The Northwest Arkansas Conservation Authority (NACA), was founded pursuant to Arkansas Code Annotated 14-233-101, et seq, the "Joint County and Municipal Solid Waste Disposal Act." Currently, ten Northwest Arkansas cities have joined NACA - Bentonville, Springdale, Rogers, Lowell, Bethel Heights, Cave Springs, Elm Springs, Highfill, Centerton, and Tontitown.
NACA's principal goals are to develop and implement cost-effective regional solutions to the challenges of providing environmentally sound wastewater and biosolids infrastructure and watershed management.