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Brian Reed gravatar image

The fact that the discharge is clear is a good sign - then the septic tank is removing the solids. However the fact it is clear may mean it’s not coming from the tank or there is a sand filter polishing it to remove solids. I’m assuming the foul smell is “rotten eggs” - again a sign it is working.

It should be desludged as others have said, but check it has been properly built as sometimes septic tanks are constructed without a base. DO NOT ENTER THE TANK - IT’S VERY DANGEROUS.

As it is close to the river, a septic tank followed by a soak away may not be sufficient even if working properly. A constructed wetland can provide another treatment stage - a shallow basin filled with granular material planted with local wetland plants. Keeping the effluent level below the surface should help limit mosquito breeding.

Also check it is only receiving dirty wastewater. Rainwater can go straight to the environment so as not to overload the tank.