Management District

We are Offut Lake residents dedicated to preserving the natural beauty and resources of Offut Lake.

Agendas, Minutes, Newsletters, Slideshows

SOP, Charter, Petition, Resolution, OPMA

Weeds, Herbicides, Permits, Prescriptions, Public Notices

Lake Surveys, Maps, IAVMP

Education, FAQs, OPMA Training, About Offut Lake

Budget, Assessments, Grants, Contracts, RFPs

Our next treatment for submerged weeds will be on Monday, July 7th, 2025. Our herbicide contractor is Aquatechnex.

Herbicide Treatment Area

Area B-3 will be treated with Endothall on Tuesday, July 8th, 2025. (TREAMENT MAP)

Target species

Broad-leaf Pondweeds (Potamogeton spp.)

Treatment Notices

Signs will be posted the morning of treatment in all required areas.

Swimming Restrictions

Swimming restrictions are generally minimal. Most sources indicate a 24-hour restriction near the treatment area due to potential skin or eye irritation from concentrated endothall. Endothall dissipates rapidly after application, and is not known to accumulate in fish or animal tissue.

There is a drinking lake water use restriction from treated areas for 14-days for Humans and Domestic animals. This restriction is NOT for wells, but only for folks getting drinking water directly from the lake.

Please leave signs up for the full 14 days so pet-owners know not to let their pets drink lake water in posted areas. The dates will be on the signs.

Have questions? Contact us at: LINK

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