Tiny Bugs in the Bathroom? Silverfish, Drain Flies or Springtails

Tiny bugs in the bathroom in South Florida are usually one of three things: silverfish, drain flies or springtails. All three are telling you the same thing, which is that something in that room stays damp. Fuzzy little flies sitting on the wall near the drain are drain flies. Tiny specks that jump when you touch them, around the tub or the sink, are springtails. Fast, silvery, carrot-shaped insects that dart away when you flip on the light at night are silverfish. Find the damp spot, run water in the drains nobody uses, and most of the problem goes with it.

Why tiny bugs show up in the bathroom nobody uses

It's almost always the guest bath, the kids' bathroom that only gets used on weekends, or the whole condo after it sat closed all summer. A few things happen in those rooms:

• The drain traps dry out. Without water in the trap, the drain is open to whatever lives in the line.
• Nobody runs the fan. Humidity hangs around, especially in an interior bathroom with no window.
• A slow leak goes unnoticed. A toilet that weeps at the base, a drip under the vanity, a caulk line that cracked.
• The AC closet is next door. A damp air handler closet or a sweating line shares a wall with a lot of South Florida bathrooms.

If you've just come back to a place that was closed up for months, our back for the season checklist covers the rest of the house too.

Springtails

Springtails are so small most people think they're dirt until the dirt jumps. They don't bite, and they don't damage anything. They're just a very clear sign of moisture. In bathrooms they gather on the edge of the tub, around the sink and along a damp window sill, and they can wander in from wet mulch or soil outside the wall. Our springtails page explains why they come in after heavy rain.

What you can fix yourself this week

1. Run water in every drain for a minute or so: sinks, tub, shower and any floor drain. Do it once a week in rooms nobody uses.
2. Scrub the drain opening and the stopper with a stiff brush. That's where the film starts. Skip the bleach and the drain chemicals; they don't clear the film well and they don't mix well with each other.
3. Run the bathroom fan during and after showers, and leave the door open when you can.
4. Use a dehumidifier in a closed-up unit, or set the AC so it keeps running while you're away.
5. Fix the leak. Look under the vanity, around the base of the toilet and along the tub caulk. If it's a cracked pipe or a bad seal, call a plumber. No treatment fixes a leak.
6. Clear out the paper. Old magazines, cardboard boxes and stacks of toilet paper under the sink give silverfish food and cover.

What we do about it

We start by finding where the moisture is coming from, because that's what keeps these pests coming back. For drain flies, we find which drains are producing them and use drain treatments made to break down the film the larvae live in, plus targeted treatment for resting adults. For silverfish, we treat the cracks, crevices and voids where they hide. For springtails, we treat the perimeter and entry points so fewer come in, and point out the damp areas to fix. Keep kids and pets off treated areas until dry, and follow your technician's instructions.

All three are general household pests, the kind our regular pest control service handles. Our general plan is $125 per quarter, about $42 a month. If you're on that quarterly plan, drain treatments for drain flies are included as needed, at no extra cost. Monthly or custom schedules are quoted after the inspection. For plan customers: "If pests come back between visits, so do we, at no extra cost." There are no long-term contracts and no cancellation fees, just a simple service agreement. We're family-run and licensed, with 30+ years in the business, and hablamos español. More reading in our guides.