DDW Requests Cyanotoxin NLs

On February 4, 2021 the State Water Resources Control Board Division of Drinking Water (DDW) submitted the enclosed request ( DDW Request to OEHAA for Cyanotoxin NLs_2021-02-04 ) to the Office of Environmental Health Hazard Assessment (OEHHA) to develop recommendations for Notification Levels (NLs) for the following four cyanotoxins:

  1. Microcystins
  2. Cylindrospermopsin
  3. Anatoxin-a (“if information supports” development of an NL)
  4. Saxitoxins (“if information supports” development of an NL)

In 2015 EPA published 10-day Health Advisories (HAs) for microcystins and cylindrospermopsin.  The 10-day HA for microcystins for bottle fed infants (up to school age) is 0.3 µg/L.  The 10-day HA for adults is 1.6 µg/L.  The 10-day HA for cylindrospermopsin for bottle fed infants (up to school age) is 0.7 µg/L.  The 10-day HA for adults is 3 µg/L.

DDW requests that OEHHA review the EPA’s HAs for microcystins and cylindrospermopsin as part of this process.

Finally, the DDW letter cites recent World Health Organization (WHO) background documents for the four cyanotoxins (copies of the WHO documents are here: WHO Cylindrospermopsin Background WHO_Anatoxin-a Background_Dec 2020 WHO_Microcystins Background_Dec 2020 WHO_Saxitoxins Background  ).

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About Dan Askenaizer

Dr. Askenaizer leads WQTS’ work on regulatory compliance support for many of our water agencies clients. Dr. Askenaizer tracks water quality and treatment regulations at the Federal and State levels and provides regulatory updates to our clients. Dr. Askenaizer has strong expertise in the development of Regulatory Monitoring and Compliance Plans (RMCPs), which he has completed for a number of water agencies. He has also been working on a number of projects dealing with the development of distribution system monitoring plans and review of nitrification control strategies. Prior to joining WQTS, Dr. Askenaizer was the Water Quality Manager for the Glendale Water and Power. Under his leadership, the Water Quality Group conducted a demonstration-scale study of chlorite for nitrification control and a pilot-scale study of biological treatment for removal of nitrate. Dan has 30 years of experience working on projects dealing with regulatory, water quality and public health issues. Dan has given numerous presentations at workshops and round-tables across the country for water utilities. Dan was instrumental in developing and implementing a Mentoring Program for water staff and was involved in a Sustainable Development team.