Licensed Well and Septic Contractors: Boulder County, CO

64 licensed well and septic pros based in Boulder 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 Boulder County Public Health - OWTS Licensed Professionals, Weld County Department of Public Health & Environment, Colorado DWR - Licensed Drilling & Pump Installation Contractors, Jefferson County Public Health - List of Licensed OWTS Contractors, El Paso County Public Health - Onsite Wastewater Treatment Systems (OWTS), Arapahoe County Public Health - OWTS Licensed Installers & Cleaners/Pumpers and Larimer County Department of Health & Environment. Roster copy last refreshed 2026-08-19.

Towns in Boulder County

All 15 towns named on the license records based here, with the number of listings in each, most first.

License classes on the Boulder 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 64.

Septic Contractors based in Boulder County (53)

Water Well Contractors based in Boulder County (11)

Licensed by Boulder County

Boulder County issued these businesses' licenses, but the address on their license record is not in Boulder 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 Boulder County, with national cost ranges

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

None of the listings based in Boulder 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 Boulder 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