Still the important advice is to read and follow directions on the label of any pest control product. These directions have been designed to assure safety and to assure the most effective results. These directions, among other instructions, are explicit about delaying application if it is a windy day, or if precipitation is expected within a certain amount of time, usually 24 hours. By following directions you can assure that pesticide applications will not get into water supplies. The fact is that the EPA must authorize the information on a pesticide label - and this includes the time recommended to keep children, adults and pets off of newly sprayed areas.
Parents can protect their children and pets by always reading and following label directions.
In the case of a commercial application, make sure the applicator leaves pertinent instructions with you. There are some municipalities which have required this action. Some lawn service companies do this regularly as a policy for consumers. My neighbor complains that my rose insect spray is drifting over and killing her lawn grass. However, this points up a needed alert.