Understanding Arsenic in Your Local Aquifer Water Supply
The groundwater in this part of Arizona is drawn from an aquifer system that feeds local wells supplying residential taps. The U.S. Geological Survey (USGS) has collected data from this aquifer, sampling 39 results across 30 wells over the period from 2010 to late 2024. These samples show arsenic detections in most cases but remain within federal safety thresholds. This summary provides a checklist to help residents understand the significance of these findings and their own water conditions.
Evaluating Treatment Capacity Against Household Water Demand
Household Water Use Volume
First, determine your daily water usage including drinking, cooking, bathing, and cleaning to ensure any treatment system can handle typical volume efficiently.
Filter Flow Rate
Check that a treatment system, such as the Pentair Arsenic Filter, can process water at a flow rate matching your household’s peak usage without reducing pressure.
Filter Capacity
Consider how much arsenic the system can remove before maintenance or filter replacement is necessary and select a size that suits your projected usage.
Differences Between Public System Records and Private Well Testing
Scope of USGS Sampling
The USGS data reflects arsenic levels from aquifer-wide samples and does not represent any single household’s water supply.
Private Well Variation
Your private well may have arsenic concentrations that differ significantly from regional averages; testing your own water is essential to know your specific conditions.
Regulatory Thresholds versus Aesthetic Considerations
The USGS samples show no results exceeding federal arsenic limits. Detection alone does not imply your water is unsafe but indicates the need for personal testing and potential treatment.
Influence of Sample Depth, Well Depth, and Source Type on Expected Arsenic Levels
Sample Depth Variability
Arsenic concentrations can vary by depth where water is drawn; shallow wells may differ from deeper ones in arsenic presence and levels.
Well Construction and Source Type
The design and location of your well influence arsenic levels due to geological differences and aquifer characteristics.
Impact of Seasonal and Temporal Changes
Arsenic levels can fluctuate over time; ongoing monitoring may be needed to understand trends in your water supply.
Interpreting Certified Laboratory Test Results for Arsenic
Test Report Components
A certified lab report will state arsenic concentration in micrograms per liter (ug/L) along with detection limits and whether results fall below reporting thresholds.
Reading Detection Yet Non-Exceedance
Detection means arsenic was measurable but does not signify regulatory exceedance or unsafe conditions by itself.
Using Results to Guide Treatment Decisions
Compare your test results to federal arsenic standards to evaluate if treatment, such as with the Pentair Arsenic Filter, is advisable for your household.
Fixtures and Uses Most Affected by Arsenic
Drinking and Cooking Water
Arsenic is most critical to address in water consumed or used in food preparation since ingestion routes are a primary concern.
Bathroom Fixtures
Arsenic presence may influence faucet and shower water quality though less critical than direct ingestion.
Appliances and Laundry
While less affected by arsenic, some appliances could experience long-term impacts from mineral content variations in water.
Recommended Action: The Single Water Test to Clarify Your Arsenic Level
To know your household's actual arsenic concentration, order a certified laboratory test specifically for arsenic analysis on your well or supply water. A result below federal thresholds usually means no immediate health-based concern, while any measurable arsenic may merit treatment consideration.
The Pentair Arsenic Filter ships ready to configure and has been documented to address arsenic at typical household demand levels effectively. Confirming your water’s specific arsenic level is the essential first step to determining if this solution meets your needs.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2024-12-18. 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 Arsenic in the aquifer (FIPS ): 39 results from 30 wells, median 5.2 ug/L, range 1.5-46.1 ug/L; none above any federal threshold