Coalinga Water Hardness & Quality Report (2026)
Water Hardness
2.4 grains per gallon
Source
mixed
pH Level
7.2
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
84.3 mg/L
Est. Daily Cost
$0.11
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 Coalinga, your appliances are currently losing 5% efficiency due to mineral buildup.
| Appliance | In Coalinga | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.3 yrs | 8.5 yrs | -2% |
| Washing Machine | 12.1 yrs | 12 yrs | — |
| Water Heater | 14 yrs | 15 yrs | -7% |
Regional Water Comparison
How Coalinga compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Coalinga, California | 40.5 mg/L | 3.1 ppt | 🟢 Soft | mixed |
| Avenal, California | 43 mg/L | 3.2 ppt | 🟢 Soft | mixed |
| Lemoore, California | 163.5 mg/L | 6.7 ppt | 🟠 Hard | mixed |
| Paso Robles, California | 165 mg/L | 6.8 ppt | 🟠 Hard | mixed |
| Kerman, California | 136 mg/L | 5.9 ppt | 🟠 Hard | mixed |
National Benchmark
How Coalinga compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Coalinga | 40.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Coalinga's Water Unique?
Local geology and source profile
Coalinga, California, in Fresno County — a Fresno County city adjacent to Huron and Avenal in the west San Joaquin Valley oil country — receives its municipal water from the Coalinga Water Division, drawing primarily from the State Water Project (SWP) (California Aqueduct delivery) and supplemented by local wells.
The soft 40.5 mg/L hardness and low TDS of 84.3 mg/L reflect a supply dominated by State Water Project water — northern California Sierra Nevada snowmelt from the Sacramento Valley. The SWP delivers water sourced from the Sierra Nevada — insoluble Cretaceous granodiorite (the Sierra Nevada batholith — very low mineral content), transported south through the California Aqueduct. The SWP contribution produces the soft Coalinga supply despite the west San Joaquin Valley's highly mineralized local groundwater (which if used alone would be very hard).
At 40.5 mg/L, Coalinga's water is soft — light scale forms slowly in appliances, dishwashers remain efficient, and bathroom fixtures need occasional cleaning. Semi-annual descaling is appropriate. The PFAS level of 3.1 ppt is low — the Fresno County west San Joaquin Valley oil field setting has limited AFFF military sources near Coalinga, and the SWP source water carries minimal PFAS from the northern California headwaters.
Geology & Source: Coalinga in Fresno County draws from the Coalinga Water Division on the State Water Project and local wells (Fresno County, west San Joaquin Valley) — the SWP delivers Sierra Nevada snowmelt (Cretaceous granodiorite — insoluble) — California Fresno County SWP Sierra Nevada granitic supply produces soft water at 40.5 mg/L with TDS 84.3 mg/L in this Fresno County California city.