Using UPC water supply fixture unit (WSFU) values from Table 610.3, what is the total WSFU load of 2 lavatories (private) and 1 water closet (flush tank, private)?
Not quite. The answer is C: 4.5
Each private lavatory contributes 1.0 WSFU and the 1.6 gpf tank-type water closet contributes 2.5 WSFU in Table 610.3. Two lavatories plus one water closet is 1.0 + 1.0 + 2.5 = 4.5. The table lists one total value per fixture; a separate hot or cold share is only taken later, using the three-quarters allowance in the table's notes.
Reference: UPC 2021 Table 610.3 (Water Supply Fixture Units)
Checked against multiple published sources
The Seattle copy marks this table's heading as a city amendment, and WAC 51-56-0600 does not amend it, so we treat the values as the base 2021 UPC figures. The exam supplies this table at the desk.
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