Setting up your Direct Debit

The quickest way to set up a Direct Debit on your account is via our customer portal.

If you don't already have a login, it's quick and easy to register.

  • Take paying bills off your 'To Do' list
  • Regular Direct Debit payments help to manage cash flow
  • Direct Debit payments are covered by the Direct Debit Guarantee
  • Direct Debits help to avoid late payment charges

Make sure you have your bank details and an up-to-date invoice to hand, and also ensure you are logged in to access the form.

Set up Direct Debit

If you can't complete your Direct Debit online or need a paper mandate? Click here.

The easiest way to pay your bill is by Direct Debit.

We’ll work out how much you’ll need to pay each month based on how much water you’re likely to use. At times, you’ll be in credit or debit. But we’ll review your payments each year to make sure you’re paying the right amount and let you know if your payments need to change. When you pay by Direct Debit, you'll be covered by the Direct Debit Guarantee.

How we calculate your monthly Direct Debit

With a Direct Debit in place, you don’t need to worry about your payments. If your supply is metered, we will review your monthly payments every six months to make sure you are paying the right amount.

When you choose to pay by monthly Direct Debit you avoid paying a lump sum twice each year. We calculate your bills and check your account every six months to understand how your consumption is affecting your charges. If you are on course to build up a credit balance, we will reduce your monthly payments; and if you are on course to build up a debit balance, we will increase your monthly payments to make sure you don’t have to pay a lump sum at a later date. We will always write to you to give 10 working days’ notice before your monthly payments change. Find out more about how we calculate your Direct Debit.

Paper Direct Debit mandate forms

If you are not the account holder and require a Direct Debit to be setup, please complete a paper mandate. Click here for the England customer paper mandate, and click here for the Scotland customer paper mandate.

Customers in England should send the completed mandate by email to or by post to Castle Water Limited, 1 Boat Brae, Blairgowrie, Perthshire, PH10 7BH.

Customers in Scotland should send the completed mandate by email to or by post to Castle Water Limited, Lismore House, 32 Miller Road, Ayr, Scotland, KA7 2AY.

Cancelling your Direct Debit

If you want to cancel your Direct Debit, simply take a meter reading and contact us. We’ll use your reading to update your account. We’ll also discuss how you’d like to pay your bills in future. If you’ve got a debit balance on your account but you don’t want to set up a payment plan, you’ll need to pay the balance in full.

If you’re changing to another supplier, you can cancel your Direct Debit at any time by simply contacting your bank or building society. Written confirmation may be required.  We’ll refund any credit back to you or take a one-off payment for the balance when you get your final bill.

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