Replacement of existing programmable logic controllers (PLCs) and serial data radios with new PLCs and new Ethernet radios in existing supervisory control and data acquisition (SCADA) control panels at the Iowa City Water Treatment Plant and several remote facilities including well houses, pump stations, ground storage reservoirs, and a radio tower. Installation of new OWNER-furnished Ethernet network switches in all control panels. Creation of a self-healing network communication ring at the water treatment plant using existing fiber optic cabling. Modification of existing PLC programming for several processes improvements and the removal of unused PLC code. Significant modification of the existing SCADA human machine interface (HMI) graphics software to improve graphical organization, improve the presentation of process data, and to incorporate controls for updated PLC programming.