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Hertsmere, England
Hertsmere
Your water is safe
We checked 14 things and found 2 worth knowing about
GoodYour water is safe
We checked 14 things and found 2 worth knowing about
GoodTap water in WD23 (Hertsmere, Hertsmere) is supplied by Thames Water and scored 8 out of 10 for safety based on 14 tested parameters. 2 contaminants exceeded recommended safe levels: Lead, Iron. Data is from samples last taken 2022-02-04, sourced from the Environment Agency Water Quality Archive.
Last sampled 2022-02-04 · Tap water tests not yet available for Thames Water
This data is over 4 years old. The Environment Agency hasn't sampled near WD23 recently. Scores reflect the most recent available data.
Here’s what government tests found in water near you.
| Substance | Found | Safe Level | WHO Safe Level | Status |
|---|---|---|---|---|
| Lead | 0.0172 mg/L | 0.01 mg/L | 0.01 mg/L | Over limit |
| Iron | 0.69 mg/L | 0.2 mg/L | 0.3 mg/L | Over limit |
Source: Environment Agency
2 contaminants flagged in WD23. These filters are matched to what was found in your water.

Our pick for WD23
Doulton HIP Ultracarb
Under-Sink Filter · NSF/ANSI 42, NSF/ANSI 53
The Doulton HIP Ultracarb is certified to remove Lead, which was flagged in WD23. Fits under your kitchen sink for filtered water on tap.
Removes from your water
£120
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
Learn more about the water quality issues relevant to this area.
Rivers, groundwater and reservoirs near WD23. This is environmental monitoring — not your tap water.
| Substance | Found | Safe Level | WHO Safe Level | Status |
|---|---|---|---|---|
| Lead | 0.0172 mg/L | 0.01 mg/L | 0.01 mg/L | Over limit |
| Iron | 0.69 mg/L | 0.2 mg/L | 0.3 mg/L | Over limit |
Source: Environment Agency
We'll email you when water quality data changes for WD23.