Government Sampling: Number of Wells and Its Implications
The pH data available for Dakota County's aquifer 110SAGR come from six samples collected across four separate wells. This sampling, conducted between August 2014 and September 2022, reflects results from wells ranging 80 to 260 feet deep. While these samples provide a useful overview of the area’s groundwater, the limited number of wells and samples means that the data represent regional tendencies rather than detailed local variations at any specific home or well location.
Seasonal and Multi-Year Variation in pH Levels
The pH values recorded over this multi-year period range from 6.7 to 7.1 standard units, with a median of 6.95. These measurements do not show readings below 6.5, the lower boundary of the EPA’s secondary standard for pH. This range suggests that, over the years and seasons sampled, pH in this part of the aquifer has remained relatively stable. However, individual wells may experience fluctuations not captured in this dataset.
Household Fixtures and Appliances Most Sensitive to Acidic Water
Water with a low pH, or acidic water, can first affect metal plumbing components and appliances that use water regularly, such as water heaters, dishwashers, and ice makers. Acidic water may accelerate corrosion, potentially leading to metal leaching or staining and reducing the longevity of these fixtures. Monitoring water quality at household entry points can help identify when treatment is warranted to protect these systems.
Understanding the Measured pH Range Against EPA Secondary Standards
The EPA secondary standard for pH in drinking water is set between 6.5 and 8.5, primarily to address aesthetic concerns and corrosion control rather than health risks. The samples from Dakota County’s aquifer fall within this range, indicating no identified regional exceedance of this standard. It is important to note that detection of pH values within this range does not imply the water is unsafe, nor does it reveal the exact pH at an individual household's tap without specific testing.
Matching Treatment Capacity to Household Water Use
When considering treatment options for acidic water, the system’s capacity to handle daily water consumption is critical. Estimating average household demand—typically measured in gallons per day—and comparing it against treatment system specifications can help select an appropriate solution. This ensures effective neutralization of low-pH water without undersizing the treatment equipment or overspending on capacity beyond actual needs.
Interpreting Terms: Detected, Median, and Range in Water Sampling
In the context of these government samples, 'detected' means the pH was measurable within the tested range in all six results. 'Median' refers to the middle value in the dataset, which is 6.95 standard units, offering a central tendency rather than a definitive constant level. The 'range' spans from the lowest to highest measurement (6.7 to 7.1), reflecting natural variability in groundwater chemistry across different wells and times.
For residents of Dakota County exploring solutions to acidic water, testing their own well water is an essential step to determine specific conditions. For addressing low-pH water, the C-Series Acidic / Low-pH Water Filter ships ready to configure and is designed to neutralize acidic water efficiently for residential use, aligning treatment capacity with household demand.
This summary is based on groundwater sampling of four wells in Dakota County’s aquifer 110SAGR, as documented by the U.S. Geological Survey between 2014 and 2022 (https://waterdata.usgs.gov/monitoring-location/422524096250801/).
Where this information comes from
Source: USGS groundwater sampling. Sampled 2022-09-13. 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 pH in the 110SAGR aquifer (Dakota County): 6 results from 4 wells, median 6.95 standard units, range 6.7-7.1 standard units; EPA secondary standard for pH is 6.5-8.5 (aesthetic/corrosivity, not health-based); 0 of 6 sampled results fell below 6.5