Water Quality Monitoring Data

The data in this database is considered provisional data, and it may not represent the final result. Final results are posted on EPA's water quality WQX database. See the qualifiers for codes related to the results; also, note that, unless otherwise indicated, metals values are from the dissolved fraction. We recommend that the downloadable version of the database be used for statistical and other mathematical analyses because of the additional information it contains.

Data from September 1990 to present is available on this website. Data previous to September 1990 can be found on EPA's website.

Water Quality Monitoring Data Search

Make your selection(s), then click the Search button. Scroll below search fields to view results. Search Tips

Station
Location
(Requires State)
Date Range