Think of mildew as "mold lite." They are both fungi, but mildew has shallower roots and is generally less problematic than mold.

Mold colonies thrive in damp, dark spaces where humidity levels are high. For instance, you might find mold under leaking ... How to Remove Mold and Mildew If you’ve already discovered mold ...

But there are plenty of mold and mildew ... house. However, the department does state that some legitimate reasons do exist for getting a test, such as rationalizing the expense of remediation ...