Does Well ph Change Over Time

Asked March 8, 2019, 6:59 PM EST

Our well water was tested 15 years ago. I recently bought a water test kit and it shows a ph drop to 5. This does not seem possible as the samples that I sent to the lab 15 years ago were 6.5 and 6.6. Can well water ph change like that given no significant development in our area? It seems like the ph should be stable and the provided test strip is not accurate. I got the same result with a 2nd strip.

Snyder County Pennsylvania

3 Responses

Groundwater pH can change. I suggest you contact your local county or state agency that tests well water and/or Penn State Extension. I've provided links to EPA's site on private wells, PSU,
drinking water Extension specialistsas well as a newsletter from "The American
Well Owner." If your well water actually has a pH of 5 that is a concern (see below). A lab testing the well water pH is highly suggested compared to using test strips.

"Acidity in water is not in itself harmful to health. Many popular beverages have considerable acidity or alkalinity. The concern for acidity in drinking water is that even mildly acid water can dissolve lead or copper that may in plumbing pies and fixtures. In theory, there should be no lead content in homes built since 1987. However for millions of homes there is the potential for a problem. For this reason, the United States Environmental Protection Agency has determined that drinking water should have a pH between 6.5 and 8.5 in order to limit the concentration of dissolved contaminants from acidic waters or the build up of scale deposits from alkaline water. (Learn more about this situation at the Trust website page "

Thank you. I appreciate the quality response. Per your advice, I sent a bottled sample to the lab.

You're welcome. Pleasure helping out.