In a catering trailer or food truck, water is often the "silent killer" of operations. When you have it well-managed, no one even notices. When you don't – suddenly you're dealing with non-functional hand washing, a full wastewater tank, low pressure, or hygiene issues at an event.
In this article, you will find a practical overview of:
- which water and wastewater solutions are used in practice,
- how to set up water refilling and wastewater draining,
- how to maintain the system to keep it hygienic and reliable,
- and what to consider during design based on your concept type.
1) How a typical water system works in a catering trailer or food truck
Most mobile businesses operate without a permanent connection to the water supply. Therefore, a combination is used:
- fresh water tank,
- wastewater tank,
- pump (for pressure),
- and as needed, water heating.
This system is particularly practical at events: you can operate even without permanent infrastructure while still maintaining hygiene standards.
2) Our standard (Gastronova) – a proven setup for most concepts
To ensure the system works in practice and isn't "pushed to the limit," we typically design the water system as follows:
- 2 sinks (depending on the concept and hygiene requirements)
- instantaneous water heater or a small 6L boiler (depending on the type of operation)
- pump with a water filter
- 2 × 40 L tanks:
- 1× fresh water tank
- 1× wastewater tank
This setup is universal, easy to service, and sufficient for many concepts if you have a set routine for refilling and draining.
3) Filling water: from the outside into the tank or directly via hose
To make water refilling practical and hygienic, our system is designed so that filling is always done from the outside:
- either you fill the fresh water tank,
- or you have the option of a direct hose connection (when water is available on-site).
This is especially important at events – you don't want to deal with buckets and improvisations, but rather quick refilling without disrupting operations.
Pro tip: use a hose intended for drinking water and store it separately from "technical" hoses (to minimize odor and contamination).
4) Water heating: instantaneous heater vs. 6L boiler
Hot water is often key to hygiene and staff comfort. The most common solutions in a catering trailer or food truck are:
Instantaneous water heater
- advantage: hot water "on demand," without waiting for a tank to heat up
- suitable: when water is used frequently and briefly (hands, quick rinsing)
Small 6L boiler
- advantage: stable water temperature, simple operation
- suitable: when you want to have hot water ready even in fluctuating conditions
Safety tip: with a boiler, always ensure it is filled with water before switching it on.
5) Wastewater: draining via a floor valve (from the outside) or permanent connection
Wastewater comes from hand washing, rinsing, and sanitation. The key is to have a clear and fast way to drain it.
In our trailers, draining is designed so that:
- draining is via a floor valve and is done from the outside,
- and if needed, the system can also be set up for a direct permanent connection (when you have a stable location with a drain).
Advantage of the external valve: you drain the tank without interfering with the interior and without dismantling cabinets.
6) How much water does a catering trailer or food truck actually need?
The most important thing is not just to look at the volume of the tanks, but at the reality of the concept:
- bar / drink concept: water is used for hand washing, rinsing, sanitation
- street food and hot kitchen: higher consumption (tools, work surfaces, hygiene)
- coffee shop: depends on whether you use disposables or wash a lot of dishes
Practical recommendation: set up a simple routine:
- when you refill fresh water (e.g., before the event + halfway through the day),
- when you drain wastewater (e.g., after the event or when full),
- who is responsible for it and where the "service point" is located.
7) Maintenance and "anti-odor" routine
The most common cause of odor isn't the water itself – but a neglected tank, hoses, and residue in the drain.
I recommend:
- regular system flushes (especially after events),
- ongoing filter cleaning,
- not leaving water standing for unnecessarily long periods,
- completely draining and winterizing the system before winter.
Summary and final recommendation (Gastronova)
If you want your catering trailer or food truck to run stress-free, water and wastewater must be designed as thoroughly as the electricity:
- be clear about your concept and operational intensity,
- choose the right water heating method (instantaneous vs. 6L boiler),
- set a refilling and draining routine (an external valve is a game-changer),
- and have a simple maintenance routine so the system doesn't smell and works reliably.
If you want to check out related items:
- Hygiene: https://gastronova.eu/sluzby/hygiena/
- Catering equipment and accessories: https://gastronova.eu/kategoria-produktu/prislusenstvo-hlavne/gastro-vybavenie/
- Concepts: https://gastronova.eu/koncepty/
- Custom catering concept (Streetfood Service): https://gastronova.eu/sluzby/gastro-koncept-na-mieru/
- Financing: https://gastronova.eu/sluzby/financovanie/
FAQ – Water and wastewater in a catering trailer or food truck
1) What is the standard water system in a catering trailer or food truck?
Most commonly, it is a system consisting of a fresh water tank + wastewater tank + pump (pressure) + water heating. The advantage is that you can operate without permanent connections while still maintaining hygiene standards.
2) How many liters of water do I need in a catering trailer or food truck?
It depends on the concept, the number of staff, and whether you wash dishes or use mostly disposables. As a standard, a 2× 40 L tank setup (fresh + waste) is often used, while for higher volume operations, the refilling/draining routine during the day is key.
3) How does water filling work in a catering trailer or food truck?
It is practical and hygienic to have filling from the outside – either into the fresh water tank or via the option of a direct hose connection when water is available on-site.
4) How is wastewater drained from a catering trailer or food truck?
The most practical way is draining via a floor valve operated from the outside. For a stable location, the system can also have a permanent direct connection to the drain.
5) Is an instantaneous water heater or a 6L boiler better?
- An instantaneous water heater is great when you want hot water "on demand" and use it frequently and briefly (hands, quick rinsing).
- A 6L boiler makes sense when you want a stable temperature and a simple reserve of hot water.
6) Why does the water or wastewater in my system smell?
The most common reasons are stagnant water, clogged hoses, a dirty filter, or residue in the drain. A simple routine helps: regular flushing, cleaning filters, and not leaving water standing for too long (especially between events).
7) Can I drain wastewater anywhere?
No. Wastewater should only be drained at designated locations (collection stations, approved drains, back-of-house facilities). Do not drain it in parking lots, into storm drains, or into nature.
8) What is the minimum I should have for hygiene purposes?
Minimum for most concepts: a separate hand wash sink + a sink for dishes/tools.
For concepts involving raw ingredient preparation (vegetables / meat): we recommend considering a separate solution for washing food or a clear time separation and sanitation between activities – to minimize the risk of cross-contamination.
