Residential Total Well Water Treatment in Hennepin County from Aquifer 112GSSG Data

What do 'detected', 'median', and 'range' mean in the government sampling record for this area?

Water quality records for Hennepin County’s aquifer 112GSSG are based on samples taken from 20 wells between 9 and 29 feet deep, collected over a five-year period. When a constituent like chloride is detected in all samples, it means the measuring instruments found it present in every test, but this does not indicate any health concern or violation. The median value is the middle concentration when arranging all sample results from lowest to highest; for this aquifer, the median chloride concentration was 76.5 mg/L. The range reflects the lowest and highest recorded values, which in this case varied widely from 2.28 mg/L up to 328.0 mg/L. These terms describe the overall regional water quality but do not provide a specific result for any household’s water.

How would a homeowner read the chloride median and range values in this record?

Seeing a median chloride level of 76.5 mg/L indicates that half of the sampled wells had chloride concentrations below this value and half above. The broad range up to 328.0 mg/L shows that some wells in the area may experience higher chloride levels, which can affect water taste, cause metal staining, or contribute to plumbing corrosion. However, it is important to understand that the detection of chloride and even values exceeding a secondary standard for aesthetics (250 mg/L) do not mean the water is unsafe. Homeowners should perform testing on their own water source to know their specific concentrations rather than relying on regional data alone.

Once the documented technology is in place, how does the treated water differ at the tap?

The Autotrol Total Well Chlorination System addresses concerns related to total well water by ensuring effective treatment that reduces the impact of chlorides and total dissolved solids. While it does not alter the original raw water chemistry at the source, this system conditions water to prevent taste issues and staining caused by elevated chlorides. It ships ready to configure for residential use and provides a grain capacity of 32,000 to accommodate typical household demand. Residents with failed equipment can restore water quality performance by applying this system’s technology, improving daily water use experience.

How many samples and wells back these chloride values, and what does a small sample imply?

The data comes from 23 samples taken from 20 distinct wells over several years, providing a snapshot rather than continuous monitoring. While the sample size gives an overview of aquifer 112GSSG in Hennepin County, it is not a comprehensive assessment of every well in the area. Small sample sizes mean there is natural variability that might not be fully captured. Homeowners should consider this in context and recognize that their well water could differ substantially from these figures. Testing their own supply remains the key step to understanding individual water quality.

How do public-system records differ from private-well tests in what they establish?

Public water systems regularly test and report water quality and meet federal health standards, providing documented safety for the served area. In contrast, private wells are the homeowner’s responsibility to test because conditions can vary greatly from one well to another, even within the same aquifer. Regional records like those from the U.S. Geological Survey give useful environmental context but cannot substitute for direct testing of household water. This distinction is crucial for homeowners whose equipment has failed to ensure treatment matches actual water conditions.

For households in Hennepin County relying on aquifer 112GSSG, the Autotrol Total Well Chlorination System offers a proven treatment option with a 32,000 grain capacity to support residential water needs. It ships ready to configure and can help restore high-quality water performance after previous equipment failure, addressing concerns revealed by local water quality data and personal testing.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2016-09-08. 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 Chloride in the 112GSSG aquifer (Hennepin County): 23 results from 20 wells, median 76.5 mg/L, range 2.28-328.0 mg/L; 2 above an AESTHETIC secondary standard only (secondary standard 250.0 mg/L (aesthetic)) - not a health finding