Tehachapi Water Hardness & Quality Report (2026)
Water Hardness
6.9 grains per gallon
Source
mixed
pH Level
7.8
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
310.1 mg/L
Est. Daily Cost
$0.31
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 Tehachapi, your appliances are currently losing 16% efficiency due to mineral buildup.
| Appliance | In Tehachapi | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.7 yrs | 8.5 yrs | -33% |
| Washing Machine | 9.2 yrs | 12 yrs | -23% |
| Water Heater | 10.9 yrs | 15 yrs | -27% |
Regional Water Comparison
How Tehachapi compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Tehachapi, California | 118 mg/L | 5.3 ppt | 🟡 Moderately Hard | mixed |
| Arvin, California | 182 mg/L | 7.2 ppt | 🔴 Very Hard | mixed |
| Rosamond, California | 140 mg/L | 5.9 ppt | 🟠 Hard | mixed |
| California City, California | 189.5 mg/L | 7.4 ppt | 🔴 Very Hard | mixed |
| Lamont, California | 101 mg/L | 4.8 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Tehachapi compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Tehachapi | 118 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Tehachapi's Water Unique?
Local geology and source profile
Tehachapi, California, in Kern County — a Kern County city adjacent to Lancaster and Bakersfield in the Tehachapi Mountains of south-central California — receives its water from the Tehachapi-Cummings County Water District, drawing from the Tehachapi Valley Groundwater Basin or State Water Project supply (Kern County) through the south-central California distribution.
The moderately hard 118 mg/L hardness and TDS of 310.1 mg/L reflect the south-central California Kern County Tehachapi Basin supply's moderate calcareous character — the Pliocene Tehachapi Formation and Quaternary valley alluvium calcareous contacts contribute moderate hardness, compounded by the semi-arid Tehachapi Mountains evaporative concentration typical of the inland California mountain communities (compare Black Forest CO: 106.5 mg/L; California City CA: 148.5 mg/L on harder Kern Desert groundwater). The Tehachapi Basin at Kern County — Pliocene Tehachapi Formation (calcareous — primary hardness contributor), Quaternary valley alluvium (slightly calcareous — secondary contributor), and Jurassic Southern Sierra Nevada granite (insoluble — dilutant from upper watershed).
At 118 mg/L with TDS 310, Tehachapi's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 5.3 ppt warrants a certified drinking water filter — the Kern County south-central California military and industrial corridor contribute to Tehachapi's readings.
Geology & Source: Tehachapi in Kern County draws from the Tehachapi-Cummings County Water District on the Tehachapi Valley Groundwater Basin (Kern County, south-central California) — the Tehachapi Basin is developed in Pliocene Tehachapi Formation (calcareous) and Quaternary valley alluvium (slightly calcareous) — California Kern County Tehachapi Basin Pliocene-Quaternary calcareous supply produces moderately hard water at 118 mg/L with TDS 310.1 mg/L.