Contractor profiles
- C.F. Crozier & Associates Inc.
- C.O. Construction Ltd.
- C&H Pumping
- Caledon Excavation & Grading
- Call of the Wild Inc.
- Call Of The Wild Sanitation
- Cambium Inc.
- Campbell Septic Services
- Campbell's Garage and Sanitation
- Camping In Ontario/OPCA
- Canadian Drain Plumbing
- Canadian Sanitation
- Canadian Sanitation Inc.
- Canadian Shield Consultants
- Carleton Environmental Services
- Casselman Cement Ltd.
- Castle Sanitation
- Cedarwood Contracting & Excavation
- Central Sanitation
- Centre for Advancement of Water and Wastewater Technologies, Fleming College
- Charles Morden Construction
- Chrétien Excavation Inc. – Sylvain Chrétien
- Claramy Designs Incorporated O/A LSK Septic and Drain
- Clarington Septic Repair
- Clear Line Site Solutions
- ClearFlow Inc.
- Clearford Water Systems
- Clearlite Excavating
- Cliftondale Construction Co.
- Clover Luxury Portables
- CMT Engineering Inc.
- Coalwater Excavation Inc. – Carl Charbonneau
- Cobide Engineering Inc.
- Coiron Ottawa Excavating
- Colron Excavating
- Colron Ottawa Excavating – Paul Saffioti or Jordan Walker
- Compass Resorts
- Concrete Precasters Association of Ontario
- Coon’s Cartage & Excavation – Maynard Coons
- Cooney Construction & Landscaping Ltd.