Low pH and Corrosive Well Water
Signs
Blue-green stains in sinks, pinhole leaks in copper pipes, and a metallic taste can mean corrosive water.
pH
pH runs from 0 to 14, with 7 neutral (USGS). EPA's secondary range for drinking water is 6.5–8.5. Water below that can corrode pipes.
Lead and copper
Corrosive water can dissolve lead and copper from pipes, solder and fixtures. EPA says there is no safe level of lead. If pH is low, test for lead and copper too.
Treatment
Penn State Extension describes acid neutralizing filters (calcite) and chemical feed systems. Retest after installation.
Sources
- USGS: pH and water
- EPA: Secondary drinking water standards
- Penn State Extension: Corrosive water problems
- EPA: Basic information about lead in drinking water (FAQ)
Questions
What pH should well water be?
EPA's secondary range is 6.5 to 8.5.
Free well water safety checklist
15 family-friendly steps based on CDC and EPA guidance. Print it, keep it on the fridge, and know when to call a certified lab.
More guides
- Flood Protection for Well Owners: Before, During and After a FloodRaise and seal the wellhead, know your pump shutoff, then disinfect and test with a certified lab after any flood.
- PFAS “Forever Chemicals” in Private Wells: Why You Should TestFederal PFAS rules protect public water systems — not private wells. Here’s what “forever chemicals” mean for well owners and how to get tested.
- Nitrates in Well Water and Blue Baby Syndrome: Who Must TestNitrate in well water can cause blue baby syndrome in infants. Learn who is at risk, when to test, and how to find a certified lab.
- Arsenic in Private Well Water: The Invisible Risk UndergroundArsenic in groundwater is often naturally occurring and invisible. USGS research shows millions of private-well users may be above the EPA drinking-water standard.