Nogales Water Hardness & Quality Report (2026)
Water Hardness
23.6 grains per gallon
Source
mixed
pH Level
8.5
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
1210.7 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 Nogales, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Nogales | 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 Nogales compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Nogales, Arizona | 404.5 mg/L | 5.4 ppt | 🔴 Very Hard | mixed |
| Rio Rico, Arizona | 362.5 mg/L | 4.9 ppt | 🔴 Very Hard | mixed |
| Green Valley, Arizona | 148 mg/L | 2.3 ppt | 🟠 Hard | mixed |
| Sahuarita, Arizona | 180 mg/L | 2.7 ppt | 🔴 Very Hard | mixed |
| Sierra Vista, Arizona | 401.5 mg/L | 5.4 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Nogales compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Nogales | 404.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Nogales's Water Unique?
Local geology and source profile
Nogales, Arizona, in Santa Cruz County — a US-Mexico border city adjacent to Heroica Nogales, Sonora (Mexico), the primary land port of entry in the Arizona-Sonora border, a binational metropolitan area straddling the international boundary at the Mariposa Port of Entry — receives its municipal water from the Nogales Water Supply System, which draws from the Santa Cruz River alluvial aquifer and local production wells in the Santa Cruz Basin in southern Santa Cruz County.
The extremely hard 404.5 mg/L hardness and very high TDS of 1210.7 mg/L reflect the Santa Cruz Basin's extreme Basin and Range evaporite and carbonate geology in one of the most arid regions of the United States. The Santa Cruz River valley's alluvial aquifer accesses Tertiary basin-fill alluvial sediment (deposited in the closed or semi-closed bolson basins typical of the Sonoran Desert Basin and Range province) that has concentrated dissolved minerals through extreme evaporation over millions of years. The surrounding mountains include Paleozoic limestone and dolomite (Devonian Martin Formation, Permian Epitaph Dolomite), Cretaceous calcareous volcanic tuff, and Tertiary gypsum-bearing lacustrine deposits — all contributing calcium, sulfate, and bicarbonate to the deep alluvial basin groundwater. The Sonoran Desert's extreme aridity amplifies concentration.
At 404.5 mg/L with TDS 1211 mg/L, Nogales's water is in the highest extreme hardness category — comparable to Gardner KS and Murphy TX. A whole-house water softener is essential and kitchen reverse osmosis filtration for drinking water is strongly recommended — TDS of 1211 mg/L is more than twice the EPA aesthetic guideline. The PFAS level of 5.4 ppt warrants RO filtration — the Fort Huachuca (US Army intelligence center in Sierra Vista, Santa Cruz County corridor), Davis-Monthan AFB in the broader Arizona military aviation complex, and the border zone industrial activity contribute to the PFAS background.
Geology & Source: Nogales in Santa Cruz County draws from the Nogales Water Supply System on the Santa Cruz River alluvial aquifer — the Santa Cruz Basin concentrates dissolved minerals from Paleozoic limestone, Permian dolomite, and Tertiary gypsum lacustrine deposits in this Sonoran Desert basin — Basin and Range evaporite and carbonate alluvial aquifer produces extremely hard water at 404.5 mg/L with very high TDS 1211 mg/L in this Santa Cruz County Arizona border city.