Call the Plumbing Doctor Inc. & Call the Foundation Doctor Inc.
“Both Brandon and Eddie the technicians that came to do the job were extremely polite hard working and great job cleaning up afterwards.”
Best Drain Cleaning Services in Oshawa, ON
15 contractors listed · 12 in Oshawa · 5 open 24/7 · 8 open weekends · 14 rated 4.5+
Data verified October 19, 2026
Vaillancourt Plumbing & Drains
“Sinclair attended and replaced two spigots and three shutoffs quickly and efficiently.”
Throne Plumbing & Gas Ltd
“They helped out my parents on several occasions, which I am very grateful for.”
Central Drain Service Inc.
“Clean and courteous and very knowledgeable I would recommend to anyone with a drain issue Thanks again Central Drain”
Multi-Trade Building Services
“Paul and Jackie were in touch with us every step of the way and if I ever had any questions they were always good to get back to us right away.”
CDN Plumbing
“He has a great personality and is not only dependable but very trustworthy.”
The 15 companies listed for Oshawa, ON clear blocked drains and sewer lines. Hours, jetting and camera work, and free estimate claims come from each company's own website. Ask whether the crew that arrives owns the camera, since that decides what you learn.
Area overview: Oshawa, ON
12 of the 15 contractors we list are based in Oshawa; the other 3 serve Oshawa from Whitby (8 km). The contractors on this page are rated from 4.0 to 5.0 across 3,948 reviews; 5 have 50 or more reviews and 14 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (90%), responsiveness (83%) and quality (80%). 5 are open around the clock; 8 are open on Saturdays and 7 on Sundays. 1 shows a licence on its website. 5 have ten or more years of experience, the longest 26 years. 5 offer emergency call-outs; 1 offers financing or payment plans; 4 give free estimates; 5 are family- or locally-owned and 1 lists coupons or special offers. We have a website on file for 14 of the contractors on this page; 12 publish a contact page and 9 list a public email. We count these figures across the contractors on this page; distances are straight-line, and hours and prices change, so confirm the details with the contractor before you book.
Are any of the listed drain crews available overnight?
Overnight availability is claimed by 5 of the 15 listings here. A backup that has reached a finished basement floor is worth the night rate, because standing sewage is a health problem rather than an inconvenience. A slow sink is not. Ask what the after-hours charge covers before agreeing.
Need A Hand Commercial and Residential Services
“If you Need A Hand with ANY project inside or out, you can count on these folks to get it done on time and on budget right to your specifications.”
Lundy Plumbing & Heating
Renmar Services
Manulock Construction Incorporated
“James and his team were very professional and creative resulting in a finished product that has totally transformed an old, tired and nonfunctional basement into a new, modern and beautiful part of the home.”
Quantum Contracting Limited
“Can't express enough how very, very pleased we are with Andy and crew!”
Ben Huston Plumbing & Piping Ltd
“Huston Plumbing is extremely knowledgeable and friendly.”
2 Bro's Plumbing
“Celeste was very responsive, honest (explained options to me), professional and knowledgeable!”
Plumbing & Heating Heroes
“We were in a bind with our toilet and Camilo came out and was not only friendly, he was knowledgeable and he fixed our toilet.”
Limcan Certified Heating and Air Conditioning
“This company has provided annual maintenance on all our HVAC units over the past 20 years and we continue to be pleased.”
Why these companies made our list
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