Castaic Water Hardness & Quality Report (2026)
Water Hardness
9.1 grains per gallon
Source
mixed
pH Level
8.1
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
449.9 mg/L
Est. Daily Cost
$0.41
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 Castaic, your appliances are currently losing 21% efficiency due to mineral buildup.
| Appliance | In Castaic | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.5 yrs | 8.5 yrs | -47% |
| Washing Machine | 7.9 yrs | 12 yrs | -34% |
| Water Heater | 9.4 yrs | 15 yrs | -37% |
Regional Water Comparison
How Castaic compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Castaic, California | 155 mg/L | 6.4 ppt | 🟠 Hard | mixed |
| Valencia, California | 43 mg/L | 3.1 ppt | 🟢 Soft | mixed |
| Stevenson Ranch, California | 75 mg/L | 4.1 ppt | 🟡 Moderately Hard | mixed |
| Santa Clarita, California | 85.5 mg/L | 4.4 ppt | 🟡 Moderately Hard | mixed |
| Canyon Country, California | 101 mg/L | 4.8 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Castaic compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Castaic | 155 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Castaic's Water Unique?
Local geology and source profile
Castaic, California, in Los Angeles County — a Los Angeles County unincorporated community adjacent to Santa Clarita and Val Verde, at the upper Santa Clara River valley below Castaic Lake (State Water Project terminal reservoir) — receives its municipal water from the Castaic Lake Water Agency, drawing from Castaic Lake (the southern terminal of the California State Water Project East Branch) and local groundwater.
The moderately hard 155 mg/L hardness and elevated TDS of 449.9 mg/L reflect the California State Water Project aqueduct blend. Castaic Lake receives the State Water Project water via the California Aqueduct — a blend of Sacramento-San Joaquin Delta (Sacramento River and San Joaquin River combined at the Delta), Feather River (Oroville Dam storage), and Owens Valley groundwater. The State Water Project delivery at Castaic is moderately hard and elevated-TDS from the San Joaquin Valley-Central Valley mineral load accumulated along the aqueduct from the Delta to Castaic.
At 155 mg/L, Castaic'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 6.4 ppt warrants a certified drinking water filter — the Edwards Air Force Base (Kern County — California Aqueduct zone, major AFFF user), the Marine Corps Air Station Miramar (San Diego — California Aqueduct basin), and the Central Valley PFAS agricultural corridor contribute to Castaic's readings.
Geology & Source: Castaic in Los Angeles County draws from the Castaic Lake Water Agency on Castaic Lake (State Water Project, Los Angeles County) blended with local Santa Clara River wells — the State Water Project delivers Sacramento-San Joaquin Delta and Feather River water through the California Aqueduct — California Aqueduct Sacramento Delta-Feather River drainage produces moderately hard water at 155 mg/L with elevated TDS 450 mg/L in this Los Angeles County California community.