Local Since 2007: Family-owned and operated Front Range business.
Drain and Sewer Services in Longmont, CO
Mountain Valley Plumbing provides professional drain and sewer services in Longmont, CO, helping homeowners resolve clogged drains, sewer backups, tree root intrusion, and damaged sewer lines.
Local soil conditions, including expansive bentonite clay and shifting rocky glacial soils, place constant pressure on underground sewer laterals, leading to joint separation, pipe bellies, and recurring drainage problems, especially during Colorado’s wet spring season.
Our local team provides same-day service whenever possible to restore proper drainage quickly. Every job is completed by background-checked technicians backed by a 4.9-star customer rating and years of trusted plumbing experience across Northern Colorado.
Why Longmont Homeowners Trust Mountain Valley
What Causes Sewer Line and Drain Failures in Longmont?
Many drain and sewer problems in Longmont, CO begin with a combination of grease buildup and underground soil movement. Expansive bentonite clay swells and contracts as moisture levels change, while rocky glacial soils shift beneath the surface. Over time, this movement places pressure on buried sewer laterals, leading to pipe offsets, bellies, joint separation, and recurring drainage issues, especially during the wetter months of the year.
Common causes we identify during sewer inspections include:{
- Root intrusion from mature cottonwoods and willow trees seeking moisture.
- Decaying materials like old clay tile and cast iron in historic districts.
- Solidified grease and scale buildup in kitchen lines.
If you’re dealing with recurring backups or slow drains, a professional sewer camera inspection is the most accurate way to identify the underlying problem before recommending repairs. Our team can pinpoint the issue, explain your options, and restore proper flow with the right solution, not guesswork. Call (970) 317-2519 or request an estimate online.
Drain and Sewer Services We Handle in Longmont
Drain and sewer problems can range from minor clogs to damaged sewer lines requiring extensive repairs. Mountain Valley Plumbing provides complete drain and sewer services in Longmont, CO, from routine drain clearing and sewer cleaning to camera inspections, leak detection, and sewer repair solutions. Our goal is to identify the root cause of the problem and recommend the most effective long-term repair.
Our services include:
- Drain Clearing: Clearing everyday hair, soap, grease, and minor blockages to restore proper drainage throughout your home.
- Sewer Cleaning and Hydro Jetting: Removing stubborn tree roots, grease buildup, and hardened scale using professional hydro jetting when appropriate for your sewer line’s condition.
- Sewer Camera Inspection: Using advanced sewer cameras to locate pipe offsets, cracks, root intrusion, and other hidden issues before recommending repairs.
- Sewer Repair and Replacement: Providing traditional sewer repairs as well as trenchless solutions when your pipe’s condition makes them a suitable option.
- Leak Detection: Locating hidden water and sewer line leaks quickly to help prevent additional property damage.
Whether you’re looking for plumbing services in Longmont or exploring our complete drain and sewer service offerings, our team will help you find the right solution for your home. We focus on long-lasting repairs, not temporary fixes, and we’re happy to recommend the service that best fits your situation.

Safe Sewer Clearing Starts with Visual Diagnostics
The safest way to resolve recurring drain and sewer problems is to understand what’s happening inside the pipe before beginning any cleaning or repair. Because shifting soil throughout Northern Colorado can cause offsets, pipe bellies, and structural damage, we begin with a visual inspection whenever appropriate. This allows us to recommend the safest and most effective solution for your plumbing system.
Camera inspection: We use a high-resolution sewer camera to locate roots, grease buildup, cracks, offsets, and other hidden issues before beginning work.
Method selection: We choose the right equipment based on your pipe’s actual condition instead of using a one-size-fits-all approach.
Hydro-jetting: For pipes that are in good structural condition, high-pressure water scrubs walls clean to deliver a thorough clear that lasts longer than snaking.
Repair planning: If we find cracked clay or severe offsets, we avoid aggressive jetting and discuss safe repair options, including trenchless solutions.
Your home’s safety always comes first. That’s why every service is backed by our Safe Clean Home Guarantee. If we accidentally cause damage while working in your home, we’ll make it right and provide a $100 dinner as part of our guarantee. Schedule a sewer diagnostic online or call (970) 317-2519 to get started.
What Affects Sewer Repair Costs and Permits in Longmont?
Mountain Valley Plumbing provides upfront, flat-rate pricing, so you’ll know the cost before any repair work begins. A standard diagnostic fee applies to dispatch a technician and accurately evaluate the condition of your drain or sewer line.
The final cost depends on factors such as:
- Access to existing pipe cleanouts
- Total length of the pipe run
- Severity of the root or grease blockage
- Need for camera inspections
- Appropriateness of hydro-jetting
In most cases, Longmont homeowners are responsible for the private sewer lateral that runs from the home to the city’s main sewer connection, while the city maintains the public main line.
If repairs extend into the public right-of-way, additional permits and traffic control may be required. Our licensed technicians explain the permitting process and any local requirements before work begins.
Need professional drain and sewer services in Longmont, CO? Contact Mountain Valley Plumbing today to schedule service or speak with our team about your drainage concerns.
Longmont Drain and Sewer Frequently Asked Questions
Is the homeowner or the City responsible for sewer line repairs in Longmont?
Yes. We recommend performing a sewer camera inspection before hydro jetting whenever possible. The inspection confirms the condition of the pipe, identifies the exact blockage, and helps determine whether high-pressure cleaning is safe. This is especially important for older clay or tile sewer lines commonly found in historic Longmont neighborhoods.
Do you recommend a sewer camera inspection before hydro jetting?
We always recommend a camera inspection first. Older clay or tile pipes, common in historic areas like Old Town, are highly fragile. The camera visually confirms the pipe’s integrity and pinpoints the blockage, preventing us from running high-pressure equipment through a structurally compromised sewer line.
Hydro jetting vs. drain snaking: what is the difference?
Drain snaking is typically used to break through smaller clogs, while hydro jetting uses high-pressure water to clean the entire inside of the pipe by removing grease, sludge, and tree roots. Although hydro jetting provides a more thorough cleaning, it should only be used on sewer lines that are structurally sound. A camera inspection helps determine which method is the safest choice.
How much does drain or sewer cleaning cost in Longmont?
The cost of drain or sewer cleaning depends on factors such as the location of the blockage, pipe accessibility, the equipment required, and the condition of the sewer line. Mountain Valley Plumbing charges a standard diagnostic fee to dispatch a technician. After evaluating the problem on-site, we provide an upfront flat-rate quote before any work begins.
Do you offer trenchless sewer repair in Longmont?
Yes. We offer trenchless sewer repair options, including pipe lining and pipe bursting, when they are appropriate for the condition of your sewer line. After completing a camera inspection, we’ll recommend the repair method that provides the best long-term results. If permits are required because the line extends beneath a street or sidewalk, our team will manage that process as part of the project.
What Longmont neighborhoods do you serve?
Mountain Valley Plumbing proudly serves homeowners throughout Longmont and the surrounding St. Vrain Valley, including Old Town, Prospect New Town, Twin Peaks, Southmoor Park, and nearby neighborhoods. Visit our Longmont location page to learn more about our local service area.
Schedule Your Longmont Drain and Sewer Services Now!
Slow drains and sewer backups rarely improve on their own. Mountain Valley Plumbing provides trusted drain and sewer services in Longmont, CO, helping homeowners identify problems early and prevent more costly repairs. Contact our team today to schedule service and receive an upfront flat-rate quote.






