California Water Service, the largest subsidiary of California Water Service Group, has received approval for the company’s first patent, for a device that helps protect the environment by preventing overflows of chlorinated water that are potentially harmful to fish and wildlife. Before a tank overflow dechlorinating assembly and method technology was created, chlorinated water from storage tanks could overflow into creeks, rivers, and streams if the tank’s electronic shutoff mechanism ever failed. With no available backup safety device on the market, the chlorinated water overflows could negatively impact the local environment. The invention of the assembly provides a second layer of security and a tailor-made solution for water storage tanks, as it attaches directly to the overflow pipe and delivers tablets, held inside the unit, to dechlorinate any overflowing water.