1. Interpreting Uranium Levels Measured in Coconino County Against Federal Standards
Measurements by the U.S. Geological Survey from July 2017 to April 2026 show uranium concentrations in aquifer 310COCN wells ranging from 0.32 to 9.9 micrograms per liter (µg/L), with a median value of 3.85 µg/L. These samples were taken from wells 600 to 1150 feet deep within Coconino County. Importantly, none of these results exceed federal health-based thresholds for uranium. This indicates that while uranium is present, the recorded levels in the area’s groundwater do not surpass regulatory standards. However, this data reflects area-wide conditions, not any specific household’s water supply, which requires individual testing to confirm its quality.
2. Routine Care Needed for the Pentair Uranium & Radium System
The Pentair Uranium & Radium System is designed to manage uranium and radium effectively in household water. Its maintenance involves periodic replacement of the filtration media after treating about 32,000 grains of contaminant capacity. The frequency of media renewal depends on the water usage of the residence and the concentration levels of uranium and radium present. This predictable maintenance cycle allows homeowners to plan ahead for system upkeep without interruptions in water quality.
3. Changes to Water Quality After Treatment with the Pentair System
Once in operation, the system reduces uranium and radium levels in household water, often resulting in clearer water free from any radioactivity concerns associated with these elements. Treated water should have diminished mineral content related to uranium and radium, contributing to improved taste and less chance of staining or buildup in plumbing fixtures. This treatment provides peace of mind that the water meets safety expectations while maintaining household water convenience.
4. Clarifying the Terms 'Detected,' 'Median,' and 'Range' in Uranium Sampling Records
The term 'detected' means that uranium was measurable by instruments; it does not indicate a violation or unsafe level. The 'median' is the middle value of all samples collected and provides an estimate of typical concentrations in the area’s aquifer. The 'range' shows the lowest to highest values found during the sampling period. These statistics describe the general water quality in the area but do not predict the exact concentration in any single well or household supply.
5. Assessing Treatment Capacity Relative to Household Water Demand
Comparing the system’s 32,000 grain capacity to your household’s daily water consumption is essential to estimate when media replacement will be necessary. Higher water use or higher uranium and radium levels will shorten the media lifespan. Monitoring water volume and testing for uranium periodically helps ensure the system continues to meet your household’s treatment needs effectively.
This summary draws on uranium sampling conducted by the U.S. Geological Survey in wells from 600 to 1150 feet deep within Coconino County’s 310COCN aquifer. For detailed data and updates, visit the official USGS groundwater monitoring site.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2026-04-30. 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 Uranium in the 310COCN aquifer (Coconino County): 20 results from 3 wells, median 3.85 ug/L, range 0.32-9.9 ug/L; none above any federal threshold