Rio Rico Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
mixed
pH Level
7.9
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
1027.9 mg/L
Est. Daily Cost
$0.40
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 Rio Rico, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Rio Rico | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.8 yrs | 8.5 yrs | -20% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How Rio Rico compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Rio Rico, Arizona | ≈ 120–179 mg/L | 4.9 ppt | 🟠 Hard | mixed |
| Nogales, Arizona | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | groundwater |
| Green Valley, Arizona | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | groundwater |
| Sahuarita, Arizona | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | groundwater |
| Vail, Arizona | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | groundwater |
National Benchmark
How Rio Rico compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Rio Rico | ≈ 120–179 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Rio Rico's Water Unique?
Local geology and source profile
Liberty Utilities (Rio Rico Water & Sewer Corp.) serves approximately 17,650 residents across Rio Rico and Mayer in Pima County, Arizona. The utility operates six deep groundwater wells that pump water from regional aquifers beneath the Santa Cruz Valley. No surface water sources are used; the system relies entirely on groundwater extraction from deep formations. The utility publishes an annual Consumer Confidence Report detailing compliance with Safe Drinking Water Act standards, available from Liberty Utilities for current pH, lead/copper compliance data, and treatment process details.
The Santa Cruz Valley's hydrogeology is dominated by Quaternary and Tertiary alluvial and basin-fill deposits, which overlie older Paleozoic and Precambrian bedrock. As groundwater percolates through these layers, it dissolves significant quantities of calcium and magnesium carbonates from limestone and other carbonate-bearing formations, resulting in a hard water supply. This geological setting is typical of southern Arizona's interior basins and produces naturally mineralized groundwater.
Rio Rico's hard water supply causes scale buildup in water heaters, kettles, and pipes, reducing appliance efficiency and lifespan. Soap and detergent effectiveness is diminished, requiring higher doses for cleaning. A water softener is recommended for households seeking to reduce scale formation and improve appliance longevity. Recent water quality testing has identified radiological contaminants, bromide, and 1,2,4-trichlorobenzene in the supply. Residents should consult the latest CCR from Liberty Utilities for current compliance data.
Geology & Source: Santa Cruz Valley Quaternary/Tertiary alluvial basin-fill deposits overlying Paleozoic/Precambrian bedrock; limestone and carbonate formations dissolve calcium and magnesium — hard groundwater supply
Other Arizona Water Reports
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Frequently Asked Questions
Is Rio Rico's water safe to drink?
Do I need a water softener in Rio Rico?
How does Rio Rico compare to the USA average?
Data Sources & Methodology
Water quality data for Rio Rico 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.