Marana Water Hardness & Quality Report (2026)
Water Hardness
21.3 grains per gallon
Source
mixed
pH Level
8.5
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
1034.4 mg/L
Est. Daily Cost
$0.97
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 Marana, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Marana | 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 Marana compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Marana, Arizona | 364 mg/L | 4.9 ppt | 🔴 Very Hard | mixed |
| 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 |
National Benchmark
How Marana compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Marana | 364 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Marana's Water Unique?
Local geology and source profile
Marana, Arizona, in Pima County northwest of Tucson — one of the fastest-growing communities in Arizona, a rapidly expanding Tucson northwest suburban community in the Avra Valley and Marana Plateau zone, a major exurban Tucson residential and commercial community adjacent to the Tortolita Mountain foothills, and home of a large master-planned community corridor in northwest Pima County — draws its municipal water supply from the Tucson Basin and Avra Valley groundwater via the Town of Marana Water Division. Water hardness in Marana measures 364 mg/L — classified as extremely hard.
Marana's extremely hard supply reflects the Tucson Basin and Avra Valley's exceptional calcareous basin-fill aquifer geology. The Avra Valley Sub-basin aquifer is hosted in: the Quaternary–Tertiary calcareous basin-fill alluvium (thick calcareous alluvial fan deposits eroded from the Cretaceous Bisbee Group calcareous limestone and Paleozoic Naco Formation and Martin Formation limestones of the Tucson Mountains and Silverbell Mountains); Tertiary calcareous volcanic tuffs and calcareous basin sediment of the Basin and Range Tucson metro zone; and calcareous Colorado River water from the Central Arizona Project (CAP) recharge operations. The exceptionally calcareous basin geology produces the extremely hard 364 mg/L at Marana.
At 364 mg/L, Marana residents face severe hard water challenges. Scale deposits form very rapidly on all fixtures and appliances — weekly descaling and appliance protection measures are strongly recommended. Town of Marana Water Division consistently delivers water meeting all Arizona ADEQ and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Tucson Basin and Avra Valley Sub-basin (Central Arizona Project — CAP recharge zone) via the Town of Marana Water Division — the Pima County northwest Tucson Basin and Avra Valley (Quaternary–Tertiary calcareous basin-fill alluvium from Cretaceous–Paleozoic calcareous limestone and dolomite of the Tucson Mountains and Silverbell Mountains); extremely hard supply at 364 mg/L — reflecting the Tucson Basin calcareous basin-fill extreme dissolution.