Mosquito Control at Home: Beyond the Bed Net

Mosquito control at home means removing the standing water mosquitoes need to breed, not just protecting yourself while you sleep. A bed net only reduces the risk of being bitten indoors at night; it does nothing to stop mosquitoes multiplying in the flower pot, blocked gutter, or open water drum outside your door. The most effective home-based approach combines weekly removal of standing water (source reduction), screening or covering any water that must be stored, and indoor protection such as nets and indoor residual spraying. Done together, these steps address mosquitoes at every stage of their life cycle, not just the biting stage.

Kenya has made real progress against malaria. The Ministry of Health reported in April 2026 that national malaria prevalence had fallen from 8% in 2015 to 6% in 2025, with a 31% reduction in incidence over the last three years, supported by the distribution of over 14.6 million long-lasting insecticidal nets and indoor residual spraying reaching 95% coverage in targeted areas.

That progress is real, but the risk has not disappeared. An estimated 70% of Kenya's population still lives in areas at risk of malaria transmission, including roughly 14 million people in endemic lowland zones and a further 17 million in higher-altitude areas where transmission is seasonal or epidemic. The lake and coastal endemic counties, including Kisumu, Siaya, Homa Bay, Migori, Busia, Kakamega, Kilifi, Kwale, and Mombasa, carry the highest ongoing burden.

This matters for home prevention for a simple reason: bed nets and indoor spraying protect people indoors at night, but they do nothing to reduce the number of mosquitoes breeding around a home in the first place. A property can be fully compliant with net usage and still have several active breeding sites in the yard.

What Is Source Reduction, and Why Does It Matter More Than People Think?

Source reduction means physically removing, covering, or treating the standing water where mosquitoes lay eggs and larvae develop, before they reach adulthood and start biting. A mosquito's full life cycle, from egg to flying adult, can take as little as 7-10 days in warm conditions, which means a container holding water for less than a week can still produce a new generation of biting mosquitoes.

A study conducted in Kwale County, coastal Kenya, found that most households did not recognise covering or emptying water containers as a deliberate mosquito-control action, even when they were already doing it for other reasons, such as keeping drinking water clean. The research concluded that many effective interventions require minimal extra effort if they are simply reframed and consistently applied, which is the basis for the checklist below.

8 Mosquito Breeding Sites Around Kenyan Homes, and How to Fix Each One

1. Water storage drums and jerricans

Common in homes without a constant piped supply. Always use a tight-fitting lid or a fine mesh screen over the opening. An uncovered drum left for a few days is one of the most productive breeding sites in many Kenyan compounds.

2. Old tyres and discarded containers

Tyres hold rainwater in their curve and are notoriously difficult to fully drain. Store them under cover, puncture the base, or dispose of them entirely. The same applies to tins, broken pots, and plastic containers left lying around the yard.

3. Blocked gutters and roof drainage

Leaves and debris cause water to pool at roof level, often unnoticed because it's out of sight. Clear gutters after every heavy rain, particularly during the long and short rains.

4. Flowerpot saucers and plant trays

Small amounts of water in saucers are easy to overlook precisely because they look harmless. Empty them at least twice a week, or remove saucers entirely during peak mosquito season.

5. Construction sites and building materials

Blocks, broken bricks, and uneven ground on or near building plots frequently collect rainwater. If you're building or renovating, check the site weekly, not just the finished house.

6. Ponds, water features, and livestock troughs

Water that can't be removed should be kept moving or treated rather than left still. A small pump or fountain disrupts the calm surface mosquito larvae need, and livestock troughs should be scrubbed and refilled regularly rather than topped up indefinitely.

7. Low-lying ground and poor drainage

If a section of your compound holds water for more than two to three days after rain, it's worth levelling the ground or improving drainage. Persistent puddles are a reliable sign of a recurring breeding site, not a one-off inconvenience.

8. Overgrown vegetation around the house

Tall grass and dense shrubs close to the house don't hold water themselves, but they give adult mosquitoes a place to rest during the day, close to where people live and sleep. Keeping vegetation trimmed near entry points reduces this resting habitat.

Indoor Protection Still Matters, Alongside Source Reduction

Removing breeding sites reduces the number of mosquitoes produced around your home, but it won't stop mosquitoes that fly in from elsewhere. Indoor protection remains essential, particularly in endemic and seasonal-risk counties:

• Sleep under a long-lasting insecticidal net (LLIN) every night, even outside the rainy season, and check it regularly for holes or wear.
• Screen windows and doors where possible, particularly in homes near water bodies or in known transmission zones.
• Take part in indoor residual spraying (IRS) programmes when offered in your area; the Ministry of Health has expanded IRS coverage to 95% in targeted high-burden counties.
• Use household insecticide sprays or coils as a supplement, not a replacement, for nets and source reduction.

When to Bring in Professional Mosquito Control

Some breeding sites can't be fixed with a weekly walk-around. Permanent water features, large compounds, blocked drainage at the property or estate level, and persistent mosquito problems despite consistent source reduction are all situations where professional treatment makes a measurable difference. Professional services can apply larvicides to water that cannot be drained, treat resting sites in dense vegetation, and identify breeding sites that are easy to miss on a casual inspection, especially in larger residential compounds, schools, and commercial properties.

Frequently Asked Questions

How often should I check my home for mosquito breeding sites?

Once a week is enough for most homes, since a mosquito can complete its life cycle from egg to biting adult in as little as 7-10 days in warm conditions. After heavy rain, it's worth doing an extra check, since new puddles and blocked drains can appear quickly during the long and short rains.

Is a bed net enough to protect my family from malaria?

A bed net significantly reduces your risk of being bitten while you sleep, but it does not reduce the number of mosquitoes breeding around your home. The most effective approach combines nightly net use with weekly removal of standing water, since this addresses both the biting mosquitoes already present and the next generation developing nearby.

Which areas of Kenya have the highest malaria risk?

The lake endemic zone, including Kisumu, Siaya, Homa Bay, Migori, Busia, Vihiga, and Kakamega counties, and the coastal endemic zone, including Kilifi, Kwale, Mombasa, and Tana River counties, carry the highest ongoing malaria burden in Kenya. Highland areas above roughly 1,600 metres, including Nairobi, are generally low-risk or malaria-free, though seasonal and epidemic transmission can still occur in some highland-fringe areas.

Can I treat standing water I can't remove, like a pond or water tank?

Yes. Where water genuinely cannot be drained, larvicide products containing Bti (Bacillus thuringiensis israelensis) can be added safely; these target mosquito larvae specifically without harming people, pets, or most other wildlife. For larger or recurring problems, a professional pest control provider can assess and treat water sources that are impractical to manage through household action alone.