We’re always being asked the question, whats the difference between clean water and drinking water? We’ve put together a quick blog as guidance for our readers.

Tardis H2O on site offer delivery of two grades of water. Clean water and drinking (also referred to as potable) water.

Both clean and drinking water is drawn from authority licensed potable sources.

All H2O drivers and operatives are *EUSR accredited. *Energy & Utilities Skills Register

The difference between clean and drinking water is as follows:

1) The preparation process followed.
2) The equipment used for delivery and storage.
3) Delivery vessel used.
4) Fittings used to transport water between vessels.
5) Water tests.
6) Cleaning and chlorination process.

Clean water
Clean water is taken from a potable source and loaded onto a tanker suitable for delivery of clean water only. Tankers used for clean water delivery can be constructed from mild steel, which means the water is only suitable and intended for hand washing and other welfare facilities.

Water pipes used for delivering clean water are not *WRAS Approved (*Water Regulation Advisory Scheme). Therefore, the water travelling through these pipes are not classed as fit for human consumption. We do make sure these pipes are chlorinated before any fill is carried out.

Water Tanker

Drinking water
Drinking water is also taken from a potable source, but in this case our drinking water tankers are constructed from stainless steel 316L, which is of food grade standard and recognised by the *DWI (*Drinking Water Inspectorate) and WRAS. This also includes the pumping system.

All drinking water tankers are prepped to strict hygiene standards prior to delivery of drinking water.

The process followed for delivering drinking water is as follows:

1) All residual water is drained from the tanker barrel.

2) Sight glass is removed, cleaned and replaced.

3) Tanker is then fully jet washed internally.

4) All internal tank walls are sprayed with a Chlorine solution.

5) Pre-flush fill takes place (this is to ensure any debris is removed from the tanker).

6) Dechlorinate water n the tanker before dumping to drain.

7) Internal walls are jet washed without entering the tanker chamber.

8) The tanker is parked at the location of the potable source.

9) All fixtures and fittings are chlorinated. All fittings and pipework will be stainless steel and WRAS approved.

10) The line is flushed through before connecting to tanker.

11) The tanker is connected to the licenced fill point.

12) The fitting is re-chlorinated and attached to the tanker and filling commences.

Again, all fixtures, fittings and pipework will be stainless steel and WRAS approved.

13) Once filling is complete the water is tested and results recorded.

14) If there are discrepancies recorded within the test the same process is repeated.

Upon arrival, the driver will check if the storage tank at site is suitable for holding drinking water, checking that fittings are WRAS approved? And pipework appropriate for drinking water?

If the storage tank is fit for drinking water, the driver will commence the fill. Once the fill is complete, the driver will re-test the water in the storage tank and confirm water is good for wholesome water suitable for drinking.

Water Testing Apparatus

If the storage tank on site is not suitable for holding drinking water, the driver will make the site management aware that although the supply from the tanker is drinking water it will be classed as clean water once offloaded into the non-approved storage tank.

Drinking water should be tested every 24 hours as stated in the British Standard BS8551:2015.

If you require any further information, call our friendly team on the usual freephone number 0800 731 0589.


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