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Introduction: Water from Hennepin County’s Aquifer 112GSSG to Your Home

The groundwater serving residential households in Hennepin County comes primarily from aquifer 112GSSG. Water is drawn from depths mostly between 9 and 29 feet, traveling through soil and rock layers before reaching wells that supply homes. Understanding this aquifer’s characteristics helps clarify common water quality features such as corrosivity, which can affect household plumbing performance over time.

1. Differentiating Aesthetic Secondary Standards from Health-Based Limits

The chloride concentrations measured in this area range widely—from as low as 2.28 mg/L to as high as 328 mg/L—based on USGS data covering 23 samples from 20 wells between 2011 and 2016. Importantly, chloride levels above the secondary standard of 250 mg/L relate only to taste, odor, or staining concerns and do not indicate health risks or violations of legal standards. This distinction is crucial: while elevated chloride might affect the aesthetics of water or contribute to pipe corrosion, it does not reflect a safety hazard.

2. Additional Considerations Beyond Household Needs for Commercial or Industrial Users

Although this page focuses on residential households, it is essential to note that commercial and industrial water users have further questions about capacity, continuous flow demands, and system compatibility. These users must consider scale, operational continuity, and regulatory compliance that extend beyond the scope of household water treatment challenges.

3. Public System Records vs. Private Well Testing

The USGS data represent area-wide groundwater conditions rather than individual well tests. While public system water quality reports summarize broad sampling results indicating general water characteristics in the aquifer, private well owners must conduct their specific water analysis to determine their water chemistry accurately. Public records provide useful context but cannot substitute for detailed local testing that reveals an individual household’s water condition.

4. How Chloride and Corrosive Factors Enter Groundwater in Hennepin County

Chloride in this region infiltrates groundwater mainly through natural processes and human activities such as road salt application. Elevated chloride levels can contribute to water corrosivity, which accelerates deterioration of plumbing materials. Corrosive water may result in metal leaching, pinhole leaks, and shortened equipment life despite existing water treatment efforts. Recognizing these sources is key to managing their impacts effectively.

5. The Data Behind These Observations: Sample Size and Interpretation

The findings rely on 23 samples taken from 20 wells over five years, providing a reasonable overview of the aquifer’s chlorine presence but limited in scope for exact household predictions. This small sample set captures variations within the local groundwater but does not replace direct testing of your home’s water supply, which is necessary to assess specific corrosiveness and treatment needs.

Summary

This page walked through the interpretation of Hennepin County’s groundwater data emphasizing the difference between aesthetic concerns and safety limits, the scale of data relative to individual wells, and the sources of corrosive components in water. Households facing challenges with corrosive water that current equipment cannot fully manage may consider advanced options like the Pentair Corrosive Water Damaging Pipes Filter, which ships ready to configure for effective protection.

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