# The Sinks and Dish Machine Your Health Inspector Requires Before You Open

> A dish machine does not replace the three-compartment sink, and the handwashing sink is separate from both. The plumbing and equipment a commercial kitchen must have, and the hidden booster-heater cost, cited to the FDA Food Code.

Updated: 2026-09-11. Source: KitchenRisk — https://kitchenrisk.com/guides/sinks-and-dish-machine-inspector-requires/ (claims cited to primary sources; see /methodology/).

Short answer: a commercial kitchen needs a three-compartment warewashing sink, at least one dedicated handwashing sink, and, if it runs a high-temp dish machine, a booster heater to hit the sanitizing rinse temperature. First-timers routinely under-plumb, assume a dish machine cancels the three-comp sink, or forget the booster. Each is a fixed cost the health inspector checks. Here is what the FDA Food Code actually requires.

## The three-compartment sink (a dish machine does not replace it)

FDA Food Code 2022, §4-301.12(A):

> "Except as specified in (C) of this section, a sink with at least 3 compartments shall be provided for manually washing, rinsing, and sanitizing equipment and utensils."

The three-comp sink is the manual wash-rinse-sanitize line, and it is required whether or not you also install a dish machine. Buyers who plan around "the dish machine handles it" get sent back to add plumbing before opening.

## A dedicated handwashing sink (separate from everything else)

§5-203.11(A) requires a handwashing sink that is not the prep sink or a warewashing compartment:

> "at least 1 handwashing sink, a number of handwashing sinks necessary for their convenient use by employees in areas specified under 5-204.11, and not fewer than the number of handwashing sinks required by law shall be provided."

So the minimum sink count is three fixtures doing three different jobs: the three-comp warewashing sink, a handwashing sink, and (in most builds) a separate food-prep sink. Under-counting here is one of the most common first-open failures.

The handwashing sink also has to deliver the right water the right way. §5-202.12 sets both:

> "A HANDWASHING SINK shall be equipped to provide water at a temperature of at least 29.4°C (85°F) through a mixing valve or combination faucet." … "A self-closing, slow-closing, or metering faucet shall provide a flow of water for at least 15 seconds without the need to reactivate the faucet." — FDA Food Code 2022, §5-202.12(A), (C)

In practice that rules out a cold-only tap and a spring faucet you have to keep pressing, an inherited handwash sink that fails either test is a plumbing bill before you can open.

## The dish machine and its hidden booster heater

If you go high-temp (hot-water sanitizing) rather than low-temp (chemical), the final rinse has to reach a real temperature. §4-501.112(A):

> "in a mechanical operation, the temperature of the fresh hot water sanitizing rinse as it enters the manifold may not be more than 90°C (194°F), or less than: (1) For a stationary rack, single temperature machine, 74°C (165°F); or (2) For all other machines, 82°C (180°F)."

Hitting a 180°F final rinse almost always means a booster heater, an extra piece of equipment and a real electrical load buyers forget to budget. A low-temp chemical-sanitizing machine avoids the booster but adds ongoing sanitizer cost. That trade-off is worth pricing before you buy the machine, not after.

## California writes the same numbers into its own code

States that run their own retail food code instead of adopting the FDA Food Code by reference land on the same requirements. California is the clearest example:

> "Handwashing facilities shall be equipped to provide warm water under pressure for a minimum of 15 seconds through a mixing valve or combination faucet." … "the temperature of the water shall be at least 100°F, but not greater than 108°F." — California Health & Safety Code §113953

> "Manual warewashing sinks, except as specified in subdivision (c), shall have at least three compartments with two integral metal drainboards for manually washing, rinsing, and sanitizing equipment and utensils." — California Health & Safety Code §114099(a)

Note California's two required drainboards, a used three-bay sink with no drainboards may still be short of code in that state. Wherever you are, confirm the current edition with your local health department; the numbers above are the near-universal baseline.

Match a used dish machine (high-temp vs low-temp, booster included or not) against its documented failure modes and parts before you buy: [browse the model records](/brands/). And confirm the equipment itself is certified before it goes in, see [why you can't use a home fridge in a commercial kitchen](/guides/why-you-cant-use-a-home-fridge-commercial-kitchen/).