How long after herbicide treatment before I use lake water for watering vegetables & flowers? Will vegetables be safe to eat?

Restrictions for plant watering using lake water in treatment areas vary depending on the herbicide used but are applicable to shoreline property owners within 200’ of the treated areas.  For diquat the water use restriction can be up to 5 days and for fluridone up to 30.  The actual time will be recommended by the NH Dept Agriculture permit which may also require testing by the vendor of water in the treated areas.  None of the herbicides on our list bioaccumulate in animals or plants.