Licensed · Local · Since 1996

Our work

We build long-term relationships through honest assessments, clean job sites, and repairs done to code—not quick patches that fail next season.

Walnut dispatch. We serve Covina, Glendora, Pomona, Chino Hills, and communities across the San Gabriel Valley and nearby L.A. & San Bernardino Counties. Our service regions →

Call (626) 332-9984

Drain Doctor plumbing professional on a service call in the San Gabriel Valley

Drain Doctor plumbing service in the field

1996 Serving the Valley

24/7 Emergency Service

#803591 CA Licensed

Same Day When You Need Us

What we do every day

Real jobs, real homeowners

Every home and business is different. What stays consistent is our process: diagnose with the right tools, explain options in plain language, and complete the work with permits and manufacturer specs in mind. Browse our services, see where we dispatch, or request service online.

Recent project

Tank to tankless water heater upgrade

We replaced an aging 75-gallon tank water heater with a new tankless system—giving the homeowner continuous hot water, better efficiency, and a more compact setup in the same closet.

Before: 75-gallon tank water heater in a utility closet — Existing 75-gallon tank water heater

After: wall-mounted tankless water heater with new copper piping — New tankless water heater install

Removed the existing 75-gallon tank water heater
Installed a new tankless water heater
Provides endless hot water for daily household needs
Improves overall energy efficiency
Saves space with a more compact system design

The homeowner can now enjoy continuous hot water without running out during busy mornings or back-to-back showers—a smart upgrade that adds comfort, efficiency, and value.

Water heater repair & replacement Read the full project story

Drain & sewer

Clearing tough clogs, hydro-jetting, camera inspections, and sewer line repair—with options to minimize digging when it makes sense for your property.
Water heaters & fixtures

Tank and tankless water heater work, leak repairs, fixture upgrades, and whole-home repiping support from a licensed team you can reach directly.
Emergency response

Same-day and 24/7 dispatch across our service regions. When water is where it should not be, call (626) 332-9984 and we will prioritize safety first.

Ready to talk about your project? (626) 332-9984 · Contact us

Dispatch & office

Our Walnut headquarters

Drain Doctor Plumbing & Rooter

3820 Valley Blvd Unit O
Walnut, CA 91789

Open in Google Maps (626) 332-9984

Where we work

Service regions

We’re your local plumbing company—not a referral site. Trucks roll from Walnut across the San Gabriel Valley and into nearby parts of Los Angeles and San Bernardino Counties. Each region below has its own page with neighborhoods we talk about most often.

Also serving

See our other service areas →

Don’t see your city? Contact us—we may still be able to help.

24/7 emergency response

Emergency plumbing—We're prepared, anytime

Burst pipes, major leaks, or sewer backups? Don't wait. Our licensed plumbers are available day or night with the right tools to stop damage and fix the problem.

(626) 332-9984

24/7 Emergency Service · Same-day dispatch when you need it most