In order for a residential septic tank to continue functioning properly, it needs to be pumped on a regular basis. In fact, most septic tanks should be pumped at least once annually. Maintenance of your Calgary area septic tank is best left to a professional septic contractor. At High Country Vac Services, we want to make sure you are getting the best septic service anywhere in Calgary area! Here are the top questions to ask a septic contractor before hiring them for the job.