If you have read a water quality report for St. Charles, you may have noticed that the pH of the tap water is listed as unusually high. The St. Louis side of the county shows a similar reading. That line can look alarming on paper, but it mostly describes how the water behaves, not a warning that calls for immediate action. Here is how to read it and what to check at home.
What pH measures
pH is a scale that describes how acidic or alkaline water is. The midpoint of the scale is neutral. Readings below the midpoint are acidic, and readings above it are alkaline, sometimes called basic. Because the scale is logarithmic, small changes on it reflect larger changes in water chemistry. A high reading for drinking water means the water is on the alkaline side, which is the direction the St. Charles report points.
What a high reading can mean in daily use
Alkaline water is not a problem for most household uses, but homeowners often notice a few things:
- A slippery or soapy feel on the skin after showering, which can happen when soap does not rinse away as easily.
- A flat or slightly bitter taste in drinking water, coffee, or tea.
- Film or cloudy deposits on fixtures, especially where the water is also hard, as local reports describe for St. Charles.
- Chlorine working less efficiently at higher pH, which is one reason utilities keep a close watch on this number.
Check your own tap before you act
- Start with the utility's most recent annual water quality report for your address. Look for the pH line and any notes about hardness or disinfection.
- Test at your kitchen tap with a home test kit or a certified lab. Test strips are quick but less precise, so use a lab when you need a dependable reading.
- Collect one sample after running the cold tap for a few minutes, and a second sample from a tap that has sat overnight. Compare the two, because standing water can change.
- Record where and when each sample was taken, and keep the lab sheet with the sample label.
- Note whether your home has a water softener, filter, or other treatment equipment, since these can change what comes out of certain taps.
If you have a private well
Some homes near St. Charles draw from private wells that tap the Missouri River alluvial aquifer. Well water can differ noticeably from the city supply, and its pH depends on local geology, so the utility report does not describe it. Test the well directly, and include pH with hardness, iron, manganese, and bacteria if you have not tested recently. Ask the lab to explain each result in plain terms.
What to do with the result
A reading that matches the utility report is simply your baseline. Consider a treatment step only if your testing shows a problem you want to fix, such as staining, a taste you dislike, or scale on fixtures. Some approaches adjust pH directly, while others address hardness or taste. The right choice depends on what you measured and what you want the water to do in your home. If you are unsure, bring your lab results to a qualified water professional and ask for a written explanation before you buy anything.
Keep the report and your sample results on file. Local readings can change over time, and a clear baseline makes it easier to spot a shift later, whether you live in an older house or a newer one.