Construction site toilet requirements: how many porta potties per worker in California

Short answer

Construction site toilets in California are governed by Cal/OSHA, not by the general building code, and the ratio is stricter than federal OSHA. Here is the rule set in one table; the sections below turn it into unit counts for real crews.

Whether the spec calls them construction site toilets, construction porta potties or portable restrooms, the inspector counts the same three things: toilets per sex, handwash stations, and whether the units are clean. Our Cal/OSHA construction toilet guide quotes the regulation text; this page is the practical version.

Are porta potties required on construction sites?

Yes, from the first day workers are on site. Cal/OSHA 8 CCR §1526 requires a minimum of one separate toilet facility for each 20 employees or fraction thereof of each sex, and the standard applies to every construction operation in California regardless of project size or duration.

Three details that catch contractors:

• "Or fraction thereof" means round up. 21 men need 2 toilets, not 1.
• "Of each sex" means a mixed crew of 6 needs 2 toilets, one for men and one for women, even if only one worker is a woman. Only crews under 5 may share a single lockable unit.
• Urinals count for up to half. A 40-man crew can use 1 toilet and 1 urinal instead of 2 toilets, but a standard porta potty with a urinal already satisfies this, so in practice the toilet count is what matters.

Federal OSHA 29 CFR 1926.51 allows 1 toilet for up to 20 workers and then 1 seat plus 1 urinal per 40. California's rule is stricter, and Cal/OSHA enforces its own standard, so size to §1526. Our construction page explains how we build this into every quote.

How many construction site toilets do you need?

Count men and women separately, divide each by 20, round up, add the results. Then add 1 handwash station per 20 total workers. The table below shows four typical crews and the Pottyline price for each configuration within 25 miles of Hayward.

Two notes on the math. A crew of 4 could run a single lockable unit under the small-crew rule; the moment the fifth worker arrives, the per-sex count applies, which is why we quote the 3-unit pack for any crew that will grow past 4. And the women's designated unit counts as the women's toilet under §1526, so it is not an extra unit; it replaces a standard one.

The porta potty calculator does this arithmetic for any crew size and applies the AB 521 designated unit automatically.

What about hand washing stations?

One washing station per 20 employees, near the toilets, with soap and single-use towels or a warm-air blower. That is Cal/OSHA §1527, and the two things inspectors cite most are stations placed far from the toilets and hand sanitizer offered in place of water.

Our two-sided handwash station holds 22 gallons of fresh water and 25 gallons of grey water, with foot pumps, soap and towel dispensers. Two sides means one station comfortably serves a 40-person crew at break time, which is why the table above pairs 2 stations with 40 workers rather than 1. On a 28-day rental it is $129 with weekly refill and restock; the hand washing station rental guide covers water consumption and refill math.

Do women need a separate toilet on a construction site?

Under §1526, yes: the 1-per-20 count is per sex, so any site with women on the crew needs at least one toilet for them. AB 521 (2023) went further and directed Cal/OSHA to require at least one single-user toilet per jobsite designated for employees who identify as female or nonbinary, with the Standards Board to consider adoption by the end of 2025. Verify current status with the OSHSB; our AB 521 guide tracks it.

Our women's designated unit is a standard-size portable restroom with a keyed lock, exterior signage and a sanitary disposal bin, $199 per 28 days. It satisfies the women's toilet count under §1526 today and the designated-unit requirement if and when it is adopted, so there is no reason to wait.

How often should a construction porta potty be serviced?

Weekly is the baseline, and it is included in our $189 monthly price. §1526 requires toilets to be kept clean and sanitary and does not fix a frequency, so the practical standard comes from tank capacity: a 70-gallon tank shared by 10 to 15 workers over a 5-day week is at a comfortable level at day 7 and unpleasant by day 10.

Add a second weekly service, $45 per unit per week, when any of these apply:

• More than 15 workers per unit (legal, but heavy use)
• 6-day work weeks or double shifts
• Summer heat in inland cities such as Livermore, Concord or Pleasanton
• Owner or GC specifications that call for twice-weekly service, common on hospital and school projects

Every service visit is photographed, GPS-stamped and timestamped, and the receipt is texted to the superintendent. For a Cal/OSHA inspection or an owner audit, the log exports as a PDF. Waste is disposed only at permitted receiving facilities such as EBMUD Resource Recovery in Oakland; we are a registered chemical-toilet hauler.

High-rise and tight sites

The 1-per-20 rule does not change on a 20-story frame, but the logistics do. Workers on floor 15 will not ride a hoist to a ground-level porta potty every time, so most Bay Area GCs place a toilet every 3 to 4 floors. Our high-rise crane-lift unit has a certified lifting frame and a 50-gallon tank, rents for $329 per 28 days, and is serviced on the floor with a vacuum hose run from the ground or the hoist.

On tight urban sites in Oakland and San Francisco, the constraint is usually the sidewalk. A porta potty inside the fence line needs no permit; one in the parking lane or on the sidewalk needs the city's right-of-way permit. San Francisco's Street Space permit explicitly lists portable toilets and requires a 4-foot clear pedestrian path; see our SF Street Space guide. A 250-gallon holding tank at $149 per month lets a cluster of units sit for longer between services where truck access is limited to one morning a week.

Bay Area specifics

Prices are all-in within 25 miles of our Hayward yard: delivery, pickup, one service per week, consumables and sales tax. The compliance pack is the configuration that satisfies §1526, §1527 and AB 521 for a crew of 5 to 20 with at least one woman.

Bay Area market rates for a standard construction unit run $150 to $230 per month before delivery, and San Francisco pricing runs about 30% above the national average. Full price list on the pricing page.

Delivery. Included to Hayward, Fremont, Oakland, San Mateo and every city within 25 miles. San Jose is 28 miles (about $11 extra), San Francisco 30 miles (about $18). Order by 2 PM for next-day delivery at $95; standard lead time is 2 business days.

Net-30 for approved contractors. One consolidated monthly invoice across all your sites, with the service photos attached per unit. Insurance certificates on request.

Permits. None for units inside your fence on private property. Public right-of-way placement needs an encroachment or obstruction permit from the city; Oakland's obstruction permit requires 5 feet 6 inches of sidewalk kept clear, San Francisco's Street Space permit 4 feet. We will place the unit where your permit drawing shows it.

What to do next

1. Count men and women on the crew at peak, not on day one. Divide each by 20 and round up.
2. Add 1 handwash station per 20 workers, placed next to the toilets.
3. Decide on service frequency: weekly is included; add a second visit above 15 workers per unit.
4. Check whether anyone other than construction personnel will use the units. If so, add an ADA unit at 5% of the cluster.
5. Book online with Net-30 or a card. Delivery within 25 miles is included.

Get your all-in construction site toilet price in 30 seconds: Instant price · or call (650) 977-2883. The owner answers, and he has run job sites himself.