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Guildford, England
Your water in GU23
Guildford
Your water is safe
We checked 22 things and found nothing to worry about
ExcellentYour water is safe
We checked 22 things and found nothing to worry about
ExcellentH
Water hardness: 154 mg/L (moderately hard)
Moderate hardness — unlikely to cause issues
Tap water in GU23 (Guildford, Guildford) is supplied by Thames Water and scored 9.4 out of 10 for safety based on 22 tested parameters. No contaminants exceeded recommended safe levels. Data is from 71 samples collected up to 2025-12-31, sourced from Thames Water via the Stream Water Data Portal.
Drinking water testsHow we score
Last sampled 2025-12-31 · 71 samples
What’s in your tap water
Results from drinking water tests in Guildford.
| Substance | Found | Safe Level | WHO Safe Level | Status |
|---|---|---|---|---|
| Coliform Bacteria | 0 count/100ml | 0 count/100ml | 0 count/100ml | Safe |
| E. coli | 0 count/100ml | 0 count/100ml | 0 count/100ml | Safe |
| Colour | 1.8 mg/L Pt/Co | 20 mg/L Pt/Co | — | Safe |
| Conductivity | 290 µS/cm | — | — | Safe |
| Fluoride | 0.12 mg/L | 1.5 mg/L | 1.5 mg/L | Safe |
| Nitrate | 3.1 mg/L | 50 mg/L | 50 mg/L | Safe |
Source: Stream Water Data Portal
Filters for GU23
General-purpose filters for common UK tap water concerns.
Our pick for GU23
BRITA Marella XL + MAXTRA PRO
Jug Filter · TUV SUD
A solid all-round filter for GU23. Removes Chlorine, Lead, Copper and more. No installation needed.
Check price & reviews
£25
4.5/5
2 more options
Recommendations matched to your area's water data, not sponsorship. We may earn a commission at no extra cost to you. Affiliate disclosure · Full filter guide
Shower filters
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Related guides
Learn more about the water quality issues relevant to this area.
Environmental water nearby
Rivers, groundwater and reservoirs near GU23. This is environmental monitoring — not your tap water.
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