Autotrol Blue-Green Copper Stains Filter

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What information does a laboratory water test report for copper stains provide?

A typical copper test report lists the concentration of copper in micrograms per liter (ug/L). For the St. Croix County area, the U.S. Geological Survey sampled groundwater from aquifer 368PRDC wells between 2011 and 2018. These reports list a median copper concentration of 13.4 ug/L with a range from 11.5 to 33.1 ug/L among the samples collected. This data reflects the aquifer condition over time but does not specify the copper level in any one household's water supply.

Which fixtures, appliances, or processes in a home are impacted by copper stains first and why?

Copper stains typically appear first on fixtures and surfaces that consistently contact water with dissolved copper. This includes bathroom sinks, tubs, toilets, and kitchen fixtures. Copper can leave characteristic blue-green staining where water splashes or pools. Appliances that use water, such as coffee makers or dishwashers, may show early signs where copper deposits accumulate. The staining results from copper ions reacting with air and other compounds after water exposure.

How should a homeowner interpret the median and range values reported in the area's copper sampling record?

The median value of 13.4 ug/L represents the middle copper concentration measured among the sample wells, meaning half the samples showed copper levels above this number and half below. The reported range, 11.5 to 33.1 ug/L, indicates the lowest and highest copper concentrations measured in individual samples from the aquifer within the timeframe. Homeowners should consider these figures as reflective of typical regional groundwater but not direct readings from their own well.

What do the terms 'detected,' 'median,' and 'range' mean in the copper sampling records for this area?

• Detected means copper was found in all three water samples taken from two different wells in St. Croix County aquifer 368PRDC.
• Median is the middle value separating the higher half from the lower half of measured copper concentrations, here 13.4 ug/L.
• Range shows the span of copper values measured, from 11.5 to 33.1 ug/L across the samples.

These terms describe the data set and do not imply any violation or safety concern by themselves.

How does the measured copper range compare with federal standards, and what conclusions can be drawn?

None of the samples from St. Croix County aquifer 368PRDC exceeded federal thresholds for copper, which are primarily health-based action levels set to protect against excessive copper intake. It's important to understand that copper detection at these levels is not a safety violation and does not necessarily indicate unsafe water. Rather, copper levels detected here relate more to aesthetic concerns such as staining and taste.

What does the seasonal or multi-year variation in copper concentrations in this area tell a homeowner?

The copper samples span from August 2011 to August 2018, showing a relatively consistent range in concentrations over several years. This suggests copper levels in this aquifer are fairly stable, although exact levels for any given well or year may vary. Seasonal or annual fluctuations appear moderate within the sample record, supporting the notion that copper staining issues are generally persistent over time rather than short-lived.

What should a homeowner NOT conclude from copper data reported for this region?

Residents should not assume their household well water matches the measurements found in area sampling. The data reflect conditions at select well depths between 77 and 104 feet and may differ from shallow wells, home plumbing conditions, or treated municipal water. Detection of copper in the region does not mean the water is unsafe or that a legal limit has been exceeded. To understand their specific water quality, homeowners need a professional water test of their own supply.

For households concerned about copper stains on fixtures, the Autotrol Blue-Green Copper Stains Filter ships ready to configure to reduce copper-related staining. This specialized treatment targets dissolved copper effectively, helping protect surfaces and maintain water clarity where staining is problematic.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2018-08-13. 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 368PRDC aquifer (St. Croix County): 3 results from 2 wells, median 13.4 ug/L, range 11.5-33.1 ug/L; none above any federal threshold