The southwest region includes the economic regions of london, windsor-sarnia and stratford-bruce peninsula as defined by statistics canada, including the cmas of london and windsor cities include chatham, ingersoll, sarnia, stratford, goderich and owen sound. Are you a customer or the owner/manager of the business you’d like to add? We consider the following to be plumbing emergencies. How can plumbing problems be mitigated? When wastewater is unable.