Parts of London, South East and eastern England

Affinity Water: water quality and hardness

Affinity is a water-only supplier: it delivers drinking water, while a different company handles wastewater. Its supply areas include parts of the Home Counties and London, plus the Tendring peninsula and Folkestone/Dover areas.

An independent WaterGrade guide. Local readings vary by source area and date.

Restrictions: Check the current hosepipe ban status for Affinity Water

Find the water serving your home

This checks the supplying area; it does not assume this company serves every postcode you enter.

How Affinity Water reports on your water

Affinity’s quality page includes a postcode-based hardness and fluoride search. The company states that it does not add fluoride; that does not mean naturally occurring fluoride is absent.

Look up your postcode and open the linked report. A live hardness summary and an annual PDF can describe different reporting periods, so check the dates before treating a difference as a trend.

Company information and source context ↗

What WaterGrade currently holds

Named areas with records: 92
Areas with measured hardness: 92
Areas with other quality data: 92
Areas with annual hardness history: 0

These count our verified records, including historical areas. They are not the company’s current total zones, population coverage or a quality score.

Is the water hard or soft?

Check the figure for your supply zone. A company can deliver water from different sources, so a single average can give the wrong appliance setting for your home. Hardness describes dissolved minerals; it is not a safety rating.

Our local cards use mg/l as calcium carbonate (CaCO₃). Keep the original unit and reporting period when comparing results. Supplier labels can use different hardness bands.

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What do the quality results tell you?

Read each parameter with its units, sample count, range and reporting period. A mean below a reference limit does not establish that every sample complied. A “less than” result is not an exact concentration.

Company-wide performance, local zone results and water at an individual tap are different levels of information. Historical exceedances need the supplier’s investigation context; they are not automatically a current incident.

Understand the measurements in a water report

One named-area example · not a company average

Inside the Amersham/Prestwood report

325 mg/l as CaCO₃ · hardness period: 2025

Quality reporting period: 2025. 45 parameters in this publication. Hardness may come from a separate source and period.

Selected source measurements for Amersham/Prestwood
Parameter	Published mean	Samples
Chlorine (Residual)	0.21 mgCl2/l	143
Fluoride	0.105 mgF/l	8
Hydrogen Ion (pH)	7.1 pH value	52
Iron	<9.0 μgFe/l	8
Lead	1.28 μgPb/l	8
Nitrate	21.7 mgNO3/l	8

This selected example may not serve your postcode. Open the full report for ranges, source notes, any reported contraventions and the original document.

Read the full Amersham/Prestwood report →

Find your local source-area report

Use the exact area name from the supplier’s checker. Older areas can have been renamed or replaced. Each card keeps the hardness period separate from other quality data.

Search by the exact source-area nameWith annual hardness history

92 areas match · showing 24.