I wouldn't talk to the county agency unless you want them on alert to
go inspect your place and then end up with a several thousand dollar
mandatory repair.

I would instead talk to multiple contractors who deal with this kind of
stuff. Sure, there might be some crooked contractors wanting you to
spend money on them, but at least you will have a CHOICE, rather than
being forced to by the health department, EPA, etc. if they think there
might be a problem! And hopefully, if you talk to several contractors,
you should be able to tell who is honest and who isnt'.