The Water Production Division provides potable water for the City of Decatur and the Village of Mt. Zion with a combined population of approximately 79,000 people.  Lake Decatur serves as the primary water source, with the DeWitt County well field and a former sand and gravel pit near the South Water Treatment Plant as emergency sources.  When in operation, the well field discharges water into the Sangamon River which then flows into Lake Decatur.  The Division operates and maintains the South Water Treatment Plant, Nitrate Removal Facility, Raw Water Pump Station, South Booster Pump Station, William Street Pump Station, well field, three elevated water storage tanks, Lake Decatur (including the dam) and lime residuals storage lagoons. The Division has 21 full time positions.

The City of Decatur has been providing high quality drinking water since 1871. Our water treatment plant is constantly maintained, evaluated and upgraded to stay abreast of advancements in technology, health science and government regulations.  The water testing laboratory is the heart of our quality assurance program, with over 1,050 water samples analyzed each week.  Through proactive planning, efficiency in operations, and a focus on service excellence, we will continue to provide our customers with high quality drinking water at an exceptionally low cost.

Water Production Division – South Water Treatment Plant
1155 S. Martin Luther King Jr. Dr., Decatur, IL 62521
Office Hours: 8:00am to 4:30pm Weekdays
For information call (217) 424-2834