This guide is for a site manager, facility manager or property owner whose septic tank or site toilets are filling up. The supplier cannot see your tank from the phone, so a good vacuum truck hire booking describes it. Below: what to say, where the truck may stand, what proof to ask for and which safety rules to keep.
What does a vacuum truck do?
A vacuum truck has a sealed tank and a vacuum pump. The pump draws liquid and sludge through a hose into the tank. Many people call it a sewage tanker or a septic tanker.
Some units also carry a high-pressure water jet. The jet cleans blocked drain lines and pipes. If you need line cleaning as well as emptying, say so when you book, because not every truck has the jet.
This is a different job from a water tanker, which delivers clean water. If you also need water on site, see water tanker hire for construction sites. You can browse trucks in the vacuum trucks category.
What exactly needs to be removed?
Name the material in plain words. Most bookings are one of these:
| What you have | What to tell the supplier |
|---|---|
| Septic tank or soak-away pit | Domestic sewage and sludge; how long since the last emptying |
| Site toilet block or cabin tank | Waste from site workers; how many people use it |
| Blocked drain or sewer line | That you need line cleaning, and whether there is standing water |
| Anything else | The exact liquid, and what it came from |
A sewage tanker is meant for ordinary domestic or site sewage. If the liquid is industrial, chemical or oily, say so at the start and let the supplier decide. It may need a different supplier with different equipment, and a wrong answer on the phone wastes a trip.
What should you tell the supplier about the tank and access?
The truck has a limited hose length and a limited suction depth. So the supplier needs facts about the tank and the way in, not just the address.
Give these details:
- Type of tank: septic tank, soak-away, holding tank, or a toilet block tank.
- Cover position: where the inspection cover is, and whether it is buried or hard to find.
- Approximate size and depth: a rough volume and how deep the liquid sits below the cover.
- Distance: how far the truck must stand from the cover.
- Access route: gate width, any low cables or branches, and the surface of the track.
- Contact: a person on site who can open the gate and point to the cover.
Send two photos: one of the cover and one of the route to it. Photos answer more questions than a long call.
For example, a short message could read: "Septic tank behind the villa, cover under the paving, about two metres deep. Truck must stand at the side gate, roughly 15 metres from the cover. Domestic sewage only. Last emptied about a year ago. Photos attached."
Tip. If you do not know the depth, say so. A supplier would rather hear "not sure, about two metres to the cover" than a confident wrong number.
Where can the truck stand safely?
Do not park a heavy truck on or directly beside a septic tank or its cover. The ground above a tank may not carry a vehicle's weight. A cover or roof slab can crack, and a truck can sink or tip into the tank.
Pick a firm, level spot on solid ground, away from the tank edge. Then work out the hose run from there. If the cover is farther than the hose reaches, the truck cannot do the job from that spot.
Common mistake: the owner expects the truck to drive right up to the cover. Fix: mark the cover, mark the safe standing place, and measure or pace the distance between them before you call.
Also check three things: the standing place is level, the ground is firm after rain or watering, and there is room to turn without a long reverse.
If the access is poor, tell the supplier early. They may send a smaller truck or a longer hose.
Where does the waste go, and what proof should you ask for?
Ask the supplier where the collected waste will be taken and whether that disposal point is authorised to receive it. Then ask whether they can give a record of disposal for the job. Requirements differ by municipality and site owner, so confirm what your project requires before the truck arrives.
On a site, the client or site owner may ask for the record. A property owner should still know the waste went to an authorised disposal point and was not dumped.
Questions to ask the supplier:
- Where will the waste be taken after collection, and is that point authorised for it?
- Can you give a written record of disposal for this job?
- Who from the crew will be on site, and what do they need from us?
- Does the truck carry a jet if we need line cleaning?
What are the safety rules around septic tanks?
A septic tank can hold dangerous gases and low oxygen. These cannot be seen, and the smell is not a reliable warning. For that reason nobody from the site should lean into a tank or enter it. Leave opening and emptying to the supplier's crew, who should follow their own safe-work procedure.
On site, keep these simple rules:
- Keep people, children and animals away from the tank area while work is going on.
- Do not open the cover yourself before the crew arrives.
- Keep naked flames, cigarettes and sparks away from the tank.
- Stay clear of the hose and of the truck while it works.
- If someone feels dizzy, faint or unwell near the tank, move everyone away into fresh air and call the emergency services. Do not go in after them.
Note. Your site owner or insurer may have extra rules for this kind of work. Ask what they are before the job.
How often should portable toilets and tanks be emptied?
There is no one interval that fits every site. It depends on how many people use the toilets, how many hours they work and the size of the tank. More workers on the same units means more frequent servicing.
Agree the service interval with the supplier based on the number of people using the toilets. Then ask them to adjust it if the crew grows. Plan toilet servicing together with any septic tank emptying, so one booking covers both.
A holding tank or cesspit that is full is overdue for emptying. A septic tank can also be due when sludge builds up. Slow drains, bad smells and water backing up are signs to book now, not next week. Planning a new site? Put toilets and waste removal into your site setup checklist. If welfare cabins are on the list too, see portable cabins versus containers.
How to do this on Maedah
Post one request for the vacuum truck. If you need toilets too, add portable toilets to the same request.
In the request, put the city and site on the map, the date, what is being removed, the tank details and the access route. Add photos of the cover and the access, or send them to the supplier in the quote chat. See what to write in an equipment rental request for a general checklist.
Suppliers send sealed quotes that line up side by side. Compare what each includes, such as line cleaning or a record of disposal. Agree the price and payment with the supplier directly.
