ATCP 29.54(1)(a)(a) “Agricultural chemigation system” means a chemigation system that mixes pesticides with irrigated water and applies the pesticides with the irrigation water in an agricultural setting.

ATCP 29.54(1)(am)(am) “Automatic low pressure drain valve” means a self-activating device which is designed and constructed to drain the water supply pipeline in a chemigation system if water pressure falls or the water supply pump ceases operation.

ATCP 29.54(1)(b)(b) “Calibrate” means to measure and adjust the dispersal or output of equipment to control the rate of pesticide dispersal, and the droplet or particle size of pesticides dispersed by that equipment.

ATCP 29.54(1)(c)(c) “Check valve” means a device designed and constructed to close a water supply pipeline, pesticide injection line, or other conduit in a chemigation system and to prevent reverse flow in that line.

ATCP 29.54(1)(e)(e) “Chemigation system” means a device or system which mixes pesticides with irrigation water drawn from any source, and which applies the pesticides with the irrigation water. “Chemigation system” includes all of the components of the system. “Chemigation system” does not include any of the following:

ATCP 29.54(1)(e)4.4. A device or system used only to apply pesticides directly to the roots of ornamental trees and shrubs.

ATCP 29.54(1)(f)(f) “Flush time” means the time needed under normal operating conditions to completely fill an irrigation system with water so that all outlets are discharging water.

ATCP 29.54(1)(g)(g) “Injection unit” means a chemical metering pump or device that withdraws pesticide from a supply tank and injects the pesticide into irrigation water during chemigation.

ATCP 29.54(1)(gm)(gm) “Non-agricultural chemigation system” means a chemigation system that is used to apply pesticides in a non-agricultural setting, including to urban lawns and gardens.

ATCP 29.54(1)(h)(h) “Pesticide supply tank” means a container used to hold pesticides for injection into a chemigation system.

ATCP 29.54(1)(j)(j) “Potable water supply” means a well or other source of water which is used for human consumption, hygiene, or preparation of food products.

ATCP 29.54(1)(k)(k) “Reduced pressure principle backflow preventer” means a backflow prevention device consisting of 2 independently acting check valves, spring-loaded to a closed position and separated by an intermediate chamber in which there is an automatic relief that is vented to the atmosphere and spring-loaded to the open position.

ATCP 29.54(1)(km)(km) “Urban pesticide misting system” means a non-agricultural chemigation system that draws water from any source, mixes the water with a pesticide, and applies the mixture outdoors and into the air to kill, repel, or otherwise control pests in an urban setting, including a residential or commercial area.

ATCP 29.54(1)(L)(L) “Vacuum relief valve” means an atmospheric device designed, constructed, and installed to protect against back-siphonage by allowing the entry of air to relieve vacuums in a chemigation system.

ATCP 29.54(2)(2) General requirements.

ATCP 29.54(2)(b)(b) Except as provided under sub. (18), a chemigation system shall be designed and constructed according to this section.

ATCP 29.54(2)(c)(c) A chemigation system shall be designed, constructed, operated, and maintained to do all of the following:

ATCP 29.54(3)(3) Chemigation water supply. No chemigation system may draw water directly from a potable water supply. A chemigation system may draw water from a pond or reservoir to which water has been pumped from a potable water supply, provided that there is an unobstructed vertical air gap between the potable water supply outlet and the flood level of the pond or reservoir. The air gap shall be at least 2 feet, or at least twice the diameter of the effective opening of the water supply outlet, whichever is greater.