Casa Grande Water Hardness & Quality Report (2026)
Water Hardness
24.3 grains per gallon
Source
mixed
pH Level
8.5
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
1260.5 mg/L
Est. Daily Cost
$1.00
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 Casa Grande, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Casa Grande | 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 Casa Grande compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Casa Grande, Arizona | 415.5 mg/L | 5.5 ppt | 🔴 Very Hard | mixed |
| Eloy, Arizona | 141 mg/L | 2.3 ppt | 🟠 Hard | mixed |
| Maricopa, Arizona | 370 mg/L | 5 ppt | 🔴 Very Hard | mixed |
| Sun Lakes, Arizona | 315 mg/L | 4.3 ppt | 🔴 Very Hard | mixed |
| San Tan Valley, Arizona | 238.5 mg/L | 3.4 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Casa Grande compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Casa Grande | 415.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Casa Grande's Water Unique?
Local geology and source profile
Casa Grande, Arizona, in Pinal County in the Sonoran Desert between Phoenix and Tucson — the 'Heart of Arizona,' home of the mysterious Casa Grande Ruins (Hohokam people's medieval 'big house,' now a National Monument), a major I-10 corridor logistics and manufacturing hub, and a rapidly growing ex-urban Phoenix community — draws its municipal water supply from the Pinal County alluvial basin groundwater and Central Arizona Project (CAP) Colorado River imports via the City of Casa Grande Water Division. Water hardness in Casa Grande measures 415.5 mg/L — classified as extremely hard, among the hardest municipal water supplies in the United States.
Casa Grande's extremely hard supply reflects the Pinal County Sonoran Desert alluvial basin's concentrated calcareous groundwater. The Casa Grande area sits in the ancient Santa Cruz River–Gila River alluvial basin — a deep calcareous alluvial deposit of: Quaternary Arizona desert caliche-rich alluvial fan sediments (the Sonoran Desert alluvial fill is heavily calcite-cemented — caliche hardpan layers accumulate extraordinary dissolved calcium from centuries of evaporative concentration); the CAP Colorado River water (extremely hard, approximately 300–350 mg/L at the Arizona aqueduct delivery); and deep alluvial basin groundwater of very long residence time. The extreme Sonoran Desert evaporative concentration in the alluvial caliche terrain produces the extraordinary 415.5 mg/L.
At 415.5 mg/L, Casa Grande residents face very severe hard water challenges. Scale deposits form extremely rapidly on all fixtures and appliances — weekly descaling and immediate appliance protection measures are strongly recommended. City of Casa Grande Water Division consistently delivers water meeting all Arizona ADEQ and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Pinal County Central Arizona Project (CAP) groundwater sub-basin and direct CAP Colorado River import via the City of Casa Grande Water Division — the Pinal County Sonoran Desert alluvial basin (Santa Cruz River–Gila River alluvial plain) with Colorado River import; extremely hard supply at 415.5 mg/L — among the hardest municipal supplies in the United States, reflecting the Sonoran Desert calcareous alluvial aquifer concentration.