Skip to Content

Cyanobacterial Harmful Algae Blooms

Drinking water questions?

Call us at (541) 685-7861, or send us an email.

Cyanobacteria, formerly referred to as blue-green algae, are found naturally in lakes, rivers, ponds and other surface waters. When certain conditions exist, such as warm water containing an abundance of nutrients, they can rapidly form cyanobacterial harmful algal blooms (cyanoHABs). Some cyanoHABs are capable of producing toxins, called cyanotoxins, which can pose health risks to humans and animals through drinking water and recreational water exposure.



We are required by the Oregon Health Authoirty to monitor for cyanotoxins biweekly from May 1 to October 31 each year. In addition to the required sampling site, we also monitor several sites within the McKenzie Watershed. This comprehensive monitoring allows us to provide information about both recreational exposure in the reservoirs and river as well as potential drinking water exposure at the Hayden Bridge Water Filtration Plant.

Related Programs

More about safe drinking water

The U.S. Environmental Protection Agency provides additional information about drinking water.

Oregon Health Authority
Oregon drinking water services

Oregon drinking water services

Learn more about drinking water from the Oregon Health Authority.