NJDEP-Compliance and Enforcement - Aquatic Pesticide Guidelines

Aquatic Pesticide Guidelines

Many of the pesticides used in aquatic weed control programs have restrictions on the use of the treated water for potable purposes and/or other uses such as swimming, irrigation, crop spraying or stock watering. The use of the treated water is dictated by the product label. However, labels are often subject to interpretation and the question often arises as to what exactly is "treated water". For example, the water use restrictions may not apply to an entire 500 acre lake when only a 10 acre portion is being treated.

The following chart is the New Jersey Pesticide Control Program's interpretations of the various water use restrictions found on the aquatic pesticide labels.These guidelines are to be used as a supplement to the pesticide label.These guidelines do not supersede imposed Aquatic Pesticide Permit conditions or the pesticide label directions. Nor do they release the applicator from the responsibility of making sure that all users of the treated water are aware of the water use restrictions.

This guidance chart below of aquatic pesticide active ingredients does not supersede any registered aquatic pesticide product label directions unless the guidance statement is more restrictive.

PESTICIDE	Water Use and Treatment Restrictions	Well* <10 feet from shore	Well* >10 feet from shore
Aquashade	Outflow from aquatic site must be little to none. Do not apply to flowing water. Aquatic site must be under the total control of the user. Do not use in aquatic sites where water is used for potable water.	Water use restrictions same as if a surface water intake.	No restrictions
Bispyribac-sodium	Do not retreat within 14 days. Do not use treated water to irrigate food or ornamental crops until the concentration of in water is less than or equal to 1 ppb. Treated water may not be used as a water source for livestock until the concentration in water is less than or equal to1 ppb.	Water use restrictions same as if a surface water intake.	No restrictions
Calcium Hypochlorite	Do not apply to any aquatic site not under the total control of the user. This means that all surface water discharge from the pond can be stopped, by some mechanism, if necessary. No fishing with only limited boating in aquatic site.	Water use restrictions same as if a surface water intake.	No restrictions
Carfentrazone-ethyl	Only treat 1/3 to 1/2 of the aquatic site at one time and do not retreat within 14 days. Do not apply directly to water within ¼ mile of an active potable water intake. To make aquatic applications around and within ¼ mile of active potable water intakes, the water must be turned off prior to and for a minimum period of 24 hours after the application. Do not use treated water for irrigation in commercial nurseries or greenhouses. The water use restrictions, depending on dosage rate used, are, 14 days for irrigation of food crops, ornamentals, and turf.	Water use restrictions same as if a surface water intake.	No restrictions
Copper/ Copper Sulfate	Treated water must not exceed 1 ppm metallic copper residual if used for potable water. Depending on specific product used, may treat only 1/3 to 1/2 of the aquatic site at one time and do not retreat within 14 days.	Water use restrictions same as if a surface water intake.	No restrictions
Diquat	Do not apply to flowing water. Do not apply to any aquatic site not under the total control of the user. Outflow must be little to none or do not treat within 1,000 feet of that outlet. The water use restrictions, depending on dosage rate used, are 1 to 3 days for drinking, 1 day for livestock watering, 5 days for irrigation or spraying of food crops, and 1 to 3 days for irrigation or spraying of ornamentals or turf. The water may be used prior to the above time limits if the concentration of diquat dibromide (calculated as the cation) in the treated water is < 0.02 ppm. If the treatment area is more than 1000 feet from the water use area or intake, the water use restrictions may be waived. Only treat 1/3 to ½ of aquatic site at one time. Do not retreat within 14 days.	Water use restrictions same as if a surface water intake.	No restrictions
Endothall	The drinking water setback distance from functioning potable water intakes in the treated water body must be greater than or equal to 600 feet. Do not use fish for feed or food within 3 days of treatment. Do not retreat within 14 days. For Aquathol K & Aquathol Super K, do not use water for irrigation, agricultural sprays, or domestic purposes for 7 days after treatment. For Aquathol K & Hydrothol, do not use water for irrigation, ag sprays, livestock watering or domestic purposes for 7 to 25 days after treatment, depending on the dosage rate used. If the treatment area is more than 1000 feet from the water use area or intake, the water use restrictions may be waived. For Aqua Strike, the water use restrictions, depending on dosage rate used, is 1 to 3 days for drinking, 1 day for livestock watering, 5 days for irrigation or spraying of food crops, and 1 to 3 days for irrigation or spraying of ornamentals or turf.	Water use restrictions same as if a surface water intake.	No restrictions
Florpyrauxifen-benzyl	Do not retreat within 14 days. Turf may be irrigated immediately after treatment. The water use restrictions, depending on dosage rate used, is 3 to 35 days for landscape vegetation and other forms of non-agricultural irrigation.	Water use restrictions same as if a surface water intake	No restrictions
Flumioxazin	Do not retreat within 28 days. For Schooner 51% WDG and Semera 51% WDG, the water use restrictions, depending on dosage rate used, are 3-12 days for irrigation of ornamentals and turf and 5 days for irrigation of food crops, ornamentals grown for production in greenhouse and nursery. For Depth Charge, do not apply directly to water within 600 ft of a potable water intake. * (Refer to 2,4-D restrictions listed in the chart below).	Water use restrictions same as if a surface water intake.	No restrictions
Fluridone	Keep ¼ mile from potable water intake unless dosage rate used is <0.02 ppm. Do not exceed the maximum labeled dosage rate for a given treatment site per season. Do not retreat within 7 days. Depending on the type of aquatic site treated and the formulation used, the water use restrictions are as follows: no irrigation of established trees for 7 days, 14 to 30 days for irrigation of row crops, turf, or ornamentals (Specified on product label)	Water use restrictions same as if a surface water intake.	No restrictions
Glyphosate	Keep ½ mile from potable water intake unless water intake can be shut off for at least 48 hours. The water intake can be used again prior to 48 hours only if the concentration of glyphosate in the treated water is <0.7 ppm. Do not retreat within 14 days.	Water use restrictions same as if a surface water intake.	No restrictions
2,4-D	Do not apply to aquatic sites where water is used for irrigation, agriculture spraying, livestock watering, or domestic purposes. Do not retreat within 21 days. Do not swim in treated water for a minimum of 24 hours after application. Do not exceed 70 ppb for potable water consumption	Water use restrictions same as if a surface water intake.	No restrictions
Hydrogen Peroxide	Only treat 1/3 to ½ of aquatic site at one time. Do not retreat within 4 days. Do not apply directly to potable water intended for human consumption.	Water use restrictions same as if a surface water intake.	No restrictions
Imazapyr	Only treat 1/3 to ½ of aquatic site at one time. Do not retreat within 10 days. Do not use treated water to irrigate greenhouses, nurseries or hydroponics etc. until concentration is less than or equal to 1ppb. For Arsenal, Habitat, and Nufarm Polaris, do not apply directly to water within ½ mile of an active potable water intake. To make applications within ½ mile of active potable water intakes, the water intake must be turned off during application and for 48 hours after the application. For Clearcast, applications made within ¼ mile of an active potable water source cannot exceed 500 ppb, but water concentrations resulting from injection and/or foliar applications may not exceed 50ppb.	Water use restrictions same as if a surface water intake.	No restrictions
Penoxsulam	Do not retreat within 7 days. Do not use treated water for irrigating greenhouse or nursery plants. There is no restriction on use of treated water for turf irrigation if concentrations are less than 30ppb. Other restrictions are dependent on concentration and targeted use. Refer to product label.	Water use restrictions same as if a surface water intake.	No restrictions
Sodium Carbonate	Only treat 1/3 to ½ of aquatic site at one time. Do not retreat within 4 days.	Water use restrictions same as if a surface water intake.	No restrictions
Sodium Hypochrorite	Do not apply to any aquatic site not under the total control of the user. This means that all surface water discharge from the pond can be stopped, by some mechanism, if necessary. No fishing with only limited boating in aquatic site.	Water use restrictions same as if a surface water intake.	No restrictions
Triclopyr	Treated water may not be used for irrigation purposes for 120 days or residue levels are less than or equal to 1 ppb. The setback distance for applications to potable water intake, depending on dosage rate used and concentration are within 200ft. to 2600ft.	Water use restrictions same as if a surface water intake.	No restrictions