privatewelldata / Reports
Well water data reports
Latest: Week of Oct 19, 2026: arsenic & nitrate in 564 US counties, 74 Quebec municipalities (published 2026-10-19). Every number comes from our own summaries of official data, with the download date and method stated.
A short data summary every week, and a longer report every month. Each one has charts, the method, a CSV you can download and reuse with credit, and links to the county and municipality pages behind the numbers. Older editions stay online.
| Published | Report | Type |
|---|---|---|
| 2026-10-19 | Well water data summary, week of October 19, 2026: arsenic and nitrate in 564 US counties, Quebec well results | Weekly summary |
Where the numbers come from
- US county pagesarsenic and nitrate in sampled wells, USGS/EPA Water Quality Portal
- Quebec municipality pagesarsenic, manganese, uranium, fluoride, barium, Quebec PACES studies
- Data ruleshow results are cleaned, counted and hidden
- Data sources and licencesevery source, licence and check date