MOSQUITO PREVENTION
Mosquito prevention around Sydney homes: a practical water-and-screen checklist
Mosquito prevention starts with small, repeatable checks—not a promise to remove every mosquito outdoors. Use this checklist to reduce water, improve barriers and protect people sensibly.
A few mosquitoes near an open door can have a different source from repeated activity in a courtyard, balcony or garden. Start by working out where and when they appear, then check the small water-holding items and entry points that are easy to miss. The goal is to make the property less supportive of mosquitoes while keeping advice practical for houses, rentals and apartments.
1. Confirm that the pattern fits mosquitoes
Record the time, room or outdoor area and approximate number seen. Note whether activity is strongest near doors, damaged screens, shaded vegetation or a particular container. A clear photograph can help distinguish mosquitoes from drain flies, fungus gnats and other small flying insects, but avoid relying on colour alone.
Check more than the obvious backyard. Balconies, shared courtyards, bin areas, plant collections and ground-level service spaces can all hold useful clues. In a strata building, activity across several lots or common areas may require a coordinated inspection rather than action inside one unit only.
2. Empty, clean or cover water-holding items
Walk around accessible areas after watering or rain. Empty buckets, toys, tarpaulin folds, pot saucers and other containers that are not meant to hold water. Clean them before storing them upside down or under cover. Refresh pet water as part of normal care, and keep birdbaths or other intentional water features maintained rather than simply topping them up.
Check small containers and plant saucers each week.
Keep rainwater-tank openings and overflows properly screened.
Report blocked drainage, leaks or persistent pooling.
Do not climb onto roofs or ladders to inspect gutters, and do not pour pesticides, bleach or homemade mixtures into drains, ponds or stormwater systems. Ask the appropriate property or trade contact to assess inaccessible drainage. Renters should photograph recurring pooling and notify the property manager before altering fixtures.
3. Improve the barrier between outdoors and in
Inspect flyscreens for tears, loose edges and gaps around the frame. Check door seals, especially where a light is close to the entrance. Close unscreened windows when mosquitoes are active, and avoid propping open common-area doors. If repairs are needed in a rental or strata property, record the exact window, door or vent so the responsible contact can act.
Keep vegetation from resting directly against frequently used doors and screens where practical. Outdoor lights can draw small flying insects toward entrances, so switch off unnecessary lights or position them away from an open doorway. Never block required ventilation, drainage points or fire-safety features as a pest-control shortcut.
4. Use personal protection and products carefully
Property changes reduce opportunities, but personal protection still matters outdoors. NSW Health recommends loose, long, light-coloured clothing and covered footwear, particularly when mosquitoes are active. Its guidance also explains which repellents are effective and how to apply them to exposed skin. Read the full NSW Health bite-prevention advice, including advice for children and reapplication.
For any repellent or pesticide, use a product registered for the intended purpose and follow the current label exactly. The APVMA explains correct chemical use. Do not improvise mixtures, exceed label directions or assume a product suitable for one setting is suitable for another.
5. Recheck weekly and know when to escalate
Repeat the water and screen check weekly and after rain. Keep a brief note of sightings and locations so you can see whether activity is reducing or simply moving. Continued high activity, an inaccessible water source, damaged building drainage or a pattern across multiple apartments is a reason to involve the property manager, strata contact, council or a pest professional, depending on the source.
An inspection can help identify accessible breeding conditions and recommend a property-specific scope, but it cannot prevent every mosquito from flying in from surrounding areas. If a person becomes unwell after bites, seek medical advice rather than trying to diagnose the cause from the bite marks.
NEED HELP FINDING THE SOURCE?
Text your suburb, property type and where activity is worst.
Include the time of day and any recurring water nearby.