Exeter Water Hardness & Quality Report (2026)
Water Hardness
7.3 grains per gallon
Source
mixed
pH Level
7.9
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
336 mg/L
Est. Daily Cost
$0.33
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 Exeter, your appliances are currently losing 17% efficiency due to mineral buildup.
| Appliance | In Exeter | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.5 yrs | 8.5 yrs | -35% |
| Washing Machine | 9 yrs | 12 yrs | -25% |
| Water Heater | 10.6 yrs | 15 yrs | -29% |
Regional Water Comparison
How Exeter compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Exeter, California | 125 mg/L | 5.6 ppt | 🟠 Hard | mixed |
| Farmersville, California | 157 mg/L | 6.5 ppt | 🟠 Hard | mixed |
| Lindsay, California | 43.5 mg/L | 3.2 ppt | 🟢 Soft | mixed |
| Visalia, California | 123.5 mg/L | 5.5 ppt | 🟠 Hard | mixed |
| Tulare, California | 110.5 mg/L | 5.1 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Exeter compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Exeter | 125 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Exeter's Water Unique?
Local geology and source profile
Exeter, California, in Tulare County — a Tulare County city adjacent to Visalia and Lindsay in the citrus country of the east San Joaquin Valley — receives its water from the Exeter Public Utilities, drawing from the Kaweah River and local wells through the central California San Joaquin Valley distribution.
The moderately hard 125 mg/L hardness and TDS of 336 mg/L reflect the Tulare County supply's moderate calcareous character — the Eocene Tulare Formation and Pleistocene Kaweah River alluvium are calcareous formations in the San Joaquin Valley, and the valley's agricultural water cycling concentrates dissolved mineral content in Exeter's well field zone (compare Visalia CA: 121/324 in Tulare County comparable; Lindsay CA: 128/348 in Tulare County comparable; Exeter consistent moderate from the same Tulare County Kaweah River Eocene calcareous supply). The Kaweah watershed — Eocene Tulare Formation (calcareous — primary hardness contributor), Pleistocene Kaweah River alluvium (calcareous — secondary contributor), and Quaternary San Joaquin Valley evaporation flat (calcareous — TDS contributor).
At 125 mg/L with TDS 336, Exeter's water is moderately hard — mild scale buildup. Semi-annual descaling is appropriate. The PFAS level of 5.6 ppt warrants a certified drinking water filter. Review Exeter Public Utilities' annual water quality report.
Geology & Source: Exeter in Tulare County draws from the Exeter Public Utilities on the Kaweah River supply (Tulare County, San Joaquin Valley California) — the San Joaquin Valley at Tulare County draws from Eocene Tulare Formation (calcareous) and Pleistocene Kaweah River alluvium (calcareous) — California Tulare County Kaweah River Eocene calcareous supply produces moderately hard water at 125 mg/L with TDS 336 mg/L.