Or. Admin. Code § 860-037-0101
In general, wastewater service charges are based upon the volume of water delivered to the customer's property. The water meter serving the premises measures this volume. In cases where a significant volume of the water delivered to the premises is not returned to, or water or wastewater from another source is discharged to the wastewater system the customer may request, or the utility may require, special flow measuring devices to properly measure the volume of wastewater entering the wastewater system. Such special flow measuring devices must be furnished, installed, and maintained by and at the expense of the customer with the approval of the utility.
Or. Admin. Code § 860-037-0101
Stat. Auth.: ORS 183, 756 & 757
Stats. Implemented: ORS 756.040, 757.005 & 757.061