I bought a house, seller didn't disclose plumbing issue in garage, I need to know what to do about it.?

The garage has a sink and urnal in it. It looks like they are hooked up to the public sewer system. I had a home inspection and they did not see it was messed up and previous owners failed to mention this. I found out later that it drains into a big pit in the ground. I think this is illegal and one question on... show more The garage has a sink and urnal in it. It looks like they are hooked up to the public sewer system. I had a home inspection and they did not see it was messed up and previous owners failed to mention this. I found out later that it drains into a big pit in the ground. I think this is illegal and one question on disclosure asks if anything is illegal on the property. I dont have a lot of money to higher a lawyer. But want to make them fix it. What should I do? Part of the reason I bought the house was to turn this space into my art studio. I need proper drainage for the sink. I got a plumbing estimate and its over 3,000 to fix. Does anyone have any advice? I live in PA.
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