For single-family residential customers, the total water budget for each two-month billing period is based on your individual indoor (Residential Tier 1) and outdoor (Residential Tier 2) allocations.
The indoor water allocation for single-family residential customers is calculated to accommodate four (4) people per household, based on U.S. Census and State of California Department of Finance data. Residential customers are allocated 52.5 gallons of water per person per day at the Residential Tier 1 rate, which is consistent with the State of California standard for efficient indoor water use.
The outdoor water allocation for single-family residential customers is calculated according to a property's estimated irrigated area, based on County of San Bernardino parcel data (lot size, house footprint) and estimated hardscape (garages/carports, driveway, sidewalks, etc.). Residential customers are allocated 24 gallons per square foot of irrigated area at the Residential Tier 2 rate. The estimated irrigable area is the parcel lot size less the dwelling footprint less 30% for hardscape. The allocation is consistent with the State efficiency standards for outdoor water use on mixed residential landscapes (~80% grass, ~20% water-efficient plants). The outdoor water allocation is distributed per billing period based on the seasonal water needs of plants (more in the warmer months, less in the cooler months).
For dedicated irrigation metered customers (outdoor use only), the water budget for each two-month billing period is based on an outdoor water allocation calculated according to a property's lot size or measured irrigated area. Irrigation customers are allocated 28 gallons per square foot of irrigated area at the Irrigation Tier 1 rate, which is consistent with the State of California standard for efficient outdoor water use on large non-residential landscapes (100% grass).