The toilet leakage is also not raw sewage, its leakage from the gap between the toilet bowl and the tank when the toilet flushes (because of high pressure flush).

I checked and didn't find any in-house water leakage.

Are all the bathtubs caulked, the pans checked for leakage? 

On the properties that I'm planning to sell for well-below market price, I'll leave the poly, verify that there are no leakage/rupture issues, and then put it in my disclosure so that the buyer will know before he puts in an offer that this is an issue.

No leakage that we can see.

They seem to have apartment complex "expense leakages" with SFR incomes.

Repair shop is going to cut the front end cowl from parts car, replace the other parts, find gas leakage problem and put it back together.

It looks nicer and is actually easier to install for a DIY'er without the worry of water leakage down the line. 

Check all the fittings you can get to for leakage and tightness. 

Tenants do not take adequate caution to avoid second floor water  leakage.