Spray Alerts

Ground & air spraying locations, dates, and times are listed below. Maps, if available, are also attached. In response to increased adult mosquito populations, or the detection of West Nile Virus, or the detection of invasive Aedes aegypti mosquitoes, the District is preparing to conduct adult and/or larval mosquito control operations in the following area(s):

Current Scheduled Spray Operations:

• Ground spraying for larval mosquito control using Altosid® SR-20 is scheduled for the morning of Monday, June 22, 2026, between 3:00 a.m. and 5:00 a.m.
  • Portion of North Ripon: >North to E. River Rd. and Cindy Dr., >South to SR 99, >East to Ripon Rd. >West to Fulton Ave. and Arc Way. See Map  

----------------------------------------------------------------------------------------------------------------------------------------------------

Past Completed Spray Operations:

• Ground spraying for larval mosquito control using Altosid® SR-20 is scheduled for the morning of Thursday, June 18, 2026, between 3:00 a.m. and 5:00 a.m.
  • Portion of North Ripon: >North to E. River Rd. and Cindy Dr., >South to SR 99, >East to Ripon Rd. >West to Fulton Ave. and Arc Way. See Map  CANCELLED DUE TO TECHNICAL ISSUE
     
• Ground spraying for adult mosquito control using DeltaGard® and/or Evergreen 5-25 is scheduled for the morning of Thursday, June 18, 2026, between 3:30 a.m. and 6:00 a.m.
  • Portion of Rural South County: South of Manteca to San Joaquin and Stanislaus Rivers and East to Austin Rd. See Map COMPLETE 
     
• Ground spraying for larval mosquito control using Altosid® concentrate (SR-20) is scheduled for the morning of Wednesday, June 17, 2026, between 3:00 a.m. and 5:00 a.m.
  • Southwest Stockton Area - Weston Ranch area: >North to Carolyn Weston Blvd.,  Carrie St., >South to William Moss Blvd., >East to Manthey Rd., >West to Carolyn Weston Blvd See Map  COMPLETE
     
• Aerial spraying for adult mosquito control using Dibrom®, is scheduled for the evening of Monday, June 15, 2026, between 8:30 p.m. and 10:30 p.m.
  • Portion of Rural South County: South of Manteca to San Joaquin and Stanislaus Rivers and East to Austin Rd. See Map COMPLETE
  • Portion of Bract Tract, Canal Ranch, and Terminous Tract : See Map COMPLETE
     
• Ground spraying for adult mosquito control using DeltaGard® and/or Evergreen 5-25 is scheduled for the morning of Wednesday, June 10, 2026, between 4:30 a.m. and 7:00 a.m.
  • West Terminous Tract: See Map COMPLETE
  • Portions of Staten Island and McCormack-Williamson Tract: See Map COMPLETE

• Ground spraying for adult mosquito control using DeltaGard® and/or Evergreen 5-25 is scheduled for the morning of Friday, May 22, 2026, between 5:15 a.m. and 7:00 a.m.
  • Portions of Thornton area: >North to Mokelumne River, >South to Beaver Slough, >East to Mokelumne River and Kile Rd., >West to I-5. See Map COMPLETE
  • West Terminous Tract : See Map COMPLETE
  • Portion of Staten Island: See Map  COMPLETE
     
• Ground spraying for adult mosquito control using DeltaGard® and/or Evergreen 5-25 is scheduled for the morning of Wednesday, May 13, 2026, between 5:30 a.m. and 7:00 a.m.
  • Portions of Thornton area: >North to Mokelumne River, >South to Beaver Slough, >East to Mokelumne River and Kile Rd., >West to I-5. See Map COMPLETE

West Nile Virus and
Dead Bird Hotline

(877) 968-BIRD (2473)

or online at westnile.ca.gov

Stay Informed!
Get Email Updates.

Sign up to receive email updates including news releases and spray updates.