Coffee Cart Water Requirements: A Verified State-by-State Reference

A cart owner walking an inspector through the water system. The tank conversation decides what cart you can legally buy.

This page covers nine states: Washington, Oregon, California, Idaho, Nevada, Utah, Arizona, Colorado and Texas. Every figure in it was read out of the regulation itself, not out of a summary of the regulation.

We built it after a customer question sent us looking for a straight answer, and we could not find one. What we found instead was that a fair amount of what gets published about coffee cart water rules is wrong. Your county health department is always the final authority, and this page exists to tell you what to ask them.

Last reviewed: July 2026.

What We Found When We Checked

We started with fifteen states. For each one we pulled the actual health department document or administrative code and read it.

Three of the states we verified had a specific, confident, widely published number that does not appear in the regulation at all.

Texas

Multiple sites state that Texas requires a 20 to 30 gallon fresh water tank and a wastewater tank no smaller than 40 gallons. The Texas Department of State Health Services guidance for mobile food units, which cites its rule numbers throughout, contains neither figure. Texas sets no gallon minimum. It requires a waste tank 15 percent larger than the potable tank, and a water supply that "must meet the demands of the operation."

Georgia

A commonly repeated formula says Georgia sets a 15 gallon baseline for handwashing and warewashing combined, plus one gallon for every linear foot of service window. We read all 54 pages of the Georgia Department of Public Health manual covering special food service operations. The formula is not in it. Georgia requires tank capacity calculations sufficient to meet demand for at least one day of operation, which is a different kind of rule entirely.

Colorado

A figure in circulation says Colorado requires 10 gallons, or 3 gallons per hour of operation, whichever is greater. The regulation says something narrower: pushcart water supply tanks need a minimum of 5 gallons, and hand sinks specifically need 3 gallons of water per hour of operation.

We are not naming the sites. The point is not that anyone was dishonest. Most of these figures look like a real requirement that got generalized, or a county rule that got promoted to a state rule somewhere along the way. The point is that you cannot build a cart against a number you found in a blog post, including this one, without checking it against your own jurisdiction.

That is a quarter of the states we verified. It is why every row below carries a link to the document we read.

Who Actually Sets Your Water Rules

"State by state" is partly a fiction, and nobody tells you that before you start searching.

Some states publish one rulebook that applies everywhere in them. Oregon is the cleanest example: the Oregon Health Authority publishes a mobile unit guide with the numbers in it, and that is the answer statewide.

Some states set the numbers in statute and then leave interpretation to the county. California is the clearest case. The gallon figures sit in state law, but whether your cart counts as a limited food preparation operation is a county determination, and that classification changes the requirement substantially.

Some states set a floor and let counties build on it. Washington works this way. The state code gives you a minimum, and your county administers plan review and can require more.

So a person searching for a state answer in California or Washington is looking for something that only half exists. The state gives you the baseline. The county gives you the number you actually build to.

Practical Consequence

The fastest route to a real answer is your county environmental health division, not your state health department. Use this page to know what to ask and roughly what to expect. Use the phone call to get the number you build against.

The Rule That Holds Almost Everywhere, and the One State It Does Not

California requires roughly four times the federal waste ratio once the beverage clause applies. Source: California Retail Food Code 114240.

There is one figure you can carry into any conversation.

Your waste tank has to be bigger than your fresh tank, by 15 percent.

This comes from the FDA Food Code, which is a model that states adopt rather than a law in itself. We verified it directly in eight of the nine states here: Washington, Oregon, Texas, Arizona, Utah, Nevada, Colorado and Idaho. It typically comes with two companions: the waste tank drains through an opening at least one inch in diameter, and that drain has a shut-off valve.

The logic is simple. Everything that goes into your cart has to come back out, plus whatever you put in the handwash sink, and a waste tank the same size as your fresh tank overflows before the fresh tank empties.

California is the exception, and it is a large one.

The California Retail Food Code, section 114240, requires wastewater capacity 50 percent greater than the potable water tanks, never less than 7.5 gallons. More than three times the federal model.

Then it adds two things most guidance leaves out entirely.

> "Where POTABLE WATER for the preparation of a FOOD or BEVERAGE is supplied, an additional wastewater tank capacity equal to at least 15 percent of the water supply shall be provided."

An espresso cart is supplying potable water for the preparation of a beverage. So a California cart is looking at 50 percent plus another 15 percent, roughly 65 percent more waste capacity than fresh.

> "Where ice is utilized in the storage, display, or service of FOOD or BEVERAGEs, an additional minimum wastewater holding tank shall be provided with a capacity equal to one-third of the volume of the ice cabinet to accommodate the drainage of ice melt."

If you sell iced drinks in California, your ice cabinet generates its own wastewater requirement. We have not seen this mentioned in any guide to starting a coffee cart, and iced drinks are a growing share of what carts sell.

Why Coffee Carts Are Not Food Trucks for Water

Most mobile food guidance is written for a kitchen on wheels. A coffee cart has a different water profile: far less dishwashing, far more rinse and steam volume, and a machine that draws water continuously through a rush.

Two states have written that difference into their rules.

Colorado Names Espresso Machines Directly

From the state's retail food establishment rules:

> "Where other water using fixtures such as toilets, utility sinks, food preparation sinks, coffee, espresso and soft drink machines are provided, the water supply shall be sized in accordance with the manufacturer's specification for each fixture."

Colorado tells you to size your water supply to your espresso machine's specification. That is the correct answer, and it is one a general food truck guide cannot give you.

California's beverage clause, quoted in full above, does the same thing from the wastewater side.

The question that moves your number most is not which state you are in. It is how your operation gets classified. Four of the nine states run a classification system, and the classification changes the requirement more than crossing a state line does:

• Oregon sorts units into Classes I to IV. Whether a dishwashing sink is required at all depends on your class.

• Arizona uses Types I to III, with different water and handwashing requirements for each.

• Utah writes separate figures for a food cart and a food truck: 10 gallons against 30.

• California distinguishes limited food preparation from full preparation.

Two states go further and exempt carts from the three-compartment sink under conditions. Idaho states that with the exception of mobile carts, all mobile establishments must have one. North Carolina, which is outside this table but which we verified, allows the equipment sink to be omitted where no food is prepared on the unit and all utensils are cleaned at the commissary.

So Ask Your Inspector This, First

Does making espresso count as food preparation here, and what class or type does that put me in? For a coffee cart that single answer moves more than any other.

When you have it, our water pump systems are sized against real draw rather than tank size, and we have written the plumbing side up separately in our guide to designing a cart water system.

Requirements by State

Every figure below was read from the linked document. Fresh water requirements are given in each state's own framing, since the nine states express them in five incompatible ways and flattening them into one number would be misleading.

Sources

Washington WAC 246-215 · Oregon Mobile Unit Operation Guide · California Retail Food Code 114240 · Southeastern Idaho Public Health · Southern Nevada Health District 2023 Food Regulations · Utah Admin Code R392-102-7 · Arizona Admin Code R9-8-110 · Colorado 6 CCR 1010-2 · Texas DSHS Pub 23-15129

Notes worth knowing per state

Washington

The 5 gallon figure is a floor, not a target. What actually drives your capacity is the sink-sizing language, which requires compartments large enough to submerge the equipment you use. The tank inlet must be three-quarters of an inch or smaller.

Oregon

Your class decides almost everything. Class I needs no water supply at all. Class III triggers dishwashing sinks or a licensed commissary. Ask which class an espresso cart falls into before you build. Plan review with your local environmental health department is required before licensing.

California

The strictest waste requirements of the nine, and the only state that writes ice melt into the calculation. The water heater must reach at least 120°F where water is used for anything beyond handwashing.

Idaho

The widely quoted 30 gallon figure is advisory. The document says a minimum of 30 gallons is "generally recommended for a standard mobile" and that more may be required. What is required is the 15 percent waste tank, a dedicated handwash sink with hot and cold running water, and a written wastewater disposal plan kept with the unit. Idaho separately requires that lines and tanks be heat taped for winter operation.

Nevada

Fresh and waste tanks must be built as an integral part of the unit and are prohibited from sitting on the ground. Permanent utility hookups are not allowed.

Utah

The only state in this set that writes a lower requirement for a cart than for a truck, measured down from the tank inlet.

Arizona

A Type I unit selling open food needs a catch bucket for handwash wastewater sized 15 percent greater than the potable tank. Handwashing flow rate has a half gallon per minute minimum.

Colorado

Beyond the espresso clause, hand sinks need 3 gallons per hour of operation at 100°F, and the warewashing sink supply must fill it at least once every four hours of operation. Minimum flow rate of one gallon per minute at all fixtures.

Texas

No gallon minimum anywhere in the rule. Waste connections must differ in size and type from potable connections, and the waste tank must be labeled.

How to Confirm Your Own Requirements in One Phone Call

The water path every one of these rules is written about. Example figures. Confirm required capacity with your county.

Call your county environmental health division. Ask these, and write down what you hear.

1. Does making espresso count as food preparation here, and what class or type does that put me in? Ask this first. It changes more than anything else on the list.

2. What fresh water capacity do you require, and how do you want it calculated?

3. What waste capacity relative to fresh?

4. Do I need a dedicated handwash sink, and at what water temperature?

5. Do I need a three-compartment sink on the unit, or can utensils be washed at a commissary?

6. Am I required to operate from a commissary, and does it need to be licensed?

7. Is plan review required before I purchase, what drawings do you want, and what is your current turnaround?

Get the tank answers in writing if you can. They determine what cart you can buy, and a cart bought before that conversation is the most expensive mistake in this business.

What This Page Does Not Cover

Nine states, not fifty. We started with fifteen and published the nine we could verify against a primary document.

Florida, Maryland, Illinois and Tennessee are not here. Two of those had documents we could not reliably access, one appears to have no state-level baseline, and one we could not confirm from any primary source. Florida is first in line when we extend this.

We would rather show you nine states we checked than fifty we assembled. If your state is missing and you want it added, tell us and we will prioritize it.

Frequently Asked Questions

How much water does a coffee cart need?

It depends on your state and your classification, and the nine states here express it five different ways. Utah sets 10 gallons for a cart. Washington and Arizona set 5 gallon floors. Oregon itemizes 30 for dishwashing plus 5 for handwashing. Colorado sets a per-hour rate. Texas sets no number and requires the supply meet the demands of your operation.

Does a coffee cart waste tank have to be bigger than the fresh tank?

Yes, essentially everywhere. The FDA Food Code sets waste capacity at 15 percent larger than fresh, and most states adopt it directly. California is the significant exception at 50 percent greater, with a further 15 percent where water is used to prepare a beverage and extra capacity for ice melt.

Do I need a three-compartment sink on a coffee cart?

It depends on classification rather than geography. Idaho exempts mobile carts. North Carolina allows the equipment sink to be omitted where no food is prepared on the unit and utensils are cleaned at the commissary. Oregon ties it to your class. Ask your county directly.

Does a coffee cart need a commissary?

In all nine states here, yes in some form, though the conditions vary. Some states waive it where the unit is fully self-contained with its own water, wastewater, refrigeration and warewashing. Others require a daily visit regardless.

Are coffee cart water rules set by the state or the county?

Both, and the mix varies. Oregon publishes centrally. California sets numbers in statute and leaves classification to the county. Washington sets a baseline the counties build on. Your county is the authority in every case.