Cadmium Exposure Limits Under 1910.1027: Why 3 µg/m³ Starts a Medical Surveillance Program

The sample comes back at 3 micrograms of cadmium per cubic meter of air. Someone compares it against the OSHA permissible exposure limit of 5 µg/m³, writes “under the PEL” on the cover sheet, and closes the file. The arithmetic is right and the conclusion is wrong, because 29 CFR 1910.1027 carries a second airborne number underneath the exposure limit. The action level sits at 2.5 µg/m³, and 3 µg/m³ cleared it. From the date of that sample the facility owes periodic exposure monitoring, and if the exposure recurs often enough, a medical surveillance program with blood and urine testing.

Operating at 3 µg/m³ breaks no rule. The citation risk lives in the programs that result switches on, which a facility reading only the PEL never knows it started.

What is the OSHA permissible exposure limit for cadmium?

The permissible exposure limit for cadmium is 5 micrograms per cubic meter of air as an 8-hour time-weighted average, set at 29 CFR 1910.1027(c). The number has stood unchanged since the standard took effect on December 14, 1992. It applies to cadmium and cadmium compounds in all forms, across general industry.

Later amendments, through 77 FR 17781 on March 26, 2012, moved sign legends and hazard communication language without touching the limit. A program document citing a different airborne cadmium number is either quoting a Table I engineering control limit, discussed below, or it predates this standard entirely. See also the OSHA PEL framework.

What is the cadmium action level, and why does it matter more than the PEL?

The action level is 2.5 µg/m³ as an 8-hour time-weighted average, exactly half the PEL, defined at 29 CFR 1910.1027(b). The action level, rather than the exposure limit, is what triggers periodic exposure monitoring and medical surveillance enrollment. A result of 3 µg/m³ is below the permissible exposure limit and still starts a surveillance obligation, which is where most cadmium programs fail.

Read it as two checklists keyed to two numbers.

At or above 2.5 µg/m³: periodic exposure monitoring at a frequency representative of the exposure, medical surveillance enrollment for employees so exposed on 30 or more days in a twelve-month period, and the biological monitoring loop that enrollment carries.

Above 5 µg/m³: regulated areas with controlled access, respirators, protective work clothing at no cost, change rooms and showers, a written compliance program reviewed at least annually, and monitoring at least every six months.

The same two-number design governs several Subpart Z health standards, and the closest sibling is OSHA’s hexavalent chromium limits.

Does the cadmium standard apply to my facility if we never buy cadmium?

Yes, if cadmium is present in any form. 29 CFR 1910.1027(a) covers “all occupational exposures to cadmium and cadmium compounds, in all forms.” Welding on cadmium-plated stock, brazing with cadmium-bearing filler metal, melting mixed scrap, and electronics or battery recycling all generate exposure with no cadmium anywhere on the purchase order.

Table I names the industries OSHA expected to carry the program: nickel-cadmium battery manufacturing, zinc and cadmium refining, cadmium pigment manufacture, cadmium stabilizer production, lead smelting, and electroplating in the form of mechanical plating. The real population runs wider, because cadmium almost always arrives as a constituent rather than as a product somebody ordered.

The operations that get missed have a pattern. Welding and thermal cutting on cadmium-plated or cadmium-pigmented stock puts cadmium fume in a breathing zone with no cadmium on any inventory sheet. Brazing and silver-solder work with cadmium-bearing filler metals does the same thing at lower volume and higher temperature. Scrap metal and electronics recycling, battery breaking, and foundries melting mixed charges all liberate it from material whose composition nobody controls. Plastics compounding with cadmium pigments or cadmium stabilizers handles it as a powder. None of those facilities would describe itself as a cadmium plant, and all of them can produce a result above 2.5 µg/m³.

OSHA’s own paperwork estimate counts 56,355 respondents and 248,931 responses a year for this standard (91 FR 54401, OMB control number 1218-0185).

Self-qualifying takes four steps, in order. First, identify any process that involves cadmium-bearing metal, pigment, stabilizer, plating or filler, including cadmium that arrives as a scrap constituent. Second, run full-shift personal breathing-zone sampling for each job classification in each work area, which is what 1910.1027(d)(1)(iii) asks for. Third, compare every result against 2.5 µg/m³ before comparing it against 5 µg/m³, because the lower number is the one that starts programs. Fourth, count how many days a year that exposure actually occurs, since the medical surveillance question turns on whether it happens on 30 or more days in twelve consecutive months.

Two off-ramps exist and both are narrower than they look in summary.

The first is the monitoring discontinuation rule at 1910.1027(d)(3)(ii). Periodic monitoring may stop when a result is below the action level, and only when that result is confirmed by a second sample taken at least seven days later. One clean sample does not close the file, and two samples taken the same week do not satisfy the seven-day separation. The second is the engineering control exemption at 1910.1027(f)(1)(iii), which applies only where an employee is both intermittently exposed and not exposed above the PEL on 30 or more days per year, measured over twelve consecutive months. Both conditions have to hold.

On scope, general industry sits under 1910.1027, while construction work on the same metal falls under 29 CFR 1926.1127. The welding route into cadmium exposure overlaps heavily with the one described in stainless steel welding fume monitoring.

What are the SECALs in Table I, and when do they replace the PEL?

Separate engineering control limits at 29 CFR 1910.1027(f)(1)(ii) and Table I set 50 µg/m³ for nickel-cadmium battery plate making and plate preparation, zinc and cadmium refining, pigment calcining, crushing, milling and blending, stabilizer production and lead smelting, and 15 µg/m³ for other nickel-cadmium battery processes, other pigment processes and mechanical plating. They govern engineering controls only. Processes Table I does not list have to meet the 5 µg/m³ PEL.

A SECAL is OSHA’s acknowledgment that engineering controls in certain high-temperature or high-dust processes cannot realistically reach 5 µg/m³, so the engineering obligation gets measured against 15 or 50 µg/m³ instead. The split inside each industry is the part that gets missed, because Table I assigns limits by process rather than by plant.

In nickel-cadmium battery manufacturing, plate making and plate preparation carry the 50 µg/m³ limit while every other process in the same building carries 15 µg/m³. In zinc and cadmium refining the 50 µg/m³ limit covers cadmium refining, casting, melting, oxide production and sinter plant operations. Cadmium pigment manufacture splits the same way: calcining, crushing, milling and blending at 50 µg/m³, other pigment processes at 15 µg/m³. Cadmium stabilizer production carries 50 µg/m³. Lead smelting carries 50 µg/m³ for the sinter plant, the blast furnace, the baghouse and the yard area. Electroplating appears only as mechanical plating, at 15 µg/m³.

The consequence is the part worth writing down. A process that sits inside one of those industries and is not named in Table I does not get a SECAL at all. It has to meet the 5 µg/m³ PEL like any other operation. A nickel-cadmium battery plant therefore runs three engineering targets at once.

The SECAL governs engineering controls and nothing else. Employee exposure above 5 µg/m³ still requires respirators under paragraph (g), regulated areas under paragraph (e), and the hygiene facilities under paragraph (j), whatever the applicable SECAL says.

How often must cadmium exposure monitoring be repeated?

Initial monitoring is required under 29 CFR 1910.1027(d)(2)(i). At or above the action level, monitor at a frequency representative of the exposure. Where exposure exceeds the PEL, the floor is at least every six months under (d)(3)(i). Monitoring stops only on a below-action-level result confirmed by a second sample at least seven days later, per (d)(3)(ii).

Sampling has to be accurate to within plus or minus 25 percent at the 95 percent confidence level (1910.1027(d)(6)). Affected employees have to be notified in writing within 15 working days of the employer receiving results ((d)(5)(i)), and that clock runs from receipt of the lab report rather than the sampling date. Objective data may stand in for monitoring under (d)(2)(iii), though an undocumented judgment that exposures are low counts as no determination. Employee access follows the rule in exposure record access within 15 days.

Which employees must be enrolled in cadmium medical surveillance?

Currently exposed employees at or above the 2.5 µg/m³ action level are covered, unless they are not so exposed on 30 or more days in twelve consecutive months, under 29 CFR 1910.1027(l)(1)(i)(A). Previously exposed employees are also covered unless their cadmium work ended more than 60 months before the standard’s effective date, under (l)(1)(i)(B).

Initial examinations are due within 30 days of initial assignment, and an examination performed within the previous 12 months can be credited against that requirement (1910.1027(l)(2)(i), (l)(2)(iii)). From there the standard specifies the panel rather than leaving it to the physician. Every initial and periodic examination has to include cadmium in urine standardized to grams of creatinine, beta-2-microglobulin standardized to grams of creatinine with the pH specified, and cadmium in blood standardized to liters of whole blood ((l)(2)(ii)(B)).

Periodic medical examinations fall one year after the initial examination and then at least biennially after that, while the biological sampling itself runs at least annually ((l)(4)(i)). A facility that puts both on the same two-year cycle misses a year of required urine and blood work.

Examination content at (l)(4)(ii)(A) through (I) is prescriptive. It includes a blood pressure measurement, a review of respiratory and urinary history, a chest X-ray, forced vital capacity and forced expiratory volume in one second, blood urea nitrogen, a complete blood count, serum creatinine, a urinalysis covering albumin, glucose, total protein and low-molecular-weight proteins, and prostate palpation for male employees over 40.

What are the cadmium biological monitoring trigger levels?

Under the tier in force since January 1, 1999, at 29 CFR 1910.1027(l)(3)(iv), action is required if cadmium in urine exceeds 3 µg per gram of creatinine, beta-2-microglobulin exceeds 300 µg per gram of creatinine, or cadmium in blood exceeds 5 µg per liter of whole blood. A higher tier of CdU above 7, CdB above 10 or beta-2-microglobulin above 750 adds a full medical examination within 90 days.

This is the most frequently misquoted passage in the standard, and the reason is visible in the regulation itself. Paragraph (l)(3) holds three overlapping tiers. Subparagraphs (l)(3)(i) through (iii) were written for the phase-in period before 1999 and carry the older trigger values of CdU above 15, CdB above 15 and beta-2-microglobulin above 1,500. Subparagraph (l)(3)(iv) applies “in lieu of” those paragraphs from January 1, 1999 forward. Both sets are still printed in the CFR, one above the other, and vendor decks and internal program manuals routinely quote the superseded set. If your program tells an occupational physician to act at 15 µg per gram of creatinine, it is running on numbers that stopped applying more than 25 years ago, and the threshold that matters is five times lower.

The current tier obliges a sequence on a clock,. On a first-tier exceedance the employer reassesses the employee’s exposure within two weeks, corrects any deficiency the reassessment finds within 30 days, and provides a full medical examination within 90 days. The employee then moves to semiannual biological monitoring with annual examinations until the levels fall back below the trigger values.

The second tier of CdU above 7, CdB above 10 or beta-2-microglobulin above 750 carries the same actions plus the 90-day full examination, and it opens the door to mandatory removal if the next set of results confirms the exceedance. Nothing in that sequence waits for an air sample to exceed the PEL. The biological result alone starts it.

When is medical removal from cadmium exposure mandatory, and what does the employee get?

Removal becomes mandatory under 29 CFR 1910.1027(l)(3)(iv) when a second confirming set of results exceeds CdU 7, CdB 10 or beta-2-microglobulin 750 and CdU exceeds 3 or CdB exceeds 5. Medical removal protection benefits run up to a maximum of 18 months under (l)(12)(i), with biological monitoring at least every three months while the employee is removed.

Removal becomes mandatory only after a second set of results confirms the first, and the confirming set has to exceed the second-tier values while CdU exceeds 3 or CdB exceeds 5.

While the employee is removed, the employer provides biological monitoring at least every three months and medical examinations at least every six months (1910.1027(l)(11)(i)(D)). Return to work at or above the action level is gated on numbers rather than on time served. The employee goes back when cadmium in urine is at or below 3 µg per gram of creatinine, cadmium in blood is at or below 5 µg per liter of whole blood, and beta-2-microglobulin is at or below 300 µg per gram of creatinine ((l)(11)(iv)). All three have to clear.

Medical removal protection benefits run up to a maximum of 18 months under (l)(12)(i). Cadmium has a long biological half-life and the kidney markers lag further still, so a removal triggered by an exposure nobody caught for two years can run most of that 18 months.

Can we rotate employees to stay under the cadmium PEL?

No. 29 CFR 1910.1027(f)(1)(v) states that “the employer shall not use employee rotation as a method of compliance.” Engineering and work practice controls come first under (f)(1)(i). Where those controls cannot reach the applicable limit, the employer installs them anyway and supplements with respirators under (f)(1)(iv) and paragraph (g).

A facility that demonstrates its ventilation cannot achieve 5 µg/m³ does not earn relief from installing ventilation. It owes both. Where the PEL is exceeded, a written compliance program is required and reviewed at least annually, and ventilation effectiveness is re-measured within five working days of a significant change ((f)(2), (f)(2)(iii), (f)(3)(ii)).

What hygiene facilities does the cadmium standard require?

For employees exposed above the 5 µg/m³ PEL: change rooms with separate storage for street clothing and protective clothing, handwashing facilities, showers taken at the end of the shift, and lunchrooms meeting 29 CFR 1910.141, under 1910.1027(j)(1) through (j)(3). Lunchroom air may never reach 2.5 µg/m³, and protective clothing may not be worn in unless surface cadmium has been removed by HEPA vacuuming or an equivalent method, per (j)(4).

That lunchroom line is the only place in the standard where the action-level concentration works as a hard ceiling rather than a trigger. Employees above the PEL shower at the end of the shift and wash their hands and face before eating, drinking, smoking, chewing tobacco or gum, or applying cosmetics ((j)(3)(i) and (j)(3)(ii)).

Protective work clothing is provided at no cost wherever exposure is above the PEL, and also wherever skin or eye irritation associated with cadmium occurs at any exposure level ((i)(1)). The handling rules are specific: contaminated clothing comes off only in the change room, it does not leave the workplace except for authorized laundering or disposal, it travels in sealed impermeable bags, and it is cleaned and dried at least weekly ((i)(2) and (i)(3)(i)).

Housekeeping follows a hierarchy rather than a standard of cleanliness. Surfaces stay as free as practicable of cadmium accumulation and spills get cleaned as soon as possible, with HEPA vacuuming as the preferred method. Shoveling and dry or wet sweeping and brushing are permitted only where vacuuming has been tried and found ineffective ((k)(5)). Compressed air is prohibited for cleaning unless it is used together with a ventilation system designed to capture the airborne dust ((k)(6)).

How long must cadmium records be kept?

Air monitoring records and objective data records have to be kept at least thirty years under 29 CFR 1910.1027(n)(1)(iii) and (n)(2)(ii). Medical surveillance records have to be kept for the duration of employment plus thirty years under (n)(3)(iii). Employee medical records have to be made available within 15 days of a request, per (n)(4)(ii).

Retention is where the structure of this standard shows up in enforcement terms. Because nearly every obligation hangs off the action level rather than an over-limit air reading, the failure modes that produce findings are documentary: no initial monitoring on file, no written notification, no annual program review, no surveillance enrollment for a population already sampled above 2.5 µg/m³. A serious or other-than-serious violation carries a 2026 maximum of $16,550, and a willful or repeated violation a maximum of $165,514 (OSHA memorandum, May 21, 2026). Those are the 2025 figures carried forward, because the memo states there were no inflation-based increases to OSHA civil penalties for 2026, explained in the cancelled 2026 penalty adjustment.

This post puts no citation count or enforcement dollar total behind cadmium. OSHA’s industry profile pages for the standard are closed to automated retrieval, and 1910.1027 does not appear on the agency’s preliminary top-ten cited standards list for fiscal year 2026. Absence from that list says nothing about the absolute number of citations issued.

Which cadmium paragraphs would OSHA’s 2026 respirator proposal actually delete?

RIN 1218-AD60 (90 FR 28330, July 1, 2025, with the rulemaking record reopened at 91 FR 46037 on July 22, 2026) targets four paragraphs: the respirator selection table at 1910.1027(g)(1)(i) through (vii), to be replaced by a cross-reference to 1910.134(a)(2); the full-facepiece requirement at (g)(3)(i)(B); the HEPA filter requirement at (g)(3)(i)(C); and respirator language in training at (m)(4)(iii)(E). No final rule exists.

Both comment periods have closed, the reopened record ended August 21, 2026, and hearings in the broader package concluded August 26, 2026. Until a final rule publishes, paragraph (g) binds as written: full-facepiece respirators where cadmium causes eye irritation, HEPA filters in air-purifying respirators.

Cadmium appears as item 9 of 23 on OSHA’s deregulatory rulemaking page, alongside parallel respirator proposals for asbestos, benzene, lead and formaldehyde. The reading for a plant manager is narrow. The PEL, the action level, the Table I limits, the monitoring cadence, the biological triggers and the thirty-year retention are untouched. A facility that reads “deregulatory” and eases off action-level monitoring has misread which paragraph is moving. The package is described in OSHA’s 2026 proposed carcinogen and respiratory changes.

Do cadmium requirements differ in Kansas, Oklahoma, Missouri, Nebraska, Texas or Colorado?

No. None of the six runs any OSHA-approved State Plan at all, whether a full plan or one limited to state and local government employees, so federal 29 CFR 1910.1027 applies as written to private-sector general industry in all of them, with no more-stringent state analogue to check.

Cadmium is also a RCRA toxicity characteristic constituent and TRI-listed, with separate thresholds.

What to do with a cadmium result at or above 2.5 µg/m³

Date-stamp the lab report on receipt. That date starts the 15 working days for written employee notification under 1910.1027(d)(5)(i).
Count the days. Whether the exposure occurs on 30 or more days in twelve consecutive months decides medical surveillance enrollment under (l)(1)(i)(A).
Put the affected job classifications on a sampling calendar. Above the PEL it runs at least every six months under (d)(3)(i), and only two results seven days apart below the action level end it.
Pull every program document that states a cadmium biological trigger. If it says 15, 15 and 1,500, replace it with the (l)(3)(iv) values of 3, 300 and 5, and the second-tier values of 7, 10 and 750.
Send the occupational physician what paragraph (l) requires: the standard, the job description, the representative exposure level and the respirator information.
Check the plant against paragraph (j) if anyone is above 5 µg/m³: change room separation, shower access, lunchroom air, and the HEPA vacuum step before clothing enters a clean area.
File air monitoring records for thirty years and medical records for employment plus thirty years under (n).

Facilities working through that list usually find the same two gaps. No one owns the sampling calendar, and no one owns the biological monitoring cycle it created. iSi’s industrial hygiene team runs the full-shift personal sampling to the accuracy (d)(6) requires, handles the notification letters and the thirty-year records, and coordinates medical surveillance so the physician receives what paragraph (l) calls for. Where no one on site can carry a six-month monitoring cycle and an annual biological program on top of a day job, the EHS cooperative program, or EHS COOP, puts an iSi project manager on that calendar. Call iSi at (316) 264-7050 or contact us with the result in hand and you will get a response the same day.

Sources

29 CFR 1910.1027, Cadmium, full section text, GPO CFR 2024 Title 29 Volume 6 (action level at (b), PEL at (c), monitoring at (d), regulated areas at (e), controls and Table I SECALs at (f), respirators at (g), clothing at (i), hygiene at (j), housekeeping at (k), medical surveillance and removal at (l), signs and training at (m), records at (n), start-up dates at (p)): https://www.govinfo.gov/content/pkg/CFR-2024-title29-vol6/pdf/CFR-2024-title29-vol6-sec1910-1027.pdf (verified 2026-11-10)
OSHA memorandum, 2026 Annual Adjustments to OSHA Civil Penalties, May 21, 2026 (2026 maximums and the statement that there are no inflation-based increases for 2026, citing OMB Memorandum M-26-11): https://www.osha.gov/memos/2026-05-21/2026-annual-adjustments-osha-civil-penalties (verified 2026-11-10)
Federal Register notice of no 2026 inflation adjustment, May 27, 2026, FR Doc 2026-10456: https://www.govinfo.gov/content/pkg/FR-2026-05-27/pdf/2026-10456.pdf (verified 2026-11-10)
91 FR 46037, Cadmium, proposed rule and reopening of the rulemaking record, July 22, 2026, RIN 1218-AD60, docket OSHA-2025-0021: https://www.federalregister.gov/documents/2026/07/22/2026-14842/cadmium (verified 2026-11-10)
90 FR 28330, Cadmium, proposed rule and request for comments, July 1, 2025, RIN 1218-AD60: https://www.federalregister.gov/documents/2025/07/01/2025-11635/cadmium (verified 2026-11-10)
91 FR 54401, Cadmium in General Industry Standard; Extension of OMB Approval of Information Collection Requirements, August 21, 2026, OMB control number 1218-0185, docket OSHA-2012-0005 (56,355 respondents, 248,931 responses, 77,051 hours annual burden): https://www.federalregister.gov/documents/2026/08/21/2026-17151/cadmium-in-general-industry-standard-extension-of-the-office-of-managements-and-budgets-omb-approval (verified 2026-11-10)
OSHA deregulatory rulemaking page, listing Cadmium (RIN 1218-AD60) as item 9 of 23 in the substance-specific respirator package: https://www.osha.gov/deregulatory-rulemaking (verified 2026-11-10)
OSHA Top 10 Most Frequently Cited Standards, fiscal year 2026 preliminary list (October 1, 2025 through August 31, 2026), cited only for the fact that 1910.1027 does not appear on it: https://www.osha.gov/top10citedstandards (verified 2026-11-10)
29 CFR 1910.1027 Appendix A, Substance Safety Data Sheet for Cadmium: https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1027AppA (verified 2026-11-10)
29 CFR 1910.1027 Appendix E, Cadmium in Workplace Atmospheres, sampling and analytical method context: https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1027AppE (verified 2026-11-10)

Frequently Asked Questions

What is the OSHA permissible exposure limit for cadmium?

5 micrograms per cubic meter of air as an 8-hour time-weighted average, set at 29 CFR 1910.1027(c). The limit has stood unchanged since the standard took effect on December 14, 1992.

What is the cadmium action level?

2.5 micrograms per cubic meter as an 8-hour time-weighted average. A result at or above it starts periodic exposure monitoring obligations even though no exposure limit has been exceeded.

When does cadmium medical surveillance start?

When an employee is or may be exposed at or above the action level on 30 or more days per year, 1910.1027(l) requires a medical surveillance program that includes biological monitoring of blood and urine.

Is a result between the action level and the PEL a violation?

No. Operating between 2.5 and 5 micrograms per cubic meter breaks no rule. The citation risk lives in the monitoring and surveillance programs that result switches on, which a facility reading only the PEL never knows it started.