Can Bugs Really Come in Through Your Drains?

Understanding a Common Concern for Phoenix Homeowners

If you’ve ever seen a bug crawl out of your shower drain or noticed tiny flies hovering near your sink, you’re not alone. In Phoenix, pests are resilient and resourceful—constantly adapting to the region’s arid climate in search of moisture. This drive leads some insects right into your home through plumbing and drain systems. While it may seem like urban legend, bugs really can find their way in through drains—especially if your plumbing traps are dry or you have unsealed entry points around pipes.

At Scorpion King Exterminating, we’ve seen this scenario more times than we can count. From sewer roaches to drain flies, pests that exploit drain systems are common in the Phoenix metro area. This blog covers which pests are most likely to enter this way, why it happens more often here, and how you can prevent them.

The Most Common Drain-Related Pests in Phoenix

Two sections of this post will use bullets—this is the first.

• American Cockroaches: Also known as sewer roaches, they thrive in humid, dark places and can crawl through drainpipes, especially if water traps dry out.
• Drain Flies: These small, fuzzy insects breed in the organic film that lines slow or unused drains. They don’t bite, but they’re a sanitation concern.
• Ants: Some species follow plumbing lines, especially when moisture or leaks are present behind walls or beneath floors.
• Silverfish and Firebrats: These thrive in damp conditions and can appear in bathrooms where water collects.

It’s not always the pipe itself that’s the issue—sometimes it’s the small cracks or gaps around your plumbing fixtures that serve as the main access point for pests.

Why Phoenix Homes Are Especially Vulnerable

Phoenix’s extreme heat and arid conditions make moisture an attractive and sometimes necessary resource for insects. According to the University of Arizona Cooperative Extension, pests like cockroaches and ants are more likely to move indoors when temperatures spike or during prolonged dry spells. Drains, pipes, and under-sink areas provide a micro-habitat of moisture and shade—an ideal shelter for many common pests.

When P-traps dry out from disuse—common in guest bathrooms, laundry rooms, or seasonal homes—they no longer form a water seal. This allows both foul odors and small pests to make their way into your home.

Signs That Pests Are Using Your Drains

Wondering if your drains are a pest entry point? There are some clear signs that suggest they may be:

• Persistent sightings of cockroaches or flies near drains or bathroom fixtures.
• Musty or sewage-like odors coming from sink or shower drains.
• Insects emerging from drains, especially in the kitchen or bathroom.
• An uptick in pest activity after a period of disuse (e.g., returning from vacation).

If you notice any of these signs, it’s a good idea to have a professional assess your plumbing areas for pest vulnerabilities. Our team at Scorpion King Exterminating frequently pinpoints these entry zones during inspections.

Preventing Drain-Related Pest Activity

The second bulleted section begins here:

• Keep P-traps wet: Run water through infrequently used drains at least once a week to prevent the traps from drying out.
• Use enzymatic drain cleaners: These non-toxic solutions break down organic matter that attracts pests without harming your pipes.
• Seal around pipes: Caulk or foam any openings where plumbing enters walls or cabinetry.
• Install drain screens: This adds a physical barrier to prevent insect access.
• Fix leaks: Moisture buildup from under-sink drips is a huge attractant for pests.

Keeping a clean and dry environment—especially under sinks and around floor drains—goes a long way toward preventing infestation.

Are Pests Coming Through the Water Supply?

This is a common misconception. Pests aren’t coming up through your potable water lines. Instead, they access homes through unused drain lines, sewer access points, and plumbing chases. A report by Purdue University’s Entomology Extension supports this: cockroaches often follow warm air currents and moisture into homes through gaps around plumbing fixtures—not by swimming up your pipes.

Professional Support and Long-Term Protection

If pests are showing up in bathrooms or kitchens, it’s time for a closer inspection. Scorpion King Exterminating offers detailed service assessments and targeted treatments to eliminate the pests you see—and the ones you don’t.

Our pest management strategies often include a comprehensive inspection of plumbing systems, sealing vulnerabilities, and applying products around drains and entry points that are effective against moisture-seeking insects.

Don’t Let Drains Be an Open Door

Your bathroom sink or laundry room drain might not seem like a threat—but it can be a surprising entryway for pests, especially in Phoenix’s challenging climate. Staying vigilant with moisture control, routine drain maintenance, and structural sealing can significantly reduce your chances of seeing bugs emerge from your plumbing.

Need help diagnosing or treating a drain-based pest issue? Reach out to Scorpion King Exterminating. We specialize in pest control designed for the unique challenges of the desert environment—and we know how to handle the pests that think your drain is an open invitation.