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Glossary

Slurry

What is Slurry?

Slurry is the fluid mixture of water and excavated soil produced during hydro excavation; the vacuum draws this slurry from the dig site into the truck's debris body for transport and disposal.

Slurry forms when pressurized water breaks up soil into a pumpable, mud-like mixture. Instead of lifting solid spoils, the hydrovac vacuum suctions the slurry through the dig tube into the debris body, keeping the work area cleaner and the excavation precise.

Slurry volume and consistency depend on soil type and water use, and the debris body must be sized to hold it before offloading at an approved site. Frozen or clay-heavy ground can change how much water is needed to keep spoils flowing. Rent hydro excavation equipment matched to your soil conditions through a free Vac4Rent request.

Guides that cover Slurry

Related terms

SpoilsDebris BodyHydro ExcavationOffloading

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Slurry: common questions

What is Slurry?+

Slurry is the fluid mixture of water and excavated soil produced during hydro excavation; the vacuum draws this slurry from the dig site into the truck's debris body for transport and disposal.

Can hydrovac slurry be dumped on site or into a storm drain?+

Generally no. Slurry carries sediment and sometimes contaminants, and releasing it into storm drains, ditches, or waterways can violate federal Clean Water Act requirements as well as state and local stormwater rules. It is normally hauled in the debris body to a facility or site approved to accept it. Some jurisdictions allow on-site decanting of water under specific conditions, so check local requirements before assuming any release is permitted.

How can crews reduce the amount of slurry a hydrovac job produces?+

Using only as much water as needed to break the soil keeps slurry volume down, which means fewer trips to offload. In suitable dry, loose soils, air excavation can be an alternative that produces dry spoils instead of slurry. Planning the dig pattern, keeping holes tight, and choosing a unit with enough debris capacity for the job also help. Where local rules permit, decanting separated water can extend time between disposal runs.

Does freezing weather cause problems with hydrovac slurry?+

It can. In freezing conditions, water and slurry can freeze in the tank, pumps, lines, wand, and debris body, making digging and offloading harder. Many hydrovac units built for winter work include water heaters and heated compartments that keep water flowing and help cut frozen ground. If you are digging in cold months, in places like Denver, Colorado, ask the rental company whether the unit has a cold-weather package and how it should be drained or stored overnight.