Water quality, hardness and compliance in South East England
According to TapWater.uk's analysis, Affinity Water scores 8.4/10 for drinking water quality across 3 monitored postcode districts in 2026. The company reports 99.92% compliance with UK drinking water standards, and the average hardness across its monitored districts is 266 mg/L CaCO₃.
Scores sorted by lowest first — worst quality at the top.
Measured per district; 100% of monitored districts read hard or very hard, averaging 266 mg/L CaCO₃.
Hard water is safe to drink but drives limescale in kettles, boilers, and appliances. Check your exact postcode or read our water softener guide if scale is a daily battle in your home.
At 266 mg/L a softener protects the boiler, kettle and taps. Tell us your postcode and we will pass your request to installers who cover it. Free, no obligation.
Request a free assessment and we'll come back to you with local installer options for your area.
100%
free, no obligation
shared only with your consent
Reported compliance with UK drinking water standards.
99.92%
Compliance above 99.9% is the norm across the UK industry, which is why a compliance figure alone says little about how your water actually tastes, scales, or reads locally. The per-district scores and flagged contaminants above are where Affinity Water's supply differs from the national picture.
All postcode districts within Affinity Water's supply network.
Yes. Across 3 monitored postcode districts, Affinity Water's average water quality score is 8.4/10. The lowest-scoring district we monitor is NW9 (7.9/10) and the highest is N12 (8.6/10).
Across 3 monitored districts in Affinity Water's area, the average hardness is 266 mg/L CaCO₃ and 100% of districts read hard or very hard. Expect limescale: descaling, and in many homes a water softener, are worth considering.
Affinity Water reported a 99.92% compliance rate against UK drinking water standards. Compliance above 99.9% is the industry norm, which is exactly why we also publish per-district environmental scores and flagged contaminant counts: legal compliance and local water character are different questions.
Affinity Water supplies 3.6 million customers across South East England. The postcode districts we monitor in its area: N11, N12, NW9.
Active incidents affecting Affinity Water appear at the top of this page as soon as our monitoring picks them up, alongside the affected postcodes. For supply emergencies always check Affinity Water's own website, which carries the operational updates.