Santa Monica Water Hardness & Quality Report (2026)
Water Hardness
5.6 grains per gallon
Source
mixed
pH Level
7.6
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
236.9 mg/L
Est. Daily Cost
$0.26
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 Santa Monica, your appliances are currently losing 13% efficiency due to mineral buildup.
| Appliance | In Santa Monica | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.4 yrs | 8.5 yrs | -25% |
| Washing Machine | 10 yrs | 12 yrs | -17% |
| Water Heater | 11.8 yrs | 15 yrs | -21% |
Regional Water Comparison
How Santa Monica compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Santa Monica, California | 96 mg/L | 4.7 ppt | 🟡 Moderately Hard | mixed |
| Brentwood, California | 55 mg/L | 3.5 ppt | 🟢 Soft | mixed |
| Venice, California | 78.5 mg/L | 4.2 ppt | 🟡 Moderately Hard | mixed |
| Sawtelle, California | 127 mg/L | 5.6 ppt | 🟠 Hard | mixed |
| Pacific Palisades, California | 100 mg/L | 4.8 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Santa Monica compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Santa Monica | 96 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Santa Monica's Water Unique?
Local geology and source profile
Santa Monica, California, the iconic coastal city on Santa Monica Bay in Los Angeles County, draws its municipal water supply through the City of Santa Monica Water Resources Division, sourcing from both the Los Angeles Department of Water and Power (LADWP) regional water system (delivering blended Owens Valley Aqueduct water, SWP imports, and San Fernando Valley groundwater) and from local Santa Monica Groundwater Basin wells tapping the Charnock subbasin and Olympic subbasin of the Santa Monica Basin alluvial aquifer. Water hardness measures 96 mg/L — classified as moderately soft.
Santa Monica's moderately soft supply reflects the blend of soft LADWP aqueduct-dominated water and local Santa Monica Basin groundwater. The local wells draw from the Santa Monica Basin — a coastal alluvial basin recharged by the Santa Monica Mountains (Precambrian Santa Monica Slate, Malibu Coast Fault Zone crystalline terrain) and Ballona Creek drainage. Both the San Fernando Valley groundwater fraction (dominated by soft Owens Valley aqueduct recharge) and the local Santa Monica Mountains recharge are calcium-poor, keeping the blended supply in the moderately soft range. The Charnock wellfield, historically contaminated and later treated, contributes a treated fraction that is also low in calcium.
With hardness at 96 mg/L, Santa Monica residents experience light to moderate scale accumulation. Faucet aerators and showerheads develop deposits over several months — bi-monthly cleaning with citric acid solution is sufficient. Dishwashers produce clean glassware. City of Santa Monica Water Resources Division consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed supply from Los Angeles Department of Water and Power (LADWP) import blend and Santa Monica Groundwater Basin local wells — LADWP blend of Owens Valley aqueduct Sierra Nevada and State Water Project water; local Santa Monica Basin alluvial aquifer recharged by Santa Monica Mountains Precambrian–Mesozoic granodiorite runoff; the coastal west LA zone produces moderately soft supply at 96 mg/L.