I told him he needs to keep pets off the lawn for an hour after the gardener comes for the first time, and he asked if they would be spraying "toxic chemicals." 

You can find out the amount of water used by taking pool measurement and checking on line,, they'll have the info because this is used to calculate chemicals needed to maintain the pool.Was the well disclosed on your purchase of the property,, If it's listed and now in your name then your the sole owner..

(includes testing, chemicals).

They skip the worst days - my guy says anytime temps are below 32 for 24+ hours - but otherwise they use some chemicals in it and cover it.

chemical applications are really cheap maintenance if applied correctly.Renters wont take care of your place like you do.

Inspector suggested non repellent liquid chemical around foundation which is less expensive.  

and i know there are treatment options where holes are drilled around the home and chemical is placed down below...im in philadelphia. 

you can use a heat treatment but the best seems to be a ultraviolet light disinfectorit kills everything and that way you are not using chemicals or have any missesthese units you can rent they are not cheap but it does the job and it saves you from the exterminator feesthey are called true d uvthey use them in health care and hospitalsenjoy

I also counsel them to show compassion for people with chemical dependencies, even if you disagree with them and think they are a big fat pig.

I'm not a meth expert, so I don't know if the chemicals used are technically considered "environment contaminants," but that might require a "yes" answer.Most disclosures will ask something along the lines of, "Do you know of any other adverse conditions of the property that haven't been addressed in the rest of this document?"