Copper Stains in Suffolk County: What Local Groundwater Sampling Reveals

Government sampling of groundwater in Suffolk County's aquifer 112GLCLU shows copper was detected in only a small fraction of wells and at levels well below federal thresholds.

How extensive is the copper data behind these Suffolk County figures?

The US Geological Survey sampled water from 29 wells in Suffolk County's aquifer 112GLCLU between 2011 and 2018, collecting 87 separate results. Most wells were between 12 and 96 feet deep. Copper was detected in only 5 of these results, while 82 were below the reporting limit. This relatively small number of detections and wells means the data reflect a snapshot of local groundwater conditions, not a continuous or comprehensive profile.

How can a homeowner understand the median and range values reported here?

The median copper concentration in these samples is 2.1 micrograms per liter (ug/L), with a range from 1.4 up to 13.9 ug/L among detected results. Since copper was only detected in 5 out of 87 samples, most samples showed copper levels below the reporting limit. For a homeowner, this range suggests that copper is generally very low in local groundwater but can appear at low concentrations occasionally. None of these levels approach federal health-based thresholds, so their presence alone does not indicate a health concern.

What additional factors does a commercial or industrial user consider beyond household concerns?

While residential users mainly focus on aesthetic effects like copper stains, commercial or industrial operators might evaluate copper for its potential impact on equipment, product quality, or regulatory compliance. They often require more frequent and larger-scale sampling and may assess maximum concentrations, fluctuations over time, and treatment capacity relative to larger water volumes in their processes.

What information should homeowners record before seeking advice on treatment options?

• Test results from your own water source measuring copper concentration specifically
• Daily household water use in gallons to estimate water demand
• Visible signs of copper staining or discoloration on fixtures and laundry
• Any previous water treatment systems and their performance regarding staining
• Well depth and water source type, if known

How does one evaluate treatment capacity relative to daily household water demand?

Understanding your household's daily water use allows matching treatment capacity to actual needs. Treatment systems designed to reduce copper stains have specific throughput capacities. If your water demand is high, ensure the system’s maximum gallons per day aligns with your use. This avoids insufficient treatment and ineffective stain control.

When copper staining occurs, the documented solution is the Autotrol Blue-Green Copper Stains Filter. This system ships ready to configure and is rated to handle typical household water demands as measured. Selecting treatment based on your actual water use and test results ensures effective management of copper stains in Suffolk County water.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2018-10-10. 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 112GLCLU aquifer (Suffolk County): 87 results from 29 wells, median 2.1 ug/L, range 1.4-13.9 ug/L; none above any federal threshold