This is critical that you have a third party evaluate and charge you for the remedy, so you can bring receipts and witnesses to the odor to court.

Hi Fellow investors, I am evaluating a property that has a septic tank + own water well.

I have one friend, who invested in construction excavators for 10 years, he put all his cash and family cash in excavator during this period, he was gaining big ROI around 30%.Unfortunately, after this period finished, the excavators industry collapsed during the last 5 years till this, and his asset now evaluated by 80% less, because there is a lack of demand and huge supply.This could happen to any sector/asset, any assets have a good time and bad time, real estate, fortunately,it is less volatile/risky than construction service, but that does not mean it is risk-free, this is why economists support diversify in different sectors. 

The comps were evaluated in that instance as well.

Be sure to evaluate potential environmental issues.

After evaluating deals and having a shortlist of 3-5 that could potentially work.  

In the past, one of the tenants got wood from the property (1.5 acres) and put a log in each day during the winter in North Carolina.

At this point when evaluating deals I am much more likely to jump in in a deal that has fixed rate debt, even if it's in the 5% range, simply because I can see how the underwriting is affected and how this plays out.  

At those lower prices you also have to really evaluate deferred maintenance.  

Not that it will solve all your problems with this tenant, but a logging thermometer will supply you proof that the system is working if she starts calling the local housing authorities.