Can Heavy Rain Overflow a Septic System?

Question Asked by uncoyly: can heavy rain overflow a septic system?
I recently dug up the access lids to my septic system to have it pumped. Before I could fill in the 24″ deep holes, we had two days of heavy rain and I’m concerned that a lot of rainwater is getting into the tank. Is this anything to be concerned about? Will the additional water simply flow out into the leach field, or will the tank backup if too much rain gets in?

Best answer:

Answer by E. F. Hutton
The way the system works is the tank collects the solids, bacteria break them down, and liquids then move into the field. Sludge of material bacteria can’t process builds on the bottom and needs to be removed only occasionally. The tank will basically always be full. Rain flowing in the hole won’t matter a bit. As long as the system is of appropriate size for the home and functioning properly it should never back up. The key there is functioning properly. If you’re having to have it pumped it probably isn’t working as it should. Are the field lines easily visible? Marshy areas in the lawn? If so the system needs help. I recommend Septic Helper 2000. Watch what goes down the drain. Lots of bleach for example kills the septic system.

Answer by powerleg5
He is absolutely correct in the explanation of the septic system. When E.F. Hutton talks, people listen.

Answer by BN
First what type of septic do you have and did you replace the lid after pumping. Septic tanks are usually made of a sealed concrete box or round tank. Rain should not be able to get into the tank. The take should not have an opening even when dug up and exposed for water to get in. If water is getting in have your city septic tank inspector come take a look they should do this for free. You should only have to pump your tank every 3 to 5 years. There could be a hole in a pipe or the septic could have a crack if so it really needs to be look at and possibly replaced or fixed.

Answer by Iantha
…otherwise there’s be no way for the water to runoff. Let’s face it after so many flushes, showers, etc the tank is gonna fill and overflow. The main concern with a septic tank is solid waste not liquid. So having rainwater in it shouldn’t effect the system.

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