Total Maximum Daily Loads (TMDL)

Events & Public Meetings

Water Quality Improvement Plan Addendums for Hickory Grove Lake and Otter Creek Lake available for public review

Iowans interested in the addendums to two DNR studies to improve water quality in two Iowa lakes can view a presentation on the Iowa DNR’s YouTube channel.

March 26, 2026

A simple image of a microphone at the front of a busy conference room.

Total Maximum Daily Loads (TMDL)

Events & Public Meetings

Water Quality Improvement Plan Addendums for Green Valley Lake, Meadow Lake, and Lake Anita available for public review

Iowans interested in the addendums to three DNR studies to improve water quality in three Iowa lakes can view a presentation on the Iowa DNR’s YouTube channel.

May 29, 2025

Total Maximum Daily Loads (TMDL)

Events & Public Meetings

Big Hollow Lake Water Quality Improvement Plan presentation available for public review

A DNR study to improve water quality in Big Hollow Lake in Des Moines County is available for public review on the IowaDNR's YouTube channel.

May 1, 2025

This image shows a sign of Big Hollow Recreation Area in Des Moines County.

Total Maximum Daily Loads (TMDL)

Water Quality Improvement Plans

Water quality improvement plans investigate streams and lakes on Iowa's impaired waters list. The goal is to improve the quality of our water sources.

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Total Maximum Daily Loads (TMDL)

Total Maximum Daily Loads (TMDL)

Water Quality Improvement Plan Addendums for Hickory Grove Lake and Otter Creek Lake available for public review

Water Quality Improvement Plan Addendums for Green Valley Lake, Meadow Lake, and Lake Anita available for public review

Big Hollow Lake Water Quality Improvement Plan presentation available for public review

Water Quality Improvement Plans

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