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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.

PESTICIDE
Water Use and Treatment Restrictions
Well*
<10 feet from shore
Well*
>10 feet from shore
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 7 to14 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. If weed density is high, 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
Fluridone Keep ¼ mile from potable water intake unless dosage rate used is <0.02 ppm of fluridone. Cannot exceed the maximum labeled dosage rate for a given treatment site per season. Do not retreat within 30 days. In aquatic sites > 10 acres in size, there is a minimum 5 acre treatment area. 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 or irrigation of row crops, turf or ornamentals for 7 to 30 days. 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
   
Well*
<50 feet from shore
Well*
>50 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
2,4-D Do not apply to aquatic sites where water is used for irrigation, ag spraying, livestock watering, or domestic purposes. Do not retreat within 30 days. Water use restrictions same as if a surface water intake. No restrictions
Endothall Do not use fish for feed or food within 3 days of treatment. For Aquathol & Aquathol Super K, do not use water for irrigation, ag 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. Do not retreat within 14 days. Water use restrictions same as if a surface water intake. No restrictions

 

 
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Last Updated: November 26, 2014