News Flash

2021 Press Releases

Posted on: August 20, 2021

Mosquito Spraying for West Nile Virus Planned for Norristown Municipality on August 24

Norristown Mosquito Spray Area for 8.24.21

NORRISTOWN, PA – The Montgomery County Department of Health and Human Services, Office of Public Health (OPH), after consulting with the Pennsylvania Department of Environmental Protection (PADEP) and Norristown Municipality officials, will be adulticiding (spraying) to control the adult mosquito population in selected areas. The spraying will be done where sampling by the OPH and PADP has shown mosquitoes that carry the West Nile Virus (WNV). For notification of any future spray events, sign up with the County's emergency notification system, ReadyMontco.

The spray events will occur, weather permitting on Tuesday, August 24, 2021, from approximately 8:30 p.m. to 10:30 p.m. The alternate date will be Thursday, August 26, 2021. All areas within the highlighted section of the map shown will be subjected to the spray. Residents within the spray area should consider remaining indoors, closing windows and turning off ventilation systems that draw in outside air for the duration of the spray plus 30 minutes afterward.

Workers will be using a Duet® Dual-Action Adulticide at a rate of .75 fluid ounces per acre applied with a truck mounted ultra low volume (ULV) sprayer. The spray will be performed by OPH personnel.

The OPH will work with appropriate agencies to identify, eliminate and/or treat with larvicide, areas where mosquitoes are breeding. Residents may contact the OPH at 610.278.5117, if there is an area of standing water of concern that may be breeding mosquitoes. The adult mosquito program will only be used in limited situations to reduce disease-infected adult mosquitoes.

For further information about the products being used, visit the OPH website.

Residents can follow these tips to help eliminate mosquito-breeding areas around the home:

  • Identify and eliminate all sources of standing water. Mosquitoes will breed in any stagnant water that stands for five or more days.
  • Dispose of tin cans, plastic containers, ceramic posts or similar water holding containers. Don't overlook container that have become overgrown by aquatic vegetation.
  • Pay special attention to discarded tires that may have collected water. They can serve as a breeding ground for mosquitoes.
  • Drill holes in the bottom of recycling container that are left outdoors. Drainage holes that are located on the container sides collect enough water for mosquitoes to breed in.
  • Have clogged roof gutters cleaned on an annual basis, particularly if the leaves from surrounding trees have a tendency to block drains.
  • Turn over plastic wading pols when not in use. A wading pool becomes a place for mosquitoes to breed if it is not used on a regular basis.
  • Turn over wheelbarrows and do not allow water to stagnate in birdbaths.
  • Aerate ornamental pools or stock them with fish. Water gardens are fashionable but become major mosquito breeding grounds if they are allowed to stagnate.
  • Keep swimming pools clean and chlorinated. A swimming pool that is left untended becomes a source of mosquito breeding. Be aware that mosquitoes may even breed in the water that collects on swimming pool covers.

Media Contact: Kelly Cofrancisco,


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