Lake Arrowhead Water Hardness & Quality Report (2026)
Water Hardness
4.1 grains per gallon
Source
mixed
pH Level
7.4
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
161.5 mg/L
Est. Daily Cost
$0.19
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 Lake Arrowhead, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Lake Arrowhead | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.3 yrs | 8.5 yrs | -14% |
| Washing Machine | 11 yrs | 12 yrs | -8% |
| Water Heater | 12.8 yrs | 15 yrs | -15% |
Regional Water Comparison
How Lake Arrowhead compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Lake Arrowhead, California | 71 mg/L | 3.9 ppt | 🟡 Moderately Hard | mixed |
| Highland, California | 83.5 mg/L | 4.3 ppt | 🟡 Moderately Hard | mixed |
| San Bernardino, California | 166 mg/L | 6.7 ppt | 🟠 Hard | mixed |
| Redlands, California | 179 mg/L | 7.1 ppt | 🟠 Hard | mixed |
| Hesperia, California | 64.5 mg/L | 3.7 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Lake Arrowhead compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Lake Arrowhead | 71 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Lake Arrowhead's Water Unique?
Local geology and source profile
Lake Arrowhead, California, in San Bernardino County — a San Bernardino County unincorporated community adjacent to Crestline and Running Springs in the San Bernardino Mountains — receives its water from the Lake Arrowhead Community Services District, drawing from Lake Arrowhead reservoir (San Bernardino County) through the San Bernardino Mountains distribution.
The soft 71 mg/L hardness and TDS of 161.5 mg/L reflect the San Bernardino Mountains supply's soft character — despite the hard Inland Empire communities below (Grand Terrace CA: 196.5/627; Bonita CA: 177/540), Lake Arrowhead's high-altitude reservoir position in the Cretaceous Peninsular Ranges Batholith insoluble granite produces much softer water typical of the mountain communities. The Lake Arrowhead reservoir at San Bernardino County — Cretaceous Peninsular Ranges Batholith granite (insoluble — primary dilutant), Precambrian San Gabriel gneiss (insoluble — secondary dilutant), and Quaternary mountain outwash (slightly calcareous — minor hardness contributor).
At 71 mg/L, Lake Arrowhead's water is soft — scale forms slowly in appliances, dishwashers remain efficient, and no softening is needed. Annual descaling is appropriate. The PFAS level of 3.9 ppt warrants a certified drinking water filter — the San Bernardino County mountain-recreational corridor contribute to Lake Arrowhead's readings.
Geology & Source: Lake Arrowhead in San Bernardino County draws from the Lake Arrowhead Community Services District on Lake Arrowhead reservoir (San Bernardino County, San Bernardino Mountains, California) — Lake Arrowhead drains Cretaceous Peninsular Ranges Batholith (insoluble) and Precambrian San Gabriel gneiss (insoluble) — California San Bernardino County San Bernardino Mountains Cretaceous insoluble supply produces soft water at 71 mg/L with TDS 161.5 mg/L.