Stormwater fee credits · Wales

Welsh Water Surface Water Rebate

Run by Dŵr Cymru Welsh Water

OpenLast checked October 22, 2026
What you get
2026/27 household reduction: £45.87 on the service (standing) charge with a water meter or on the Assessed Measured Charge; £70.30 if billed the standard unmeasured property charge
Maximum
£70.30 per household
Who qualifies
Customers connected to the Welsh Water public sewer who pay sewerage charges and whose surface water, rainwater and groundwater all drain somewhere other than Welsh Water's sewers.
Where
Households connected to Welsh Water's sewers, covering most of Wales.
Status
Open. 2026/27 booklet published.
Type of payment
Fee credit
Official program page

What you do

Show that no rainwater from your property enters the public sewer (for example it drains to a soakaway or stream) and get a reduction in your sewerage charges.

Requirements

  • No surface water, rainwater or groundwater may enter Welsh Water's network; there is no reduction for partial drainage
  • Collecting roof water in a water butt does not qualify because it is not a permanent fixture
  • Harvested rainwater that ends up in the sewer (for example from toilet flushing) rules out the rebate
  • Flats only qualify if the whole building's surface water stays out of the public sewer
  • Customers on HelpU, WaterSure or Welsh Water Assist tariffs see no reduction because surface water is not included in their bill

How to apply

  1. 1Apply online at dwrcymru.com/surfacewater, call 0800 052 0145, or complete the form in the Surface Water Rebate booklet and post it to Dŵr Cymru Welsh Water, PO Box 690, Cardiff, CF3 5WL
  2. 2Say where your surface water goes (for example a soakaway and where it is)
  3. 3Welsh Water will usually visit to confirm the drainage arrangements
  4. 4Keep paying your charges as normal while the application is reviewed

Timing and deadlines

If successful the rebate is applied from 1 April 2021 or from when you started being billed, whichever is later, and to all future charges unless drainage changes.

Sources

Last checked October 22, 2026. See something out of date? Tell us.

Sow is not affiliated with any of these agencies or utilities. Amounts and rules change, often at the start of a fiscal year, so confirm the details on the official page before you start a project. How we research these programs

Free to cite

Quote it with credit and a link to this page. The amounts and rules come from Dŵr Cymru Welsh Water's official page, linked above, so check it before you publish.

Source: Sow, “Welsh Water Surface Water Rebate,” Yard rebates directory, checked October 22, 2026, https://www.usesow.com/rebates/wales/welsh-water-surface-water-rebate

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