This appears to me to the raw sample data https://www.epa.gov/sites/production/files/2015-09/ucmr-3-occurrence-data.zip https://www.epa.gov/sites/production/fil

This appears to me to the raw sample data https://www.epa.gov/sites/production/files/2015-09/ucmr-3-occurrence-data.zip https://www.epa.gov/sites/production/files/2015-09/ucmr-3-oc... The UCMR3_All.txt file inside looks to have a fairly nice, denormalized set of samples with location names, dates, and detections.