Who supplies water in Maidenhead?

Maidenhead is one of the relatively few towns in England where fresh water is supplied by two different companies depending on your postcode. The bulk of SL6 — including the town centre, Cox Green, Furze Platt and most of Pinkneys Green — sits inside the Thames Water supply area. The eastern and southern fringes of SL6 closest to Slough and Burnham fall inside the Affinity Water Central region. Sewerage and wastewater for the entire Maidenhead area are handled by Thames Water, with no involvement from Southern Water.

If you have just moved into Maidenhead, your first step is to confirm which fresh-water company runs your street. The simplest route is the official Water UK postcode checker, which returns both the supply and sewerage company for any UK postcode. Water in the UK is a regional monopoly, so you cannot switch — but you must register so the bill is issued in your name from the day you move in.

fresh-water companies serve Maidenhead: Thames Water (most of SL6) and Affinity Water (eastern fringe near Slough)

Thames Water and Affinity Water contact details for Maidenhead
Service Company Phone Hours
Fresh water (most of SL6)Thames Water0800 980 8800Mon–Fri 8am–8pm, Sat 8am–6pm
Fresh water (Slough-side fringe)Affinity Water0345 357 2401Mon–Fri 8am–5pm
Water supply emergencies (Thames Water area)Thames Water0800 316 980024 hours, 7 days
Water supply emergencies (Affinity area)Affinity Water0345 357 240724 hours, 7 days
Sewerage & wastewater (whole town)Thames Water0800 316 980024 hours, 7 days

Source: Thames Water and Affinity Water published customer contact numbers. 0800 numbers are free from UK landlines and mobiles; 0345 numbers are charged at a standard landline rate and are normally included in inclusive minute bundles.

Where does Maidenhead's water come from? Both Thames Water and Affinity Water draw the local Maidenhead supply largely from chalk aquifers in the Chilterns, topped up by abstraction from the River Thames upstream of the town. This chalk geology is the reason Maidenhead sits firmly in a hard water zone.

For the full set of contact channels, complaints procedures and account services, see our dedicated Thames Water supplier guide and Affinity Water supplier guide.

Moving home in Maidenhead

When you move into a property in Maidenhead, you need to open an account with the fresh-water company that serves your address — Thames Water for the bulk of the town, or Affinity Water for the Slough-side fringe — and a separate sewerage account with Thames Water. In practice, Thames Water bills supply and sewerage together on a single statement, while Affinity Water customers receive two bills.

Both companies accept up to 28 to 30 days' notice of a move, either online or by phone. Submit a closing meter reading on the day you leave your old address and an opening reading the day you arrive — without those, the final bill will be estimated and you may end up paying for the next occupier's first weeks of usage.

For step-by-step move-in instructions, see our Thames Water moving home guide or the equivalent Affinity Water moving home guide depending on your supplier.

Water rates in Maidenhead

Water rates in Maidenhead depend on whether your property is metered or non-metered, and on which supplier serves your address. The combined supply and sewerage bill sits at roughly £480 a year for an average Maidenhead household in 2026, slightly above the England and Wales average of around £473 published by Water UK.

Thames Water customers receive a single bill covering both supply and sewerage. Affinity Water customers receive two: one from Affinity Water for the supply portion (typically £190–£220 a year for a metered household of two) and one from Thames Water for sewerage (typically £260–£300 a year). The split looks more complicated on paper but the total is broadly similar.

Non-metered properties are billed on rateable values set by councils back in the 1990s. These do not reflect modern property values and feed directly into the annual charge. Homes built after 1990 will almost certainly have a meter from the start. Metered households are charged by the cubic metre — typically cheaper for couples and single occupants, more expensive for large families.

To check whether your property is metered, look at your most recent water bill for a meter serial number, or locate the meter itself — usually housed outside in a small plastic chamber or inside near the internal stop tap under the kitchen sink. Both Thames Water and Affinity Water install meters free of charge on request, with a 24-month trial period during which you can revert to rateable-value billing if a meter turns out to be more expensive.

Struggling to pay? Thames Water runs the WaterHelp social tariff for low-income households and WaterSure for large families or those with medical conditions causing high water use. Affinity Water offers a parallel LIFT social tariff and WaterSure scheme. Call Thames Water on 0800 980 8800 or Affinity Water on 0345 357 2401 to check eligibility. For a full breakdown see our WaterSure scheme guide.

For more on how UK water charges are calculated, see our UK water rates guide and the average UK water bill breakdown.

Maidenhead water hardness

Water in Maidenhead is classed as hard water across both the Thames Water and Affinity Water supply zones. This is because the supply is largely drawn from chalk aquifers in the Chilterns, picking up dissolved calcium and magnesium on its way to the tap. Both companies publish hardness levels in the range of 250–300 mg/l as calcium carbonate for the Maidenhead area, well above the 200 mg/l threshold for "hard".

Hard water means Maidenhead residents are likely to see limescale buildup in kettles, pipes, washing machines, dishwashers, showerheads and boilers. Over time, scale can reduce the efficiency of heating elements, shorten appliance lifespan and leave a chalky residue on taps, tiles and shower screens. Hard water is, however, completely safe to drink — calcium and magnesium are essential minerals.

Tips for managing hard water

  • Baths, sinks and toilets — use an acidic descaler (citric acid or a commercial limescale remover) every few weeks to keep deposits in check.
  • Kettles — half-fill with water and add around two tablespoons of white vinegar, leave for up to four hours, then rinse thoroughly before use.
  • Dishwashers — keep the salt reservoir topped up and set the water-hardness dial to the highest setting (your supplier's website will quote the exact mg/l figure for your postcode).
  • Consider fitting a whole-house water softener or a magnetic scale inhibitor on the incoming mains if limescale is a persistent problem; payback typically comes through longer appliance life and lower descaler spend.

For more, see our guide to hard water areas in the UK.

Can you drink Maidenhead water?

Yes — water in Maidenhead is safe to drink straight from the cold kitchen tap. Both Thames Water and Affinity Water publish mean zonal compliance scores above 99.9% against the standards set by the UK Drinking Water Inspectorate (DWI). There is no need to boil or filter mains water in normal circumstances.

If you notice a change in the taste or smell of your water, the most common causes are:

  1. Chlorination — both suppliers add a small amount of chlorine as a hygiene safeguard, which can be more noticeable after maintenance work on the mains.
  2. Seasonal variations — water drawn from different boreholes or surface sources at different times of year can taste slightly different.
  3. Plumbing materials — old copper, lead or rubber components in household plumbing can add metallic, salty or rubbery hints to the taste.

Running the cold tap for a minute before drinking usually clears any short-term issue. If the problem persists, contact whichever company supplies your property so they can investigate.

Reporting water problems in Maidenhead

If you notice a leak, burst pipe, flooding, loss of supply or discoloured water in Maidenhead, your first call depends on which company supplies your fresh water. Sewer and drainage problems always go to Thames Water, regardless of supply company. You do not need to be the account holder to report a problem — anyone can call.

Water leaks and flooding

For a burst main, flooding outside the property or no water across the street, contact the company that supplies your fresh water:

  • Thames Water customers — call 0800 316 9800 (24/7), tweet @thameswater, or use the "Report a Leak" form on thameswater.co.uk.
  • Affinity Water customers — call 0345 357 2407 (24/7), tweet @AffinityWater, or use the "Report a Problem" form on affinitywater.co.uk.
  • Sewer flooding, blocked drains or foul smells — call Thames Water on 0800 316 9800 (24/7), no matter where in Maidenhead you live.

If you are unsure which fresh-water company serves your address, use the Water UK postcode checker before calling.

No water in your home

If you suddenly have no water at your property, work through these steps before calling your supplier:

  1. Check the "In Your Area" section on thameswater.co.uk or affinitywater.co.uk for known outages and incidents in your postcode.
  2. Ask your neighbours whether they also have no water — if they do, the outage is on the network and your supplier will already be aware.
  3. Check that your internal stop tap is fully open (usually under the kitchen sink).
  4. Work out whether you have lost both cold and hot water, or only one. If you have cold water but no hot water, the issue will be with your home plumbing or heating system, not the water company.

For a deeper walkthrough, see our no water in the house guide.

Water discolouration

Discoloured water in Maidenhead is usually the result of recent burst pipe repairs, mains upgrade work or debris loosened during flushing. Water discolouration is not normally harmful and can often be cleared by running the cold water tap for a few minutes until it becomes clear. If discolouration persists, or affects hot water too, call your supplier.

Maidenhead water FAQ

Maidenhead is a split-supply town. Most SL6 addresses receive fresh water from Thames Water, which also handles sewerage for the entire town. The fringes of SL6 closest to Slough are supplied by Affinity Water (Central region), with sewerage still handled by Thames Water. Use the Water UK postcode checker at water.org.uk to confirm which company runs your street.

The average annual water bill in Maidenhead is around £480 in 2026, combining supply and sewerage. Affinity Water customers pay broadly the supply portion to Affinity (around £200) and the sewerage portion to Thames Water (around £280). Thames Water-only households are billed for both on a single account. Metered usage and rateable values can move this up or down by £100 either way.

Maidenhead has hard water across the whole town. Both Thames Water and Affinity Water draw their local supply from chalk aquifers in the Chilterns, which pick up calcium and magnesium on their way to the tap. Expect limescale in kettles, dishwashers, showerheads and boilers.

Yes. Tap water in Maidenhead meets the standards set by the Drinking Water Inspectorate (DWI), with mean zonal compliance scores above 99.9% reported by both Thames Water and Affinity Water. There is no need to boil or filter water from the cold kitchen tap before drinking.

For a burst main, no water or flooding, call Thames Water on 0800 316 9800 (24/7) if you are a Thames Water supply customer, or Affinity Water on 0345 357 2407 (24/7) if you are on the Affinity Water Central network. For blocked drains, sewer flooding or wastewater smells anywhere in Maidenhead, always call Thames Water on 0800 316 9800.

Useful Maidenhead water guides

Our related guides cover Thames Water and Affinity Water in more depth and explain how UK water bills, meters and complaints procedures work.

Disclaimer: The services and products mentioned on this website may only represent a small selection of the options available.