Most drinking water and wastewater utilities today depend on computer networks and automated control systems to operate and monitor processes such as treatment, testing and movement of water. These industrial control systems (ICSs) have improved drinking water and wastewater service and increased their reliability. However, this reliance on ICSs, such as Supervisory Control and Data Acquisition (SCADA), has left the Water Sector and other interdependent critical infrastructures, including energy, transportation and food and agriculture, potentially vulnerable to targeted cyber attacks or accidental cyber events. A cyber attack causing an interruption to drinking water and wastewater services could erode public confidence, or worse, produce significant public health and economic consequences. (EPA Cyber Security 101 for Water Utilities)