Larimer County storm drains are not dumping places

The grate at the curb looks a lot like a sink, but it works nothing like one. In the built-up parts of Larimer County, storm drains and roadside drainage carry runoff toward creeks and the river, and nothing in between filters or treats it along the way.

That is the whole point of the county’s stormwater quality program, which runs under a municipal storm sewer permit. The rule behind it is short: only stormwater should go into the storm system unless an allowed exception applies. Wash water, chemicals, sediment, yard waste, or other material poured into a drain does not disappear; it rides the same channel to the same waterway, which is how a single drain becomes a water-quality problem downstream.

The honest trouble is that the offending acts rarely feel like dumping. Washing tools in the driveway, draining a pool to the gutter, rinsing a paintbrush, or letting muddy water run off a job site all seem like minor, ordinary chores. The catch is simply that the water has somewhere to go, and that somewhere is a stream.

So the safe habit is to picture where the gutter leads before sending anything down it. Dirty water belongs in a sink or a sanitary drain, not the storm system, and the county’s stormwater quality page lays out the few exceptions if you are unsure. When in doubt, keep it out and ask.