You can always take them to small claims court.

You can take them to court and will probably get a judgment, but that doesn't mean you will get any money.

Maybe you can convince everyone involved to convert to a community owned system, with a shared maintenance agreement, reserve funds,Just need to find the smoothest path forward to needed upgrades like an above ground cistern, pumps, backup generator, better filters, or whatever to make the system function 100% of the time$1500 is minimal, spend it if that's the way forward.

They could use the search function and find the answer. 

You’ll get a court date in about 3 weeks.

Some courts allow a licensed property manager to act on behalf of the Owner, but only with a written management agreement and a license to manage property.

The likelihood of all of these occurring is low in a typical subject-to transaction. its why way back in our day we did these with wraps CA has a debt instrument called an All inclusive Deed of Trust it wraps the orginal mortgage it is a second in function my dad had a company called CA wrap back in the day and did hundreds of them.. its de ja vu all over again.. he did this during the Carter interest rate spikes just like sub too is now coming to light in a big way because of interest rate spikes.. 

And 3, they can accept your no offer of the test and take legal actions, you already stated you are “nervous” if the test were to come back positive, so even you know there’s potential chance of meth activities that have taken place on this property so you can have the situation be dealt with in the court of law.

I had to settle out of court because an injunction was placed against my house preventing the sale through another legitimate Agent.

Maybe bankruptcy, maybe slow courts or laws over Covid, maybe owner missed a payment and started paying again, but one payment behind, maybe trying to do a workout, maybe some environmental hazard with the property that they want to take ownership of it.So that would be the first step....find out who owns it.....individual or LLC or now in lender name.