Anglian Water DWI Enforcement Action: What It Means for Your Household
What happened
The Drinking Water Inspectorate (DWI) served Anglian Water Services Limited with a formal Regulation 28(4) notice on 8 September 2026, requiring the company to investigate and fix discolouration risks across 16 public water supply zones, according to the DWI's own published notice (reference ANH-2026-00001). The notice covers five hazardous parameters linked to discolouration: iron, turbidity, manganese, aluminium, and discolouration itself. Trade publication Water Magazine reported on the notice on 11 September 2026, noting it followed reports Anglian Water submitted to the DWI between September 2025 and August 2026.
Who is affected
According to the DWI notice, 16 public water supply zones across the Anglian Water region are covered, including Barrowby, Braintree South, Fakenham, Harpswell, Hillington, Holbeach, Hunstanton, Kirby Cane, Mablethorpe, Northampton East, Pettistree, Raydon/Alton, Sandringham, Sleaford, Stamford, and Throston. The DWI has not published individual household or property counts for these zones.
What you can and can't do
This is a regulatory improvement notice rather than a boil-water or do-not-drink instruction, and the DWI notice does not tell customers in the affected zones to take any specific action with their tap water. Anyone experiencing discoloured water should still report it to Anglian Water directly and can request advice on running taps to clear it, per the company's own customer guidance; WaterReady has not seen a specific customer-facing advisory published alongside this notice.
How long it's expected to last
As of 8 September 2026, the DWI notice sets a long compliance timetable rather than a single end date: Anglian Water must complete root-cause analysis methodology by 30 November 2026, submit a company-wide discolouration strategy by 31 March 2027, and reach target discolouration contact rates by 31 March 2030, with a final completion report due by 30 April 2031, according to the DWI notice's own compliance schedule.
Compensation
Neither the DWI notice nor the Water Magazine report on it mentions any customer compensation or redress scheme tied to this notice — as of publication, WaterReady has not found a sourced compensation figure for affected customers and is not estimating one. Customers who believe they are entitled to a rebate under Anglian Water's Guaranteed Standards of Service should contact Anglian Water directly.
Worth having in if your water isn’t safe to drink
Not sure how much water you'd need if this happened to you?
Use our free calculator to work out exactly how many litres your household should have on hand, based on who's in it and how many days you'd want to cover.
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Water cut-offs, boil water notices, hosepipe bans, power cuts, floods and frozen pipes, plus your own emergency contacts and kit checklist, in one fillable PDF based on official UK guidance.
See the binder →Preparing generally, not just for this incident
Whatever your own supplier and circumstances, the same basics apply: knowing how much to store, how to store it safely, and what to do if your supply is ever cut off.
Read our full guide to water supply interruptions →- Drinking Water Inspectorate — Anglian Water Services Limited, Discolouration notice ANH-2026-00001, 8 September 2026
- Water Magazine — "DWI orders Anglian Water to tackle discolouration risks across 16 supply zones", 11 September 2026
Minimum requirements for all
x140 Kirkland Water (500ml)
Drinking
Purpose: cover your minimum drinking-water gap without a large storage footprint. 140 x 500ml bottles of natural spring water.
Inpress Plastics 5L Water Container
Drinking
Purpose: efficient storage for larger gaps with limited cupboard space. Empty, refillable 5L container, food-quality polyethylene, rectangular shape for efficient stacking.
x10 Vira Safe Hand Sanitiser (500ml)
Hygiene
Purpose: basic hygiene cover when water is limited, per government guidance. 70% alcohol, UK-made, contains Vitamin E and Aloe Vera.