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Mosquito Control
The Streets Division is responsible for the mosquito spraying throughout the City of Portland. During mosquito season, the city receives spraying on as needed basis according to the number of complaints received and/or as per mosquito count by city personnel.

The City is separated into areas for mosquito spraying.  Spraying is scheduled to be conducted on the following schedule, although factors such as wind and rain will affect the schedule. Morning spraying typically starts at 4:00 a.m. and evening spraying typically starts at 8:00 p.m.     




Ongoing - - The City began spraying on Aug. 31 and will continue to spray as long as conditions permit. We’re also doing some daytime spraying in areas
where it is safe to do so.  Crews are also treating ditches with larvicide to keep the mosquito population down as much as we can.

Updated September 5, 2017


Currently, the City of Portland utilizes two adulticides--Mosquitomist ONE ULV (the Safety Data Sheet is located here) and Biomist 4+4 ULV (the Safety Data Sheet is located here).

In addition to mosquito spraying, the city treats drainage ditches and the storm sewer system (areas of standing water) with Environmental Protection Agency-approved Altosid or Natular briquets. This is the most effective approach in reducing the mosquito population by killing the mosquito larvae before it has the opportunity to become an adult.

Mosquito Control Tips
Tips for mosquito control include the following:
  • Avoid outside activity at dusk and dawn during mosquito season (May to October).
  • Wear protective clothing.
  • Make sure that door and window screens fit tightly.
  • Drain all standing water.
  • Clean clogged roof gutters.
  • Keep grass trimmed.

Additional Resources
To learn more about West Nile virus, please visit the Texas Department of State Health Services and the 
The Centers for Disease Control and Prevention (CDC) .

To learn more about the Zika virus, please visit the Texas Department of State Health Services

To report mosquitoes in your neighborhood, call (361) 777-4601.