Grover Beach 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
238.9 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 Grover Beach, your appliances are currently losing 13% efficiency due to mineral buildup.
| Appliance | In Grover Beach | 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 Grover Beach compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Grover Beach, California | 96 mg/L | 4.8 ppt | 🟡 Moderately Hard | mixed |
| Arroyo Grande, California | 173.5 mg/L | 7 ppt | 🟠 Hard | mixed |
| Nipomo, California | 53 mg/L | 3.5 ppt | 🟢 Soft | mixed |
| San Luis Obispo, California | 36.5 mg/L | 3 ppt | 🟢 Soft | mixed |
| Santa Maria, California | 91.5 mg/L | 4.6 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Grover Beach compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Grover Beach | 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 Grover Beach's Water Unique?
Local geology and source profile
Grover Beach, California, in San Luis Obispo County — a San Luis Obispo County city adjacent to Pismo Beach and Oceano on the central California coast — receives its water from the South San Luis Obispo County water utilities, drawing from the State Water Project and Lopez Lake (San Luis Obispo County) through the central California coast distribution.
The moderately hard 96 mg/L hardness and TDS of 238.9 mg/L reflect the central California coast San Luis Obispo County supply's moderate character — softer than the south California SWP-Colorado River blend (Carpinteria: 130 mg/L; Oak Park: 138.5 mg/L) due to the central California coast position drawing more of the softer State Water Project Northern California component blended with the Lopez Lake local supply. The San Luis Obispo County supply — State Water Project Northern California (soft — dilutant), Lopez Lake watershed (slightly calcareous — secondary contributor), and Colorado River via MWD blended portion (calcareous — primary hardness contributor).
At 96 mg/L, Grover Beach's water is moderately hard — light scale forms slowly in appliances, dishwashers benefit from rinse aid, and faucet aerators need occasional cleaning. Semi-annual descaling is appropriate. The PFAS level of 4.8 ppt warrants a certified drinking water filter — the San Luis Obispo County central California coast industrial corridor and Camp San Luis Obispo (San Luis Obispo County — AFFF) contribute to Grover Beach's readings.
Geology & Source: Grover Beach in San Luis Obispo County draws from the South San Luis Obispo County Sanitation District utilities on the State Water Project and Lopez Lake (San Luis Obispo County, central California coast) — the SWP supply blends Colorado River (calcareous) and local Arroyo Grande Creek watershed (slightly calcareous) — California San Luis Obispo County SWP-Lopez Lake blended supply produces moderately hard water at 96 mg/L with TDS 238.9 mg/L.