Even worse, what if your well becomes contaminated?

You have to bring suit to find out.For those that recall the environmental contamination days banks or lenders faced, they didn't want to touch the collateral until after the laws changed relieving them of clean-up obligations.

The city is passing out water filters, free water and other services to make sure people do not have to drink contaminated water.

California is yet to update it's meth clean up page, but it does seem to contain a contamination level of 1.5 micrograms per 100 square centimeters as a standard for presumably the max amount of residual methamphetamine.https://www.dtsc.ca.gov/SiteCleanup/ERP/Clan_Labs....For cleanup, there are lots of other state sites, e.g.

We have a mobile home park under contract in North Carolina and are seeking referrals to an environmental attorney who can help us assess the risk associated with acquiring a park with a contaminated water well. 

The paperwork has to report any contamination if any.

Or worse, doesn't burn down the building and just leaves it with meth contamination, costing OP many thousands of dollars to remediate? 

The stuff gets into the paint and everything else and contaminates the entire environment.

The well could run dry (rare in my area) or the pump could fail. ...There is at least one more thing: groundwater contamination.

All carpets are contaminated and they need to be changed and condo painted While all the work is done I should put her up at my costs in a hotel somewhere .At the end of all this he says it's just cheaper to buy them out .