Here is the bottom line. You asked for a flap. Many posts told of a flap. It is called a backwater valve. Now your choice is simple... backwater valve accessible in pit inside home with cover [about 18" square] or risk bacteria from 'raw sewage' by way of physical contact or inhalation thereof. I think they call it hepatitis.

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Originally Posted by JeremiahJ

i
labman...we've lived in the house for almost a year, i

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It may be too late to stick the seller with the bill for doing it right. I think I mentioned the real estate law forum here.

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Originally Posted by JeremiahJ

we have an issue with the city's sewer system in which when it rains (pours, hard) water will come back into the house from out back. the clean out "flap" will close outside but it's never air tight, thus allowing some water back in. the only place it comes in is under our toilet in the basement...is there some sort of trap or hinge to put over the flange...almost like the toilets in rv's that won't permit water to come up, only go down? thanks in advance.

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Everyone's help is appreciated... would this be a solution to look into more?
Clean Check Extendable Backwater Valves

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Originally Posted by JeremiahJ

we have an issue with the city's sewer system in which when it rains (pours, hard) water will come back into the house from out back. the clean out "flap" will close outside but it's never air tight, thus allowing some water back in. the only place it comes in is under our toilet in the basement...is there some sort of trap or hinge to put over the flange...almost like the toilets in rv's that won't permit water to come up, only go down? thanks in advance.

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Is that a city backflow check valve or yours? Can not imagine that the city will let this happen. The health department will take issue with the problem in most areas. Nm

I'm under the assumption that it was a city job... is there a way to know for sure? It was done before we moved in but it must have been recent because grass hadn't been planted where it was dug up so it was still bare from the digging

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Originally Posted by JeremiahJ

i'm under the assumption that it was a city job...is there a way to know for sure? it was done before we moved in but it must have been recent because grass hadn't been planted where it was dug up so it was still bare from the digging

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The health department may be a part of the building department, so start there and check the city permit buyoff for your house to see if they are liable. There should have been a real estate disclosure when the house was sold to you. They are also liable. I am not a lawyer but I was in construction for a long time to know some of the problems.

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Originally Posted by nmwirez

check the city permit buyoff

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Not exactly sure what this means...

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Originally Posted by JeremiahJ

not exactly sure what this means...

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That is when the new construction was signed off as accepted by the inspector when the final was made on the building. The plumbing is part of that inspection. This also carries over to any inspected remodel work that was done by you or previous owners. If there is no record to that effect then someone else bootlegged the work and the problem came about from that job. (I.e. The toilet could have been put in after the original buyoff.)