Avon Lake Regional Water is responsible for protection of the public water system of Avon Lake from contamination due to backflow of contaminants through the water service connection. If, in the judgment of the CUE, a potential source of backflow and/or contamination exists, he shall give notice to the consumer to install such approved backflow prevention device(s) at each service connection to the premises. The consumer shall immediately install such approved devices at his expense; and failure, refusal, or inability on the part of the consumer to install the said devices immediately shall constitute grounds for the discontinuing of water service to the premises until said devices are installed.