Coolidge Water Hardness & Quality Report (2026)
Water Hardness
20.2 grains per gallon
Source
mixed
pH Level
8.5
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
962 mg/L
Est. Daily Cost
$0.92
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 Coolidge, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Coolidge | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3 yrs | 12 yrs | -75% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Coolidge compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Coolidge, Arizona | 346.5 mg/L | 4.7 ppt | 🔴 Very Hard | mixed |
| Florence, Arizona | 232.5 mg/L | 3.4 ppt | 🔴 Very Hard | mixed |
| San Tan Valley, Arizona | 238.5 mg/L | 3.4 ppt | 🔴 Very Hard | mixed |
| Eloy, Arizona | 141 mg/L | 2.3 ppt | 🟠 Hard | mixed |
| Casa Grande, Arizona | 415.5 mg/L | 5.5 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Coolidge compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Coolidge | 346.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Coolidge's Water Unique?
Local geology and source profile
Coolidge, Arizona, in Pinal County — a Pinal County city adjacent to Casa Grande and Florence in central Arizona — receives its water from the City of Coolidge Water, drawing from the Central Arizona Project or San Carlos Irrigation (Pinal County) through the central Arizona distribution.
The extremely hard 346.5 mg/L hardness and TDS of 962 mg/L reflect the central Arizona Pinal County CAP supply's extremely hard calcareous character — similar to Saddlebrooke AZ (371.5/1066) in the same Pinal County, the Permian Kaibab Limestone and Cretaceous Bisbee Formation produce extremely hard water compounded by the Sonoran Desert semi-arid evaporative concentration. The CAP at Pinal County — Permian Kaibab Limestone (highly calcareous — primary hardness contributor), Cretaceous Bisbee Formation (calcareous — secondary contributor), and desert evaporative concentration (calcareous — primary TDS contributor).
At 346.5 mg/L with TDS 962, Coolidge's water is extremely hard. A water softener is essential to prevent severe scale damage. A reverse osmosis system is required for drinking water. The PFAS level of 4.7 ppt warrants a certified drinking water filter — the Pinal County central Arizona agricultural and industrial corridor contribute to Coolidge's readings.
Geology & Source: Coolidge in Pinal County is served by City of Coolidge Water drawing from the Central Arizona Project — the Pinal County basin drains Permian Kaibab Limestone (highly calcareous) and Cretaceous Bisbee Formation (calcareous) — AZ Pinal County CAP Permian calcareous supply with desert evaporative concentration produces extremely hard water at 346.5 mg/L with TDS 962 mg/L.