Government groundwater sampling from Coconino County’s 310COCN aquifer shows copper was detected in 16 out of 19 samples taken from three wells between July 2017 and April 2026, with measured levels ranging from 0.09 to 2.0 micrograms per liter (ug/L) and a median of 0.415 ug/L. All results were below federal thresholds for safety.
How does the Pentair Blue-Green Copper Stains Filter address copper in household water?
When copper is present in water, it can cause staining on fixtures and surfaces. The Pentair Blue-Green Copper Stains Filter is designed to reduce the copper concentration effectively by filtering out copper ions before they reach household plumbing and appliances. This system uses filtration media that specifically targets and traps dissolved copper, thus preventing it from reacting with water and leaving stains over time.
What does the sampling data tell us about seasonal or long-term variation in copper levels?
The 19 samples collected over nearly nine years from wells 600 to 1150 feet deep show copper detection is consistent but remains within a relatively narrow range. There is no indication of drastic seasonal swings or long-term trends outside this range in the data set. This suggests household copper levels in this aquifer source tend to be stable but can vary slightly within the observed range.
What happens to copper stain problems if left unaddressed for years?
Without treatment, copper in water can gradually accumulate as stains on sinks, tubs, and fixtures, often appearing as blue-green discoloration. While these stains are primarily an aesthetic concern, persistent build-up can be difficult to remove and may affect the appearance and maintenance of household plumbing surfaces.
What does a certified laboratory test report for copper show and how should it be interpreted?
A certified lab test for copper in water will report the concentration in micrograms per liter or parts per billion (ug/L or ppb). It quantifies the dissolved copper present at the time of sampling. To interpret results, compare them to federal guidelines, which show the water is within safe limits if copper remains under the action level. However, even below these levels, staining can occur depending on water chemistry and plumbing materials.
How do well depth and source type affect expected copper levels in household water?
The sampled wells ranged from 600 to 1150 feet deep, representing deeper groundwater sources in the 310COCN aquifer. Deeper wells often have more stable mineral content, but copper levels may still vary locally due to geology or plumbing corrosion. Shallower wells or surface sources could show different copper concentrations, so household testing is important to determine specific water conditions.
To confirm whether copper levels are contributing to staining in your home, order a comprehensive water test from a certified laboratory that measures copper concentration. A result showing copper within typical local ranges and below federal action levels would suggest the Pentair Blue-Green Copper Stains Filter can effectively mitigate staining concerns in Coconino County water.
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 Copper in the 310COCN aquifer (Coconino County): 19 results from 3 wells, median 0.415 ug/L, range 0.09-2.0 ug/L; none above any federal threshold
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