North Hertfordshire, England
Your water in SG3
North 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
ExcellentBased on drinking water tests, your water in SG3 (North Hertfordshire) is supplied by Affinity Water. Based on the latest data (last sampled 2025-04-24), 24 things were tested with 0 exceeding recommended levels. The overall water quality score for SG3 is 9.5/10.
Drinking water testsHow we score
Last sampled 2025-04-24 · 2,279 samples
What’s in your tap water
Results from drinking water tests in North Hertfordshire.
| Substance | Found | Safe Level | WHO Safe Level | Status |
|---|---|---|---|---|
| Colour | 0 mg/L Pt/Co | 20 mg/L Pt/Co | — | Safe |
| Aluminium | 0 mg/L | 0.2 mg/L | — | Safe |
| Iron | 0.00544 mg/L | 0.2 mg/L | 0.3 mg/L | Safe |
| Manganese | 0 mg/L | 0.05 mg/L | 0.08 mg/L | Safe |
| Ammonia | 0.05 mg/L | 0.5 mg/L | — | Safe |
| Nitrate | 25 mg/L | 50 mg/L | 50 mg/L | Safe |
Source: Stream Water Data Portal
Filters for SG3
General-purpose filters for common UK tap water concerns.
Our pick for SG3
BRITA Marella XL + MAXTRA PRO
Jug Filter · TUV SUD
A solid all-round filter for SG3. 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
Environmental water nearby
Rivers, groundwater and reservoirs near SG3. This is environmental monitoring — not your tap water.
| Substance | Found | Safe Level | WHO Safe Level | Status |
|---|---|---|---|---|
| pH | 8.5 pH | — | — | Safe |
| Temperature | 4 °C | — | — | Safe |
| Ammonia | 0.14 mg/L | 0.5 mg/L | — | Safe |
| Nitrate | 4.24 mg/L | 50 mg/L | 50 mg/L | Safe |
| Nitrite | 0.011 mg/L | 0.5 mg/L | 3 mg/L | Safe |
| Phosphate | 0.037 mg/L | — | — | Safe |
Source: Environment Agency
Get alerts for your area
We'll email you when water quality data changes for SG3.