Weather and conditions permitting, the Williams County Vector Control District, or WCVCD, will conduct ground adulticide treatments near sunset using truck-mounted Ultra Low Volume, or ULV, fogging equipment. Get our free mobile appWilliams County Vector ControlWhere Will Fogging Take Place? Residents in those areas may see Vector Control trucks moving through neighborhoods and other areas as crews conduct the treatment. Residents are reminded to stay at least 300 feet away from Vector Control trucks while fogging operations are taking place. For those who want to see exactly where treatment is planned, a spray block map is available through the Williams County Vector Control District.