A detailed analysis of multi-family units (apartments, accessory dwellings, etc.) was completed in 2023. The analysis showed that a multi-family unit uses 85% of the water that a single family residence uses. Thus, the base charge is 85% of a single family unit.
The recent update of Sewer Ordinance #32 (Wastewater Code) included a detailed analysis of demand flow for multi-family units – apartments, accessory dwellings, etc. The analysis showed that a multi-family unit uses 85% less water in the winter than a single family residence unit and, therefore, the demand flow for each multi-family unit is 0.85 ESFR units. This means that the bill for a multi-family unit is 85% of the full ESFR charge for a single family residence.