Spray Alerts

Ground & air spraying locations, dates, and times are listed below. Maps, if available, are also attached. Please note that spray treatments are not available upon request and are conducted only when supported by data.  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

• Aerial spraying for adult mosquito control using Dibrom® is scheduled for the evening of Thursday, July 23, 2026, between 8:40 p.m. and 10:30 p.m. POSTPONED TO MONDAY, JULY 27, 2026 
  • Portions of Brack Tract, Canal Ranch, and Terminous Tract: See Map
  • Portion of Mandeville Island and Bacon Island: See Map
     
• Ground spraying for larval mosquito control using VectoBac WDG® is scheduled for the morning of Friday, July 24, 2026, between 3:15 a.m. and 5:30 a.m.
  • Portion of Southwest Stockton - Weston Ranch area: >North to Watercourse St., >South to French Camp Rd., >East to Pissarro Dr., >West to San Joaquin River See Map  COMPLETE
• Ground spraying for adult mosquito control using Evergreen 5-25 and/or DeltaGard® is scheduled for the morning of Friday, July 24, 2026, between 3:15 a.m. and 6:00 a.m.
  • Portion of Southwest Stockton - Weston Ranch area: >North to Decarli St., Lloyd Thayer Cir.,  Carrie St., >South to William Moss Blvd., >East to Manthey Rd., >West to Carolyn Weston Blvd See Map  COMPLETE
  • Portion of North Stockton: >North to Bear Creek, > South to Mosher Slough, > East to Union Pacific RxR, >West to Davis Rd. See Map  COMPLETE
  • Portion of North Stockton:  >North to Sutherland Dr., >South to Hammer Ln., >West to R&R tracks, East to West Ln. See Map COMPLETE
  • Portion of Rural South County: >North to Division Rd., >South to San Joaquin and Stanislaus Rivers, >East to Stanislaus River, >West to Two Rivers Rd See Map COMPLETE
  • Portion of North Escalon: >North to Mission Street, >South to California St., and Jackson Ave., >East to Campbell Ave., >West to  Escalon-Bellota Rd. See Map COMPLETE
  • Rural East Escalon: >North to OID Canal, >South to Hwy 120, >East to Victory Ave., >West to Henry Rd. See Map COMPLETE
  • Portion of West Tracy: >North to Tennis Lane and W. Schulte Rd., >South to Western Pacific R&R, >East to Coral Hollow Rd., >West to Faith Ln. and Mabel Josephine Dr. See Map COMPLETE

Past Completed Spray Operations:

• Ground spraying for larval mosquito control using VectoBac WDG® is scheduled for the morning of Thursday, July 23, 2026, between 3:00 a.m. and 5:00 a.m.
  • Portion of Southwest Stockton - Weston Ranch area: >North to Decarli St., Lloyd Thayer Cir.,  Carrie St., >South to William Moss Blvd., >East to Manthey Rd., >West to Carolyn Weston Blvd See Map  COMPLETE
     
• Ground spraying for adult mosquito control using Evergreen 5-25 and/or DeltaGard® is scheduled for the morning of Thursday, July 23, 2026, between 3:00 a.m. and 5:30 a.m.
  • Portion of Southwest Stockton - Weston Ranch area: >North to Watercourse St., >South to French Camp Rd., >East to Pissarro Dr., >West to San Joaquin River See Map  COMPLETE
  • Portion of Southwest Stockton - Weston Ranch area: >North to William Moss Blvd., >South to French Camp Rd., >East to Manthey Rd., Blake Cir., >West to Moraga Ln., Erickson Cir., Pisa Cir. See Map COMPLETE
  • Portion of South Tracy: >North to Valpico Rd., >South to W. Linne Rd., >East to S. MacArthur Dr., >West to S. Tracy Blvd. See Map COMPLETE
  • Portion of Southwest Tracy: >North to W. Schulte Rd, >South to Valpico, >East to Tracy Blvd., >West to Sycamore Pkwy See Map COMPLETE
  • Portion of Northwest Stockton: >N to Eight Mile Rd., >S to White Slough, > E to Trinity Parkway, >W to Rio Blanco Rd. See Map COMPLETE
     
• Aerial spraying for adult mosquito control using Dibrom® is scheduled for the evening of Sunday, July 19, 2026, between 8:45 p.m. and 10:30 p.m.
  • Portions of Shima Tract, Rindge Tract, Atlas Tract, Wright Tract: See Map  COMPLETE
  • Portions of Empire Tract and Terminous Tract: See Map  COMPLETE
  • Portion of Brack Tract: See Map  COMPLETE
     
• Ground spraying for larval mosquito control using VectoBac WDG® is scheduled for the morning of Friday, July 17, 2026, between 3:30 a.m. and 5:30 a.m.
  • Portion of South Manteca: >North to E. Woodward Ave., >South to Tannehill Dr., >East to Pillsbury Rd., >West to S. Main St. See Map  COMPLETE
     
• Ground spraying for adult mosquito control using Evergreen 5-25 and/or DeltaGard® is scheduled for the morning of Friday, July 17, 2026, between 3:30 a.m. and 5:30 a.m.
  • Portion of South Manteca: >North to Wawona St., >South to Hwy 120, >East to Union Rd., >West to Airport Way. See Map  COMPLETE
  • Portion of South Lodi: >North to W. Century Blvd., >South to W. Harney Ln., >East to S. Hutchins St., >West to S. Mills Ave. See Map  COMPLETE
  • Portion of North Stockton: >North to Hammer Ln., >South to Hazelwood Ave., Bonniebrook Dr., and W. Lincoln Rd., >East to Pershing Ave., >West to Westland Ave. See Map  COMPLETE
  • Portion of North Stockton: >North to Mosher Slough, >South to E. Hammer Ln., >East to RxR tracks., >West to Tam O Shanter Dr. See Map  COMPLETE
  • Portion of Rural South County: > North to one mile north of E. McMullin Rd. > South to Perrin Rd., > East to Airport Way, > West to S. Hays Rd.  See Map COMPLETE
     
• Ground spraying for larval mosquito control using VectoBac WDG® is scheduled for the morning of Thursday, July 16, 2026, between 3:30 a.m. and 5:30 a.m.
  • Portion of South Manteca: >North to Wawona St., >South to Hwy 120, >East to Union Rd., >West to Airport Way. See Map COMPLETE
     
• Ground spraying for adult mosquito control using Evergreen 5-25 and/or DeltaGard® is scheduled for the morning of Thursday, July 16, 2026, between 3:30 a.m. and 5:30 a.m.
  • Portion of East Manteca: >North to Southland Rd., >South to E. Yosemite Ave., >East to S. Austin Rd., >West to Cottage Ave. and Hwy. 99 See Map COMPLETE
  • Portion of South Manteca: >North to E. Woodward Ave., >South to Tannehill Dr., >East to Pillsbury Rd., >West to S. Main St. See Map COMPLETE
     
• Aerial spraying for adult mosquito control using Evergreen 5-25® ULV Air is scheduled for the evening of Sunday, July 12, 2026, between 8:45 p.m. and 10:00 p.m.
  • Portions of Shima Tract, Rindge Tract, Wright Tract : See Map COMPLETE
     
• Aerial spraying for adult mosquito control using Evergreen 5-25® ULV Air is scheduled for the evening of Thursday, July 9, 2026, between 8:45 p.m. and 10:30 p.m.
  • Portions of McDonald Island, Lower Jones Tract, and Roberts Island: See Map COMPLETE
  • Portion of Rural West Lodi: >North to Hwy 12, >South to White Sough, >East to 1/2 mile west of I5, >West to 2 & 1/3 miles west of I-5 See Map COMPLETE
     
• Ground spraying for larval mosquito control using Altosid® concentrate (SR-20) is scheduled for the morning of Friday, July 10, 2026, between 3:15 a.m. and 5:00 a.m.
  • Portion of Northwest Stockton: >North to Eight Mile Rd., >South to White Slough, >East to Davis Rd., >West to Thornton Rd. See Map COMPLETE
     
• Ground spraying for adult mosquito control using Evergreen 5-25 and/or DeltaGard® is scheduled for the morning of Friday, July 10, 2026, between 3:15 a.m. and 5:00 a.m.
  • Portion of Stockton - Morada: >North to E Ashley Ln., >South to E. Fopiano Ln., >East to RxR and Alhambra Ave., >West to 99 See Map COMPLETE
  • Oak Grove Regional Park: (rescheduled from Thursday, July 9, 2026)  See Map COMPLETE
     
• Ground spraying for larval mosquito control using VectoBac WDG® is scheduled for the morning of Thursday, July 9, 2026, between 3:15 a.m. and 5:00 a.m.
  • Portion of Northwest Stockton: >North to Eight Mile Rd., >South to White Slough, >East to Thornton Rd., >West to I-5. See Map  COMPLETE
     
• Ground spraying for adult mosquito control using Evergreen 5-25 and/or DeltaGard® is scheduled for the morning of Thursday, July 9, 2026, between 3:15 a.m. and 5:00 a.m.
  • Portion of South Manteca: >North to E. Woodward Ave., >South to Tannehill Dr., >East to Pillsbury Rd., >West to S. Main St. See Map  COMPLETE
  • Portion of South Manteca: >North to Wawona St., >South to Hwy 120, >East to Union Rd., >West to Airport Way See Map COMPLETE
  • Oak Grove Regional Park: See Map POSTPONED TO FRIDAY, JULY 10, 2026
  • Portion of Southeast Tracy: >North to Tulare Dr. and Tulloch Dr., >South to Valpico Rd., >East to Basque Dr., >West to S MacArthur Dr. See Map COMPLETE
  • Portion of Southeast Tracy: >North to Biarritz St., >South to Valpico Rd., >East to S. Chrisman Rd., >West to Elissagaray Dr. and Mt. Pellier St. See Map COMPLETE
     
• Ground spraying for larval mosquito control using VectoBac WDG® is scheduled for the morning of Wednesday, July 8, 2026, between 3:30 a.m. and 5:30 a.m.
  • Linden: >North to Monte Vista Dr., >South to Hwy 26, >West to Archerdale Rd., >East to Cox Rd.. See Map  COMPLETE
     
• Ground spraying for adult mosquito control using Evergreen 5-25 and/or DeltaGard® is scheduled for the morning of Wednesday, July 8, 2026, between 3:30 a.m. and 5:30 a.m.
  • Portion of South Stockton: >North to Dr. Martin Luther King Blvd., >South to E. 9th Street, >East to U.P. RR tracks, >West to S. El Dorado St. See Map  COMPLETE
  • Portion of South Manteca: >North to E. Woodward Ave., >South to Tannehill Dr., >East to Pillsbury Rd., >West to S. Main St. See Map  CANCELLED DUE TO TECHNICAL ISSUE - WILL BE RESCHEDULED
     
• Ground spraying for larval mosquito control using VectoBac WDG® is scheduled for the morning of Thursday, July 2 2026, between 3:30 a.m. and 5:30 a.m.
  • Portion of Southeast Tracy: >North to Tulare Dr. and Tulloch Dr., >South to Valpico Rd., >East to Basque Dr., >West to S MacArthur Dr. See Map  COMPLETE
• Ground spraying for adult mosquito control using DeltaGard® and/or Evergreen 5-25 is scheduled for the morning of Thursday, July 2 2026, between 3:30 a.m. and 5:30 a.m.
  • Southwest Stockton Area- Weston Ranch area: >North to Decarli St., Lloyd Thayer Cir.,  Carrie St., >South to William Moss Blvd., >East to Manthey Rd., >West to Carolyn Weston Blvd See Map  COMPLETE
  • Portion of North Stockton: >North to Mosher Slough, >South to E. Hammer Ln., >East to LeMans Ave., >West to Tam O Shanter Dr. See Map  COMPLETE
  • Stockton - Portion of Brookside: >North to Riverbrook Dr., >South to Brookview Dr. and Shadowbrook Dr., >East to Brookside Rd., >West to Riverbrook Dr. See Map  COMPLETE
  • Portion of North Stockton: >North to Hammer Ln., >South to Benjamin Holt Dr., >East to Pershing Ave., >West to Alexandria Place. See Map  COMPLETE
  • Rural East Escalon: >North to Dutra Ln., >South to Hwy 120, >East to Victory Ave., >West to Henry Rd. See Map  COMPLETE
  • Portion of Rural South County:  > North to one mile north of E. McMullin Rd., > South to Perrin Rd., > East to Airport Way, > West to S. Hays Rd. See Map COMPLETE
  • North Manteca: >North to Northgate Dr., >South to W. Louise Ave. and Joseph Rd. >East to N. Union Rd., >West to N. Main St. & Tidewater Trail   See Map COMPLETE
  • Rural West Lodi: >North to Hwy 12, >South to White Sough, >East to 1/2 mile west of I5, >West to 2 & 1/3 miles west of I-5. See Map COMPLETE
     
• Aerial spraying for adult mosquito control using Evergreen 5-25® ULV Air is scheduled for the evening of Monday, June 29, 2026 OR Tuesday, June 30, 2026 (depending on weather) between 8:45 p.m. and 10:30 p.m.
  • Portions of Shima Tract, Rindge Tract, and Wright Tract: See Map COMPLETE
  • Portion of Bract Tract, Canal Ranch, and Terminous Tract : See Map COMPLETE
     
• Ground spraying for larval mosquito control using Altosid® concentrate (SR-20) is scheduled for the morning of Friday, June 26, 2026, between 3:15 a.m. and 5:00 a.m.
  • Southwest Stockton Area: >North to Decarli St., Lloyd Thayer Cir.,  Carrie St., >South to William Moss Blvd., >East to Manthey Rd., >West to Carolyn Weston Blvd See Map COMPLETE
     
• Ground spraying for adult mosquito control using DeltaGard® and/or Evergreen 5-25 is scheduled for the morning of Friday, June 26, 2026, between 3:15 a.m. and 6:00 a.m.
  • Southwest Stockton Area- Weston Ranch area: West block: >North to Watercourse St., >South to French Camp Rd., >East to Pissarro Dr., >West to San Joaquin River See Map COMPLETE
  • Southwest Stockton Area- Weston Ranch area: East block: >North to William Moss Blvd., >South to French Camp Rd., >East to Manthey Rd., Blake Cir., >West to Moraga Ln., Erickson Cir., Pisa Cir. See Map COMPLETE
  • North Stockton:  > North to Meadow Ave., > South to W. Lincoln Rd., > East to Pershing Ave., > West to Alexandria Place See Map COMPLETE
  • Portion of Northwest Stockton: >North to Otto Dr., >South to White Slough, >East to Thornton Rd., >West to I-5 See Map COMPLETE
  • Portion of North Stockton- Quail Lakes area: >North to Quail Lakes Drive, >South to March Ln., >East to N. Pershing Ave., >West to Quail Lakes Dr. See Map COMPLETE
  • Portions of Terminous Tract and Bouldin Island: See Map COMPLETE
  • Portion of South Manteca: >North to E. Woodward Ave., >South to Tannehill Dr., >East to Pillsbury Rd., >West to S. Main St. See Map COMPLETE
  • Portion of West Manteca: >North to E Lathrop Rd., >South along the RXR tracks, >East to London Ave., >West to S. Airport Way See Map COMPLETE
  • Portion of Rural South County: > North to one mile north of E. McMullin Rd., > South to Perrin Rd., > East to Airport Way, > West to S. Hays Rd. See Map COMPLETE
  • Rural East Escalon: >North to Dutra Ln., >South to Hwy 120, >East to Victory Ave., >West to Henry Rd. See Map COMPLETE
     
• Aerial spraying for adult mosquito control using Dibrom®, is scheduled for the evening of Wednesday, June 24, 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
  • Portions of Shima Tract, Rindge Tract, Wright Tract, Lower Roberts Island: See Map  COMPLETE
     
• 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  COMPLETE
     
• 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.