If your business has a site in Scotland then switching water supplier is allowed and you can benefit from lower prices. If you are based in England then up until next year you can’t procure water unless you use more than 5ML per year. Previously the threshold was 50ML but this was reduced in 2005 and set to be reduced again in 2017.
The benefit of switching your water supplier is similar to that of gas and electricity. You will be entitled to competitive pricing, improved customer service, supply all from one company (if you have multi-sites) and making only one monthly payment for your water.