There are 29 OSHA-approved state plans in the United States: 22 are full-coverage plans that regulate both private-sector and government employers, and 7 are public-sector-only plans that cover only state and local government workers. If you operate in a public-sector-only state, your private business is still regulated by federal OSHA — getting this wrong puts your Hazard Communication (HazCom) program under the wrong rulebook.
What Is an OSHA State Plan?
Under Section 18 of the Occupational Safety and Health Act (29 U.S.C. 667), states may operate their own occupational safety and health programs if OSHA approves them under the criteria in 29 CFR Part 1902 (and 29 CFR Part 1956 for plans limited to public employees). Each approved state plan must be "at least as effective as" federal OSHA. That means a state plan can match federal standards or exceed them — but it can never offer less protection.
This creates three jurisdictional buckets across the country:
- Federal OSHA states — federal OSHA enforces all standards directly.
- Full state-plan states — the state agency enforces standards for both private and public employers.
- Public-sector-only state-plan states — the state covers only government workers; federal OSHA covers private employers.
Who enforces HazCom where you work
The trap: a private business in a public-sector-only state follows federal OSHA, not its state agency. The 7 public-sector-only plans: CT, IL, ME, MA, NJ, NY, and the Virgin Islands.
The 29 State Plans at a Glance
| Plan type | Count | Who the state agency regulates | Who regulates private employers |
|---|---|---|---|
| Full-coverage state plans | 22 | Private + state/local government | The state plan agency |
| Public-sector-only state plans | 7 | State/local government only | Federal OSHA |
| Total approved state plans | 29 | — | — |
The 29 plans are listed one by one in 29 CFR Part 1952: §§1952.1 to 1952.22 are the full plans (21 states plus Puerto Rico), and §§1952.23 to 1952.29 the public-sector-only ones, each of which "only covers State and local government employers and employees."
The legal basis for this structure is 29 CFR Part 1902 (state plan criteria) and Section 18 of the OSH Act. The "at least as effective" requirement means HazCom rules in state-plan states track 29 CFR 1910.1200, though specific states add their own provisions.
The Public-Sector-Only Trap
A risky assumption is: "My state has its own OSHA, so I follow the state agency." In 7 of the 29 plans, that is wrong for private employers.
In a public-sector-only state, the state program protects firefighters, public works crews, school employees, and other government workers — but a private construction contractor, manufacturer, or distributor in that same state is inspected and cited by federal OSHA. You must:
- Know whether your state plan is full or public-sector-only.
- If public-sector-only and you are a private employer, follow federal OSHA standards and contact the federal OSHA Area Office for that region.
- If you are a government entity in any state plan (full or public-sector-only), follow the state program.
Compliance tip: Multi-state employers should map each jobsite to the correct enforcing agency before writing a single written HazCom program. A program built for the wrong jurisdiction can leave gaps an inspector will find.
"At Least As Effective" Means Some States Are Stricter
Because the floor is federal OSHA but there is no ceiling, several state plans impose stricter chemical and HazCom-related rules. Examples of how state plans diverge upward:
- Stricter chemical-specific exposure limits than the federal permissible exposure limits (PELs).
- Faster or earlier adoption of HazCom updates.
- Additional reporting and recordkeeping requirements.
When the federal HCS is revised, a state plan must promulgate a comparable standard within six months of the date of promulgation — not the effective date (29 CFR 1953.5(a)(1)). HCS 2024 was promulgated May 20, 2024 and took effect July 19, 2024, so the state clock ran from May.
HazCom 2024 Adoption in State-Plan States
The revised Hazard Communication Standard (HCS 2024, aligned primarily to GHS Revision 7) carries phased federal compliance dates:
| Requirement | Who | Federal compliance date |
|---|---|---|
| Substances | Manufacturers/importers/distributors | May 19, 2026 |
| Substances | Employers | November 20, 2026 |
| Mixtures | Manufacturers/importers/distributors | November 19, 2027 |
| Mixtures | Employers | May 19, 2028 |
The short version, with the full breakdown elsewhere
We read sixteen state rules directly; five of them are compared here. None of them land on the federal date:
| Jurisdiction | Substances — employers | Versus federal |
|---|---|---|
| Federal OSHA | November 20, 2026 | — |
| Washington | July 20, 2026 | 4 months earlier — already passed |
| Oregon | June 1, 2027 | ~6 months later |
| California | not adopted | §5194 is still the 2012 standard |
| Michigan | July 20, 2026 on the face of the rule | pinned before the extension existed |
| Minnesota | July 20, 2026 on the face of the rule | citation list stops before the extension |
Washington is the plainest case — its own rule prints the pre-extension date outright, and did not follow the four-month extension OSHA added later. Michigan and Minnesota show the subtler version of the same trap: each genuinely adopted HCS 2024, but each pinned the standard before January 15, 2026, so the paragraph they adopted still carries the original July 20, 2026 employer date rather than the extended one. Three different rules, the same pre-extension date, for the same reason.
Each rule is quoted, sourced and dated in the companion piece: HCS 2024 deadlines by state plan — including the three questions that settle your own state in ten minutes, and what a multi-state contractor should actually schedule.
These dates reflect the four-month extension (FR Doc 2026-00653). There is no 2029 compliance date. New HCS 2024 hazard classes include Chemicals Under Pressure (Appendix B.3.2), Aerosols Categories 1-3 (Appendix B.3), and Desensitized Explosives (Appendix B.17).
Jurisdiction Checklist
Use this quick checklist for every facility or jobsite:
- Is this state one of the 29 with an approved plan?
- If yes, is the plan full (22) or public-sector-only (7)?
- Am I a private employer or a government entity?
- If public-sector-only state + private employer -> follow federal OSHA.
- Have I confirmed the correct HazCom adoption deadlines for my jurisdiction?
- Is my written HazCom program built for the correct enforcing agency?
Build a Jurisdiction-Aware HazCom Program
Before you write your program, confirm whether your state runs a full plan, a public-sector-only plan, or leaves you under federal OSHA. Then generate a compliant, jurisdiction-aware written plan in minutes with the HazCom Program Builder, or review the underlying rule at Hazard Communication Standard 1910.1200.
Related: OSHA State Plans hub — every plan, its agency and its penalty cap · State plans explained: full vs public-sector-only vs federal · Cal/OSHA First Aid & CPR (a stricter state plan) · Complete OSHA HazCom Compliance Guide · HazCom Standard 1910.1200
Sources & verification (verified 2026-08-04 against osha.gov/stateplans — "currently 22 State Plans covering both private sector and state and local government workers, and seven State Plans covering only state and local government workers"): OSHA State Plans (osha.gov/stateplans) — 22 full-coverage plans (private + state/local government) and 7 public-sector-only plans (Connecticut, Illinois, Maine, Massachusetts, New Jersey, New York, and the Virgin Islands), 29 total; authority under Section 18 of the OSH Act and 29 CFR Part 1902; "at least as effective" requirement; state plans must adopt revised federal standards (e.g., HCS 2024) within six months of the federal promulgation date (29 CFR 1953.5(a)(1)); plan list re-checked against 29 CFR Part 1952 (eCFR, current as of September 25, 2026) on October 5, 2026. HCS 2024 dates verified against the HazComFast regulatory source of truth. Not legal advice — verify your jurisdiction and its adoption timeline directly.
Frequently Asked Questions
How many OSHA state plans are there?
There are 29 OSHA-approved state plans total. Of these, 22 are full-coverage plans that regulate both private-sector and state/local government workers, and 7 are public-sector-only plans that cover only state and local government employees, leaving private employers under federal OSHA jurisdiction. All 29 are listed in 29 CFR Part 1952 (§§1952.1 to 1952.29).
What is the public-sector-only trap in state plans?
Seven state plans — Connecticut, Illinois, Maine, Massachusetts, New Jersey, New York, and the Virgin Islands — cover only state and local government workers. In those states, private-sector employers are still inspected and enforced by federal OSHA, not the state agency, so you must follow the correct rulebook. Each of those plans 'only covers State and local government employers and employees' (29 CFR 1952.23 to 1952.29).
Do state plans have to be at least as effective as federal OSHA?
Yes. Under Section 18 of the OSH Act (29 U.S.C. 667(c)(2)), every OSHA-approved state plan must adopt standards and enforcement that are at least as effective as federal OSHA (29 CFR 1902.3(c)(1) and (d)(1)). A plan may go further with its own chemical rules: California, for example, sets its own exposure limits in Title 8 §5155.
Does the HazCom 2024 update apply in state plan states?
Yes, but the dates are not automatically the federal ones — and that is where employers get caught. State plans must adopt standards at least as effective as the revised federal standard, within six months of the federal promulgation date (29 CFR 1953.5(a)(1)), but each writes its own compliance schedule. Of the five plans compared here, none land on the federal date. Washington set July 20, 2026 for substances (WAC 296-901-14020) — four months earlier than federal, and already past. Michigan and Minnesota both adopted the 2024 rule but pinned it before the January 15, 2026 extension existed, so each carries that same July 20, 2026 date on the face of its rule. Oregon set June 1, 2027 (OAR 437-002-0376). California has not adopted HCS 2024 at all: Title 8 section 5194 still carries the 2013 and 2015 dates from the 2012 standard. Read your own state plan's rule, not the federal one.
Which state has the earliest HazCom 2024 deadline?
Of the five plans compared here, Washington, Michigan and Minnesota tie for earliest, all at July 20, 2026 — though for different reasons. WAC 296-901-14020, as amended by WSR 26-02-011 (filed December 30, 2025, effective February 1, 2026), requires employers, chemical manufacturers, importers and distributors evaluating substances to comply no later than July 20, 2026 — four months before the federal November 20, 2026 date in 29 CFR 1910.1200(j)(2)(ii). Washington adopted the federal schedule as it stood before OSHA extended every date by four months on January 15, 2026, and did not follow the extension. Michigan and Minnesota land on the same date by a different route: each pinned HCS 2024 before the extension existed, so the paragraph each adopted still carries that original date. Washington's mixture dates move the same way: manufacturers July 19, 2027 and employers January 19, 2028.
OSHA figures and citations here come from our regulatory source-of-truth modules, last checked against the eCFR, OSHA.gov, and the Federal Register on October 5, 2026. Last reviewed October 5, 2026.
About This Article
Published by: HazComFast
Published: June 25, 2026
Last Updated: October 5, 2026
This content is for informational purposes only and does not constitute legal advice.