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Septic Registry

Licensed septic companies in Washington County, Rhode Island

69 businesses on Rhode Island’s septic licensing records give Washington County as its address.

Licensed businesses based in Washington County

Who handles septic permits in Washington County

RIDEM licenses the people who design onsite wastewater systems and the soil evaluators who assess whether a site can take one. It licenses installers too, but publishes a list only for designers and soil evaluators — so this covers who you need before the digging, not who does it.

How to verify a septic licence before you hire →

Towns in Washington County

Where in the county each licensed business is based.

Licensed companies in neighbouring counties

A Rhode Island septic licence is valid statewide, so a company listed in an adjoining county can legally do the work in Washington County.

Records as published August 26, 2026. A licence can lapse at any time — confirm with RIDEM's OWTS professional licensing office before hiring. Report a correction.