Water service must not be used in such a way as to cause unusual or abnormal fluctuations or disturbances to the system. In the event of a use by the customer to cause abnormal or unusual fluctuations or disturbances to the water supply system the department shall give notice to the customer that the offending use must cease, or service will be discontinued, and in the event such use is not discontinued or the customer's consumption is not adjusted so as to end the unusual or abnormal fluctuations or disturbances to the system, water service will be discontinued to the customer. (1970 Code, § 13-107)