San Tan Valley Water Hardness & Quality Report (2026)
Water Hardness
13.9 grains per gallon
Source
mixed
pH Level
8.3
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
565.6 mg/L
Est. Daily Cost
$0.64
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 San Tan Valley, your appliances are currently losing 32% efficiency due to mineral buildup.
| Appliance | In San Tan Valley | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.7 yrs | 8.5 yrs | -80% |
| Washing Machine | 4.8 yrs | 12 yrs | -60% |
| Water Heater | 6.1 yrs | 15 yrs | -59% |
Regional Water Comparison
How San Tan Valley compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ San Tan Valley, Arizona | 238.5 mg/L | 3.4 ppt | 🔴 Very Hard | mixed |
| Queen Creek, Arizona | 208.5 mg/L | 3.1 ppt | 🔴 Very Hard | mixed |
| Florence, Arizona | 232.5 mg/L | 3.4 ppt | 🔴 Very Hard | mixed |
| Apache Junction, Arizona | 379 mg/L | 5.1 ppt | 🔴 Very Hard | mixed |
| Gilbert, Arizona | 356.5 mg/L | 4.8 ppt | 🔴 Very Hard | mixed |
National Benchmark
How San Tan Valley compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ San Tan Valley | 238.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes San Tan Valley's Water Unique?
Local geology and source profile
San Tan Valley, Arizona — a fast-growing unincorporated community in Pinal County southeast of Phoenix and east of Chandler — draws its municipal water supply through local utilities including the Queen Creek Water Company and San Tan Flat water providers, sourcing from the Central Arizona Project (CAP) Colorado River deliveries and local Pinal County–East Maricopa alluvial basin groundwater wells in the Queen Creek and San Tan Valley area. San Tan Valley is one of the fastest-growing communities in Arizona. Water hardness in San Tan Valley measures 238.5 mg/L — classified as very hard.
San Tan Valley's very hard supply reflects both components of the east Pinal County supply blend. Colorado River water (CAP aqueduct) brings substantial dissolved minerals from the Colorado Plateau calcareous formations (Kaibab Limestone, Redwall Limestone, Bright Angel Shale) and evaporite-rich Grand Canyon Basin drainage. Local Pinal County alluvial groundwater in the San Tan Valley area — from the Queen Creek alluvial fan and the San Tan Mountains basin fringe — carries dissolved calcium and magnesium from the Precambrian Pinal Schist and calcareous desert alluvium of the Sonoran Desert. The combination of hard CAP imports and very hard local desert basin groundwater produces the very hard 238.5 mg/L reading.
At 238.5 mg/L, San Tan Valley residents face significant hard water challenges. Scale deposits form rapidly on faucet aerators, showerheads, shower glass, and tile — monthly descaling with citric acid solution is essential maintenance. Dishwashers require rinse-aid, and water heaters need annual professional inspection. Local utilities consistently deliver water meeting all Arizona ADEQ and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed supply from the Queen Creek Water Company or San Tan Flat utilities — blending Colorado River (CAP aqueduct) imported water and local East Maricopa–Chandler Alluvial Basin groundwater; hard supply at 238.5 mg/L in the rapidly growing San Tan Valley area of east Pinal County — reflecting the calcareous Arizona desert alluvial basin groundwater character.