If the bottom of the pile has organic matter or household chemicals or anything with moisture, it's most likely damaging the flooring and walls and attracting pests.

The house that has the well pressure tank also supplies the electric to the pump , if that tenant has their electric cut off , both buildings have no water . second , if there is a water treatment system that too is in the first house , who takes care of the chemicals.

The concrete was thinned with a chemical agent instead of hydraulic (water).

Greed can potentially lead to greater damage and have harsher lasting effects on oneself as well as to others.

Many locations have harsher regulations for building above 4 units.

So I want to preface this post with that fact that I am very nerdy (Chemical Engineering degree).

Sump pumps usually carry groundwater (clean) back out of the house - not dirty soapy chemical water.

Same thing with Chemical Bank up here they are slow and delay the process.

If the well is dry you are drilling deeper, if the well is not making water like it use to it could just be screen is clogged with minerals like iron or calcium and would need a chemical treatment to open the screen along.  

The TREC lease may be harsher than necessary and may envision you collecting more of a penalty than is realistic.