Casas Adobes Water Hardness & Quality Report (2026)
Water Hardness
24.4 grains per gallon
Source
mixed
pH Level
8.5
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
1274.4 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 Casas Adobes, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Casas Adobes | 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 Casas Adobes compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Casas Adobes, Arizona | 418.5 mg/L | 5.6 ppt | 🔴 Very Hard | mixed |
| Flowing Wells, Arizona | 236.5 mg/L | 3.4 ppt | 🔴 Very Hard | mixed |
| Oro Valley, Arizona | 199.5 mg/L | 3 ppt | 🔴 Very Hard | mixed |
| Catalina Foothills, Arizona | 434 mg/L | 5.8 ppt | 🔴 Very Hard | mixed |
| Tucson, Arizona | 255.5 mg/L | 3.6 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Casas Adobes compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Casas Adobes | 418.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Casas Adobes's Water Unique?
Local geology and source profile
Casas Adobes, Arizona, an unincorporated community in Pima County northwest of Tucson — one of the Tucson metropolitan area's largest and most affluent suburban communities in the Catalina Foothills–Thornydale corridor — draws its municipal water supply from the Tucson Basin Aquifer and Central Arizona Project (CAP) Colorado River water via Tucson Water and the Metropolitan Domestic Water Improvement District (MDWID) serving northwest Pima County. Water hardness in Casas Adobes reaches an extraordinary 418.5 mg/L — classified as extremely hard, one of the highest municipal hardness levels in the United States.
Casas Adobes' extreme hardness reflects the Tucson Basin's exceptional desert aquifer chemistry. The Tucson Basin Aquifer consists of Quaternary and Pliocene alluvial fan deposits from the surrounding mountain ranges — the Santa Catalina Mountains (Precambrian Oracle Granite and Pinaleno–Rincon metamorphic complex), the Tucson Mountains (Cretaceous Tucson Mountain Chaos volcanic breccia), and the Tortolita Mountains. The desert alluvial fan sediments are cemented by caliche (calcium carbonate hardpan — extremely reactive calcareous deposit forming the hardpan layers throughout the Sonoran Desert). Additionally, the CAP Colorado River import (very hard at ~600–800 mg/L raw) is blended with the local groundwater — even after treatment the Colorado River contribution maintains very high dissolved calcium levels. The combination of caliche-cemented alluvial groundwater and Colorado River water produces the extraordinary 418.5 mg/L Tucson Basin hardness.
At 418.5 mg/L, Casas Adobes residents face some of the most severe hard water challenges in the US. Scale forms within hours on all surfaces. Daily descaling of faucets and shower fixtures is routine. Water heaters fail rapidly without semi-annual professional maintenance. Tucson Water consistently delivers water meeting all Arizona ADEQ and EPA Safe Drinking Water Act requirements, but home water softeners are strongly advisable.
Geology & Source: Groundwater from the Tucson Basin Aquifer and Central Arizona Project (CAP) Colorado River import via Tucson Water — the Tucson Basin Quaternary caliche-cemented alluvial fill (Santa Cruz River basin, Pima County); extremely hard supply at 418.5 mg/L — one of the hardest municipal supplies in the US — reflecting the Sonoran Desert caliche aquifer and Colorado River blending.