Lead Exposure for the Worker, Not the Occupant

Why this matters

Most shops that touch old paint know the EPA renovation rule, because it is the one with the certification card and the warning sign. That rule protects the people who live in the house. It says almost nothing about the person holding the scraper, and the person holding the scraper is the one breathing the most lead on the job. The rule that protects your crew is OSHA's, it has its own numbers, and its central idea surprises people: until you have measured, the law presumes your crew is overexposed and you owe them the protection that goes with it.

Which rule is yours

Two federal regimes run side by side on the same job, and they answer different questions.

• EPA RRP (40 CFR 745 Subpart E) governs how renovation in pre-1978 homes is done so occupants, especially children, are not poisoned afterward: certified renovator, containment, cleaning verification. It reaches the firm and the work practice. See related: EPA Lead RRP Rule for Contractors.
• OSHA lead in construction (29 CFR 1926.62) governs what your employees breathe and swallow while they work. Residential renovation, repair, painting, demolition and most service work that disturbs painted surfaces is construction work, so 1926.62 is the usual home. Lead in a shop setting that is not construction (a battery room, a general-industry facility) sits under 29 CFR 1910.1025, which carries the same two airborne numbers.

A job can be RRP-compliant and still leave a tech overexposed, because containment protects the hallway and does nothing for the breathing zone inside it. Running RRP does not discharge 1926.62.

State plans sit on top. Twenty-odd states run their own OSHA programs, which must be at least as effective as the federal one and may be stricter. California is the large example: Cal/OSHA rewrote its lead standards with much lower airborne and blood lead triggers, with changes taking effect from 2025. If you work in a state-plan state, read that state's current text rather than this card's federal numbers. This is not legal advice; for a disputed determination, your state plan's consultation service or an industrial hygienist is the right call.

The two airborne numbers

Both are 8-hour time-weighted averages (TWA), meaning the average concentration over the shift, measured in the breathing zone, in micrograms of lead per cubic meter of air.

• Permissible exposure limit (PEL): 50 micrograms per cubic meter. No employee may be exposed above it without respiratory protection and the rest of the program.
• Action level: 30 micrograms per cubic meter. Crossing it does not require respirators, but it turns on exposure monitoring, training and, if it happens often enough, medical surveillance.

Long shifts shrink the PEL. Under 1926.62(c)(2), for a shift longer than 8 hours the allowable TWA for that day is 400 divided by the hours worked. A 10-hour day allows 40, a 12-hour day about 33. Shops running long renovation days routinely compare a 10-hour result against 50 and pass a measurement that fails.

Presumed overexposed until you measure

This is the part of 1926.62 that does the work on a small job. Section 1926.62(d)(2) lists tasks that are presumed to exceed the PEL until an exposure assessment shows otherwise, in three tiers.

The tier decides the respirator. A half-face air-purifying respirator with P100 filters has an assigned protection factor of 10, so it covers a presumed tier 1 task (up to 500). Tier 2 needs a protection factor of 50, which means a full-facepiece air-purifying respirator or better. Tier 3 is supplied-air territory and is not service-call work. Respirator use runs under a written program with medical evaluation and fit testing per 29 CFR 1910.134, which applies to construction through 1926.103. See related: OSHA Respiratory Protection - Annual Fit Test.

"Power tool cleaning" means removing paint or coating with a power tool (sanding, grinding, planing). The cheapest exposure control in this table is moving a task up the page. Putting a shrouded sander on a HEPA-filtered vacuum turns a tier 2 strip into a tier 1 strip, which changes the respirator, and a wet hand-scrape is lower still than a dry one. Choosing among those is a controls question. See related: The Hierarchy of Controls on a Service Call.

What interim protection means

While the presumption stands, 1926.62(d)(2)(v) requires the shop to provide, for each presumed task:

• respirators appropriate to the presumed tier, under the program;
• protective work clothing and equipment;
• change areas;
• hand washing facilities, and a rule that hands and face are washed before eating, drinking or smoking;
• biological monitoring in the form of initial blood sampling for lead and zinc protoporphyrin (ZPP, a blood marker that rises with longer-term lead effect on red cell production);
• training on lead hazards, respirators and the hygiene rules.

The hygiene items are not paperwork. Ingestion from hands, cigarettes, food and a beard is a real route on a lead job, and a crew that wears respirators perfectly while eating lunch on the tailgate in their work clothes is still taking lead in. Getting lead off the person before it reaches the truck and the house is its own procedure. See related: How to Keep Lead From Coming Home on You.

Getting out of the presumption

The exposure assessment is personal air sampling: a pump on the tech's belt drawing air through a filter cassette clipped near the collar for the full shift, sent to an accredited lab. It is taken on the task as actually done, on the people most exposed, and an industrial hygienist or an insurer's loss-control consultant can run it if nobody in the shop knows how. OSHA also accepts objective data or monitoring from the last 12 months on closely similar work, under conditions the standard sets.

Results route you three ways. Below the action level, a written negative determination ends most of the requirements for that task until the work changes. At or above the action level and at or below the PEL, monitoring repeats at least every 6 months. Above the PEL, monitoring repeats at least quarterly and the full program applies. A change in tools, crew or material means a new determination; last year's number on hand-scraping says nothing about this year's power planing.

Blood lead and medical surveillance

Air sampling tells you what was in the air. Blood lead tells you what got into the body by every route, which is why the two disagree and why the blood number usually wins an argument.

Under 1926.62(j), initial blood sampling is owed to any employee exposed at or above the action level on any day. Once an employee is at or above the action level for more than 30 days in any consecutive 12 months, the full program applies: blood lead and ZPP at least every 2 months for the first 6 months and every 6 months after that, every 2 months for anyone at or above 40 micrograms per deciliter, and medical examinations. Medical removal under 1926.62(k) is required at 50 micrograms per deciliter or above, with return allowed after two consecutive results below 40, and the employee keeps earnings, seniority and benefits during removal for up to 18 months.

Those blood numbers date from the late 1970s. Current federal health guidance is far lower: NIOSH's adult surveillance program uses 5 micrograms per deciliter as its definition of an elevated level, and CDC uses 3.5 for children. A tech at 20 is legal under federal OSHA and is carrying a level NIOSH treats as a problem. A shop that waits for the regulatory removal number has decided to wait for harm the medical literature already describes. Treat any upward trend as a finding about your controls.

A worked example

A three-tech crew is replacing 14 original wood windows in a 1952 house. The scope includes hand-scraping loose paint off interior sills and stools, power-sanding painted exterior trim before it is reused, and HEPA-vacuum cleanup. RRP is running for the occupants. The days are 10 hours.

Tier the tasks first. Hand-scraping is tier 1, presumed above 50. Sanding the trim with a plain random-orbit sander is power tool cleaning without dust collection, tier 2, presumed above 500. The crew lead swaps to a shrouded sander on a HEPA vacuum, which moves the sanding to tier 1. Every task is now tier 1, so half-face P100 respirators cover the crew, all three fit-tested and medically cleared under the program.

Interim protection on day 1. Coveralls, a change area set up in the garage, a hand wash station with soap and warm water at the garage door, initial blood lead and ZPP drawn for all three before the job.

Air sampling. The tech doing most of the scraping wears a pump for the full 10-hour shift. The lab reports a 10-hour TWA of 38 micrograms per cubic meter (illustrative). Against the adjusted PEL of 400 divided by 10, which is 40, the result is under by 2. Against an unadjusted 50 it would have looked comfortably under, which is the error the adjustment exists to prevent. Expressed as an 8-hour equivalent, 38 times 10 divided by 8 is 47.5, above the action level of 30. So the task needs repeat monitoring at least every 6 months, and if this crew runs more than 30 days in any 12 consecutive months at or above the action level, the full surveillance program.

Blood lead. The record card for the scraping tech:

BLOOD LEAD RECORD - employee T. (crew lead)
Standard: 29 CFR 1926.62(j)   Lab: accredited, per std
--------------------------------------------------------
Draw        Pb ug/dL   ZPP     Job / note
Day 0         4        normal  baseline before windows
Week 8       13        normal  windows, 6 wk scraping
Week 16      19        normal  second window job
--------------------------------------------------------
OSHA removal level: 50   OSHA 2-month draws from: 40
NIOSH elevated (adult): 5   Trend: up 15 in 16 weeks
Action: hygiene audit + air resample before next job

Nothing on that card triggers an OSHA action. The trend from 4 to 19 does trigger a shop action, because the air result says the respirator should be holding and the blood says something is getting through. The usual answers are ingestion and take-home: eating with unwashed hands, a respirator hung in the cab between tasks, coveralls worn into the truck. That is the next investigation. See related: The Tech Whose Blood Lead Came Back High.

What changes the call

• The work is not construction. A shop recycling lead-acid batteries or reclaiming lead flashing in its own building is under 1910.1025, with the same airborne numbers and its own presumptions and triggers.
• A state plan applies. In California, the levels above are not the numbers you are held to.
• The paint is tested and it is not lead. A lead inspection or XRF result showing no lead-based paint on the surfaces you will disturb removes the presumption for those surfaces. A swab kit used for RRP purposes is not an exposure assessment.

References

• 29 CFR 1926.62, Lead (construction), including (c) PEL and shift adjustment, (d) exposure assessment and presumptions, (j) medical surveillance, (k) medical removal
• 29 CFR 1910.1025, Lead (general industry); 29 CFR 1910.134 and 1926.103, respiratory protection
• NIOSH Adult Blood Lead Epidemiology and Surveillance (ABLES) program, elevated blood lead definition
• See related: EPA Lead RRP Rule for Contractors; Dose, Route and the Exposure You Cannot See
• See related: The Exposure and Medical Records SOP