limate analysis to determine the availability of on-site resources and choose strategies that are appropriate and cost- effective. Table 1. UPC and IPC Standards for Plumbing Fixture Water Use Ildwe UPC and IPC Standards EPA WaterSense Standards Water closets (gallons per flush. gp0 1.60 1.28 Urinals (gpf) 1.00 0.5, Showerheads (ga