Global variations in pesticide regulations and health risk assessment of maximum concentration levels in drinking water

- At least 145 regulatory jurisdictions in 103 worldwide nations regulate pesticide MCLs in drinking water.
- For individual pesticides, drinking water MCLs often vary by 5-7 orders of magnitude.
- At least 162 MCLs for 23 of 25 pesticides are not sufficiently low to protect human health.
- Human health risk uncertainty limits and health risk characterization factors were developed to evaluate pesticide MCLs.