Water Hardness and Quality in Preston
Supplied by United Utilities · City Centre
Preston has slightly hard water with quality that meets all UK drinking water standards.
Check a specific postcode in Preston
Water Quality Scorecard
Total Hardness
Guideline: 150+ mg/l is considered hard
140.8mg/l CaCO₃
UK Average: 197.72 mg/l CaCO₃Below Average
LowAverageHigh
pH Level
UK Standard: 6.5 – 9.5
7.27pH units
UK Average: 7.43 pH unitsBelow Average
LowAverageHigh
Free Chlorine
Guideline: below 1 mg/l
0.58mg/l
UK Average: 0.45 mg/lAbove Average
LowAverageHigh
Water Hardness in Preston
Hardness is the most searched water quality metric. It affects limescale buildup in kettles, boilers, and pipes.
140.8mg/l CaCO₃Slightly Hard
Soft
Mod. Soft
Slightly Hard
Mod. Hard
Hard
Very Hard
Preston has moderately hard water. You may notice some limescale buildup in your kettle and on taps over time. A regular descaling routine should be sufficient for most households.
Water Source Information
- Water Company
- United Utilities
- Supply Zone
- City Centre
- Source Type
- Mixed
- Treatment Works
- Preston Treatment Works
- Last Tested
- 2024-12-31
- Data Source
- United Utilities
Frequently Asked Questions
Is the water hard in Preston?▾
Preston has moderately hard water at 140.8 mg/l CaCO₃. Some limescale may occur but it is manageable with regular descaling.
Is Preston tap water safe to drink?▾
Yes, tap water in Preston is safe to drink. It is treated and tested by United Utilities and meets all UK Drinking Water Inspectorate standards. All tested parameters are within regulatory limits.
What is the water hardness in Preston?▾
The water hardness in Preston is 140.8 mg/l CaCO₃, which is classified as "Slightly Hard". This is below the UK national average of 170 mg/l.
Who supplies water to Preston?▾
Water in Preston is supplied by United Utilities, which serves the North West England region. The water comes from mixed sources and is treated at Preston Treatment Works.