Looking for a slab leak plumber in Longmont, CO? Describe your project once and up to three licensed plumbers who work in Longmont and Boulder County get back to you with a quote. It's free and there is no obligation.
Longmont is home to about 99,818 people (2024 Census Bureau estimate), a stable community (+0.9% since 2020). With 3,411 people per sq mi, it is a suburban area. Many homes here are built on slabs, with copper or older lines running under the concrete.
Longmont at a glance
- Population (Census Bureau estimate, 2024)
- 99,818 (+0.9% since 2020)
- Rank in Colorado
- 13th of 271 cities and towns
- Land area
- 29 sq mi
- Population density
- 3,411 people per sq mi (suburban)
- Type
- City (Longmont city)
- Main county
- Boulder County
What to check before hiring in Longmont
- Test the meter: turn off every fixture and watch the meter.
- License: in Colorado, slab repairs are done by state-licensed plumbers.
- Insurance: call your insurer early and document the damage.
- Price drivers: detection, access, repair method and floor restoration.
Useful official resources
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EPA WaterSense: fix a leak
Official information and guidance.
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IAPMO
Official information and guidance.
Services available in Longmont
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Slab leak detection
Electronic and acoustic leak detection under a concrete slab.
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Slab leak repair or reroute
Spot repair through the slab or rerouting of the line through walls or attic.
Frequently asked questions in Longmont
How much does slab leak repair cost in Longmont, CO?
It depends on detection, access and the repair method. Describe your situation: plumbers who serve Longmont reply with a quote.
Is it an emergency?
Shut off the water if damage is spreading; many plumbers offer fast service.
How long does a reroute take?
Often one to a few days.
Which licensed plumbers will contact me?
Up to three independent licensed plumbers who serve Longmont and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.