Holding Tanks
Some on-site systems are designed only to store wastewater, which is then pumped from the tank and trucked off-site for treatment. Often used where septic systems cannot be accommodated these holding tank systems depend on an alarm to warn when nearly full and usually require an on-going contract with a pumping service.

Aerobic Systems
Several mechanical alternatives to septic systems are available on the market.  These are active systems using compressors or motors to introduce air into the treatment of wastewater.  Most o these systems bubble air through wastewater or use rotating discs to expose the sewage to air.  By contrast, a septic system, unless it uses a pump to discharge to the leaching bed, has no moving parts and requires no electricity.


Aerobic systems can provide a higher level of treatment than standard septic tanks.  They also require lubrication, electrical connections and more frequent maintenance than conventional septics.  Some local Health Departments have been hesitant to approve these designs, because of problems that have arisen form improperly maintained systems; the same size drainage field may be required for an aerating system as for a standard septic system.

New Technology
These systems are improving as new technologies are further developed and demonstrated.  Research into improved mechanical systems, better biological treatment media and systems using wetland or aquatic plants appears very promising.  The University of Waterloo's Centre for Groundwater Research is one of the leaders in this area.

Call your Health Department for information on what kind of systems may be considered for approval in your area.