Based on my own home personal tests it is but everyone's risk tolerance is different. My feeling is if I'm going to hyper-focus on anything it ought to be air way clearance top of list, including but not limited to, caution around shower water and for drinking, gardening with a mask, avoidance of conditions well documented that harbor difficult to eradicate bacteria including steam rooms and indoor pools. Of course, keep equipment clean and sterilized; it's possible with slow growing NTM daily sterilizing might be overkill.