Of the 1231 groundwater samples ana

Of the 1231 groundwater samples analyzed, 28 (2.3%) had
detections ≥MDL of any of the pharmaceutical compounds tested
(data are tabulated in the Supplementary Material).
In the same set of 1231 groundwater samples, pesticides and pesticide degradates were
detected in 33% of the samples at concentrations greater than or equal
to the highest MDL used during the period samples were analyzed.
VOCs (solvents, fumigants, gasoline oxygenates, and refrigerants)
were detected in 23% of the samples, and THMs in 28% (Fig. 2).
The prevalence of these 14 pharmaceuticals in aquifers used for public
drinking water supply in California is significantly lower than that of
pesticides, VOCs, or trihalomethanes (contingency table tests,
pb0.001).