Water quality data collected by the U.S. Geological Survey reflects groundwater conditions in Pima County aquifers, sampling wells between 37 and 687 feet deep. This area data shows calcium and magnesium hardness detected in all 15 samples taken from 13 wells between 2016 and 2024, with concentrations ranging widely from 12.9 to 1170.0 mg/L, and a median of 143.0 mg/L. None of these measurements exceeded federal thresholds, indicating no federally defined health-based violations across the sampled sites in this region.
If you observe water hardness entering your commercial building from the Pima County aquifer
Calcium and magnesium naturally dissolve into groundwater as it passes through sediment and rock. The range seen across these wells arises from geological variability and well depth differences. While this regional data illustrates the presence of hardness minerals, the exact hardness level in your building’s water cannot be determined without a specific test of your supply. Understanding the hardness will help diagnose causes of fading in commercial laundry, as mineral deposits can affect detergent performance and fabric wear.
If you consider how aesthetic secondary standards for hardness differ from health-based limits
Government standards classify hardness mainly as an aesthetic or operational concern rather than a health risk. Secondary standards guide taste, scaling, and staining, but do not establish safety violations when exceeded. Pima County's groundwater samples show no values above federal health thresholds, so detected hardness levels alone do not imply unsafe water, but they can still contribute to faded laundry by interfering with cleaning effectiveness.
If you evaluate the impact of plumbing materials and building age in your commercial system
Older plumbing materials and pipes may interact with mineral-rich water differently than newer systems. Scale buildup from hardness minerals can accumulate over time, especially in large commercial buildings serving multiple outlets. This can reduce water flow and contribute to performance issues in laundry operations, accelerating fabric fading or requiring more intensive detergent use, unrelated to the water source quality alone.
If your facility experiences symptoms related and unrelated to water hardness
- Related symptoms: Noticeably faded fabrics after washing, increased detergent usage without improved cleaning results, mineral deposits in washing machines or on fabrics.
- Unrelated symptoms: Discoloration from dyes, chemical damage, or fabric wear due to mechanical action; these do not correlate with hardness levels and require different solutions.
If you need to assess treatment capacity for your commercial building's laundry water demand
When considering treatment solutions, such as commercial water softeners, the design capacity must align with total water usage. For large facilities treating an entire building, a high grain capacity unit, like the Nelsen 450,000 Grain Mineral-Tank Commercial Water Softener, fits the scale of demand. Understanding daily water volume and hardness levels via specific testing helps to select an appropriate capacity, ensuring effective management of hardness and reducing laundry fading.
If your building is large, or serves multiple tenants, affecting water quality management
Water treatment needs scale with building size and usage complexity. Multiple floors, tenants, or commercial units increase total water consumption and introduce variable demands. Treatment equipment with sufficient capacity and flow rate becomes critical to maintaining consistent water quality throughout the building. Planning based on specific consumption and hardness data from targeted testing ensures treatment effectiveness.
It is important not to assume your building's water hardness or treatment needs based on regional groundwater results alone. While the Pima County aquifer data reveals typical ranges in hardness, only a professional water test of your building's supply can confirm actual conditions. Decisions about treatment capacity and configuration require that specific information to address faded laundry and protect fabric quality effectively.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2024-02-01. These figures describe groundwater sampled in this area. They are not a test of any individual private well - only a test of that well can establish its own water.
On record: U.S. Geological Survey sampling of Hardness, Ca, Mg in the aquifer (Pima County): 15 results from 13 wells, median 143.0 mg/L, range 12.9-1170.0 mg/L; none above any federal threshold