North Dakota's algal bloom crisis spreads to 20 waterbodies

Three more North Dakota lakes and dams now carry harmful algal bloom advisories as toxic blooms proliferate across the state.

Sep 17, 2026

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North Dakota's algal bloom crisis spreads to 20 waterbodies

Three more North Dakota lakes and dams now carry harmful algal bloom advisories as toxic blooms proliferate across the state.

In brief

Three more North Dakota lakes and dams now carry harmful algal bloom advisories as toxic blooms proliferate across the state. North Dakota residents should check water conditions before recreation and avoid contact with affected waterbodies, as harmful algal blooms continue to spread rapidly across the state…

Three more lakes added to bloom list

North Dakota's Department of Environmental Quality issued new harmful algal bloom advisories for Blacktail Dam, Horsehead Lake, and Larimore Dam, bringing the state total to 20 affected waterbodies.

Advisories vs warnings explained

Advisories mean a bloom is present in portions of a waterbody. Warnings indicate a bloom covers significant portions and toxin levels exceed safe recreational thresholds.

What causes harmful algal blooms

What causes harmful algal blooms

Harmful algal blooms, also called blue-green algae, develop quickly in warm, sunny weather and can produce cyanotoxins that sicken people, pets, and livestock through water contact or ingestion.

“Some blooms produce cyanotoxins that can make people, pets and livestock sick if the water is swallowed or touched.”

How to stay safe around blooms

Check water conditions before recreation, avoid swimming or drinking from suspected bloom areas, and keep pets away. Rinse with fresh water immediately if contact occurs.

Report suspected blooms to DEQ

Contact North Dakota's Department of Environmental Quality at 701-328-5210, through tinyurl.com/WMP-HABS, or by emailing DEQ-HAB@nd.gov to report suspected blooms. Updates run May 1 through December 31.

What matters most

North Dakota residents should check water conditions before recreation and avoid contact with affected waterbodies, as harmful algal blooms continue to spread rapidly across the state.

Read the original on Valleynewslive

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