Protect it. Pass it on.

Collaborating to Improve Water Quality and Habitat in Our Urban Watershed

The MWMO watershed encompasses 25,309 acres (39.5 square miles) of fully developed urban lands and waters. We partner with our member communities to invest in green infrastructure that captures, cleans and reuses stormwater runoff.

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Asters and bees

Discover spring plant sales and green yard tips in the MWMO’s 2025 Annual Spring Guide.

Learn how stormwater runoff impacts water quality and how watershed organizations help.

Rain garden planting volunteers raising their arms in celebration.

Submit your address to find out if you’re in the MWMO’s watershed.

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Download an MWMO Map (PDF)

Community members flower pounding natural pigment onto fabric at a workshop

MWMO Newsletter — July 2025 — Growing Smarter Edition 🌱

In This Issue: The More It Rains, the More We Learn, New Art Exhibit: Botanical Impressions arrives at MWMO, Upcoming Events, and More Read the Newsletter
August 7, 2025

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MWMO staff in high-visibility vests taking samples from a storm drain underneath a tree trench in Hoyer Heights.

Rain Gardens Are Soft Infrastructure Doing Hard Work

Some areas saw over six inches of rain in just one day last weekend. All that water has to go somewhere, making rain gardens more important than ever.
July 31, 2025
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Mississippi River Green Team planting native species at Columbia Golf Course

MWMO Newsletter — June 2025 — Groundwork Edition 🛠️

In This Issue: What is a Feasibility Study?, Construction at Sylvan Hills Park, Upcoming Events, and More Read the Newsletter
July 1, 2025

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