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William RiouxLicensed

Licensed septic contractor based in Clarksville, Coos County, NH

License details

License number	05339
License type	Septic System Installer
License status	Active, NH DES Designer/Installer roster
Based in	Clarksville, Coos County, New Hampshire 03592

"Based in" is the city and county of the address on the business's license record.

What this license covers

Installation / repair: licensed to build and install septic tanks and drainfields, and to repair or replace failed ones.

How to verify this license

We publish the license details exactly as they appear in the official licensing records of the agency that issued the license; we do not vouch for the business itself. Before hiring, look up license #05339 directly with the agency that issued it, confirm it is still active, and ask for a current certificate of insurance.

Source: NH DES - Septic System Designers & Installers, last checked 2026-08-16. Verify at the official source.

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See every listing based in Coos County or in Clarksville.