If you need to dig a concrete for water then that's an issue.

In which if you have a legally existing multi-unit residence it is fine for it to remain; however, you could not add any more units to the existing building and therefore bring it "further out of compliance".I'd be happy to dig a bit deeper into it for you to verify based on the actual property address; however, unless your lot happens to already be designated with a diferent Zone (like RT-4) I would say this is unlikely without obtaining some form of Zoning Variation or Zoning Map Amendment.You can check the Zoning Designation & some other general information for your lot Here.

Huge help when you need to dig a little deeper into expenses.  

@Robert Shedden Just to dig a little deeper on your post..In the eyes of the law, I'm not sure that this guy is even considered to be your Tenant and you his Landlord at this point, as that relationship has not really been established other than verbal words exchanged.

If none of these thing s work I’d offer to let them out of their lease penalty free but I can’t let them dig a hole they may not climb out of.  

If you do a formal Subdivision, you will probably be required to dig a test well

Sometimes, you have to dig a little deeper and make assumptions.

One drawback is that every police agency does not report their stats here so you may need to dig a bit deeper, if you need more info.  

We have good postitive slope from the front to the back of the crawl space, so what we're planning to do is dig a small trench through the center of the crawl and install a french drain under the footer.Our grading around the property is good and the foundation is well sealed, so hopefully there won't be any additional water getting in.

I’m going to dig a little more to refresh my memory, that’s Deb S.