In March 2018, a wastewater cost of service study was done which involved a comprehensive review of the District’s wastewater rate structure and long-range financial plan, and the calculation of cost of service based on the wastewater rates and connection fees. As one result of the study, Commercial customers were reclassified to better reflect cost of service principles and align with industry standards.
The structure remains the same, with Commercial I, Commercial II, and Commercial III customers. Commercial IV customers are significant users and are monitored individually and are their own class. The classifications are based on combined BOD (biochemical oxygen demand) and TSS (total suspended solids) strength in milligrams per liter (mg/L). To view the wastewater cost of service study report, please view the 2018 Wastewater Rate Study (PDF) on the Understand Wastewater Rates page on our website