If your sewer pipe exits the house above the floor line and you have fixtures in the basement then you have a ejector pump. Regards, Tom

Could the sump pump be involved? Your thoughts? Tom

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Originally Posted by hkstroud

Yes, would be a pit in basement floor. Sewage would drain into it and then would be pumped back up to sewage line going out of the house to the street sewage line. If you stand next to it, you should hear the pump come on when a significient amount of water drains into it.

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OK, I know I have a sump pump, but will look today and see if I have a sewage pump.

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Originally Posted by speedball1

Could the sump pump be involved? Your thoughts? Tom

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Meaning, making the noise? No, definitely not coming from the sump pump. Not sure if you meant something else though.

Just for your information. Sewage pump will look like sump pump but will have more pipes.

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Originally Posted by hkstroud

Just for your information. Sewage pump will look like sump pump but will have more pipes.

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Yes, that does help, thank you!

One more time!

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If your sewer pipe exits the house above the floor line and you have fixtures in the basement then you have a ejector pump.

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Don you have such a pump? Back to you, Tom

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Originally Posted by speedball1

One more time! Don you have such a pump? Back to you, Tom

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It do not believe I have one. I only have a sump pump, and believe my main sewer line is in the basement.

And is there water in the pit? Is this a operating sump pump? Let me know, Tom

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Originally Posted by speedball1

And is there water in the pit? Is this a operating sump pump? Let me know, Tom

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Yes, it is operating.

Could it be a "banging" that you hear? If so it could be the check valve c losing. Your thoughts? Tom

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Originally Posted by speedball1

Could it be a "banging" that you hear? If so it could be the check valve c losing. Your thoughts? Tom

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OK, if that is the case I would be able to hear the knocking standing next to the sump pump? I thought the sump pump was for ground water, not drain water from the plumbing pipes? Please advise and Thank you.

Sump pumps are ,indeed, for ground water. I'm just exploring possibilities. How about an PRV (pressure reducing valve, (see image) do you have one of those next to where the water enters your house? Let me know, Tom

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Originally Posted by speedball1

Sump pumps are ,indeed, for ground water. I'm just exploring possibilities. How about an PRV (pressure reducing valve, (see image) do you have one of those next to where the water enters your house? Let me know, Tom

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Yes I do

Next time you hear the knocking c heck out the PRV valve and let me know what you find . Tom

No knocking at PRV valve, no knocking coming from the basement area at all.

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Originally Posted by Shagrl247

No knocking at PRV valve, no knocking coming from the basement area at all.

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Then where's it coming from? Back to you, Tom

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Originally Posted by speedball1

Then where's it coming from? Back to you, Tom

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The sound is coming from the middle of the house (2nd of 3 floors).