14.1 Interior Dust Cleanup Sequence

Cleanup is abatement work, not a janitorial afterthought

Quick Answer: 40 CFR 745.225(d)(3)(ix) makes interior dust abatement/cleanup a required, hands-on supervisor course topic. Abatement includes all cleanup associated with the measures (745.223). HUD Guidelines Chapter 14, as a documented methodology under 745.227(a)(3), is the field sequence accredited crews are taught: HEPA vacuum, then wet wash with detergent, then HEPA vacuum again (or an equivalent multi-pass cycle), ceiling to floor and out the door toward the decontamination exit. A certified supervisor shall be onsite during the post-abatement cleanup of work areas (745.227(e)(2)). Ordinary household vacuums and construction shop vacuums are not HEPA. Do not dry-sweep. Repeat the cycle until a visual inspection finds no dust, debris, or residue — and remember visual cleanliness is necessary but not sufficient for the 5 / 40 / 100 µg/ft² action levels (floors / interior sills / troughs) on or after January 12, 2026.

This chapter is the interior dust job. Paint-removal methods are Chapter 13. Containment you built in Chapter 10 is still up while you clean; you take sheeting down as part of this sequence, not as a shortcut around it. Soil and exterior dust are Chapter 15. Waste characterization is Chapter 17. Who wipes, the 1-hour sampling clock, and what a failed sample means are Section 14.2 and Chapter 18. Do not mix those files.

Interior dust work shows up two ways on a supervisor exam, and both use this sequence:

1. Cleanup after paint-disturbing abatement — replacement, enclosure, encapsulant work, or paint removal in a contained room. The crew made dust. Cleanup is how that dust leaves before an independent inspector or risk assessor tests.
2. Interior dust abatement as the measure itself — the work order is to permanently take dust-lead below the action levels on floors, sills, and troughs. That is still abatement under 745.223, still needs a supervisor on site for the cleanup, and still ends in post-abatement testing. It is not a household maid service and it is not RRP cleaning verification.

HUD Chapter 11 dust removal as an interim control is a different design choice (Chapter 5). This section assumes the job is abatement: you are taking dust below action levels, and you will be judged by wipe samples, not by a white-glove glance.

Why the supervisor is physically there for mopping

745.227(e)(2) is short and easy to misread. A certified supervisor shall be onsite during all work-site preparation and during the post-abatement cleanup of work areas. At other times when abatement is underway, the supervisor may be on site or available by telephone, pager, or answering service and able to arrive in no more than 2 hours.

Cleanup is not an other time. HEPA vacuuming, wet washing, pulling sheeting, cleaning troughs, and the last pass on the floor are post-abatement cleanup of work areas. The 2-hour phone rule that covers mid-removal does not cover the mop. A certified worker with a good memory of last month's job does not become the on-site supervisor because the plastic is already down.

Worked example — supervisor at the supply house. Windows came out at 2 p.m. The supervisor leaves for fittings and texts the crew to start final cleanup so the risk assessor can wipe at 4. That is a 745.227(e)(2) failure even if every HEPA pass was textbook. Cleanup does not start until the certified supervisor is in the unit.

HEPA vacuum versus shop vacuum versus household vacuum

HEPA means high-efficiency particulate air. In this trade it means a vacuum whose filtration captures 99.97 percent of particles 0.3 micrometers and larger, in a sealed machine that does not leak dirty air around the filter, the bag, or the lid. EPA uses that 0.3 µm / 99.97% efficiency language for HEPA exhaust on restricted power tools (745.227(e)(6)(ii)). OSHA and HUD use the same idea for vacuums.

OSHA 29 CFR 1926.62(h) (housekeeping on construction lead jobs):

• All surfaces shall be maintained as free as practicable of accumulations of lead.
• Cleanup of floors and other surfaces where lead accumulates shall, wherever possible, be done by vacuuming or other methods that minimize the likelihood of lead becoming airborne.
• Shoveling, dry or wet sweeping, and brushing may be used only where vacuuming or other equally effective methods have been tried and found not to be effective.
• Where vacuuming methods are selected, the vacuums shall be equipped with HEPA filters and used and emptied in a manner that minimizes reentry of lead into the workplace.
• Compressed air shall not be used to remove lead from any surface unless it is used with a ventilation system designed to capture the airborne dust.

HUD Chapter 14 is blunt in a different sentence: a HEPA vacuum is required if a vacuum is used. That is documented methodology for how you implement both the OSHA housekeeping rule and EPA's duty to control lead-contaminated dust.

A cardboard box that says HEPA on a replacement bag does not convert a leaking shop vacuum into a HEPA vacuum. If dirty air can bypass the filter at the lid, the hose cuff, or a cracked canister, the machine is a distribution device. Empty HEPA vacuums in a way that does not dump the collection chamber into the room — outdoors in a contained waste area, or into a sealed bag, per the manufacturer and Chapter 17. A helper knocking the filter against the porch rail is a new dust release.

Worked example — two vacuums in the van. The HEPA unit clogs. A worker grabs the wet/dry shop vacuum used yesterday for water and says it has more power. Using that machine on interior lead dust is the opposite of 1926.62(h)(4) and of HUD Chapter 14. Stop, clear the HEPA, or bring another HEPA. Do not finish the job with the shop-vac because the risk assessor is circling the block.

The HEPA / wet wash / HEPA cycle, and why the order exists

HUD Chapter 14 recommends a three-phase vacuum–wet cleaning–vacuum cycle for high-dust jobs and for rooms with rough or porous surfaces. Abatement interior work — window replacement, wet scrape, component removal, enclosure cuts — is a high-dust job unless you have a documented reason to treat it as otherwise. The rationale is mechanical, not ceremonial:

1. First HEPA vacuum. Dry bulk dust and chips, if you wet them first, become sludge that smears into pores, grout, carpet fiber, and unfinished wood. The first vacuum takes the load off so the wash is washing a film, not a pile.
2. Wet wash with detergent. A standard household detergent, not trisodium phosphate (TSP). Current HUD methodology dropped TSP as the magic lead soap; phosphate is not what makes a wipe pass. Detergent lifts ground-in film that vacuuming left behind. Use a three-bucket system (wash, rinse, wring/waste) or a use-once-and-toss disposable-wipe system so dirty water is not painted back onto the floor. Change water and rags when they load. Waterproof gloves. Do not flood live electrical devices — wipe them; do not hose them.
3. Second HEPA vacuum after the wash dries enough to vacuum. The wash loosens particles the first vacuum missed and leaves a thin residue when water evaporates. The second vacuum picks up what the detergent unlocked. Skip this pass on a porous floor and you are asking a 5 µg/ft² wipe to ignore what you can no longer see.

HUD notes that on some low-dust jobs with all smooth surfaces, wet cleaning alone may pass. Do not take that sentence as a license to skip HEPA on an abatement demolition. Other methods are acceptable if clearance is met and workers are not overexposed. The exam's default picture is still HEPA / wet / HEPA. One wet mop because we are late is not an equivalent multi-pass sequence.

Ceiling to floor, and toward the decon — not random orbits

HUD's sequence language is ceiling to floor and out the door. For a high-dust interior abatement, vacuum all surfaces in the room: ceilings, walls, trim, interior window sills, window troughs, hard-surface floors, and other horizontal surfaces. Start high. Gravity will re-soil anything you already washed if you clean the floor first and then knock dust off the crown. Move toward the decontamination exit so you are not walking clean floor in dirty boot covers. Finish one room before you start the next. A hallway you treat as a dump for tools is a reservoir that reloads every room it serves.

Window troughs deserve their own paragraph. The trough is not the stool. Inspectors sample both. A crew that wet-wipes the pretty interior sill and never opens the sash enough to clean the well will fail the trough, then grind trough dust onto the sill the first time someone opens the window. Weathered, pitted troughs hold lead in the wood grain. Extra vacuuming, extra wiping, and sometimes capping a destroyed trough with back-caulked coil stock (a repair/abatement method, not a wipe) are how you stop that reservoir. The exam bait is treating the trough as exterior, or as the inspector's problem.

Protective sheeting comes out as a dirty object, not as a drop cloth you shake

Before the room cycle, mist the floor and wall plastic so chips stay put, fold dirty-side in, and bag or wrap it as waste. Do not ball it up and walk it through a clean kitchen. Do not shake it out the back door. After sheeting is gone, the building surfaces get the HEPA / wet / HEPA cycle — including the floor that was under the plastic, because dust walked under tape and settled after you pulled the sheet.

HUD also tells you to wait at least 1 hour after active paint-disturbing work before final cleaning so airborne particles can settle onto surfaces you will then vacuum. That HUD hour is not the EPA sampling hour in Section 14.2. One is settle-before-you-clean. The other is wait-after-you-finish-cleaning before the inspector wipes. Honor both; do not collapse them into one coffee break.

Daily cleaning on a multi-day high-dust job is the same idea at smaller scale: pick up bulk debris, HEPA horizontal surfaces, maintain containment, and do not store debris in the dwelling overnight. Final post-abatement cleanup is still a separate, supervisor-on-site event after the last paint-disturbing pass.

Why one pass fails 5 µg/ft² floors

On or after January 12, 2026, the dust-lead action levels are 5 µg/ft² on floors, 40 µg/ft² on interior window sills, and 100 µg/ft² on window troughs (745.227(e)(8)(viii)). Do not study 40 / 250 / 400, or even 10 / 100 / 400, as the current post-abatement numbers. Older HUD Chapter 14 printings still show historic tables. The exam in 2026 uses the EPA action levels.

5 µg/ft² is a thin film. A single overlapping HEPA pass on a porous pine floor, or a mop that was already gray from the last room, leaves enough lead for a wipe to equal or exceed 5. Typical one-pass failures:

• Order error. Floor washed, then troughs and casing tops cleaned, so dust falls onto the wet floor.
• Reservoir left in place. HVAC left running; a wrapped sofa unwrapped onto the finished floor; a carpet edge that was never lifted; a radiator never touched.
• Wrong machine. Shop-vac exhaust re-seeded the room during the only vacuum pass.
• Dirty wash water. One bucket for four rooms. The last room is a thin lead glaze.
• Visual stopping rule. The floor looks empty, so the crew skips the second HEPA. Invisible dust is still dust. Visual is necessary (Section 14.2) and not sufficient for 5 µg/ft².
• Walking pattern. Boot covers from an uncleaned adjacent room, or the decon that was never actually used, print a lead track to the sample location.

Worked example — one-bedroom window replacement. Crew HEPA-vacuums the floor once, wet-mops it, and calls it done. Troughs still hold a gray line. Registers were never wiped. The risk assessor later reports the floor at 9 µg/ft² and the trough above 100. That is not bad luck. That is a one-pass sequence that never treated the reservoirs. Reclean the components represented by the failed samples (Section 14.2) — here, those floors and those troughs — not a philosophical argument that the walls looked fine.

Worked example — belongings stayed. The occupant protection plan (Chapter 8) allowed a dresser to remain, wrapped. Cleanup HEPA/wet/HEPA's the room around the plastic cube and never cleans the dresser. Plastic comes off at move-back. Drawer tops dump dust onto the cleared floor. The belongings were a reservoir. If they stay, they are cleaned, or they re-contaminate.

Wash water and filters are waste — do not make a storm-drain job

Dirty detergent water, sludge from buckets, spent HEPA filters, vacuum bags, used rags, and folded sheeting are waste streams. Characterization, the household exclusion, manifests, and state overlays are Chapter 17. The cleanup rule that belongs in this section is operational:

• Collect wash water in containers. Do not dump it in a storm drain, on the lawn, or in a floor drain that leads to the street. Stormwater is how interior lead becomes a play-area soil problem.
• Do not pour gray mop water down a neighbor's clean-out because the bucket is heavy.
• Filter changes and vacuum emptying happen as contained waste handling, not as a tap-out on the sidewalk.

Local sanitary-sewer rules vary; do not invent a federal permission to discharge lead wash water. Do not invent a federal command to drum every residential rinse as D008 on the spot. Chapter 17 is where TCLP, D008, and the household exclusion are decided. This chapter's command is: contain the liquid and the filters as waste, and never use a storm drain as a disposal method.

Supervisor decision test before the first HEPA pass. (1) Is the certified supervisor physically on site for this entire cleanup? (2) Is the machine a sealed HEPA vacuum, not a shop-vac? (3) Is the order HEPA, wet detergent, HEPA, high to low, toward the decon, room by room? (4) Are troughs, sills, trim tops, HVAC registers, radiators, carpets, and belongings on the map? (5) Is wash water going into a waste container, not a gutter? (6) Will a 5 µg/ft² floor wipe still have a reservoir to find if you stop after one pass?

Official sources: 40 CFR 745.225(d)(3)(ix) (interior dust abatement/cleanup, hands-on); 40 CFR 745.223 (abatement includes cleanup); 40 CFR 745.227(a)(3), (e)(2), (e)(8)(viii); HUD Guidelines Chapter 14 (HEPA / wet wash / HEPA; ceiling to floor and out the door; household detergent); 29 CFR 1926.62(h) (housekeeping, HEPA vacuums, limits on sweeping and compressed air).