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South Oxfordshire, England
Your water in OX4
South Oxfordshire
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: 241 mg/L (hard)
Hard water — may cause limescale buildup in kettles and pipes
Hard water is costing your home money
Your water is hard (241 mg/L) — find out if a softener is worth it
Tap water in OX4 (South Oxfordshire, South Oxfordshire) is supplied by Thames Water and scored 9 out of 10 for safety based on 22 tested parameters. No contaminants exceeded recommended safe levels. Data is from 74 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 · 74 samples
What’s in your tap water
Results from drinking water tests in South Oxfordshire.
| 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 | 510 µS/cm | — | — | Safe |
| Fluoride | 0.12 mg/L | 1.5 mg/L | 1.5 mg/L | Safe |
| Nitrate | 18 mg/L | 50 mg/L | 50 mg/L | Safe |
Source: Stream Water Data Portal
Filters for OX4
General-purpose filters for common UK tap water concerns.
Our pick for OX4
BRITA Marella XL + MAXTRA PRO
Jug Filter · TUV SUD
A solid all-round filter for OX4. 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
Hard water is costing your home money
Limescale reduces boiler efficiency and shortens appliance life. Based on your water hardness (241 mg/L — hard), a softener could save you £200+/year.
Get a free assessment — we'll tell you if it's worth it and connect you with trusted local installers.
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Shower filters
Remove chlorine for better skin and hair
Test your water
Confirm exactly what's in your pipes
Related guides
Learn more about the water quality issues relevant to this area.
Environmental water nearby
Rivers, groundwater and reservoirs near OX4. This is environmental monitoring — not your tap water.
| Substance | Found | Safe Level | WHO Safe Level | Status |
|---|---|---|---|---|
| Lead | 0.014 mg/L | 0.01 mg/L | 0.01 mg/L | Over limit |
Source: Environment Agency
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