Water Hardness and Quality in Lewisham North
Supplied by Thames Water · Lewisham North (SLE44)
Lewisham North has hard water with quality that meets all UK drinking water standards.
Check a specific postcode in Lewisham North
Water Quality Scorecard
Total Hardness
Guideline: 150+ mg/l is considered hard
286mg/l CaCO₃
UK Average: 197.72 mg/l CaCO₃Well Above Average
LowAverageHigh
pH Level
UK Standard: 6.5 – 9.5
7.5pH units
UK Average: 7.43 pH unitsAbove Average
LowAverageHigh
Free Chlorine
Guideline: below 1 mg/l
0.54mg/l
UK Average: 0.45 mg/lAbove Average
LowAverageHigh
Nitrate
UK Standard: max 50 mg/l
22mg/l
UK Average: 16.9 mg/lAbove Average
LowAverageHigh
Lead
UK Standard: max 10 µg/l
1µg/l
UK Average: 1.08 µg/lAbove Average
LowAverageHigh
Fluoride
UK Standard: max 1.5 mg/l
0.16mg/l
UK Average: 0.19 mg/lWell Above Average
LowAverageHigh
Water Hardness in Lewisham North
Hardness is the most searched water quality metric. It affects limescale buildup in kettles, boilers, and pipes.
286mg/l CaCO₃Hard
Soft
Mod. Soft
Slightly Hard
Mod. Hard
Hard
Very Hard
Lewisham North has hard water at 286 mg/l. You will likely experience significant limescale buildup in kettles, boilers, and on bathroom surfaces. Many residents in your area use water softeners or anti-limescale products.
Water Source Information
- Water Company
- Thames Water
- Supply Zone
- Lewisham North (SLE44)
- Source Type
- River
- Treatment Works
- Lewisham North Treatment Works
- Last Tested
- 2025-12-31
- Data Source
- Thames Water
Frequently Asked Questions
Is the water hard in Lewisham North?▾
Yes, Lewisham North has hard water at 286 mg/l CaCO₃. This is classified as "Hard" on the standard scale. You may notice limescale buildup in kettles and on taps.
Is Lewisham North tap water safe to drink?▾
Yes, tap water in Lewisham North is safe to drink. It is treated and tested by Thames Water and meets all UK Drinking Water Inspectorate standards. All tested parameters are within regulatory limits.
What is the water hardness in Lewisham North?▾
The water hardness in Lewisham North is 286 mg/l CaCO₃, which is classified as "Hard". This is above the UK national average of 170 mg/l.
Who supplies water to Lewisham North?▾
Water in Lewisham North is supplied by Thames Water, which serves the London and Thames Valley region. The water comes from river sources and is treated at Lewisham North Treatment Works.