Recent news reported by the NY Times indicates that regulation is working and hazards from pesticide residues in water supplies have significantly diminished. The Times' Michael Wines points out:
"The results nevertheless documented a striking decline in dangers to humans from pesticide pollution. From 1992 to 2001, 17 percent of agricultural streams and 5 percent of other streams contained at least one pesticide whose average annual concentration was above the maximum contaminant level for drinking water. But in the second decade, from 2002 to 2011, the survey found dangerous pesticide concentrations in only one stream nationwide."
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