Water Hardness and Quality in Gerrards Cross
Supplied by Affinity Water · Beaconsfield/Chalfont St Giles (AF044)
Gerrards Cross has hard water with quality that meets all UK drinking water standards.
Check a specific postcode in Gerrards Cross
Water Quality Scorecard
Total Hardness
Guideline: 150+ mg/l is considered hard
288mg/l CaCO₃
UK Average: 197.72 mg/l CaCO₃Well Above Average
LowAverageHigh
pH Level
UK Standard: 6.5 – 9.5
7.1pH units
UK Average: 7.43 pH unitsWell Below Average
LowAverageHigh
Free Chlorine
Guideline: below 1 mg/l
0.22mg/l
UK Average: 0.45 mg/lWell Below Average
LowAverageHigh
Nitrate
UK Standard: max 50 mg/l
22.7mg/l
UK Average: 16.9 mg/lAbove Average
LowAverageHigh
Lead
UK Standard: max 10 µg/l
0.67µg/l
UK Average: 1.08 µg/lAverage
LowAverageHigh
Fluoride
UK Standard: max 1.5 mg/l
0.094mg/l
UK Average: 0.19 mg/lBelow Average
LowAverageHigh
Water Hardness in Gerrards Cross
Hardness is the most searched water quality metric. It affects limescale buildup in kettles, boilers, and pipes.
288mg/l CaCO₃Hard
Soft
Mod. Soft
Slightly Hard
Mod. Hard
Hard
Very Hard
Gerrards Cross has hard water at 288 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
- Affinity Water
- Supply Zone
- Beaconsfield/Chalfont St Giles (AF044)
- Source Type
- Groundwater
- Treatment Works
- Beaconsfield/Chalfont St Giles Treatment Works
- Last Tested
- 2025-12-31
- Data Source
- Affinity Water
Frequently Asked Questions
Is the water hard in Gerrards Cross?▾
Yes, Gerrards Cross has hard water at 288 mg/l CaCO₃. This is classified as "Hard" on the standard scale. You may notice limescale buildup in kettles and on taps.
Is Gerrards Cross tap water safe to drink?▾
Yes, tap water in Gerrards Cross is safe to drink. It is treated and tested by Affinity Water and meets all UK Drinking Water Inspectorate standards. All tested parameters are within regulatory limits.
What is the water hardness in Gerrards Cross?▾
The water hardness in Gerrards Cross is 288 mg/l CaCO₃, which is classified as "Hard". This is above the UK national average of 170 mg/l.
Who supplies water to Gerrards Cross?▾
Water in Gerrards Cross is supplied by Affinity Water, which serves the South East England region. The water comes from underground aquifers and is treated at Beaconsfield/Chalfont St Giles Treatment Works.