HA postcode district map, Bushey
Supplier statuses last checked .
The HA postcode area covers 10 districts and 10,255 live postcodes, from HA0 to HA9. It is centred on Bushey and also covers Rickmansworth and Borehamwood.
It is a dense area by postcode standards: an average of 1,026 postcodes per district,.
Where the HA districts sit
Where HA sits
The whole area sits inside Greater London, which is unusual at this size.
Water supply across HA
All 10 HA districts are supplied by Affinity Water. That makes HA simple in a way many areas are not: one company, one set of rules, one status to check.
Affinity Water has a hosepipe ban in force from 11 July 2026, covering the whole of HA.
The shape of the HA area
HA8 is the largest district with 1,402 postcodes around Borehamwood, and HA6 the smallest with 721. The area divides into 57 postcode sectors.
District by district: HA0 serves Bushey, HA1 serves Bushey, HA2 serves Bushey, HA3 serves Bushey, HA4 serves Rickmansworth, HA5 serves Bushey, HA6 serves Rickmansworth, HA7 serves Bushey, HA8 serves Borehamwood and HA9 serves Bushey.
Several districts share a settlement, which is a common source of confusion when a form rejects an address: HA0, HA1, HA2, HA3, HA5, HA7 and HA9 all point at Bushey and HA4 and HA6 all point at Rickmansworth.
What borders HA
HA sits next to UB (Ashford) to the south west, WD (Rickmansworth) to the north, NW (London) to the east, W (London) to the south east and N (City of London) to the east.
Its neighbours run in 4 different directions, so HA is landlocked by other postcode areas on most sides.
HA districts, settlements and water supply
| District | Principal settlement | Water company | Hosepipe ban status |
|---|---|---|---|
| HA0 | Bushey | Affinity Water / Thames Water | Ban in force |
| HA1 | Bushey | Affinity Water / Thames Water | Ban in force |
| HA2 | Bushey | Affinity Water / Thames Water | Ban in force |
| HA3 | Bushey | Affinity Water / Thames Water | Ban in force |
| HA4 | Rickmansworth | Affinity Water / Thames Water | Ban in force |
| HA5 | Bushey | Affinity Water / Thames Water | Ban in force |
| HA6 | Rickmansworth | Affinity Water / Thames Water | Ban in force |
| HA7 | Bushey | Affinity Water / Thames Water | Ban in force |
| HA8 | Borehamwood | Affinity Water / Thames Water | Ban in force |
| HA9 | Bushey | Affinity Water / Thames Water | Ban in force |
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 HA
No water company covering HA publishes hardness figures as open data. The gap is named per district below so you know who to ask.
| District | Hardness | As published | Supply zone | Published by |
|---|---|---|---|---|
| HA0 | Not published by Affinity Water. Check with your supplier. | |||
| HA1 | Not published by Affinity Water. Check with your supplier. | |||
| HA2 | Not published by Affinity Water. Check with your supplier. | |||
| HA3 | Not published by Affinity Water. Check with your supplier. | |||
| HA4 | Not published by Affinity Water. Check with your supplier. | |||
| HA5 | Not published by Affinity Water. Check with your supplier. | |||
| HA6 | Not published by Affinity Water. Check with your supplier. | |||
| HA7 | Not published by Affinity Water. Check with your supplier. | |||
| HA8 | Not published by Affinity Water. Check with your supplier. | |||
| HA9 | Not published by Affinity Water. Check with your supplier. | |||
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 HA 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.
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
How many postcode districts are in the HA area?
There are 10 HA postcode districts, running from HA0 to HA9, and they contain 10,255 live postcodes across 57 sectors.
What towns does the HA postcode area cover?
HA covers Bushey, Rickmansworth and Borehamwood. The area takes its name from Bushey, and each district is listed with its settlement in the table on this page.
Which water company supplies HA postcodes?
Affinity Water supplies all 10 HA districts. Supply boundaries follow the pipe network rather than postcode geography, so confirm against your water bill if you are near the edge of the area.
Why do HA0 and HA1 both say Bushey?
HA0, HA1, HA2, HA3, HA5, HA7 and HA9 all serve Bushey, covering different parts of it. A single town routinely needs more than one postcode district once it passes a few thousand delivery points, so this is normal rather than an error in an address.
Can I download a free HA postcode map?
Yes. This page offers the HA districts as GeoJSON, CSV and SVG, free and with no signup or email address required. The GeoJSON carries each district's position, its water company and its current restriction status, so it can be dropped straight into a mapping tool.
Why is the HA area called Bushey when it covers Borehamwood?
HA takes its letters from Bushey, where the sorting office that served the area was based when the code was allocated. Borehamwood is the largest settlement in the area today, in HA8, but the area code follows the historic sorting geography rather than current population.
How many postcode sectors are in HA?
HA contains 57 postcode sectors across its 10 districts. A sector is the district plus the first digit of the second half of the postcode, and it is the level a delivery round is actually planned around.