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  • Average homeowner rating star icon4.4
    Average homeowner rating
  • Verified reviews icon3.4k+
    Verified french drain services reviews

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

Avatar for Masterworks Plumbing Co., LLC
Masterworks Plumbing Co., LLC
5.0(
37
)
Drain Clog or Blockage - Clear

Serving Cornelius, OR and surrounding areas

Approved

In business since 1996

Emergency services offered

Warranties offered

"Anton and his son Marco came to our home and replaced our waterline and our neighbors waterline. They also de-scaled and flushed our tankless water heater and rebuilt our toilet tanks. The communication was fantastic, the knowledge was so appreciated, and the work was efficient and thorough. It was a joy to have them working in our home. I would highly recommend them to anyone in the future."
5 neighbors recently requested a quote
Recommended by87%of homeowners
Avatar for Realistic Rooter, LLC
Realistic Rooter, LLC
4.9(
109
)
Drain Clog or Blockage - ClearDrain Clog or Blockage - Clear - For Business

Serving Cornelius, OR and surrounding areas

Approved

In business since 2018

Free estimates

Emergency services offered

"Anthony was extremely knowledgeable and explained everything so clearly. He suggested I replace the narrow galvanized drain pipe or the clog would happen again. Which it has several times. I agreed on the replacement and he went ahead and snaked the drain so I could use the sink and washer until he could come back and do the job. I will definitely call him again."
New P-Trap
Old Ptrap
Response time3 hrs
1 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Sewer Renewal Specialists, LLC
Sewer Renewal Specialists, LLC
4.9(
56
)
Drain Clog or Blockage - ClearDrain Line Breakage - Camera Locate

Serving Cornelius, OR and surrounding areas

Approved

In business since 2009

Free estimates

Emergency services offered

"David was very professional and skilled. On a Sunday, he responded quickly to my urgent request (water was backing up into my bathtubs due to an underground pipe breakage). He was able to identify the source of the problem (which was not straightforward), cleaned and fixed a broken exterior underground drain (with Nu Drain). He even identified and fixed another displaced drain connection, and installed a cleanout at the exterior of home. He had a very positive attitude (even in the cold rain) and stayed until it was done (while working in the dark). He was very good at explaining the situation and the work that needed to be done. He seems to have state-of-the-art equipment. He went above and beyond my expectations. I will highly recommend him to my friends and family. Would definitely hire this service again."
Before and After
Measuring and Mixing Epoxy
Installing Epoxy in Liner
Prepping liner for installation
Orangeburb pipe after photo

+7

Response time11 hrs
29 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for Clear Flow Drains & Rooter, LLC
Clear Flow Drains & Rooter, LLC
5.0(
5
)
Drain Clog or Blockage - ClearDrain Line Breakage - Camera LocateDrain Clog or Blockage - Clear - For Business+1 more

Serving Cornelius, OR and surrounding areas

Approved

In business since 2025

Free estimates

Emergency services offered

Clear Flow Drains & Rooter LLC is your trusted local expert for professional drain cleaning and sewer services throughout the Portland–Vancouver metro area. We are locally owned, licensed, bonded, and insured, providing reliable service at honest, affordable prices.\n\nOur services include:\n\nResidential drain cleaning starting at $199\n\nMain sewer line cleaning\n\nHydro-jetting\n\nSewer camera inspections\n\nKitchen, bathroom, and laundry drains\n\nCommercial drain cleaning\n\n24/7 emergency drain services\n\nWe take pride in quality workmanship, upfront pricing, and exceptional customer service. No unnecessary upselling, no hidden surprises—just dependable solutions to get your drains flowing again!\n\nClogs Don't Stand a Chance!\n\nCall (360) 360-8462 today for fast, professional service!

7 neighbors recently requested a quote
Avatar for Axiom PDX
Axiom PDX
4.6(
73
)
Drain Clog or Blockage - ClearDrain Line Breakage - Camera Locate

Serving Cornelius, OR and surrounding areas

Approved

Super Service Award Winner

In business since 2013

Free estimates

Warranties offered

"They saved me $$$ thousands of dollars. These people are great. I had a clogged drain so I call plumber. The plumber that fixed my drain said I needed a new sewer main. So I got five different bids. Axiom PDX gave me bid which was less than the others but was honest enough to tell me a new sewer line was not necessary."
Muddy sewer repair!
root intrusion repair
New sewer install
Response time10 hrs
Response rate97%
221 neighbors recently requested a quote
Avatar for Mr. Rooter Plumbing
Mr. Rooter Plumbing
4.4(
97
)
Drain Clog or Blockage - ClearDrain Line Breakage - Camera Locate

Serving Cornelius, OR and surrounding areas

Approved

In business since 1995

Free estimates

Emergency services offered

"I had a clogged drain that no amount of plunging could get rid of. I called several companies. I initially went with Mr Rooter because they were the only ones that could make it out that same day. Glad I did. The technician was very pleasant and he took his time to explain all the steps he was doing and let me watch as he put a camera down the drain and showed me on the screen where the clog was and all the build-up in the pipes. He then brought in a high pressure washer and I watched on the screen as he cleaned the pipes all the way down to where it joined up with the main sewer line. I initally thought the estimate was a little high, but not after watching all that they (his supervisor also showed up after an hour to help out) did."
Bathroom Plumbing
Bathroom Plumbing
Bathroom Plumbing
Bathroom Plumbing
Water Heater Installation

+36

2 neighbors recently requested a quote
Recommended by94%of homeowners
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French Drains FAQs, answered by experts

Most clogs are resolved quickly, often within an hour. More complex issues requiring pipe disassembly might take longer.

To unclog a plumbing vent, you first need to locate it. Look at your home's roofline. The plumbing vent will be a vertical pipe sticking straight up from the roof. Since this pipe runs all the way to the main drain underneath your house, you should also be able to find it in the attic.

If you have a sink stopper, it can feel more challenging to clean the drain without removing it, but here are a few simple steps:

  • Pour ½ cup baking soda into the drain using a funnel

  • Pour 1 ½ cups vinegar into the drain

  • Close the sink stopper for 15–20 minutes

  • Open the drain

  • Pour 2 cups of boiling water down the drain (be cautious as boiling water can damage some types of pipes)

If the drain isn’t unclogged, repeat the process.

A sewage smell in your crawl space is usually from a damaged or clogged pipe leaking sewer gasses or actual sewage underneath your home, but there are some other common causes. Moisture, from poor or damaged encapsulation or a malfunctioning sump pump, can harbor mold and bacteria, causing a musty smell. Pests can also get stuck in your crawl space and die, which causes a sewage-like odor.

Professional tools include drain snakes, hydro jets, cameras for line inspection, and enzymatic or chemical cleaners for dissolution.

The Cornelius, OR homeowners’ guide to french drain services

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