In order that single family domestic and residential users of sewage services shall not be penalized for the sprinkling of lawns during the months of June, July, and August of each year, the billing for sewage services for said user shall be based on water usage for the immediately preceding months of January, February and March.
In the event the water usage for said previous period shall be less than the water usage for the summer months, then the billing shall be based upon the usage for the January, February and March period prior to the summer billing period being billed.
In the event the water usage for the January, February and March period prior to the summer billing is greater than the water usage for said summer period, then the billing for sewage services shall be computed on the actual water used in the period for which the sewage service is being rendered.
Said sprinkling rate shall not apply to any premises which are partially or wholly used for commercial or industrial purposes.
In the event a portion of such premises shall be used for commercial or industrial purposes, the owner shall have the privilege of separating the water service so that the residential portion of the premises is served through a separate water meter, and in such case, the water usage as registered by the water meter serving such portion of the premises used for residential purposes would qualify under the sprinkling rate.