Best Septic Tank Installers near Sainte-Thérèse, QC
These companies serve Sainte-Thérèse from nearby bases in towns including Sainte-Marthe-sur-le-Lac, Mirabel and Terrebonne.
10 companies listed · 2 open 24/7 · 4 open weekends · 6 rated 4.5+ · 3 show a licence
Data verified October 18, 2026
Excavation Genex
EVO Environnement
“I had a problem with a sump pump drain and before he even talked to me about taking it or anything, they took care of me on the phone and gave solutions that ultimately resolved my problem at no cost!”
Plomberie Bissonnette Inc.
“They took the time to carefully assess the situation, advise us and explain everything to us at each stage of the project.”
Sani-Fosse (2006) Inc
“He emptied our septic tank and took the time to explain to us what he was doing and gave us several tips to improve the functioning of the septic system.”
Septi-Plus Inc. Vidange de Fosse Septique
“Francis found time to come and help me out despite his busy schedule.”
The 10 companies listed for Sainte-Thérèse, QC design and install septic systems and replace failed leaching beds. Each company's own site is the source for its hours, licence claims and estimate policy. Ask who applies for the permit and who arranges the inspection before backfill.
Area overview: Sainte-Thérèse, QC
9 of the 10 companies on this page have a rating, from 3.7 to 5.0 across 150 reviews; 6 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (93%), quality (58%) and punctuality (51%). 2 are open around the clock; 4 are open on Saturdays and 3 on Sundays. 3 show a licence on their websites. Domain records put 2 websites of the companies on this page at ten or more years old; the oldest dates from 2003. 2 offer emergency call-outs. We have a website on file for 9 of the companies on this page; 9 publish a contact page and 8 list a public email. We count these figures across the companies on this page; hours and prices change, so confirm the details with the company before you book.
What should I look for on an installer's website?
9 of the 10 listings link a website. Look for photographs of real installations rather than stock images, the tank and treatment brands they work with, and whether design and soil work are in house. A company that only digs will subcontract the part that actually gets approved.
Lajeunesse Fosses Septiques
“Complete emptying of the septic tank at a competitive price, I recommend.”
Bernard Service Septique
“Appointment in the same week reasonable price”
Kelly La Solution Inc
“They gave us the confidence to revive our sewage field.”
Danny Morrow Excavation
Why these companies made our list
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