Plumbing and HVAC JHA: job hazard analysis example and generator

A plumbing or HVAC JHA starts with isolating the electrical, gas and water supply to the equipment. It also covers ladders, power tools, brazing, attics and crawl spaces, rooftop units and trenching for lines. It draws on several 29 CFR 1926 subparts: K (electrical), J (welding and cutting), AA (confined spaces), P (excavations) and M (fall protection).

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Draft only. Every JHA is a draft and must be reviewed by a competent person for the specific site before work begins. JHABox is not affiliated with OSHA or the US Department of Labor.

Plumbing, HVAC and mechanical contractors make up the largest specialty-trade group in the Census Bureau’s 2022 County Business Patterns data, with 109,601 employer establishments. The work can move from an attic to a roof to a trench in a single day, so the JHA has to follow the crew.

Common plumbing and HVAC hazards

Shock and stored energy when servicing equipment
Fire from brazing near framing and insulation
Heat and poor air in attics and crawl spaces
Falls at rooftop units
Trench cave-in on sewer and water lines

Sample plumbing and HVAC hazard table

Sample from the JHABox plumbing and HVAC library. Example task: “Condenser and air handler change-out with new line set” at a Florida address. Showing 5 of 9 steps.

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Swipe sideways to see the full table.

#	Job step	Potential hazards	Risk before controls	Controls	Risk after controls	29 CFR reference
1	Isolate equipment: electrical, gas and water	Shock from equipment that is still energized Pressurized water, steam or gas released Unexpected start-up of fans or compressors	HHigh	Lock and tag the disconnect at every point the unit can be energized Close and tag valves; bleed pressure before opening lines Verify zero energy before starting work	MMedium	1926.417(a) 1926.417(b) 1926.416(a)(1)
2	Ladder access and use	Fall from ladder Ladder slides out or tips Electrical contact (metal ladder near energized parts) Losing balance while carrying materials	HHigh	Competent person inspects ladders; tag and remove defective ladders Extend side rails 3 ft above landing; secure top; set at 4:1 angle Set on stable, level base Use non-conductive (fiberglass) ladders near electrical work Face the ladder, keep one hand on it; hoist materials instead of carrying	MMedium	1926.1053(b)(1) 1926.1053(b)(5)(i) 1926.1053(b)(6) 1926.1053(b)(12) 1926.1053(b)(15) 1926.1053(b)(20)-(22) 1926.1060(a)
3	Power tools, cords and temporary power	Electric shock from damaged cords or tools Cuts and flying particles from saws and grinders Noise exposure	MMedium	GFCI on all temporary power and cords (or assured grounding program) Remove worn or frayed cords from service Keep tool guards in place; never bypass Safety glasses with side shields; hearing protection near loud tools	LLow	1926.404(b)(1)(i) 1926.416(e)(1) 1926.300(b)(1) 1926.102(a)(1) 1926.101(a)
4	Soldering and brazing (hot work)	Fire in framing, insulation or nearby combustibles Burns from torch and hot pipe Cylinder falls or leaks	HHigh	Move work to a safe location or shield combustibles; use a heat shield behind joints Fire extinguisher immediately available; fire watch after brazing Keep cylinders upright and secured	MMedium	1926.352(a) 1926.352(d) 1926.350(a)(9)
5	Crawl spaces, attics and pits	Hazardous atmosphere or poor air in a confined space Extreme heat in attics Fall through ceiling joists	HHigh	Competent person identifies confined spaces before work begins; permit procedures if required Attic work early in the day; ventilate; short rotations Walk only on joists or set boards across them	MMedium	1926.1203(a) 1926.21(b)(2)

Risk = Severity × Likelihood on a 3×3 matrix (1–2 Low, 3–4 Medium, 6–9 High). Citations link to the Electronic Code of Federal Regulations (eCFR).

Relevant 29 CFR 1926 subparts

KSubpart K: Electrical1926.400–1926.449 JSubpart J: Welding and Cutting1926.350–1926.354 AASubpart AA: Confined Spaces in Construction1926.1200–1926.1213 PSubpart P: Excavations1926.650–1926.652 MSubpart M: Fall Protection1926.500–1926.503 XSubpart X: Stairways and Ladders1926.1050–1926.1060

Key paragraphs we cite

1926.417(b)De-energized equipment tagged at every point it can be energized
1926.352(d)Fire extinguishing equipment immediately available for hot work
1926.1203(a)A competent person (someone who can identify the hazards and is authorized to correct them) identifies confined spaces before work begins
1926.652(a)(1)Protective system for excavations (5 ft or deeper unless stable rock)

Checked against the eCFR (Title 29, as amended through October 14, 2026). Confirm the current text, and any state plan rules that apply to your site.

Florida job sites

Florida: attic heat

Florida attics get dangerously hot. JHABox drafts schedule attic work early, add rotations, and include the heat-illness step with water, rest and shade controls on every Florida job.

Plumbing & HVAC JHA FAQ

Does OSHA require a written plumbing or HVAC JHA?

Federal OSHA has no construction standard that requires a document called a “JHA” (job hazard analysis). You still have to meet the specific 29 CFR 1926 standards for the work and run the accident-prevention program in 1926.20(b). General contractors (GCs), owners, and the US Army Corps of Engineers (USACE) often require one. USACE calls it an Activity Hazard Analysis.

Is an attic a confined space?

It can be. 1926.1203(a) requires a competent person to identify confined spaces before work begins and decide whether any are permit spaces. JHABox flags it as a step; the call is yours to make on site.

Can I hand this straight to my general contractor?

Not without review. Every JHABox document is a draft. A competent person (someone who can identify the hazards and is authorized to correct them) has to check it for that site, adjust it to real conditions, and sign it before work starts. JHABox is not affiliated with OSHA.

Is the Spanish version included?

Yes. Pick Spanish on the build form and the whole document comes out in Spanish, including the hazard table, personal protective equipment (PPE) list, and crew sign-off sheet. A paid document includes both languages.

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