Mosquito Control in Oshawa
For mosquito control in Oshawa, AstraHive Pest Control finds breeding zones, treats standing water that cannot be drained and treats resting areas, with a monthly program available from May to September. Durham Region's West Nile data, including a positive batch collected in Oshawa, shows why private property matters.
West Nile virus in Durham Region and Oshawa
| Item | What Durham Region reports |
|---|---|
| 2025 season | 21 human cases of West Nile virus and 26 WNV positive mosquito batches from adult trapping. |
| Surveillance | The Health Department sets mosquito traps across the region every week between June and September and sends mosquitoes for laboratory testing. |
| 2026 program | Surveillance and control began between May 11 and June 8, including larval surveillance, larvicide in catch basins and surface water sites, and adult trapping. |
| July 24, 2026 | A batch of adult mosquitoes collected from a trap site in Oshawa tested positive for West Nile virus. It was the second positive batch in Durham Region that season, after one in Ajax earlier in July. |
Sources: Region of Durham news releases, April 15 and July 24, 2026.
Residents can ask the Health Department to treat catch basins on their own property by using the online application at durham.ca/BYCBlarvicide, and can report stagnant water on public property at durham.ca/ReportStagnantWater. Those public tools stop at the property line, which is where the rest of this page starts.
Water in Oshawa: the lakeshore, Second Marsh and your yard
Oshawa's waterfront has a lot of natural water. The City describes Second Marsh as a provincially significant, 123-hectare wetland in the southeast of Oshawa that drains an area of just over 100 square kilometres, including Harmony Creek and its tributaries, and a pedestrian bridge over Oshawa Creek links the parkland on both sides to Second Marsh. Standing water on a private lot is a separate matter: gutters, buckets, tarps, ornamental ponds and bird baths all hold it, and the public programs cannot reach them.
July is the warmest month at 20.6 °C with 3.8 days a year above 30 °C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total precipitation (mm) | 66 | 57 | 54 | 73 | 79 | 74 | 73 | 77 | 94 | 70 | 85 | 71 |
| Mean daily maximum (°C) | -1.1 | 0.1 | 4.2 | 10.8 | 16.9 | 22.3 | 25.1 | 24.3 | 20.2 | 13.3 | 7.4 | 2.1 |
Environment and Climate Change Canada climate normals, 1981 to 2010, Oshawa WPCP station (4.3 km from Oshawa). A station is the nearest one with a full set of normals, not a reading from your street.
Mosquitoes in your Oshawa home or building?
Our licensed technicians start with an inspection and a clear plan for your property.
Call 905-925-8427How AstraHive Pest Control gets rid of mosquitoes in Oshawa
- Find the breeding zones. Gutters, low-lying areas, ornamental ponds and bird baths are checked first.
- Larvicide. Standing water that cannot be drained is treated to interrupt the breeding cycle.
- Treat resting areas. A residual treatment goes on dense foliage and shaded resting zones, and along foundation and perimeter edges.
- Follow-up. A monthly program from May through September is available.
All products we use are Health Canada approved and applied according to the product label. Our technicians are licensed by the Ontario Ministry of the Environment, Conservation and Parks (MECP). Our standard 90-day warranty applies to our treatments, and your technician confirms the terms for a seasonal mosquito program when you book.
What mosquito control looks like on an Oshawa lot
We start where water collects, then treat what cannot be drained and the leaves and shade where adults rest. Durham Region's own advice is to eliminate sources of standing water, and the program above treats public catch basins and surface water, so a yard visit and a request for catch basin larvicide complement each other. A monthly program from May through September keeps pace with the season. Oshawa's by-law section 5.12.1 requires properties to be kept free of conditions that may promote an infestation, and standing water is one of them.
Frequently asked questions: Oshawa
Did mosquitoes in Oshawa test positive for West Nile virus?
Yes. On July 24, 2026, Durham Region reported that a batch of adult mosquitoes collected at an Oshawa trap site tested positive. It was the second positive batch in Durham that season.
How many people got West Nile virus in Durham in 2025?
Durham Region reported 21 human cases and 26 West Nile virus positive mosquito batches in 2025.
Can Durham treat the catch basin on my property?
Residents can ask the Health Department to have larvicide applied to private property catch basins by completing the online application at durham.ca/BYCBlarvicide.
Where do I report stagnant water?
For stagnant water on public property, Durham Region directs residents to durham.ca/ReportStagnantWater.
When does mosquito season run in Oshawa?
Durham traps weekly between June and September. The Oshawa normals show a mean temperature above 10 degrees Celsius from May to September.
Sources
- Region of Durham: Health Department begins 2026 West Nile virus surveillance program . 2025 cases, program dates, private catch basins
- Region of Durham: Mosquitoes test positive in Oshawa for West Nile virus (July 24, 2026) . Oshawa positive batch
- City of Oshawa: Waterfront . Second Marsh, Oshawa Creek, Harmony Creek
- Environment and Climate Change Canada: Canadian Climate Normals 1981-2010 . monthly temperature, precipitation, frost days and degree-days