I recently bought a home with a septic tank. I have never had one before so I
am trying to learn all I can. A couple of weeks ago we had a very bad rain
storm and sewage from my septic tank backed up through my basement drain. It
was very expensive to clean so I plan to take measures to prevent it from
happening again. From discussions with a couple professionals, I believe the
cause was a stream of water running downhill through my yard over my tank
covers. Enough water entered to fill the tanks and forced water/sewage up
through my basement drain which sits lower than the tank lids. My thinking is
that with some waterproof caulk (or Flex Seal (TM) ) I could make the concrete
covers waterproof in case of another severe storm. I know this is where the
tanks are accessed for cleaning, but the seal could be broken with a utility
knife for this maintenance. Is there another risk I am not aware of to making
these covers waterproof (and probably air tight)? Thanks for any
advice/suggestions

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