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Washington Administrative Code (Last Updated: November 23, 2016) |
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Title 16. Agriculture, Department of (See Titles 24, 60, and 142) |
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Chapter 16-232. Use restricted herbicides in certain counties. |
Section 16-232-440. What are the restrictions on the use of pesticides containing chlorpyrifos or diazinon near source water?
Latest version.
- (1) All source water used for chemigation including, but not limited to, open reservoirs, ponds, or sumps must be protected from contact with chlorpyrifos or diazinon during an application unless the source water is demonstrated to have no hydraulic connection with drainage ditches or culverts.(2) For the purpose of subsection (1) of this section, "hydraulic connection" means, water can flow between one source (either ground or surface water) to another source (either ground or surface water). Connection can be natural or manmade.(3) For the purpose of subsection (1) of this section, "protected" means:(a) Placement of a barrier or covering system over the source water in a manner that ensures spray from the nozzles do not contact the source water; or(b) Design, placement, operation, and maintenance of irrigation sprayheads or nozzles in a manner that ensures spray from the nozzles does not contact the source water.(4) Hydraulic connections will be determined as needed, by the department upon review of the source water system design.