Best Radon Testing & Mitigation in Longueuil

About Radon in Longueuil, Quebec

Last updated: March 2026

Longueuil is served by C-NRPP certified radon professionals listed on RadonFinder.ca. Quebec's radon risk is concentrated in regions underlain by the Grenville geological province — including the Laurentians, Eastern Townships, the Outaouais, and parts of Mauricie — where uranium-bearing gneiss and granite produce elevated soil gas. The Montreal urban area, sitting on the St. Lawrence Lowlands, generally shows lower levels. Quebec has a high proportion of older housing stock in cities like Quebec City and Trois-Rivières, and older construction with block foundations and open sump pits tends to allow more radon entry.

Typical Mitigation Cost in Quebec

Near national average

Montreal-area labour rates apply in the urban corridor; rural and Laurentian regions may see higher costs due to contractor travel.

• •Foundation type — block, poured concrete, or stone foundations in older Quebec homes
• •Open sump pits and floor drains as radon entry points
• •Finished vs. unfinished basement — finishing adds pipe-routing complexity
• •Bilingual service availability in some rural areas
• •Age of home — pre-1980 homes often require more sealing work