The new standard was introduced in 2001. Since then, the percentage of public water systems in violation fell from 1.3% in 2008 to 0.55% in 2017, researchers found. A few counties in California and Texas accounted for most of the violations.
from WebMD Health https://www.webmd.com/diet/news/20190913/stricter-arsenic-rule-made-drinking-water-safer?src=RSS_PUBLIC
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