The City of Elmhurst will be performing a dye-tracing study in Salt Creek near the Water Reclamation Facility, between St. Charles Road and Butterfield Road, on September 21. This will involve releasing non-toxic colored dye into the waterway, which will propagate downstream and eventually dissipate. The dye that will be used is harmless and will not cause ecological damage to plant or animal life within or near Salt Creek. The study will be used to better understand the creek’s mixing conditions near the Water Reclamation Facility.