When is the piping, treatment or detention system considered plumbing?

* Foundation and subsurface drains are not considered plumbing. * The point where plumbing begins is where a foundation/subsurface drain discharges to a sewer, sump or drain tile receiver. * A culvert located entirely on the right-of-way is not plumbing. * Surface ponds are not considered plumbing * A grass filter strip, basin or other constructed component may be part of a plumbing system; much like a POWTS mound or sand filter, and these devices may serve as plumbing treatment devices. * Gutters and downspouts are not plumbing. Pipe conveying stormwater from gutters and downspouts are plumbing.  more