On May 22, EPA issued its “ Recommended human health recreational ambient water quality criteria or swimming advisories for Microcystins and Cylindrospermopsin .” This document is currently in prepublication and should officially appear in the Federal Register in the next few days. It provides recommendations which states and tribes may adopt in their Clean Water Act programs. EPA’s recommendation for recreational exposure in ambient water is no greater than 8 µg/L for total microcystins and 15 µg/L for cylindrospermopsin. EPA recommends: • Issuing a swimming advisory (beach closure) based on any single-day exceedance; and • Considering a water body impaired if there are three or more exceedances in a year based on independent 10-day monitoring windows. EPA is assuming states will adapt current monitoring practices to these criteria. These criteria are not for drinking water. Rather, they are based upon exposure for recreational “primary contact” activities, such as swimming, where people incidentally swallow small amounts of water. These criteria are meant to also be protective of “secondary contact” recreational activities, such as boating, where people may come into brief or accidental contact with the water. Technical guidance from EPA for drinking water for microcystins and cylindrospermopsin can be found in its 2015 Health Advisories , which have much lower levels than these recreational values. Health Advisories are non-enforceable. Utilities contacted by media or customers may find the following resources helpful: Recreational Water • EPA’s Communicating about Cyanobacterial Blooms and Toxins in Recreational Waters Drinking Water • DrinkTap.org’s Cylindrospermopsin webpage • DrinkTap.org’s Microcystins webpage • AWWA Water Science article on “ State approaches to addressing cyanotoxins in drinking water ” Questions can be directed to Adam Carpenter , AWWA’s manager of energy and environmental policy.