I had my water tested recently at Special Pathogens Laboratory in Pittsburgh. Several water samples were negative but one came back with a lot of Mycobacteria, some of which they thought were Gordonae( from the shape and color of the culture colony) which is not usually pathogenic, although noticed another post about a member being infected with this
The lab will only tell you whether the mycobacteria are present or not. I am waiting to hear my final results on sputum culture testing - if it is something unusual, I might get the next level of testing to ID the bugs- the lab has to send it elsewhere for an extra charge
In the meantime, I am assuming that the water supply is generally contaminated and looking into putting water filters on one shower and the kitchen faucet. Pall Homecare provides filters that last about two months but this is a pricey option
Hope this information is helpful