Perry Creek is a designated trout stream and a tributary of the Au Sable River, which is a designated Scenic River under the Federal Wild and Scenic Rivers Act. Perry Creek connects with the Au Sable River approximately 2.5 miles south of the known Hoskins Manufacturing groundwater contamination discharge area.

The DNRE investigation has revealed that the groundwater contamination is flowing into Perry Creek. The portion of Perry Creek the groundwater plume is discharging into is surrounded by a cedar swamp and thick brushy vegetation, with no visible indication in the vegetation or in the surface water that contamination is present. Laboratory analysis indicates perchloroethylene (PCE), hexavalent chromium and chlorides are entering into this groundwater-fed creek. Concentrations of PCE have been detected in the groundwater as high as 500 parts per billion (most protective state groundwater criteria is 5 parts per billion), hexavalent chromium at 7,900 ppb (most protective state groundwater criteria is 11 ppb) and chlorides at 448,000 ppb (most protective state groundwater criteria is 250,000 ppb).