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My house is over 20 years old - how do I know if my Septic Tank is working effectively?

Septic tanks prior to the 1990's may not be built to current standards and performance should be checked. You should check tank structure, provide access points for maintenance and de-sludging, replace soak-pits and pipes to drains (if present) with a properly designed percolation area exclude roof and yard water from the system. Consult a trained specialist in the area of domestic systems if necessary or in doubt.