TNT Home Services
“I had someone else do the work because of this, but only called TNT back because Brent was super friendly when he came with the other guy and I needed finishing touches done.”
Best Drain Cleaning Services in Longmont, CO
24 contractors listed · 14 in Longmont · 6 open 24/7 · 13 open weekends · all 24 rated 4.5+
Data verified October 28, 2026
Mile High Radon Control
“Their professionalism and knowledge about radon and how to mitigate properly was wonderful and highly appreciated in the hectic times of purchasing a home.”
M and M Heating
“Derrick took extra time to look at the existing furnaces and AC units and remarked how they were a little long in the tooth (20 years old) So, I had been putting off replacing them for a couple of years, so I decided to take the leap and get them re...”
Bliss Water Heater & Boiler Repair Service
“I can genuinely say that they are not trying to nickel and dime you at this company, they care about providing a quality service to fix your issue in a timely manner.”
Longmont Water Heaters
“Mike also provided a very reasonable quote for his services to not only remove and replace the old water heater, but to also bring our hot and cold water pipes up to code and install an expansion tank.”
Everest Mechanical
“I quizzed him on an issue with my water heater while he was here and he gladly answered all my questions and told me what is needed to bring it up to code.”
The 24 companies listed for Longmont, CO clear blocked drains and sewer lines. Hours, jetting and camera work, and free estimate claims come from each company's own website. Ask who carries their own jetter rather than subcontracting it before you book.
Area overview: Longmont, CO
14 of the 24 contractors we list are based in Longmont; the other 10 serve Longmont from towns including Broomfield (15 mi), Boulder (13 mi) and Loveland (17 mi). The contractors on this page are rated from 4.5 to 5.0 across 8,980 reviews; 15 have 50 or more reviews. When customers rate these contractors on specific qualities, they most often praise professionalism (85%), responsiveness (83%) and quality (75%). The topics that come up most in reviews of the contractors on this page are "price", "communication" and "efficient". 6 are open around the clock; 13 are open on Saturdays and 12 on Sundays. 7 show a license on their websites; 1 lists staff certifications (NATE) and 4 have a BBB rating of A or A+. Domain records put 8 websites of the contractors on this page at ten or more years old; the oldest dates from 2004. 7 offer emergency call-outs; 7 offer financing or payment plans; 6 give free estimates; 4 are family- or locally-owned and 7 list coupons or special offers. 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.
What can I learn from these companies' websites?
A website is linked by 22 of the 24 listings for Longmont. Look for two things: whether they own a jetter and a camera or hire them in, and whether they show repair work as well as cleaning. A company that only cables will keep coming back for the same line.
Drain Solvers the Pros
“The "$99 specials" are big companies that only wants to sell you new sewer lines and will tell you whatever so you think its necessary to spend $15-30.”
Planet Plumbing & Drain
“Andrew found a great solution to the crazy situation I had under my kitchen sink, completed the work in record time, and left the space cleaner than when he arrived.”
The Drain Check
“Would definitely use him again if we had problems with our main drains below our concrete flooring that has a valley over an extended portion as revealed by Jeremiah's imaging.”
NG Companies
“Extremely efficient and professional company, as a former employee of more than four years I can say that they are truly a stand up team focused on safety, success and providing the greatest value possible for their customers.”
Boulder Water Heater Pros
“Promptness getting here to survey the issue & bid, plus my feeling it would be done right got them this job and with no regrets it was completely perfectly.”
Longmont Plumbing Services
“Very good attention to details Along with fixing our problem, the plumber Astel took the time to look at other possible problems and offered insightful advice for next upkeep.”
287 Plumbing Llc
“He came to our house at 6:00pm on a Friday night to replace our water heater when it died so we wouldn't have to be without hot water over the long weekend.”
ABC Drain & Sewer Cleaning
“Clayton (and his father before him) have kept my house pipes root free and kept my sinks and plumbing working wonderfully for decades.”
Mighty Plumbing and Heating LLC
“I don't believe this is the cheapest company to work with but the charge was very fair and the quality of the work was drastically better than the company who installed the previous unit.”
Bernie's Plumbing & Heating Company
“Bernie's was able to promptly and successfully find and correct a leak behind the shower wall, the only bathroom in the home, so time was clearly of the essence.”
Good Guys Home Services
“We don't have a lot of money since I'm a full time student so they accommodated our price budget by showing us what we could do and letting us do the work even though it meant they got LESS MONEY.”
Canyon Plumbing & Heating
“It's easy to find someone who up charges you but this feels like the first time someone has done everything in their power to find a way to finish the job for as cheap as possible.”
Tri Town Plumbing & Heating
“Overall, Tri Town Plumbing & Heating exceeded my expectations, and I highly recommend them for their professionalism, quality work, and great communication.”
Finish Plumbing
“In my profession I've worked with literally, hundreds of contractors (commercial) over the years and I'd put Dominik at the top of my list if I were hiring someone who'd I'd be working with directly.”
Daniel & Donna Plumbing Service
“The staff clearly knows how to communicate with their clients in a timely manner, give great prices, and their expertise shows when they deliver quality work.”
Jim Needham Heating Cooling Plumbing and Drain
“He answered all the questions I had and helped me find the best option for me when it came to my garbage disposal I highly recommend him and Jim Needham Plumbing!”
Hankel's Drain Cleaning
“I forget the man's name that I spoke with but he was very patient In explaining my homes needs and even informed me that the service I was inquiring about was not needed at this time.”
Craig Plumbing Heating & Cooling LLC
“Dean and Joe were prompt, courteous, and informative - gave me a logical answer to a question I've had since I moved in regarding my furnace behavior in the winter.”
Why these companies made our list
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