Louisville's Public Works department runs the city sewer and its own treatment plant, while the drains in your home and the line to the city main are private. A plumber clears the private part and can tell you if the public side needs a call. Call the number on this page to be connected with a local plumber in Louisville.

What to expect when you call
Your call goes to an independent plumber who works in Louisville. The plumber will want to know which drains are slow, whether water has come up a floor drain or tub, and when the problem began. One slow sink usually means a hand auger and a short visit. A backup at the lowest drain in the house means the main line, which calls for a larger machine and often a cleanout. If your home was rebuilt recently, say so; new construction has different pipe than a house from decades ago.
What goes into the price
- The location of the clog: one fixture branch or the main line
- Access through an outdoor or basement cleanout
- Tools needed, from a small cable to a water jetter
- Camera inspection for repeat or unexplained clogs
- Repairs if roots, a sag or a break turn up
- Evening or weekend visits
Louisville's local picture
Louisville is a former coal-mining town in southeastern Boulder County, now a suburban community with a historic downtown along Main Street. The city owns its wastewater system, including a treatment plant built in 2017 that uses UV disinfection and discharges to Coal Creek; some of the treated water is reused to irrigate parks and a golf course.
For a sewer backup that may involve the city's mains, Louisville's Public Works Operations Division takes calls at (303) 335-4750 on weekdays from 7 a.m. to 3:30 p.m., and its on-call line is (303) 489-2301 after 3:30. If the clog is in your house or your private line, though, the city will point you to a plumber.
Housing in Louisville spans older homes near the historic downtown and many newer ones, including hundreds rebuilt after the December 2021 Marshall Fire. Rebuilt homes have new drain lines, so clogs there usually come from use, such as grease, wipes or construction debris, rather than old pipe. Older homes are more likely to have roots or scale in the line.
If a repair is needed, the city's Building Safety Division handles plumbing inspections.
Quick checklist before the visit
- Stop running water if more than one drain is backing up
- Clear space around the cleanout and the lowest drain
- Don't use chemical drain cleaners in standing water
- Note which fixtures failed first
- Have the city's backup numbers handy in case the main is involved
Drain Cleaning questions in Louisville
How can I tell if a clog is in my own line or in the public sewer main?
What does it mean when every fixture in the house drains slowly at once?
Why do I smell sewer gas from a floor drain or basement shower?
When is hydro jetting a better choice than a drain cable?
More plumbing services in Louisville
Drain Cleaning nearby
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