Mendota Water Hardness & Quality Report (2026)
Water Hardness
4 grains per gallon
Source
mixed
pH Level
7.4
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
158.1 mg/L
Est. Daily Cost
$0.18
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 Mendota, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Mendota | 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 Mendota compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mendota, California | 69 mg/L | 4 ppt | 🟡 Moderately Hard | mixed |
| Kerman, California | 136 mg/L | 5.9 ppt | 🟠 Hard | mixed |
| Madera, California | 67 mg/L | 3.9 ppt | 🟡 Moderately Hard | mixed |
| Chowchilla, California | 107.5 mg/L | 5.1 ppt | 🟡 Moderately Hard | mixed |
| Merced, California | 73 mg/L | 4.1 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Mendota compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mendota | 69 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Mendota's Water Unique?
Local geology and source profile
Mendota, California, in Fresno County — a Fresno County city adjacent to Firebaugh and Fresno in the western San Joaquin Valley — receives its water from the City of Mendota Water Department or Westlands Water District, drawing from San Joaquin River Delta and CVP canals through the central California distribution.
The soft 69 mg/L hardness and TDS of 158.1 mg/L reflect the Fresno County San Joaquin valley supply's soft character — the Quaternary alluvial fan deposits from the Coast Ranges are slightly calcareous from Franciscan Complex serpentinite, while the Pliocene Tulare Formation contributes modest dissolved minerals from its marine and lacustrine sediments (compare Firebaugh CA: 67/153 in Fresno County comparable; Caruthers CA: 71/163 in Fresno County comparable; Mendota consistent soft from the same Fresno County San Joaquin River alluvial supply). The San Joaquin valley at Fresno County — Quaternary alluvial fan deposits (slightly calcareous — primary hardness contributor), Pliocene Tulare Formation (slightly calcareous — secondary contributor), and Holocene Delta sediment (slightly calcareous — minor TDS).
At 69 mg/L with TDS 158, Mendota's water is soft — minimal scale buildup. Annual descaling is appropriate. The PFAS level of 4.0 ppt is moderate and well-managed for the San Joaquin Valley. Review the City of Mendota's annual water quality report.
Geology & Source: Mendota in Fresno County draws from the City of Mendota Water on San Joaquin River supply (Fresno County, central California) — the San Joaquin valley floor at Fresno County draws from Quaternary alluvial fan deposits (slightly calcareous) and Pliocene Tulare Formation (slightly calcareous) — California Fresno County San Joaquin River alluvial supply produces soft water at 69 mg/L with TDS 158.1 mg/L.