Licensed Well and Septic Contractors: Larimer County, CO

169 licensed well and septic pros based in Larimer County. Every license number below is sourced from public licensing records, with a link to look it up yourself.

Grouped by the county of the address on each license record, which can be a mailing address, so it doesn't tell you where the business works. When the record names no county, we place it by ZIP code, then town.

Checked against Larimer County Department of Health & Environment, Weld County Department of Public Health & Environment, Boulder County Public Health - OWTS Licensed Professionals, Jefferson County Public Health - List of Licensed OWTS Contractors, Colorado DWR - Licensed Drilling & Pump Installation Contractors and Arapahoe County Public Health - OWTS Licensed Installers & Cleaners/Pumpers. Roster copy last refreshed 2026-08-19.

Towns in Larimer County

All 11 towns named on the license records based here, with the number of listings in each, most first.

License classes on the Larimer County records

Each class as the issuing agency prints it on the license record. A record that names more than one class counts once under each, so the rows can add up to more than 169.

Septic Contractors based in Larimer County (163)

Water Well Contractors based in Larimer County (6)

Licensed by Larimer County

Larimer County issued these businesses' licenses, but the address on their license record is not in Larimer County.

Own one of these businesses? Find your listing and claim it.

Looking for a specific contractor? Search by name, business name, or license number.

Services in Larimer County, with national cost ranges

Listings based in Larimer County whose license class covers each service. Cost ranges are national; each links its cost guide.

None of the listings based in Larimer County hold a license class we can match to septic tank pumping, septic system design or perc test and soil evaluation. Ask any contractor whether they do this work, or try a nearby city.

Hiring a well and septic professional in Larimer County

Before you sign anything: confirm the license on this page is still active with the agency that issued it, ask for proof of insurance, and get at least three written quotes; pricing on this work varies widely by site conditions.

Do I need a permit for well or septic work in Colorado?

Neighboring counties