Mississippi Rideau Septic System Office

The Mississippi Rideau Septic System Office (MRSSO) is a partnership of the Mississippi Valley and Rideau Valley Conservation Authorities. The MRSSO administers Part 8 (sewage systems) of the Ontario Building Code on behalf of the Tay Valley Township.

The MRSSO is responsible for reviewing septic designs and plans, issuing Building Permits for new and replacement sewage systems and inspections for installations to ensure compliance with approvals. Before building or renovating your home or cottage, contact the OSSO for application information.


Eric Kohlsmith | Septic Inspector | Mississippi Rideau Septic System Office
10970 Highway 7 | Carleton Place | Ontario K7C 3P1
t. 613 253 0006 ext. 256 |

Contact Us

Rideau Valley Conservation Authority
3889 Rideau Valley Drive
Manotick, Ontario K4M 1A5

613-692-3571, 1-800-267-3504



Regular Hours: Monday to Friday, 8:30 a.m. to 4:30 p.m.

Member of: conservation ontario