Sanitary District of Decatur, IL

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.

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.

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.

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. ☀️

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.

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.

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.

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.

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.➡️

Join us at the 45th Annual Festival of Spring! SDD will be at Rock Springs Conservation Area on Saturday, April 25 from 12–4 p.m. for this fun community event celebrating Earth Day and the arrival of spring. We’ll be there alongside other local organizations sharing information and resources focused on water, wildlife, and protecting our environment. Learn more here: https://bit.ly/4cfgsYq