Yes. The house was built in 53 that was their solution to the high cost of sewage treatment.

Disconnect the sink drain and route it to the sanitary sewer. You will probably also need to install a connection to the vent stack, or add a separate vent that goes through the roof.

Why would I do that? It has worked this way for 66 years (it started last year) Something has changed. The big question is what.

" Why would I do that?"

Because you are dumping sewage into a Storm Drain.

Getting away with an unhealthy and illegal pollution is not an excuse for an ethical person to be a terrible neighbor.

The fact that you even asked is quite telling!

Every house in the neighborhood has the exact same set-up. it is what the village wanted when the neighborhood was built. it is not illegal, it was code at the time of building. Completely redoing all the pluming in the house is not the solution to the issue. so thank you for the advice, but I'll figure out what changed to make this start instead of ripping my entire house apart.

The old "everybody's doing it" and "it has always been this way" defenses. lol

Legally dumping raw sewage currently into storm drains is very unlikely... and if so, the risk to public health seems to be of no concern in your little burg.

What town or city are you in? (I'll hold my breath waiting for your answer. lol)

Water from sinks and similar is considered to be gray water, not "raw sewage".

https://en.wikipedia.org/wiki/Greywater

Seems like in the US there are variations as to requirements across states, as usual. So what's valid in some areas aren't in others.

My read is the OP can do whatever's required to solve this current problem, but if there was any work being done that required permits, and current code didn't permit this use of gray water, then it'd have to be reworked then.

Getting back to the original question, my vote's on venting too.

Greywater isn't raw sewage. That's called blackwater.

But that doesn't mean it's necessarily harmless to dispose of it into storm drains or surface runoff. Harmless or not, often city and county laws regulate it.

Case in point: in my area, legislation (not building code) requires that if you have a septic tank, your sump pump has to discharge into the septic tank.

From what I understand, the reason is that for decades, homeowners dumped their laundry discharge into their sumps, then pumped it out into the storm drain ditches.

When you sell your house here, the health department says you can't have a sump pump discharging anywhere but the septic tank, even if your washing machine drain is separately plumbed to the septic tank.

I understand that you're trying to get back to what you had before, and it's your choice, but sometimes the easier and better answer is to just go ahead and update to more modern standards.

This guy won't do the right thing!