Soakaway Testing Water

Soakaway Testing Water Supply

Soakaway testing water

TWS provides water for soakaway/percolation tests across the country, form projects both large and small.

Soakaway test water is a water used onsite at the early stages of a constructions project, for soaraway/percolation testing. In the case of a brownfield site, a water source may already be present, and the specialist contract can gain access to this in order to carry out their operations. However, it is rare too find a Greenfield site with a suitable water supply, and this is where TWS comes in…… Under the Planning Policy Statement 25 (PPS 25), developers are encouraged to use sustainable drainage systems across their projects, with many choosing to undertake a soakaway test to determine the porosity of their ground in order provide information important in the design of their proposed drainage systems. Often, the size or location of an existing onsite water supply is not able to fill the pits quickly enough for a test to be carried out accurately. Therefor assistance is required to fill the pits with water, which should ideally have an audit trail to avoid any contamination issues.

Why use TWS for your soakaway test water?


TWS only supplies water which has been abstracted under licence form the UK’s water utility companies, as opposed to taking water from an untested ground water source, which could potentially contaminate the land you are testing.

We operate a range of vehicles to suit any size of soakaway test, in any location. Our fleet consists of 4×4 vehicles which tow 2000 litre water bowsers, able to go just about anywhere, along with 15-20 000 litre rigid chassis and 30 000 litre articulated tankers for larger projects.

Each soak away test requires the excavation of a trial pit (or pits, depending on the size of the project), filing the trial pit with water and then monitoring and recording the level of the water in each pit at certain time intervals. This will then give an indication of the drainage rate of that particular area. The operation should be carried out three times (in accordance with BRE 365 Soak Away Design). In such cases, TWS will:

  • TWS will attend site for the duration of all three tests.
  • Refill the delivery vehicle locally, if needed.
  • Carry lay flay hose and high capacity pumps, able to deliver water up to 400m+ if required.

Are you looking for a cost effective and reliable water delivery solution for your next soakaway test?  …. if so, please call us now on 0800 0016041 or email