What does this oil-water separator annual checklist cover?

14 items across 4 sections, covering before the draw-down, media and internals, pump-out and records, refill and verification. Each item spells out what the person walking the job is actually looking for, not just a box to tick.

Who should run this inspection?

The plumbing service tech with the licensed pump-out hauler on the annual visit.

When in the schedule should this walk happen?

Once a year, coordinated with the pump-out so the tank is drawn down and the media can actually be pulled and looked at.

Why do these items ask for a photo?

7 of the 14 items call for photo evidence, 8 photos in all. A checklist answer without the photo is a claim; the photo is what makes the record worth something in a dispute and lets a reviewer approve work without re-walking the job.

What most often fails an oil-water separator annual inspection?

Tank pumped but the coalescing media left in place year after year, blinded solid, so oil and water pass straight through no longer separating. Pump-out done without a hauler manifest kept, so there's no record of volume or disposal when it's asked for. Sample or inspection port left silted over and never cleared, so future quarterly checks can't actually see the effluent.

Can I use this checklist in RTI?

Yes. Start a free RTI workspace, build this list as a checklist, and the Photo Gate holds the submit button until every mandatory item is answered and its photos are attached. Approved inspections roll into a branded turnover package with a tamper evident audit trail.

Free checklist

Oil-water separator annual maintenance checklist

The annual oil-water separator service is the deep pass: the measurements, cleanings and tests a quarterly round doesn't reach. This checklist keeps the full service on record with the photos that make it defensible later. Work is commonly verified against IPC / UPC plumbing codes, manufacturer's published instructions. Confirm the edition your authority having jurisdiction has adopted.

Start free with this checklist Download as PDF

The checklist

Every item, and the photo evidence it needs

The photo count on each row is what RTI would require before the item can be submitted. Work the list here and watch the gate hold, or load it into RTI and let it enforce the real thing.

Before the draw-down

Drains feeding the separator closed and signed
Owner and bay users told first, hosing and wash-down stopped, and the inlets plugged or signed so nothing flows in while the tank is empty.
Oily waste hauler's license and manifest ready
Hauler registered to carry oily water and sludge where the state requires it, with the manifest made out for the waste type before the hose goes in.
No photo
Tank air monitored through the draw-down
Beyond the quarterly spot reading, a multi-gas meter kept at the opening for flammable vapor, oxygen and hydrogen sulfide as the level drops and sludge is stirred up.
Entry into the empty tank only on a confined-space permit
Media and probe pulled from the rim; if anyone must go in, the site's permit is issued first with ventilation, continuous monitoring, an attendant and rescue set up.
No photo

Media and internals

Coalescing media pulled, inspected and cleaned or replaced
Media removed with the tank drawn down, checked for blinding and breakdown, cleaned or swapped, baffles and weirs clear.
No photo
Baffles, weirs and internal supports sound
Baffles and weirs, plus any media frame, guide rails or lifting eyes, not corroded, bent or loose, so flow can't bypass the separating chamber.
Tank shell, seams and pipe entries checked with a light
Empty tank viewed from the rim for cracks, corrosion, coating loss or groundwater seeping in at the seams and where the pipes enter.
Outlet oil-stop float checked where fitted
Float or oil-stop valve at the outlet cleaned and moved through its travel by the manufacturer's method, so it closes the outlet before oil can carry over.
No photo
Sample and inspection ports cleared and resealed
Ports opened, cleaned out so effluent is visible, gaskets sound and covers reseated without leaks.

Pump-out and records

Full pump-out completed with hauler manifest kept
Tank drawn down by the licensed hauler, volume and disposal recorded, signed manifest filed with the service record.
Year's readings reviewed against the discharge permit
Quarterly readings, any sampling the permit calls for and this service's findings set against its conditions, with any exceedance reported to the permit holder.
No photo

Refill and verification

Tank refilled and discharge appearance confirmed clean
Water leg re-established, flow restored through the unit and the outlet running clear with no sheen. Observe appearance only, not lab limits.
Oil alarm probe proven in oil where fitted
Beyond the quarterly trip, the receiver told first, then the probe tested in oil or by the manufacturer's method at its set height and the alarm seen where it reports.
No photo
Drains reopened and the owner told it is back in service
Plugs and signs pulled from the inlets, any alarm panel reading normal, and the owner, bay users and any alarm receiver told the separator is back in service.
No photo

What usually sends this back

The failures are almost always the evidence, not the work

Tank pumped but the coalescing media left in place year after year, blinded solid, so oil and water pass straight through no longer separating.
Pump-out done without a hauler manifest kept, so there's no record of volume or disposal when it's asked for.
Sample or inspection port left silted over and never cleared, so future quarterly checks can't actually see the effluent.

Verified against

IPC / UPC plumbing codes

Common questions

6 answers

What does this oil-water separator annual checklist cover?: 14 items across 4 sections, covering before the draw-down, media and internals, pump-out and records, refill and verification. Each item spells out what the person walking the job is actually looking for, not just a box to tick.
Who should run this inspection?: The plumbing service tech with the licensed pump-out hauler on the annual visit.
When in the schedule should this walk happen?: Once a year, coordinated with the pump-out so the tank is drawn down and the media can actually be pulled and looked at.
Why do these items ask for a photo?: 7 of the 14 items call for photo evidence, 8 photos in all. A checklist answer without the photo is a claim; the photo is what makes the record worth something in a dispute and lets a reviewer approve work without re-walking the job.
What most often fails an oil-water separator annual inspection?: Tank pumped but the coalescing media left in place year after year, blinded solid, so oil and water pass straight through no longer separating. Pump-out done without a hauler manifest kept, so there's no record of volume or disposal when it's asked for. Sample or inspection port left silted over and never cleared, so future quarterly checks can't actually see the effluent.
Can I use this checklist in RTI?: Yes. Start a free RTI workspace, build this list as a checklist, and the Photo Gate holds the submit button until every mandatory item is answered and its photos are attached. Approved inspections roll into a branded turnover package with a tamper evident audit trail.

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Run it with the Photo Gate

A checklist nobody can submit half-finished

Load this list into RTI, stick a QR tag on the area it covers, and the submit button stays locked until every mandatory item is answered and the 8 required photos exist. Approved walks roll into a branded turnover package with a tamper evident record behind every line.