Tempe Junction Water Hardness & Quality Report (2026)
Water Hardness
24.6 grains per gallon
Source
mixed
pH Level
8.5
neutral = 7.0
Lead
0.009 mg/L
✓ Below action level
TDS
1288.8 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 Tempe Junction, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Tempe Junction | 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 Tempe Junction compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Tempe Junction, Arizona | 421.5 mg/L | 5.6 ppt | 🔴 Very Hard | mixed |
| Tempe, Arizona | 420 mg/L | 5.6 ppt | 🔴 Very Hard | mixed |
| Ahwatukee Foothills, Arizona | 172.5 mg/L | 2.6 ppt | 🟠 Hard | mixed |
| Scottsdale, Arizona | 293.5 mg/L | 4.1 ppt | 🔴 Very Hard | mixed |
| Paradise Valley, Arizona | 263 mg/L | 3.7 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Tempe Junction compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Tempe Junction | 421.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Tempe Junction's Water Unique?
Local geology and source profile
Tempe Junction, a community within the City of Tempe in Maricopa County, Arizona, receives its water supply through the City of Tempe Water Resources Division, drawing from the same regional Phoenix Basin blend as surrounding greater Phoenix: Salt River Project (SRP) canal water from Roosevelt, Apache, Canyon, and Saguaro Reservoirs on the Salt and Verde River systems; Central Arizona Project (CAP) Colorado River water transported via aqueduct from Lake Havasu; and local groundwater from the Phoenix Active Management Area alluvial basin aquifer. Water hardness at Tempe Junction reaches 421.5 mg/L — extremely hard, ranking among the highest residential readings in Arizona at this particular distribution node.
Tempe Junction's extreme hardness reflects the same geological and climatic drivers operating across the entire Phoenix metropolitan area, at this particular distribution zone where a higher groundwater fraction or upstream pipeline mineralisation may push readings above the median Phoenix Basin value. Colorado River aqueduct water carries heavy mineral loads from Permian Kaibab Limestone, Triassic Moenkopi Formation, and Jurassic carbonate canyon geology. SRP Salt River impoundments contribute calcium-rich desert runoff. The Phoenix Basin alluvial aquifer — ancient Quaternary and Tertiary basin-fill sediments — is highly mineralised due to the Sonoran Desert's extreme aridity and high evapotranspiration rates.
At 421.5 mg/L, Tempe Junction households face extreme and relentless scale build-up. Showerheads block with calcium deposits within days to weeks without descaling, and tile, glass, and chrome fixtures require frequent acidic cleaning to prevent permanent surface damage. Water heaters experience rapid element failure without regular professional descaling; a whole-house water softener is essentially standard equipment for any long-term resident seeking to protect plumbing and appliances from premature deterioration. Tempe Water consistently delivers EPA-compliant, safe water throughout the city despite the extreme hardness.
Geology & Source: Mixed supply from Salt River Project canal water (Roosevelt and Verde River reservoirs) and Central Arizona Project (CAP) Colorado River aqueduct imports, blended with Phoenix Active Management Area groundwater — Sonoran Desert basin-fill evaporitic sediments and Permian–Triassic carbonate canyon geology produce extremely hard supply at 421.5 mg/L in this Phoenix Basin distribution zone.