WA postcode district map, Warrington

Where the WA districts sit

3 districts are plotted without a label where labels would overlap; every one is in the table below.

Where WA sits

It is administratively fragmented, reaching into Warrington, St. Helens, Cheshire West and Chester and Halton and 4 other authorities.

Water supply across WA

All 18 WA districts are supplied by United Utilities. That makes WA simple in a way many areas are not: one company, one set of rules, one status to check.

No hosepipe ban currently applies anywhere in WA.

The shape of the WA area

The districts are wildly uneven: WA8 holds 1,589 postcodes around Widnes and WA55 holds 8, a ratio of about 199 to one. They divide into 95 sectors.

The numbering is not continuous. WA runs up to 88 but has only 18 districts, so 70 numbers are unused:.

Several districts share a settlement, which is a common source of confusion when a form rejects an address: WA1, WA2, WA4, WA5 and WA55 all point at Warrington, WA8 and WA88 all point at Widnes and WA9 and WA10 all point at St Helens.

What borders WA

WA sits next to M (Manchester) to the north east, WN (Wigan) to the north, BL (Bolton) to the north, L (Liverpool) to the north west and CW (Crewe) to the south.

Its neighbours run in 4 different directions, so WA is landlocked by other postcode areas on most sides.

WA districts, settlements and water supply

Principal settlement is the town or city each district sits in or nearest to, derived from OS Open Names. It is not the Royal Mail post town, which is licensed data and not published openly. Status is resolved live from each company’s own notice.

Water hardness in WA

No water company covering WA publishes hardness figures as open data. The gap is named per district below so you know who to ask.

United Utilities does not publish hardness as open data, but does publish a water hardness factsheet with a full band table and a postcode water quality checker.

Hardness is published per census area, not per postcode, so these figures characterise a district rather than measuring one address. They are a scale and taste matter, not a safety one. Hardness data version wessex-water@2022-2025+yorkshire-water@2026.

Download the WA data

No signup, no email wall. GeoJSON carries the district points, the supplier and the live status, so it can be dropped straight into a map.

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District positions are averaged postcode centroids from OS Code-Point Open. They show roughly where a district sits, not where its boundary runs, and are not legal boundaries.

Frequently asked questions