Leak Detection & Repair
Hidden water stains, a climbing water bill and the sound of running water point here first.
24/7 Emergency Line Open
Plumber in Longmont, CO for Leaks, Clogs and No Hot Water
When water is running where it should not, or a drain has stopped, a plumber serving your area can be dispatched at any hour. Call the line below, describe what you see, and the dispatcher will sort out who can come.
- Licensed and insured plumbers
- Same-day service when available
- 24/7 emergency dispatch
Start here
Water is running where it should not: do this first
A burst supply line or a failed tank can put a lot of water on the floor in a short time. Spend the first few minutes limiting the damage, then make the call.
- Shut off the main water valve. It is usually where the supply line enters the house, often in a basement, utility room or garage.
- Switch off the water heater if it is leaking, and cut power to any wet outlet only if you can reach the panel without standing in water.
- Move rugs, boxes and electronics out of the wet area, and photograph the damage before you start cleaning up.
- Call the dispatch line and tell them where the water is coming from and whether it has stopped.
Smell gas? Leave the building, then call from outside. Do not touch switches, lighters or appliances, and do not wait for a plumber before you leave.
Burst pipe or backed-up drain right now?
The dispatch line is open around the clock, including weekends and holidays. Call and the dispatcher will confirm what is closest to you.
Plumbing services
Fifteen kinds of plumbing work, one phone number
Residential plumbing in Longmont runs from a single dripping fixture to a whole-house repipe. Each service below has its own page with the signs to look for, what the work involves and when to call right away.
Slab Leak Detection & Repair
A warm or damp spot on a concrete floor means the pipe under it needs locating before anything is opened.
Drain Cleaning & Clogs
Slow sinks, gurgling lines and repeat clogs, from a single fixture to the main drain.
Sewer Line Repair & Replacement
Backups, sewage smells and tree-root trouble in the line between the house and the city main.
Water Heater Repair
No hot water, lukewarm water or odd noises from a tank that may still be worth keeping.
Water Heater Installation & Replacement
When a tank is leaking or past repair, this covers choosing, installing and permitting its successor.
Tankless Water Heater
On-demand hot water, gas and venting questions, and what a switch from a tank involves.
Repiping & Pipe Repair
Repeated pipe leaks and failing supply lines, and when replacing them beats patching them.
Water Line Repair & Replacement
The supply line from the meter to the house, and signs that it has sprung a leak.
Gas Line Installation & Repair
Gas piping for ranges, dryers, heaters and grills, with safety steps for any gas smell.
Faucet, Toilet & Fixture Repair
Drips, running toilets and weak flow at the fixtures you use every day.
Garbage Disposal
A disposal that hums, jams, leaks or smells, and when a replacement makes more sense.
Water Damage Restoration
Water removal and drying after a pipe failure or flood, so wet materials do not sit.
Water Softener & Filtration
Filtration and softening questions, read against what the city says about local water.
Commercial Plumbing
Restaurants, offices and multifamily buildings, where grease traps and code work come into play.
Local facts that change the call
What Longmont homeowners should know before they hire anyone
The sewer service line is yours
According to the city's sewer guidance, the line from the house to the main in the street belongs to the property owner, and the city looks after the main. The practical result: when one drain is slow, the trouble is usually inside the house, and when several fixtures back up together, the service line becomes the likely suspect.
The city also says it inspects mains and may notify owners when roots from a service line are involved. A line that clogs again and again is worth a camera look through sewer line repair and replacement rather than another round of snaking.
Water heater swaps need a city permit
Water heaters appear on the list of work that needs a permit from Longmont Building Services, at 385 Kimbark Street, phone 303-651-8332. If a tank has failed, ask about the permit before the old unit comes out. The steps are laid out on the water heater installation and replacement page.
Longmont water is soft, so skip the guesswork on softeners
The city's 2025 water quality report lists total hardness between 19 and 25 parts per million, which works out to roughly 1 to 2 grains per gallon, and states that a water softener is not recommended. If a salesperson quotes a much higher number for your address, compare it with the utility report first. Filtration for taste or sediment is a separate question, covered under water softener and filtration.
Who owns which part of a sewer problem
Knowing where the city's responsibility ends saves a wasted call, and it is a useful question when comparing plumbing companies in Longmont. This summary follows the City of Longmont's sewer line guidance.
| Pipe | Where it runs | Who maintains it |
|---|---|---|
| Sewer main | Under the street or alley | City of Longmont |
| Sewer service line | From the house to the main | Property owner |
| Fixture drains and branch lines | Inside the house | Property owner |
Per the same city guidance, drains that are only sluggish or backing up while water is running point toward the service line. Commercial owners are told to maintain their own grease interceptors and sand traps.
Not sure which service you need?
Describe the symptom to the dispatcher. If the problem needs a different kind of plumbing work than you expected, you will hear that on the phone before anyone is sent.
Match the symptom to the service
| What you notice | Likely problem | Where to read more |
|---|---|---|
| Water bill rising with nothing left running | A hidden supply or fixture leak | Leak detection |
| Warm spot on a concrete floor | Hot line leaking under the slab | Slab leak work |
| Several drains slow or gurgling together | Main drain or service line blockage | Drain cleaning |
| Sewage smell or backup in the lowest drain | Damaged or root-filled service line | Sewer line repair |
| Lukewarm water or a puddle by the tank | Failing heating element, valve or tank | Water heater repair |
| Pinhole leaks in more than one spot | Aging supply pipes | Repiping |
| Wet lawn between the meter and the house | Leak in the buried water line | Water line repair |
| Wet carpet or drywall after a failure | Water that has to be removed and dried | Water damage restoration |
Irrigation and sprinkler systems are a separate trade, so a failed lawn system is a job for an irrigation contractor.
How a call works
What happens after you dial
- A dispatcher answers and asks what you see, where the water or gas concern is, and the address.
- You get a plain read on whether it is an emergency or can wait for a scheduled visit.
- A plumber serving your area is sent when one is available, and same-day visits are offered when the schedule allows.
- Once on site, the plumber diagnoses the problem and talks through the repair.
Calls to this number may be recorded, as noted on the privacy page.
Business owners can use the same line. Commercial plumbing covers restaurants, offices and multifamily buildings, including grease interceptor upkeep.
Where dispatch reaches
Plumbing help across Longmont and the towns around it
Dispatch covers Longmont and the Front Range towns around it. These are the ZIP codes served by this dispatch network:
- 80501
- 80502
- 80503
- 80504
Not sure your address is covered? Call, and the dispatcher will confirm it for you.
Quick answers before you call
Can I get a plumber at night or on a holiday?
Yes. The dispatch line stays open around the clock, every day of the year. Nights, weekends and holidays go through the same number, and the dispatcher will tell you what is available for your address.
What counts as a plumbing emergency?
Water that will not stop, a sewage backup, no water at all, a leaking water heater and any gas smell all qualify. A dripping faucet or a slow tub can usually wait for a scheduled visit.
Where is my main water shutoff?
Look where the water line enters the house: a basement wall, a utility closet, a garage or beside the water heater. It is a round wheel or a lever handle. Turn the wheel clockwise or turn the lever a quarter turn across the pipe.
Do you work outside Longmont?
Yes. Boulder, Broomfield, Louisville, Lafayette, Erie, Frederick, Mead, Johnstown, Platteville, Fort Lupton, Loveland and Jamestown all have their own pages, listed above.
Plumbing trouble does not wait for business hours
Call the 24/7 dispatch line and describe what is happening. A plumber serving your area will be sent as soon as one is available.
- Licensed and insured plumbers
- Same-day service when available
- 24/7 emergency dispatch