. Daily Cost
$0.12
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 Grass Valley, your appliances are currently losing 6% efficiency due to mineral buildup.
| Appliance | In Grass Valley | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.1 yrs | 8.5 yrs | -5% |
| Washing Machine | 11.9 yrs | 12 yrs | -1% |
| Water Heater | 13.8 yrs | 15 yrs | -8% |
Regional Water Comparison
How Grass Valley compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Grass Valley, California | 46 mg/L | 3.3 ppt | 🟢 Soft | mixed |
| North Auburn, California | 63 mg/L | 3.8 ppt | 🟡 Moderately Hard | mixed |
| Auburn, California | 35 mg/L | 3 ppt | 🟢 Soft | mixed |
| Lincoln, California | 191 mg/L | 7.6 ppt | 🔴 Very Hard | mixed |
| Rocklin, California | 109.5 mg/L | 5.2 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Grass Valley compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Grass Valley | 46 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Grass Valley home
Shop water softeners on Amazon.com →
What Makes Grass Valley's Water Unique?
Local geology and source profile
Grass Valley, California, in Nevada County — a Nevada County city adjacent to Auburn and Penn Valley in the Sierra Nevada foothills of California — receives its water from the Nevada Irrigation District, drawing from Rollins Reservoir or Lake Wildwood (Nevada County) through the Sierra Nevada foothills distribution.
The very soft 46 mg/L hardness and low TDS of 97.9 mg/L reflect the Sierra Nevada foothills Nevada County supply's very soft character — similar to North Auburn CA (63 mg/L/142) on the same general Placer-Nevada County Sierra Nevada foothill supply, the Jurassic granodiorite and Cretaceous auriferous gravels contribute negligible calcareous dissolution. The Bear River-South Yuba watershed at Nevada County — Jurassic Sierra Nevada granodiorite (insoluble — primary dilutant), Cretaceous auriferous gravels (insoluble — secondary dilutant), and Quaternary valley alluvium (slightly calcareous — minor TDS contributor).
At 46 mg/L, Grass Valley's water is very soft — scale forms very slowly in appliances, dishwashers remain efficient, and no softening is needed. Annual descaling is appropriate. The PFAS level of 3.3 ppt is relatively low — warrants routine monitoring but no urgent filtration.
Geology & Source: Grass Valley in Nevada County draws from the Nevada Irrigation District on Rollins Reservoir or Lake Wildwood (Nevada County, Sierra Nevada foothills, California) — the Bear River-South Yuba watershed drains the Sierra Nevada (Jurassic granodiorite — insoluble) and Cretaceous auriferous gravels (insoluble) — California Nevada County Sierra Nevada foothill Jurassic-Cretaceous insoluble supply produces very soft water at 46 mg/L with TDS 97.9 mg/L.