I Just Took Over This Property. Am I Responsible for a Stormwater System I Didn't Know Was Here?

Short answer: yes, usually.

Stormwater responsibility transfers with the property. If an SCM was permitted years before you took over, that obligation doesn’t disappear. It’s now yours to maintain and report on. This catches new property managers off guard more than almost anything else we see.

First step: find out what’s actually on your site and when it was last inspected.