Bernie's Plumbing & Heating Company
“Twice in the last year I've needed Bernie's to come out - once when my old boiler pump needed replacing, and once when I had no hot water and a zone valve to my big hot water tank had broken.”
Best Drain Cleaning Services in Boulder, CO
24 contractors listed · 7 in Boulder · 6 open 24/7 · 15 open weekends · 23 rated 4.5+
Data verified October 28, 2026
Canyon Plumbing & Heating
“He completed the work replacing a couple of 60 year old frozen values and corroded piping within the time frame he stated up front, and stayed cool even though he had to start the project by unexpectedly searching for the water shutoff buried in our ...”
Dr. Drain
“Thank you, Jordan; I will continue to use your company for all the big projects my company is not set up to perform - as Jordan and his team are honest, fair and hyper-conscientious with their attitudes and professionalism in front of my clients, an...”
Mesa Plumbing
“I waited for a few days before adding to this review to see how the system performed in a range of weather conditions ranging from dry and mild temperatures to snow and cold with the temperature falling as low as 18 degrees and staying below freezing...”
Brown Plumbing & Heating
“Steve Brown has twice now, gotten on the phone on a Sunday and helped me troubleshoot problems to the point that I was able to deal with them.”
American Rooter
“More than anything these guys were honest and reasonable.”
The 24 companies listed for Boulder, 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: Boulder, CO
7 of the 24 contractors we list are based in Boulder; the other 17 serve Boulder from towns including Longmont (13 mi), Broomfield (12 mi) and Westminster (14 mi). The contractors on this page are rated from 4.1 to 5.0 across 11,741 reviews; 19 have 50 or more reviews and 23 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (92%), responsiveness (84%) and quality (80%). The topics that come up most in reviews of the contractors on this page are "price", "estimates" and "efficient". 6 are open around the clock; 15 are open on Saturdays and 12 on Sundays. 7 show a license on their websites; 2 list staff certifications (NATE) and 9 have a BBB rating of A or A+. Domain records put 14 websites of the contractors on this page at ten or more years old; the oldest dates from 1999. 8 offer emergency call-outs; 7 offer financing or payment plans; 9 give free estimates; 7 are family- or locally-owned and 12 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 all 24 listings for Boulder. 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.
Fresh Boulder Plumber
“Doug is super responsive, knows what he's doing, fairly priced and a great guy!”
TNT Home Services
“The plumber who arrived (who was also an IT specialist during his Uniformed Service), provided an expert evaluation, demonstrated depth of knowledge of the challenges/materials/risks, stepped up with the ability to improvise solutions.”
Afford-a-Rooter Plumbing Services
“When I discovered the sump pump in my crawlspace was shooting water up into the air, I called Afford-A-Rooter on Saturday morning after never hearing back from another company that did subsequent work in the crawl space after the initial sump pump in...”
Flatirons Plumbing
“Always fix the issue promptly, very professional, polite and friendly, always very knowledgeable about the issues, explain clearly, do not complicate or talk down—all without outrageous cost.”
Jd's Denver Plumbing
“Adam is a true professional, very knowledgeable quik and efficient, and friendly, keep this Man on and Give him a raise he deserves it , He is a Hard worker.”
Service Experts Heating & Air Conditioning
“I've generally been skeptical of HVAC companies because I don't know enough about how the systems work to know when I am being tricked into purchasing products or services I do not actually need.”
McAdams Plumbing
“This is the first time we have used them and the service personnel showed up on time, we're very courteous and had our issues solved and repaired in a remarkably reasonable time frame.”
High 5 Plumbing
“I love getting a heads up on when the team will arrive and always feel confident that the work will be done well, that I know my options and that I'm getting exactly what I need done.”
Mile High Radon Control
“I called to inquire about the cost of a service call and the guy took the time to talk through my system, asked for me to send over some pictures, and ultimately told me that it looked fine and I didn't need any work done on it.”
M and M Heating
“M&M has it all, from office staff to Technicians across all aspects, cooling / Heating / plumbing / electrical, had one of their technicians out today, had same tech prior and always professional, explained what was expected to be done, what was done...”
Elevation Plumbing & Heating
“They were more affordable than other quotes we got, got the job done quickly and efficiently, courteously worked around our class times and customers to make sure they weren't interrupting our business, and even vacuumed up after (wasn't expecting th...”
Tri Town Plumbing & Heating
“Timely, professional and incredibly helpful technician helped diagnose our unit and went over the top in making sure it was in safe and working order before he left.”
Daniel & Donna Plumbing Service
“Daniel and sons, Nick and Daniel, arrived on-time, provided a detailed scope of work with pricing, communicated challenges, provided options and choices - all with a smile and positive vibe.”
Tyco Plumbing
“When Robert came out I was expecting just estimate, but he not only replaced water heater he fixed some shutoff valves making it much easier to shut off water to the water heater and the house.”
Bliss Water Heater & Boiler Repair Service
“Paul was super reactive when I first contacted him and within 5 days he was in our house putting in a brand new water heater for 10% cheaper than the same product from his corporate counterparts.”
Jim Needham Heating Cooling Plumbing and Drain
“He took the time to answer some questions I had, and made me comfortable enough to know that I will be using this company's services again, and will ask for Tyson in particular.”
Hankel's Drain Cleaning
“The 4th company I called was Hankel's, and Bryan came just hours after I called him to unclog our basement floor drain, which had overflowed and couldn't handle any additional water from the washing machine, dishwasher, etc.”
Triple S Sanitary Sewer Services LLC
“In fact, after a large day-long job, the city inspector who came to examine the piping, checked everything off his list and said to me, “I never have to worry about Triple S, they always use the best parts and have the cleanest joints.”
Why these companies made our list
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