How to Test the pH of Your Well Water
pH measures how acidic or basic your water is and influences corrosion and metal leaching. This guide explains testing and the normal range.
Quick Answer
pH measures how acidic or basic your water is on a 0 to 14 scale. The EPA secondary (aesthetic) range for drinking water is 6.5 to 8.5. Low (acidic) pH can corrode plumbing and leach metals like lead and copper, while high pH can cause scale and a bitter taste.
Why pH matters for well owners
pH is a secondary standard, so it is about aesthetics and plumbing rather than a direct health limit. But it matters indirectly: acidic water (low pH) is corrosive and can dissolve lead and copper from pipes and fixtures, raising those contaminants in your water.
| pH range | Meaning | Possible effect |
|---|---|---|
| Below 6.5 | Acidic | Corrosion, metal leaching, blue-green staining |
| 6.5 to 8.5 | Normal range | Generally stable water |
| Above 8.5 | Basic | Scale buildup, bitter taste |
How to test pH
- 1Collect a fresh sample, since pH can shift if water sits exposed to air.
- 2Use a laboratory for accurate results, especially if you also suspect corrosion or metal problems.
- 3If pH is low, test for lead and copper, since acidic water increases leaching.
- 4Discuss treatment such as a neutralizing filter with a water professional if pH is outside 6.5 to 8.5.
Low pH can raise lead and copper
Frequently asked questions
- Can I rely on a home pH test strip?
- Strips can give a rough indication, but for decisions about corrosion, metal leaching, or treatment you should confirm with a laboratory measurement.
Sources & references
- Secondary Drinking Water Standards: Guidance for Nuisance Chemicals — US EPA, accessed October 29, 2026
- Lead and Copper Rule — US EPA, accessed October 29, 2026
This guide is documentary research and general information, not a laboratory analysis or professional assessment of your specific well. See our disclaimer.