Holding Tank Rental in the Phoenix Area
A holding tank is a standalone waste tank that connects to a trailer, office trailer or other fixture with no sewer access. Operators pump it on a schedule. Maricopa County permits portable restroom units and holding tanks.
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Holding tanks are what make jobsite office trailers and sales trailers work before sewer lines are in.
Because the county permits holding tanks, ask the operator for their permit number up front.
Quick facts
Best uses for a holding tank
What to ask the operator
- What size tank fits our use?
- How often will you pump it?
- Do you hold the county permit?
Valley tip: Overflow is the risk. Set the pump schedule with some cushion.
The rules that apply
| Source | What it says |
|---|---|
| OSHA 29 CFR 1926.51(c), Table D-1 | Construction sites: 1 toilet for 20 or fewer workers; 1 seat and 1 urinal per 40 workers at 20 or more; 1 seat and 1 urinal per 50 workers at 200 or more. |
| Maricopa County Environmental Health Code, Ch. II Sec. 6 Reg. 5 | Construction sites need at least 1 toilet per 20 persons, within 200 feet of each work area. |
| OSHA interpretation letter, May 17 2006 | A toilet that is unsanitary or too far away is not "provided." The letter points to ANSI Z4.3, which calls for a unit used by up to 10 people to be serviced at least weekly. |
| Maricopa County Solid Waste Permitting | Portable restroom units made available for use must be permitted by the county. Ask any operator for their county permit. |
Summaries checked against the source on 2026-11-03. Always confirm with your permitting office.
Pricing
We are building a Phoenix Price Index from operator quotes and will publish real ranges here once we have them. Until then, see how pricing works or call for a live quote.
Questions people ask
Who permits holding tanks in Maricopa County?
The county permits portable restroom units and holding tanks made available for use.
Can a holding tank serve a restroom trailer?
Yes, that is a common setup when there is no sewer.
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