Septic tank emptying should be done once a year. That's because we fill them up faster with water, chemicals and detergents from our washing machines, dishwashers and baths. This stops the bacteria that digest sewage from doing their job, so solids build up more quickly in septic tanks and treatment plants. If left uncleared, this can lead to unseen damage that may be difficult, if not impossible, to put right. To stop this happening, you should have your septic tank or treatment plant emptied once a year and no less than every two.
Unfortunately, even the best-maintained septic tanks and treatment plants fail and need replacing. Growing tree roots, old brickwork and shifting ground, for instance, can all cause irreparable damage to soakaways and pipework. If you move to an old or neglected rural property, you may have no choice but to fit a new system just to cope with modern life. In the past, people could go years without emptying their septic tanks. You can't do that anymore. That's because we now fill them up so fast with water from baths, washing machines and dishwashers.
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