Before spending hard-earned money on store-bought flea traps packed with harsh chemicals, try these simple homemade alternatives. While traps alone won’t wipe out an entire severe infestation—since flea eggs and pupae require a comprehensive cleaning routine—they are fantastic for monitoring flea activity, cutting down adult flea numbers, and measuring how well your pest control efforts are working.

The Classic Desk Lamp Flea Trap

This tried-and-true method relies on two things fleas cannot resist: warmth and light. Adult fleas leap toward the bulb and fall into a soapy solution that prevents them from escaping.

1. Set up a sturdy desk lamp with a warm, bright bulb.

Choose an adjustable lamp that can point straight down toward the floor or a tabletop. Incandescent or heat-producing bulbs work best because fleas seek body heat.

2. Pick a shallow dish or pie pan.

A wide, low-rimmed plate, pie tin, or baking dish gives fleas an easy landing target. If placing your trap along a baseboard or in a dark room, you can also position it right beneath a warm nightlight so the light beams directly onto the water.

3. Fill the pan three-quarters full with water and add dish soap.

Water alone won’t work because fleas are light enough to skate across the surface tension. A splash of liquid dish soap breaks that tension, ensuring any flea that jumps in sinks instantly.

4. Mix in just enough soap to tint the water.

A good rule of thumb is roughly 1 teaspoon of dish soap for every 2 cups of water. When mixed properly, the liquid should look faintly like pale lemonade. It is always better to add a little too much soap than too little. Highly concentrated soaps only require a couple of drops per cup.

5. Gently swirl the water to blend the soap without creating a layer of foam.

Foam can give fleas a dry platform to land on, so keep the surface smooth and clear.

6. Place the pan directly under the lamp and turn on the light.

Leave the light on overnight in areas where your pets spend the most time or where you suspect fleas are hiding. Fleas will hop toward the warm glow and drop into the soapy water.

The Window Glass Trap

If you prefer not to leave lamps running unattended overnight, harness natural daylight instead.

1. Fill several clear glasses or small bowls with the same soapy water mixture.

Some suggest using diluted bleach, but harsh chemicals present unnecessary risks to curious pets, toddlers, carpets, and upholstery. Plain dish soap is safe, odorless, and just as deadly to fleas.

2. Position the glasses along warm, sunny windowsills.

Sunlight naturally warms the glass and water, drawing fleas toward the brightness throughout the day. Once they hop inside, the soapy water pulls them under.

The Candle Trap

Candlelight provides the flickering warmth that fleas find irresistible in dark rooms.

1. Light a sturdy pillar candle on a heat-safe surface under close supervision.

Fleas jumping toward the flame often land directly in the warm wax and become stuck. Never leave open candles burning unattended or in homes with free-roaming pets.

2. For a safer alternative, float a small tea light in the center of a soapy water pan.

This combines the radiance of the lamp method with the gentle heat of a candle. The surrounding pool of soapy water catches jumping fleas while preventing the flame from scorching nearby surfaces.