Why manholes get ignored
They're flush with pavement, they're heavy to open, they don't visibly overflow — and unlike a curb inlet, nobody photographs them for the board packet. So they sit. On the Broward and Miami-Dade properties we service, we regularly open manholes that haven't been touched since the original build. Twenty years of sediment builds a shelf inside the structure that constricts flow between the incoming and outgoing pipes.
Four signals it's time
- Upstream basin drains slow even after cleaning — the manhole downstream is the choke point.
- Visible sediment fan at the outfall — material is moving through the manhole and out, meaning it's already routed past the sump.
- Frame or lid is settling — the corbel is deteriorating and debris is falling in from above.
- 5-year recertification is coming — engineers pop manholes as a matter of course; a pre-clean saves a corrective callback.
What a manhole clean actually looks like
Traffic-safe setup (cones, arrow board on active drives), lid pulled with a hook, confined-space protocol if entry is needed, vactor removes accumulated sediment from the invert, walls hand-scraped if needed, and a CCTV drop to verify pipe conditions upstream and downstream. Documented with pre/post photos and a footage report you can file. Roughly 30–60 minutes per structure at the shallow end; complex or deep structures take longer.
Three signals it's not a cleaning job
Cracked corbel with exposed rebar. Missing benching or a collapsed invert. Root intrusion at a joint that's actively displacing pipe alignment. These need a repair or replacement scope from a licensed contractor, not a cleaning crew — though the vactor still shows up first to give the engineer a clean picture to inspect.
Cost anchor
Manhole cleaning runs similar to a mid-size catch basin — figure $150–$400 per structure at commercial cadence, less when bundled with a full-site clean. Full details on our manhole cleaning service page and the cost guide. Recertification-driven work fits under 5-year drainage recertification.
