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  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon1.1k+
    Verified french drain services reviews

Top-Rated French drain pros in Lathrop - Updated Nov 2026

Avatar for Mainline Plumbing Inc.
Mainline Plumbing Inc.
4.5(
210
)
Drain Clog or Blockage - ClearDrain Clog or Blockage - Clear - For BusinessDrain Line Breakage - Camera Locate+2 more

Serving Lathrop, CA and surrounding areas

Approved

In business since 2010

Emergency services offered

Warranties offered

"Mainline Plumbing sent Carmelo to my home to snake out the kitchen sink, and capped the outside pipe. Carmelo was on time, professional, very friendly, and finished the job in a timely manner. Thank you Mainline Plumbing, you guys are the BEST!!!"
Drain Clearing
Garbage Disposals
Plumbing Repairs
Tankless Heaters
Leak Detection

+2

Response time7 hrs
Response rate100%
3 neighbors recently requested a quote
Avatar for Top Tier Plumbing Inc.
Top Tier Plumbing Inc.
4.6(
41
)
Drain Clog or Blockage - ClearDrain Line Breakage - Camera Locate

Serving Lathrop, CA and surrounding areas

Approved

In business since 2023

Free estimates

Emergency services offered

"I called Top Tier plumbing after my son broke the shower handle. Taylor the owner was in the area and able to come by the same day and replace the broken internal plastic piece. Quick Response with Friendly and Efficient Service all for a GREAT price!"
Reset existing toilet
Plumbing upgrades
Plumbing upgrades
Plumbing upgrades
Water heater installation

+14

Response time3 hrs
Response rate96%
43 neighbors recently requested a quote
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French Drains FAQs, answered by experts

There are several common signs that your main sewer line may be clogged. Key indicators include multiple fixtures in your home draining slowly, gurgling sounds coming from drains or toilets, and water backing up into showers, sinks, or toilets. You might also notice water backing up from the plumbing system's drain cleanout, water in your basement drain, or unexplained wet patches on your lawn. Foul odors, such as the smell of raw sewage or rotten eggs, are another common symptom. The most reliable way to confirm a main sewer line clog is to hire a professional plumber to perform a camera inspection.

Professionals use augers, hydrojetting equipment, and cameras for precise clearing and inspection.

Keep your egress window from flooding by ensuring that the drainage system in the window well is clear and in good working condition. Inspect the window well every few months to remove any blockages and test the drainage system. It’s better to discover potential problems before your window well fills with water during heavy rain.

In most areas, drain cleaning professionals don’t technically need a license, as they aren’t altering your plumbing system in any way. However, we recommend hiring a drain cleaning professional with a plumbing license and certification. Certified plumbers are more likely to provide professional solutions to drain clogs without damaging your system. They’ll also have the diagnostic tools and experience necessary to remove the clog entirely rather than providing a temporary solution, as a handyperson might. Use Angi’s state licensing tool to check your plumber’s professional licenses before hiring.

On average, a plumber will take 30 minutes to two hours to clear a clogged drain. If the clog is located close to the drain or an access point and isn’t severe, the project will take about half an hour. If the clog is deep within your plumbing system or is a severe blockage, it can take two or more hours to remove the clog. For this reason, main line clogs tend to take longer, usually between two and three hours.

The Lathrop, CA homeowners’ guide to french drain services

From average costs to expert advice, get all the answers you need to get your job done.