Advisory, Sampling, and LPHA Guidance

Advisory Guidelines for Harmful Cyanobacteria Blooms in Recreational Waters

Outlines OHA's criteria for issuing and lifting public health advisories. In 2026, OHA is piloting an alternative recreational advisory protocol.

Interstate Technology and Regulatory Council (ITRC) Harmful Cyanobacterial Bloom Resource Guide

This resource provides additional guidance for preventing and managing cyanoHABs. It includes a video on identifying potential cyanoHABs.

Provides guidance for lake managers who intend to monitor waterbodies when potential cyanoHABs are detected.

Updated Document Coming Soon: CyanoHAB Guidance for Local Public Health Authorities 

Provides comprehensive information on cyanobacteria, cyanotoxins, symptoms, outreach, and how each LPHA can partner with OHA when blooms are identified in their counties.