Sahuarita Water Hardness & Quality Report (2026)
Water Hardness
180+ mg/L
Very Hardestimated · not lab-verified
Source
groundwater
pH Level
8
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
387.4 mg/L
Est. Daily Cost
$0.91
energy & soap waste
Source: See methodology section below · 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 Sahuarita, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Sahuarita | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.7 yrs | 8.5 yrs | -45% |
| Washing Machine | 6.6 yrs | 12 yrs | -45% |
| Water Heater | 8.3 yrs | 15 yrs | -45% |
Regional Water Comparison
How Sahuarita compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Sahuarita, Arizona | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | groundwater |
| Green Valley, Arizona | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | groundwater |
| Drexel Heights, Arizona | ≈ 180+ mg/L | 4.6 ppt | 🔴 Very Hard | mixed |
| Vail, Arizona | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | groundwater |
| Tucson, Arizona | ≈ 180+ mg/L | 4 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Sahuarita compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Sahuarita | ≈ 180+ mg/L | 🔴 High |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Sahuarita's Water Unique?
Local geology and source profile
Sahuarita Water Company (SWC) provides water to the Town of Sahuarita in Pima County, Arizona, serving residential, commercial, and industrial customers across approximately 60 square miles. The utility sources its supply exclusively from local groundwater wells tapping into the Santa Cruz River Valley aquifers, with no surface water reservoirs or rivers used. Treatment involves disinfection with chlorine, fluoridation, and basic filtration at wellhead facilities to meet EPA standards. SWC operators conduct routine monitoring exceeding regulatory requirements, with annual Consumer Confidence Reports detailing compliance.
The Santa Cruz River basin in southern Arizona's Sonoran Desert is characterized by Basin and Range topography with fault-block mountains and broad valleys. Groundwater flows through alluvial aquifers underlain by Tertiary volcanic tuffs, conglomerates, and older sedimentary rocks, including the Pantano Formation and Rincon Valley Group limestones and dolomites. These carbonate-rich formations dissolve calcium and magnesium ions during recharge from limited precipitation, elevating total dissolved solids and imparting a hard, mineralised character typical of the region's arid groundwater environment.
Very hard water in Sahuarita promotes significant scale buildup in pipes, water heaters, dishwashers, and coffee makers, reducing efficiency and lifespan. Faucets and fixtures develop chalky deposits, while laundry and skin retain soapy residues. Monthly vinegar soaks for showerheads and aerators, regular flushing of water heaters, and rinse aids in dishwashers are essential maintenance steps; a whole-house water softener is highly recommended. Water quality testing confirms EPA compliance for pH (typically 7.5–8.5), lead, and copper; the SoftPro report notes six contaminants above health guidelines. No PFAS data is highlighted in available sources.
Geology & Source: Santa Cruz River Valley Basin and Range aquifer system; Tertiary-Quaternary alluvial fill over fractured volcanic and sedimentary bedrock including Pantano Formation limestones — carbonate dissolution in arid climate yields hard supply
Other Arizona Water Reports
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Frequently Asked Questions
Is Sahuarita's water safe to drink?
Do I need a water softener in Sahuarita?
How does Sahuarita compare to the USA average?
Data Sources & Methodology
Water quality data for Sahuarita is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.