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Government

Housing and Construction Standards

High-Efficiency Toilets and Urinals

High-efficiency Toilets

Proposed Code Changes

10.3.1.2. Fixture Efficiency

1) Except as required in Sentence (2), the flush cycle for the installation of a water closet or urinal must not exceed the flush cycle listed for that fixture in Table 10.3.1.2. (1)

Table 10.3.1.2. (1)
Maximum Flush Cycle
Forming Part of Sentence 10.3.1.2. (1)
Fixture L
Water Closet (Tank Type That Provides Dual Flush Cycle Option) 4.1 and 6.0
Water Closet (Direct Flush) 6.0
Urinal (Tank Type) 1.9
Urinal (Direct Flush) 1.9

2) The flush cycle for the installation of a water closet or urinal in buildings classified as Group C must not exceed the flush cycle listed for that fixture in Table 10.3.1.2. (2).

Table 10.3.1.2. (2)
Maximum Flush Cycle
Forming Part of Sentence 10.3.1.2. (2)
Fixture L
Water Closet (Tank Type) 4.8(1)
Water Closet (Direct Flush) 4.8
Urinal (Tank Type) 1.9
Urinal (Direct Flush) 1.9

Notes to Table 10.3.1.2. (2)

(1) A water closet which provides a dual flush cycle option of both 4.1 or less L and 6.0 L shall be deemed to comply