What percentage of samples in the study area exceeded the public drinking water standards for arsenic and uranium?
The results of 478 private well samples from 116 towns that were collected and analyzed for the USGS study are as follows: • approximately 13% of the samples collected from randomly selected well locations exceeded the 10 ppb public drinking water standard for arsenic; and, • less than 3% of all samples collected exceeded the 30 ppb public drinking water standard for uranium.
