AZ Has No Workplace Heat Standard. Denial Rate Isn't Public.

Arizona has the country’s heaviest occupational heat-death load. It also has the country’s thinnest workplace heat-protection framework. Until April 9, 2026, the state had no specific heat standard at all.

The Industrial Commission of Arizona approved the first state-level Heat Guidelines on that date, following Governor Hobbs’ Executive Order 2025-09 from May 22, 2025. The guidelines are guidance, not codified Arizona Administrative Code rule.

Why the Denial Rate Isn’t Published

The structural piece of this story isn’t a number. It’s the absence of one.

Arizona doesn’t publish carrier-by-carrier denial rates on heat-illness workers compensation claims. The Industrial Commission of Arizona’s Claims Division holds the underlying data. The state hasn’t released a heat-specific cross-tab on claims by year, by industry, by carrier, or by outcome.

Cal/OSHA publishes its heat-claim numbers. Cal/OSHA processes approximately 1,000 occupational heat-illness workers compensation claims per year, with both an outdoor heat standard (in effect since 2005) and an indoor heat standard (effective July 23, 2024 at 82 degrees indoors).

Arizona’s parallel data set, if it exists at all, sits in ICA’s filing system. To extract it requires a public records request under ARS 39-121, addressed to the ICA Claims Division, asking for: heat-illness coded claims by year 2023 to 2025, denial counts, and carrier-by-carrier breakdown.

That request hasn’t been filed publicly. The number you’d want to know if you’re an injured Arizona warehouse, construction, or roofing worker isn’t on the agency website.

What ADOSH Does and Doesn’t Do

The Arizona Division of Occupational Safety and Health (ADOSH) sits inside the Industrial Commission. It’s the state-plan OSHA agency for Arizona. ADOSH issued a State Emphasis Program (SEP) on outdoor and indoor heat-related hazards on July 17, 2023. The SEP is enforcement guidance, not a codified standard.

When ADOSH cites an employer for a heat-related violation, it cites under the federal General Duty Clause at 29 U.S.C. 654(a)(1). The clause requires ADOSH to prove three things: heat is a recognized hazard at the cited site, the employer failed to implement feasible controls, and those controls would materially reduce the risk.

That’s a higher evidentiary load than citing a specific code provision. It’s also why some heat-related deaths produce no citation at all. The same evidentiary load shapes how workers compensation carriers approach claim denials.

What ARS 23-930 Actually Says

The carrier penalty for unreasonable denial of a workers compensation claim sits at ARS 23-930.

The statute lets a claimant who proves an unreasonable denial collect a penalty equal to 25% of the benefits owed or $500, whichever is more. The Industrial Commission can also assess civil penalties up to $1,000 per violation against the carrier.

The 25%-or-$500 floor on benefits owed is the practical lever. On a $200,000 wrongful-death workers compensation claim, the unreasonable-denial penalty is $50,000. On a $5,000 emergency-room bill, it’s $1,250. The penalty isn’t enough to shift carrier behavior at the wholesale level, but it’s enough to recover meaningful additional dollars on individual cases.

ARS 23-1061(M) sets a 21-day denial clock that binds carriers only where the worker missed more than seven days. Heat deaths often happen on the day of exposure. The 21-day discipline doesn’t apply the same way for fatality claims.

The Six Heat Decedents on Public Record

KJZZ’s heatbeat coverage 2023 through 2024 has named six people who died from occupational heat exposure in Arizona, with their families’ or employers’ knowledge:

Each name reached public record through KJZZ, ABC15, or county medical-examiner reporting. Each death is documented separately. The cumulative pattern (named decedents, employer industries, ADOSH citations or absence of them, workers compensation outcomes) sits in the underlying agency files but isn’t published as an aggregate.

Pulling that aggregate is the next reporting step. It’s the structural backstop to the deaths the public has already heard about.

The Comparison That Doesn’t Land Yet

The proposal that triggered this dossier cited a 34% Arizona heat-claim denial rate against an 18% national average. That number didn’t verify against any retrievable primary source within the research window.

We’re not publishing it.

The verifiable structural finding stands without it: Arizona has no codified workplace heat standard until April 9, 2026 (and that’s still guidance), Arizona doesn’t publish a heat-illness claim count, and California processes about 1,000 such claims per year on standards Arizona didn’t adopt.

If the 34% number is real, it lives in ICA’s Claims Division files. The ARS 39-121 records request is the path to confirm it. Until that request lands, we report what’s in primary sources and we name what isn’t.

What Comes Next

Three near-term reporting moves close gaps in this story.

The first is the ICA Claims Division public records request under ARS 39-121: heat-illness coded claims by year 2023 to 2025, denial counts, and carrier-by-carrier breakdown. That single document either confirms the 34% denial rate or replaces it with the verified number.

The second is the MCDPH occupational subset of the 602 confirmed 2024 heat deaths. The cross-tab isn’t in the public release. A FOIA-equivalent request to the county yields it.

The third is the ADOSH heat-related citation list 2023 to 2025, cross-referenced against the named decedents (Perez, Nelson, Boni, Treatch, Mendoza, Holt) to confirm which deaths produced citations and which didn’t.

For now, the framework gap is documented. The June 1 heat-season starts in less than four weeks. The ICA Heat Guidelines are guidance.