Thames Water Water Quality

Serving 15 million people across London and the Thames Valley

A
Overall Water Quality Grade

Key Measurements

Readings for the PARLIAMENT supply zone

Hardness 260 ppm
Lead 1.2 ppb
Chlorine 0.6 ppm
Nitrate 24 ppm
Iron 8 ppb
Fluoride 0.1 ppm
Copper 23 ppb
pH Level 7.8 (ideal: 6.5 - 9.5)
Good news:
  • low lead levels

Recommendations

Very hard water areaImportant

Hardness at 260 mg/l. Water above 200 mg/l is classified as very hard. Hard water causes limescale buildup in kettles and appliances, reduces soap lathering, and can leave hair feeling dry or stiff.

Note: These readings are from a representative zone in the Thames Water supply area. Water quality varies between neighbourhoods and supply zones. Enter your postcode below for exact readings at your address.

Check Your Exact Postcode

Water quality varies by area. Get precise readings for your address in the Thames Water region.

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