Understanding Public Water Records Versus Private Well Testing
When faced with concerns about acidic water, many homeowners in St. Clair County wonder how to interpret available data. The U.S. Geological Survey provides groundwater sampling results for aquifer 112SDGV within this county. These results represent measurements taken from selected wells in the area, not from individual household wells or taps. Thus, they offer an overview of regional water conditions, rather than a definitive statement about any single home's water chemistry.
Interpreting Median and Range Values for pH in Your Home Context
The data collected from 2016 to 2022 in St. Clair County show a median pH of 7.8 standard units, with a range between 7.7 and 8.1 standard units. This range reflects the natural variation observed across sampled wells at depths of approximately 127 feet. For a homeowner, this means typical groundwater in this aquifer has a pH slightly above neutral, which is not acidic. However, since these are area-level measures, your household water's pH could vary and should be tested if concerns persist.
Potential Effects of Untreated Acidic Water Over Time
If water with a pH lower than about 6.5 is present and left untreated for multiple years, it may gradually contribute to the corrosion of plumbing materials and fixtures. This could lead to metal leaching and staining, as well as possible damage to household water systems. Recognizing and addressing acidic water early can help preserve plumbing integrity and maintain water quality for household use.
What the pH Range Means Compared to Federal Guidelines
The Environmental Protection Agency’s secondary standard for pH in water is between 6.5 and 8.5 standard units. This standard addresses aesthetic and corrosion-related factors rather than health risks. The sampled wells’ pH in St. Clair County fall well within this range, and no readings were below 6.5. That indicates acidic water is not prevalent in these measurements. Yet, these secondary standards do not establish health-based safety limits, so they do not directly indicate unsafe water.
Differentiating Aesthetic Secondary Standards from Health-Based Limits
Secondary standards like the EPA’s pH range focus on qualities affecting the taste, appearance, and plumbing compatibility of water rather than health effects. Acidic water, indicated by low pH, mainly raises concerns about corrosivity and the potential for plumbing wear. Health-based water standards cover contaminants that pose direct risks to human health and are managed separately. Understanding this distinction helps prioritize what water characteristics to monitor and how to address them.
Steps to Rule Out Acidic Water Issues in Your Household
- Start by visually checking for blue-green stains on sinks and fixtures, which may suggest corrosive water.
- Test your water’s pH with an affordable home kit for a preliminary indication.
- If preliminary pH results show acidity (below 6.5), seek a professional laboratory analysis for precise measurement.
- Consider testing water chemistry elements related to corrosion potential if acidity is confirmed.
Each step narrows down whether acidic water is a concern for your household and informs the need for further evaluation or treatment.
What Not to Conclude from Area Water Data Alone
The regional groundwater pH data for St. Clair County’s aquifer 112SDGV show no occurrence of acidic conditions below the EPA secondary standard. However, this does not guarantee that your household water shares these characteristics. Only direct testing of your own water can establish the pH and its effect on your plumbing. If acidic water is confirmed, the C-Series Acidic / Low-pH Water Filter ships ready to configure for residential use, providing treatment designed specifically for addressing low-pH water safely and effectively.
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