What could be the necessary procedure / steps for trial run of a Drinking Water Treatment Plant, just before commissioing the same into service?...

What could be the necessary procedure / steps for trial run of a Drinking Water Treatment Plant, just before commissioing the same into service? Is there any such SoP to guide this approach and also monitorig of the regular functioning of the Plant?  Thaks and Regards. Nripendra Kumar Sarma Assam, India