Private well water

Sources and Methodology

For safety, regulation, and local facts, we prefer sources closest to the public responsibility and original evidence.

Source order

  1. Federal, state, county, and local government
  2. Certified laboratory directories
  3. Universities and peer-reviewed research
  4. Standards bodies
  5. Manufacturer documents for product facts
  6. Clearly labeled secondary evidence

Evidence labels

Documented: directly cited. Possible: needs testing. Editorial judgment: synthesis using stated criteria. Unknown: not verified.

Dates and limits

Time-sensitive pages show review dates. Sources can change, and articles cannot replace individual testing.

Last reviewed: September 7, 2026.