You may need a sump pump to remove ground water.

Roofing damage is often visible from the ground. Water

Bands on fracking, and limiting ground water usage would be a big hit, so I don't rule anything out.  

REC's are defined as:· "The presence or likely presence of any hazardous substances or petroleum products on the property (Site) under conditions that indicate an existing release, a past release, or a material threat of a release of any hazardous substances or petroleum products into structures on the property (Site) or into the ground, groundwater, or surface water of the property.

Asphalt shingles leach material during rain storms, and can leach material not great for ground water. 

You're not talking about a basement drainage sump pump from groundwater. 2.

There is an extraordinarily obvious crack, several feet long, that goes all the way through the slab, which is perfect for letting ground water rise up into the apartment.

On the other hand my neighbor is still perking the soil and groundwater 3 years later.

That's just one example of why you must identify the source of the water.If your problem is high ground water (rare in the West ), then really truly the correct solution is an EXTERIOR French Drain.

Should I pay to have the soil & groundwater tested or am I going down a rabbit hole?!