 ADC Cummins Unit has a retail population of 3,800, followed by Star City with 2,842, Gould with 1,041, and all others under 1,000 retail population served.The Arkansas Department of Environmental Quality (ADEQ) regulates and oversees wastewater treatment and discharge permits in the state.Lincoln County contains three municipal wastewater systems, and one active domestic NPDES permit for Cummins Unit.