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East Hertfordshire, England
Your water in SG11
East Hertfordshire
Your water is safe
We checked 24 things and found nothing to worry about
ExcellentYour water is safe
We checked 24 things and found nothing to worry about
ExcellentTap water in SG11 (East Hertfordshire, East Hertfordshire) is supplied by Affinity Water and scored 9.1 out of 10 for safety based on 24 tested parameters. No contaminants exceeded recommended safe levels. Data is from 2,656 samples collected up to 2025-12-15, sourced from Affinity Water via the Stream Water Data Portal.
Drinking water testsHow we score
Last sampled 2025-12-15 · 2,656 samples
What’s in your tap water
Results from drinking water tests in East Hertfordshire.
| Substance | Found | Safe Level | WHO Safe Level | Status |
|---|---|---|---|---|
| E. coli | 0 count/100ml | 0 count/100ml | 0 count/100ml | Safe |
| Coliform Bacteria | 0 count/100ml | 0 count/100ml | 0 count/100ml | Safe |
| Boron | 0.046 mg/L | 1 mg/L | 2.4 mg/L | Safe |
| Cadmium | 0.000054 mg/L | 0.005 mg/L | 0.003 mg/L | Safe |
| Trihalomethanes | 0.00359 mg/L | 0.1 mg/L | — | Safe |
| Lead | 0.000673 mg/L | 0.01 mg/L | 0.01 mg/L | Safe |
Source: Stream Water Data Portal
Filters for SG11
General-purpose filters for common UK tap water concerns.
Our pick for SG11
BRITA Marella XL + MAXTRA PRO
Jug Filter · TUV SUD
A solid all-round filter for SG11. 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
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 SG11. This is environmental monitoring — not your tap water.
| Substance | Found | Safe Level | WHO Safe Level | Status |
|---|---|---|---|---|
| Iron | 0.16 mg/L | 0.2 mg/L | 0.3 mg/L | Watch |
Source: Environment Agency
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