Protecting Public Health and the Environment.

Recreation Water Quality Health Advisories

This page provides information related to current recreation water quality health advisories involving cyanobacteria harmful algal blooms (HAB) and E. coli bacteria. The map and information table are updated with the most current information as health advisories are issued and lifted throughout the season.


Remember: Only a fraction of all water bodies in Idaho are monitored due to limited physical and monetary resources. The absence of an advisory is not an indication that a HAB or E. coli is not present at a water body. You are your own best advocate when ensuring your safety, and that of your family and pets. Be aware and "when in doubt, stay out."









Click pin for detailed information. Active HAB Advisory: Active E. coli Advisory: Lifted Advisory:

Active Harmful Algal Bloom Advisories

County Waterbody Date Issued Dominant Taxa DEQ Contact
Kootenai Fernan Lake 7/25/2019 Dolichospermum, Woronichinia Kristin Larson, Coeur d'Alene Regional Office, 208-769-1422

Lifted Harmful Algal Bloom Advisories

County Waterbody Date Issued Date Lifted
Washington Brownlee Reservoir 7/16/2019 9/12/2019
Twin Falls Salmon Falls Creek Reservoir 7/9/2019 10/21/2019
Camas Mormon Reservoir 7/25/2019 12/11/2019
Kootenai Twin Lakes 7/29/2019 9/20/2019
Ada Blacks Creek Reservoir 7/31/2019 11/26/2019
Elmore Mountain Home Reservoir 7/31/2019 11/26/2019
Ada Indian Creek Reservoir 7/31/2019 11/26/2019
Adams Big Bar to Hells Canyon Dam 8/9/2019 9/27/2019
Blaine Magic Reservoir 8/9/2019 10/8/2019
Canyon Lake Lowell 8/15/2019 11/4/2019
Elmore Little Camas Reservoir 8/16/2019 11/26/2019
Gooding Thorn Creek Reservoir 8/23/2019 12/11/2019
Valley Cascade Reservoir 9/6/2019 11/4/2019
Latah Hordemann Pond 9/13/2019 12/5/2019
Lewis Winchester Lake 9/27/2019 2/4/2020
There are no current E. coli advisories at this time.



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Report a Bloom

While you're recreating, notify us of a possible harmful algal bloom. You can contact one of our six regional offices, send an email to, or download the bloomWatch app. To help us investigate, please provide photos and water body location.

Download the bloomWatch app to learn what to look for and report what you found. Learn more.

Additional Information

Related Pages

Cyanobacteria Harmful Algal Blooms

Cyanotoxins: Information for Public Water Systems