Hawaii Administrative Rules
Title 11 - DEPARTMENT OF HEALTH
Subtitle 1 - GENERAL DEPARTMENTAL PROVISIONS
Chapter 21 - CROSS-CONNECTION AND BACKFLOW CONTROL
Section 11-21-7 - Irrigation systems
Universal Citation: HI Admin Rules 11-21-7
Current through February, 2024
(a) The following guidelines relating to backflow prevention devices for irrigation systems shall apply:
(1) Atmospheric vacuum breakers shall
be installed after the last control valve of each sprinkler circuit and at a
minimum of six inches above the highest irrigation head. The atmospheric vacuum
breaker shall be installed only on irrigation circuits with heads that will not
return any pressure in the circuit when the circuit control valve is
closed.
(2) Pressure vacuum
breakers shall be installed at the beginning of each irrigation circuit and at
a minimum of twelve inches above the highest irrigation head on the circuit.
Individual irrigation circuits having quick coupling valves or other similar
type heads that will permit pressure to be retained in the circuit shall have a
pressure vacuum breaker installed as a minimum requirement for each circuit.
Irrigation systems using the subsurface drip method shall have a pressure
vacuum breaker on each circuit. A pressure vacuum breaker may not be installed
where a double check valve assembly, reduced pressure principle backflow
prevention device, or air gap separation is required.
(3) A double check valve assembly may be
installed to serve multiple irrigation circuits in lieu of vacuum breakers on
each individual irrigation circuit.
(4) A reduced pressure principal backflow
preventor or air gap separation shall be required before any piping network in
which fertilizers, pesticides and other chemicals or toxic contaminants are
injected or siphoned into the irrigation system.
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