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NOT FOR PUBLIC REVIEW 5.18 Water Resources

recycled water demand for slopes of approximately 1,008 afy (see Table 5.18-7). Consistent
with the Peer Review Report, the Project water demand includes a plant establishment factor
to account for water use required during the initial phases of landscape establishment.

Table 5.18-8 summarizes the Project’s buildout water demand, including approximately
6,788 afy of potable and 4,577 afy of recycled water use. Total demand will be approximately
11,365 afy. At full buildout, the Project’s total per capita water use will be approximately
177.5 gpcd.

TABLE 5.18-8
SUMMARY OF PROJECT BUILDOUT DEMAND
AND PER CAPITA WATER USE

Potable Demand (afy) 6,788
Recycled Demand (afy) 4,577
Total Water Demand (afy) 11,365
Buildout Population 57,150
Total Water Use (gpcd) 177.5
Source: Psomas 2017a

As discussed above, the General Plan Update Draft EIR and the AVIRWMP estimate per capita
urban water demand for the Antelope Valley and water districts serving the region (see
Table 5.18-8). The General Plan Update Draft EIR estimates the average 2035 per capita daily
water demand in the County, including Antelope Valley, at 142 gpcd to comply with the
State’s urban water use reduction mandates (DRP 2015c). The General Plan Update Final EIR
incorporates the AVAP Final EIR analysis, which projected water demands based on the
average AVIRWMP estimate for the Antelope Valley of 199 gpcd. The Project’s buildout
demand of approximately 177.5 gpcd is in the middle of and consistent with the range of
these projections. As shown in Table 5.18-5, the AVIRWMP estimates that in 2010 overall
regional water use averaged 199 gpcd. The AVIRWMP also notes that the 2010 levels may
decline to meet the State’s water reduction requirements, including the 20 percent urban
water use reduction by 2020 enacted by the State in 2009. As shown in Table 5.18-5, if the
regional water districts analyzed in the AVIRWMP reduced estimated 2010 urban demand
by 10 percent from 2010 levels regional water use would average about 179 afy. The
Project’s water demand is also consistent with these projections.

The Project will achieve higher levels of water use efficiency than in most existing Antelope
Valley developed areas because new development must utilize significantly more efficient
plumbing, technology, fixtures, appliances, and other water system equipment to comply
with applicable federal, State, and local regulations. The State’s provisional residential
indoor and other standards that would be implemented under Executive Order B-37-16 also
require that new development water consumption be more efficient than in existing
communities. Outside the cities of Lancaster and Palmdale, the region is largely rural with
large lots or farm areas and isolated subdivisions that do not possess the centralized
services, conservation features, and planned landscaping or water recycling features
included in the Project. The region’s more urban areas generally were not constructed and

R:\Projects\PAS\CEN\000306\Draft EIR\5.18 Water Resources-051117.docx 5.18-49 Centennial Project
Draft EIR