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 Operation:

• Aerial spraying for adult mosquito control using Dibrom®, is scheduled for the evening of Monday, October 20, 2025, between 6:30 p.m. and 8:00 p.m.
  • Delta Area- Medford Island: See Map 
  • Delta area- Portions of Empire Tract and Terminous Tract: See Map

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Past Completed Spray Operations:

• Aerial spraying for adult mosquito control using Dibrom®, is scheduled for the evening of Sunday, October 12, 2025, between 7:00 p.m. and 9:00 p.m.
  • Portions of Brack 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 Friday, October 10, 2025, between 3:30 a.m. and 5:30 a.m.
  • Portion of Northwest Stockton: >North to Eight Mile Rd. >South to White Slough >East to Davis Rd. > West to I5 See Map COMPLETE
  • Portion of Northeast Stockton: >North to March Lane > South to the Calaveras River, > East to the Calaveras River, >West to West Lane. See Map COMPLETE
• Aerial spraying for adult mosquito control using Dibrom®, is scheduled for the evening of Wednesday, October 8, 2025, between 7:00 p.m. and 8:30 p.m.
  • Portion of Rural West Ripon: See Map COMPLETE
• Ground spraying for adult mosquito control using  DeltaGard® and/or Evergreen 5-25 is scheduled for the morning of Thursday, October 9, 2025, between 3:30 a.m. and 6:00 a.m.
  • Portion of West Escalon: >North to Yosemite Ave., >South to 1st Street, >East to McHenry Ave. & Hwy120, >West to Brennan Rd. See Map COMPLETE
  • Rural East Ripon: >North to .6 mile south of Greenleaf Rd., >South to Stanislaus River, >East to Sexton Rd., >West to Wagner Rd. See Map COMPLETE
  • Ripon Sewer: >North to Doak Rd., >South to Stanislaus County Line, >East to Stockton Ave., >West to Robert Ave. See Map COMPLETE
  • Portion of Rural South County: See Map COMPLETE
  • Portion of South Manteca: North to Woodward Ave > South to Sawtooth Rd > East to Pillsbury Rd > West to Main Street. See Map COMPLETE
• Aerial spraying for adult mosquito control using Dibrom®, is scheduled for the evening of Thursday, October 2, 2025, between 7:00 p.m. and 10:00 p.m.
  • Delta Area- Portion of Bacon Island  See Map COMPLETE
  • Delta Area- Portion of Brack Tract  See Map COMPLETE
  • Portion of Rural South County  See Map COMPLETE
• Ground spraying for adult mosquito control using  DeltaGard® and/or Evergreen 5-25 is scheduled for the morning of Friday, October 3, 2025, between 3:30 a.m. and 5:30 a.m.
  • Portion of West Escalon: >North to Yosemite Ave., >South to Valdapena Wy, Thompson Way, Zinfandel Dr. and Daniels Ave., >East to McHenry Ave., >West to Brennan 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 North Escalon: >North to Mahon Rd., >South to Hwy 120 & California St., > East to Campbell Ave., >West to Escalon-Bellota Rd. 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
  • Portion of West Stockton: >North to Calaveras River, >South to Michigan Ave., >East to I-5, >West to Rainer Ave. See Map  COMPLETE
  • Southwest Stockton, 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
  • Portion of North Stockton: >North to Whistler Way, >South to Wagner Heights Rd., >East to Davis Rd., >West to Thornton Rd. See Map COMPLETE
  • Portion of South of Manteca: >North to E. Woodward Ave., >South to Tannehill Dr., >East to Pillsbury Rd., >West to S. Main St. See Map ADDED 10/2/25* COMPLETE
• Aerial spraying for adult mosquito control using Dibrom®, is scheduled for the evening of Thursday, September 25, 2025, between 7:30 p.m. and 9:30 p.m.
  • Delta area- Portions of Empire Tract and Terminous Tract  See Map COMPLETE
  • Delta Area- Portion of Brack Tract See Map COMPLETE

• Ground spraying for adult mosquito control using  DeltaGard® and/or Evergreen 5-25 is scheduled for the morning of Friday, September 26, 2025, between 3:30 a.m. and 5:30 a.m.
  • Portion of Rural Northeast Tracy: >North to Old River, >South to Canal Blvd., >East to Tom Paine Rd., >West to Tom Paine Slough See Map COMPLETE
  • West Escalon: >North to Yosemite Ave., >South to Valdapena Wy, Thompson Way, Zinfandel Dr. and Daniels Ave., >East to McHenry Ave., >West to Brennan Rd. See Map COMPLETE
  • Rural North Escalon: >North1/2 mile north of Skiff Rd., >South to 1/2 mile south of Skiff Rd., >East to Escalon Bellota Rd., >West to Biederman Way See Map COMPLETE
  • Rural North Escalon: > North to one mile north of Lone Tree Rd., > South to one mile south of Lone Tree Rd., >East to Campbell Rd., >West to Brennan Rd. See Map COMPLETE
  • Portion of Northwest Stockton: >North to Stanfield Dr., >South Mosher Slough and Paloma Ave., >East to Thornton Rd., >West to Bainbridge Pl. &  Don Ave. See Map COMPLETE
  • Portion of North Stockton:  >North to Hammer Ln., >South to W. Lincoln Rd., >East to Pershing Ave., >West to Alexandria Place See Map  COMPLETE
  • Portion of Rural South County - Division Rd. Area: >North to Division Rd., >South to San Joaquin and Stanislaus Rivers, >East to Stanislaus River, >West to Two Rivers Rd See Map COMPLETE

• Ground spraying for adult mosquito control using  DeltaGard® and/or Evergreen 5-25 is scheduled for the morning of Thursday, September 18, 2025, between 3:30 a.m. and 6:00 a.m.
  • Delta Area: Tracy Blvd & Middle River: >North to Hwy 4, >South one mile south of Middle River, > East to one mile east of Tracy Blvd, >West to one mile west of Tracy Blvd. See Map COMPLETE
  • Portion of South Tracy: >North to Valpico Rd. > South to Ridgeview Dr. > East to MacArthur Dr. > West to Glenbriar Cir. See Map COMPLETE
  • Portion of Southeast Tracy: >North to Tulloch Dr. and Biarritz St., >South to Valpico Rd., >East to S. Chrisman Rd., >West to McKenna Dr., Eastlake Cir. and Lakeview Dr. See Map COMPLETE
  • Portion of Rural South County - Division Rd. Area:  >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 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
  • Portion of Northwest Stockton: >North to Eight Mile Rd. >South to White Slough >East to Davis Rd. > West to I5 See Map COMPLETE
• Ground spraying for larval mosquito control using Altosid Liquid larvacide concentrate is scheduled for the morning of Thursday, September 18, 2025, between 3:30 a.m. and 5:00 a.m.
  • Portion of Southwest Tracy: >North to W. Schulte Rd, >South to W. Central, >East to Tracy Blvd., >West to Sycamore Pkwy See Map COMPLETE

• Aerial spraying for adult mosquito control using Dibrom®, is scheduled for the evening of Monday, September 15, 2025, between 8:30 p.m. and 11:00 p.m.
  • City of Manteca: See Map  COMPLETE
• Aerial spraying for adult mosquito control using Evergreen 5-25 Air, is scheduled for the evening of Monday, September 15, 2025, between 8:00 p.m. and 10:00 p.m.
  • Delta Area: Portion of Brack Tract: See Map COMPLETE
  • Delta Area: South Staten Island and Portions of Brack Tract  See Map.COMPLETE

• Ground spraying for adult mosquito control using  DeltaGard® and/or Evergreen 5-25, is scheduled for the morning of Friday, September 12, 2025 between 3:30 a.m. and 6:00 a.m.
  • Portion of Southwest Stockton:  >North to Watercourse St., >South to Henry Long Blvd, >East to Weston Ranch San Joaquin Trail/Green Belt, >West to San Joaquin River  See Map COMPLETE
  • Portion of Rural South Farmington: >North to Little John Creek, >South to 1/2 mile south of Skiff Rd., >East to Biederman Way, >West to Van Allen Rd. See Map COMPLETE
     
• Ground spraying for larval mosquito control using Altosid Liquid larvacide concentrate is scheduled for the morning of Friday, September 12, 2025, between 3:30 a.m. and 6:00 a.m.
  • 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

• Ground spraying for adult mosquito control using  DeltaGard® and/or Evergreen 5-25, is scheduled for the morning of Thursday, September 11, 2025 between 3:30 a.m. and 6:00 a.m.
  • City of Escalon: North to Deborah Cir > East to St John Rd > South to Catherine Way > West to Swanson Dr  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
  • West Escalon: >North to Yosemite Ave., >South to Valdapena Wy, Thompson Way, Zinfandel Dr. and Daniels Ave., >East to McHenry Ave., >West to Brennan Rd. See Map COMPLETE
  • Rural East Ripon: >North to .6 mile south of Greenleaf Rd., >South to Stanislaus River, >East to Sexton Rd., >West to Wagner Rd. See Map COMPLETE
  • Portion of North Ripon: >North to SSJ Canal, >South to E. Milgeo Ave., >East to S. Murphy Rd., >West to N. Ripon Rd. See Map COMPLETE
  • Portion of Rural South County - Division Rd. Area:  >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 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
  • Southwest Tracy: >North to W. Schulte Rd, >South to W. Central, >East to Tracy Blvd., >West to Sycamore Pkwy See Map COMPLETE

• Aerial spraying for adult mosquito control using Dibrom, is scheduled for the evening of Thursday, September 4, 2025, between 8:00 p.m. and 10:00 p.m. 
  • Delta Area- Portions of Shima Tract, Rindge Tract, Wright Tract See Map COMPLETE
  • A Portion of Rural South County See Map  COMPLETE

• Ground spraying for adult mosquito control using  DeltaGard® and/or Evergreen 5-25, is scheduled for the morning of Thursday, September 4, 2025 between 3:30 a.m. and 5:30 a.m.
  • Portion of Delta North: >North to +- 1.5 miles north of W. Walnut Grove Rd., >South to W. Walnut Grove Rd., >East to Sacramento County Line, >West to +- .5 mile west of Sacramento County Line See Map COMPLETE
  • East Lodi Area: >North to E. Lockeford St.,  >South to E. Vine Street, >East to S. Cherokee Ln., >West to S. Stockton St. See Map  COMPLETE
  • 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
  • North Lathrop: >North to Roth Rd., >South to W. Lathrop Rd., >East  to RR Tracks, > West to S. Harlan Rd. See Map Postponed
  • 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
  • Portion of Rural East Lockeford: >North to Brandt Rd., >South to E. Sargent Rd., >East to Linn Rd., >West to N. Tully Rd. See Map COMPLETE

 

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West Nile Virus and
Dead Bird Hotline

(877) 968-BIRD (2473)

or online at westnile.ca.gov

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