England

PFAS in London Water

Based on Environment Agency monitoring data. Last updated 6 August 2026.

According to TapWater.uk's analysis, 26 PFAS compounds have been detected across 23 sampling points in London. The highest recorded level is 0.099 µg/L (6:2 FtSAB).

Compounds detected

Sampling points

Highest level

0.099 µg/L

Latest date

6 August 2026

<0.01 µg/L

0.01–0.075 µg/L

>0.075 µg/L

PFAS levels over time

Monthly aggregate PFAS levels. Dashed line shows WHO guideline (0.1 µg/L).

Compounds detected

6:2 FtSAB

0.0990 µg/L

PFPeA

0.0410 µg/L

6:2 FTSA

0.0370 µg/L

PFHxA

0.0320 µg/L

PFOS (total)

0.0280 µg/L

PFBA

0.0220 µg/L

PFOS (linear)

0.0190 µg/L

PFHpA

0.0180 µg/L

PFBS

0.0160 µg/L

PFOA

0.0150 µg/L

PFOS

0.0140 µg/L

PFecHS

0.0120 µg/L

5:3 FTCA

0.0120 µg/L

PFOS (branched)

0.0100 µg/L

PFHxS (linear)

0.0087 µg/L

7:3 FTCA

0.0057 µg/L

8:2 FTSA

0.0034 µg/L

PFNA

0.0032 µg/L

PFDA

0.0026 µg/L

FBSA

0.0025 µg/L

PFDoDA

0.0021 µg/L

PFHxS (branched)

0.0018 µg/L

PFHxSA

0.0016 µg/L

PFPeS

0.0010 µg/L

PFHpS

0.0006 µg/L

PFNS

0.0005 µg/L

Dashed line = WHO guideline (0.1 µg/L). Bar shows maximum detected level.

Sampling points

Environment Agency monitoring locations near London.

LocationMax levelCompoundCoordinates

RSN1521 LEE AT THREE MILLS YARD- LEE (TOTTENHAM-BOW LOCK)

0.014 µg/L6:2 FtSAB51.5281, -0.0099

BRENT / G.U.C. AT LOCK 100, BRENTFORD

0.019 µg/LPFHxA51.4827, -0.3122

CRANE AT NORTHCOTE ROAD, ISLEWORTH

0.099 µg/L6:2 FtSAB51.4602, -0.3267

LEE NAVIGATION SUBSIDIARY B ABOVE PICKETTS LOCK

0.014 µg/LPFOS51.6263, -0.0322

BEVERLEY BROOK AT PRIESTS BRIDGE

0.013 µg/LPFPeA51.4658, -0.2521

WANDLE AT THE CAUSEWAY, WANDSWORTH

0.018 µg/LPFPeA51.4590, -0.1938

LEE AT CARPENTERS RD

0.016 µg/L6:2 FtSAB51.5426, -0.0157

TWICKENHAM, MEADOWBANK HOUSE BH, 10M :TQ17/126

0.038 µg/LPFPeA51.4517, -0.3057

RAVENSBOURNE AT DEPTFORD BRIDGE, DEPTFORD

0.012 µg/LPFPeA51.4691, -0.0170

EDMONTON, OAKTHORPE DAIRY BH1 & BH2 :TQ39/21A

0.004 µg/LPFHxS (linear)51.6145, -0.0937

SALMON BROOK ABOVE DEEPHAMS STW

0.012 µg/LPFBA51.6213, -0.0445

BATHING WATER - HAMPSTEAD HEATH MIXED POND (11930)

0.006 µg/LPFBA51.5607, -0.1663

BATHING WATER - HAMPSTEAD HEATH LADIES POND (11910)

0.019 µg/LPFPeA51.5667, -0.1601

BATHING WATER - HAMPSTEAD HEATH MENS POND (11920)

0.014 µg/LPFPeA51.5633, -0.1566

BATHING WATER - THE SERPENTINE (11940)

0.004 µg/LPFBS51.5049, -0.1691

POOL AT WINSFORD ROAD :BELL GREEN

0.018 µg/LPFBA51.4338, -0.0290

PYMMES BROOK R.H. CHANNEL AT FERRY LANE

0.010 µg/LPFPeA51.5879, -0.0569

LEE ABOVE LEA BRIDGE WEIR

0.010 µg/LPFPeA51.5620, -0.0437

SALMON BROOK BELOW ENFIELD DITCH

0.012 µg/LPFPeA51.6118, -0.0423

PYMMES BROOK ABOVE SALMON BROOK

0.007 µg/LPFPeA51.6110, -0.0454

DUKE OF NORTHUMBERLANDS BELOW TRUMANS BREWERY, ISLEWORTH

0.016 µg/LPFPeA51.4709, -0.3313

HAMMERSMITH, HAMMERSMITH HOSPITAL B/H

0.004 µg/LPFPeA51.5181, -0.2381

SILK STREAM AT SILK BRIDGE, A5, HENDON

0.009 µg/LPFOS (total)51.5808, -0.2438

What this means for your tap water

Important context: the Environment Agency data shown here is from environmental monitoring of rivers and groundwater — not treated tap water. PFAS detected in source water does not necessarily mean the same levels are present in the water that comes out of your tap.

Water treatment processes can reduce PFAS concentrations, though the effectiveness varies by treatment method and PFAS compound. UK water companies are not required to publish PFAS removal rates. If you are concerned, a reverse osmosis filter offers the most reliable protection at home.

How to reduce PFAS exposure

A reverse osmosis system is the most effective way to remove PFAS from your drinking water at home, eliminating over 95% of forever chemicals.

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PFAS data for nearby cities

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Frequently asked questions

Has PFAS been found in London water?

Yes. Environment Agency monitoring has detected 26 PFAS compounds across 23 sampling points in water sources near London. The highest recorded level is 0.099 µg/L (6:2 FtSAB). Note that this is environmental monitoring of rivers and groundwater, not treated tap water.

What PFAS compounds were found in London?

The following PFAS compounds have been detected near London: PFOA, PFOS, PFPeA, PFHxS (branched), PFBA, PFBS, PFHxS (linear), PFHpA, PFOS (linear), PFPeS, PFHxA, 6:2 FTSA, PFNA, PFHxSA, FBSA, PFOS (branched), PFecHS, 5:3 FTCA, 8:2 FTSA, PFHpS, PFDA, 7:3 FTCA, PFDoDA, 6:2 FtSAB, PFOS (total), PFNS. 6:2 FtSAB was recorded at the highest level of 0.099 µg/L.

Is London tap water safe to drink despite PFAS?

London tap water meets all current UK legal standards. However, the UK has no legal limit for PFAS in drinking water. The Environment Agency data shows PFAS in source water (rivers and groundwater), not in treated tap water. Water treatment may reduce PFAS levels, but the extent of removal is not publicly reported.

How can I remove PFAS from my water in London?

The most effective method is a reverse osmosis (RO) filtration system, which removes over 95% of PFAS compounds. Standard carbon filters and jug filters like BRITA do not effectively remove PFAS. An under-sink RO system is recommended for London households concerned about PFAS exposure.