Rincon del Diablo Municipal Water District provides sewer collection and wastewater treatment to approximately 750 parcels within the Harmony Grove Village sewer service area. The District levies the annual charge for providing these services as a line item on the parcel owner’s property tax bill from the San Diego County Treasurer – Tax Collector.
In 2025, the District performed a Sewer Cost of Service and Charge Study, which was approved by the Board of Directors at a Public Hearing in compliance with Proposition 218 requirements on July 22, 2025. As part of the Study, a five-year plan for sewer charges was adopted, from FY 2025-26 to FY 2029-30. Charges for sewer service are developed using cost of service principles.
For more information on the District’s recently adopted sewer service charges, please see the following:
- 2025 Sewer Cost of Service and Charge Study Final Report
- 2025 Sewer Charge Proposition 218 Notice (English)
- 2025 Sewer Charge Proposition 218 Notice (Spanish)
Sewer charges for each parcel are based upon a fixed charge per Equivalent Dwelling Unit (EDU), with 1 EDU being the equivalent of a typical single-family residence. Most of the parcels that receive sewer service from the District are single-family residences and pay the standard sewer charge for 1 EDU. A small number of larger parcels, such as parks, HOA common areas, public facilities, and mixed-use properties are assigned higher EDU values for greater impact on the system and pay a proportionally larger charge per year for sewer service.
Sewer Charges are adopted as follows:
| FY 25-26 | FY 26-27 | FY 27-28 | FY 28-29 | FY 29-30 | |
| Annual Sewer Charge per EDU | $896.53 | $1,031.01 | $1,128.95 | $1,236.20 | $1,353.64 |