Complete Well Water Testing Guide: What to Test & How Often (2025)
2026-04-04 · 8 min read · Guide
Why Test Your Well Water?
Unlike public water systems, private wells are not regulated by the EPA. The responsibility for testing and maintaining water quality falls entirely on the well owner. The EPA recommends annual testing at minimum, but more frequent testing may be needed depending on your location and well conditions.
What to Test For
At minimum, test annually for: coliform bacteria, nitrates, pH, and total dissolved solids. Every 3-5 years, add tests for: arsenic, lead, radon, PFAS, volatile organic compounds, and hardness minerals. Test immediately after flooding, construction nearby, or changes in taste/odor/color.
Testing Methods
Contact your state health department or county extension office for certified labs. Home test kits provide quick screening but are not substitutes for lab analysis. Expect to pay $50-$400 depending on the panel. Use our state-by-state tool to see common contaminants in your area.
Our team analyzes data from EPA SDWIS & USGS to deliver accurate, up-to-date information. All data is verified and cross-referenced with official sources.