Rental guide · Updated 2026-11-06
How Many Showers and Toilets Does an Indiana Crew Need? IOSHA and OSHA Ratios
Indiana runs its own OSHA plan; the sanitation ratios it enforces, turned into stall counts.
Key points
- Indiana private employers and state and local agencies fall under IOSHA, the state plan; federal sites stay with federal OSHA.
- Where a standard requires showers: one per 10 employees of each sex showering on the same shift.
- Construction toilets: one for up to 20 workers, then one seat and one urinal per 40.
Indiana is a state-plan state. Federal OSHA's own summary says the Indiana plan applies to nearly every private-sector workplace in the state and to state and local government employers, while federal employers, the Postal Service included, remain under federal OSHA. The plan won final approval in 1986. For a contractor sizing a shower trailer, that means the inspector is usually IOSHA, and the numbers come from the same federal sanitation standards Indiana adopted.
The ratios behind a stall count
- Showers, where a standard requires them: one shower for each 10 employees of each sex, or fraction of 10, who shower during the same shift, with hot and cold water, soap, and individual clean towels (29 CFR 1910.141(d)(3); construction repeats the ratio in 1926.51(f)(4)).
- Construction toilets: one toilet for 20 or fewer workers; one toilet seat and one urinal per 40 workers above that; one per 50 at 200 or more (29 CFR 1926.51, Table D-1).
Worked example
A second shift of 34 men and 9 women who all shower before leaving needs four showers for the men (34 rounds up to 40) and one for the women. A single 30ft Luxury Shower-Restroom Combination Trailer (10 Individual Stalls) covers that with stalls to spare; two 20ft Shower Container (5 Individual Stalls) units split by sex would also work. Size to the busiest half hour, not the daily total, and add an Luxury Shower-Restroom Combination Trailer (8 Individual Stalls + 1 ADA) when anyone on site needs an accessible stall.
Shower trailers in this guide: the 13ft Luxury Shower-Restroom Combination Trailer (3 Individual Stalls) (starting from $2,495 / month) for small crews and the 20ft Shower Container (5 Individual Stalls) (starting from $3,995 / month) for a mid-size shift.
Sources
- OSHA: Indiana State Plan (IOSHA): Indiana's plan covers most private-sector workplaces and state and local government employers; federal employers stay under federal OSHA. Initial approval March 6, 1974; final approval September 26, 1986.
- OSHA 29 CFR 1910.141: Sanitation (general industry): Where a standard requires showers, one shower for each 10 employees of each sex who shower on the same shift, with hot and cold water, soap, and individual clean towels.
- OSHA 29 CFR 1926.51: Sanitation (construction): Table D-1: one toilet for 20 or fewer workers; one toilet seat and one urinal per 40 workers above that; one per 50 at 200 or more. Showers, where required: one per 10 employees of each sex.
Links checked 2026-11-06. Figures quoted above appear on the linked pages.
