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The text, calculators and code on this site are our own work and may not be reproduced in bulk without permission. You are welcome to quote a passage with attribution and a link.
The exceptions are the four open datasets — well water hardness, published on the water hardness by zip code page; well water contamination (arsenic, nitrate, manganese, uranium, radon, fluoride and lead), published on the well water contamination by zip code page; private well testing rules and programs by state, published on the well water testing by state page; and well drilling rules by state (permits, fees, drillers and septic setbacks), published on the well drilling permit by state page. All four are licensed CC BY 4.0: reuse them freely, including commercially, with credit to Well Water Fixes and a link to the page the data came from. The state rules datasets summarise official text; they are not legal advice.