When government pH data sets aesthetic standards separate from health standards
Water pH is measured to assess properties like taste, corrosivity, and potential for staining, rather than direct health risk. The U.S. Environmental Protection Agency defines a recommended pH range between 6.5 and 8.5 as a secondary standard focused on aesthetics and plumbing protection. This standard is not a legal health limit but a guideline addressing water's chemical character that can impact fixtures and appearance.
If the St. Clair County aquifer pH measurements fall within the EPA secondary range
Recent groundwater data from U.S. Geological Survey sampling in St. Clair County’s aquifer 112SDGV shows pH readings ranging from 7.7 to 8.1 standard units with a median of 7.8. All three sampled wells reported pH values comfortably within the recommended aesthetic band. This indicates that, based on these samples, water acidity is unlikely to be a widespread concern in this aquifer at typical depths near 127 feet.
If you read the median and range in the government record as a homeowner
The median pH of 7.8 suggests that half the sampled measurements are above and half below this value, a neutral to mildly basic condition. The narrow range between 7.7 and 8.1 means that acidity or alkalinity variations are minor in these samples, which typically correlates with minimal risk to household plumbing or water taste arising from pH alone. However, these figures are aggregate data for the area and not a precise indicator of any individual well.
If you consider well depth or source type as factors in your water's pH
The sampled wells were approximately 127 feet deep, representing groundwater drawn from a specific aquifer stratum. Shallow wells, drilled differently, or surface water sources may have notably different pH characteristics. Your household water's acidity depends on your own well's conditions, geological factors, and local water table dynamics, which government monitoring does not directly measure.
If you want to understand terms like 'detected,' 'median,' and 'range' in the sampling results
- Detected: The constituent, in this case pH, was measured and reported in all sampled results.
- Median: The middle value of all results sorted numerically, giving a central tendency.
- Range: The spread between the lowest and highest pH readings recorded.
If you plan to test your household water’s pH with laboratory analysis
A certified lab test will report your specific well or tap water’s pH as a numeric value, along with quality control notes. This personalized test is necessary to know your water’s acidity precisely. The lab will describe if the pH is below, within, or above EPA’s aesthetic range but will not classify the water as unsafe based solely on pH, as that is a secondary standard.
For households in St. Clair County concerned about acidic water below the aesthetic range, the Pentair Acidic / Low-pH Water Filter ships ready to configure and offers a reliable approach to adjusting pH to a more neutral balance. It is designed to address acidity levels recorded in private well water, ensuring your water is comfortable for daily use while respecting the inherent characteristics of your source.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2022-10-20. 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 112SDGV aquifer (St. Clair County): 3 results from 1 wells, median 7.8 standard units, range 7.7-8.1 standard units; EPA secondary standard for pH is 6.5-8.5 (aesthetic/corrosivity, not health-based); 0 of 3 sampled results fell below 6.5
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