Sanitary District of Decatur, IL

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Decatur, IL
Sanitary District of Decatur, IL

The regional wastewater treatment authority for central Macon County.

06/17/2026

Before modern machinery and digital monitoring systems, SDD crews relied on manual labor, brick masonry, and hands-on engineering to build Decatur’s first sewer infrastructure. Many of the underground systems created in the 1920s helped lay the foundation for the wastewater network that still serves our community today.

It’s a reminder that protecting public health has always taken innovation, hard work, and long-term planning.

06/09/2026

SDD’s treatment capacity has grown dramatically over the years to support community growth and protect local waterways. Today, the system can handle up to 125 million gallons of flow during wet weather events.

06/05/2026

It’s World Environment Day! Take a look at some of the ways SDD helps protect our environment every day and support cleaner water and healthier communities across the area.

06/02/2026

June is National Rivers Month! In Decatur, the Sangamon River plays a huge role in our community by supporting local wildlife, outdoor recreation, and our environment as a whole.

Each day, SDD treats millions of gallons of wastewater before safely returning cleaned water back to the river system. From facility upgrades to advanced treatment and daily water quality monitoring, our work helps keep the Sangamon River healthy.

05/25/2026

Summer is here, and that means more time outside! From boating on the lake, watering the lawn, to just hanging out and enjoying the sunshine, SDD is here to help you make the most of your summer. ☀️

05/14/2026

Ever wonder what it takes to keep our community running smoothly? From the pipes beneath our streets to the treatment processes behind the scenes, the Sanitary District of Decatur manages a system designed to protect public health and keep our waterways clean. Here’s a look at the facilities that make it all happen.

05/11/2026

For assistance with sewer problems or odors, the Sanitary District of Decatur's 24/7 hotline is just a call away. Whether it’s a backup, odor complaint, or other urgent concerns, call 1-447-CALL-SDD anytime. We’re always ready to help.

05/08/2026

This photo shows SDD’s major expansion completed in 1993 after seven years of construction. The $23 million upgrade added 30 clarifier tanks across 90 acres, expanding capacity, improving efficiency, and supporting Decatur’s growth. It was a major step in modernizing the system to meet future needs.

05/06/2026

Some of the smallest creatures in the Sangamon River can tell us a lot about water quality! Macroinvertebrates, like mayflies and caddisflies, live in the water year-round and respond quickly to changes in their environment. Because they can’t easily move away, they’re a great way to understand how a river is doing over time.

That’s why monitoring and protecting water quality matters. At the Sanitary District of Decatur, our work helps support cleaner water and healthier habitats for these species, and for our community that depends on them.

04/22/2026

Earth day is a great reminder that protecting our environment starts with small, simple actions. 🌎 At SDD, caring for our waterways and treating wastewater responsibly is part of our commitment to keeping our community and environment healthy. Want to do your part? Swipe for a few simple tips that can help protect our water and keep things flowing smoothly.➡️

Address

Decatur, IL
62522

Website

https://sddcleanwater.org/

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