When charges and fees are based upon water usage, such charges and fees shall be applied against the total amount of water used from all sources unless, in the opinion of the agency, significant portions of water received are not discharged to the community sewer. The total amount of waste used from public and private sources will be determined by means of public meters or private meters, installed and maintained at the expense of the user and approved by the agency.
When charges and fees are based upon water usage and where, in the opinion of the agency, significant portions of water received from any metered source do not flow into the community sewer because of the principal activity of the user or removal by other means, the charges and fees will be applied against the volume of water discharged from such premises into the community sewer. Written notification and proof of the diversion of water must be provided by the user, and approved by the agency, if the user is to avoid the application of the charges and fees against the total amount of water use from all sources. The user may install a meter of a type and at a location approved by the agency and at the user's expense. Such meters shall be maintained at the expense of the user and be tested for accuracy at the expense of the user when deemed necessary by the Administrator.
A. 
Users without source meters. For users where, in the opinion of the agency, it is unnecessary or impractical to install meters, the charges and fees may be based upon an estimate of the volume to be discharged prepared by the agency. A Rational Method will be used to estimate the quantity of wastewater discharged and may consider such factors as the number of fixtures, seating capacity, population equivalent, annual production of goods and services or such other determinations of water use necessary to estimate the wastewater volume discharged. The agency reserves the right to enter any premises for the purpose of estimating and measuring water or wastewater usage.
B. 
Users with source meters. For users who, in the opinion of the agency, divert a significant portion of their flow from a community sewer, the charges and fees may be based upon an estimate of the flow and volume to be discharged, prepared by the user and approved by the agency, provided that the user obtains a wastewater discharge permit and pays the applicable charges and fees. The estimate must include the method of calculations used to determine the wastewater volume and may consider such factors as the number of fixtures, seating capacity, population equivalent, annual production of goods and services or such other determinations of water use necessary to estimate the wastewater volume discharged.