Tap water in ME4, MedwaySafe to drink.
Supplied by Southern Water. 22,206 samples, 22 substances, latest on 30 April 2026. Everything is inside the legal limit, and nothing comes close to it.
9.3 / 10
The tank is as full as the score.
What to do about it
ZeroWater 12-Cup Ready-Pour
£40typical price
Households concerned about PFAS and heavy metals
Waterdrop 10UA Under Sink
£70typical price
High-volume under-sink filtration without RO complexity
BRITA Marella XL + MAXTRA PRO
£25typical price
Basic chlorine and taste improvement on a budget
We earn a commission if you buy through these links, at no extra cost to you. It never changes which product we put first. How we make money
What's in a glass of ME4 water
Every bubble is a substance the lab measured. The higher it floats, the closer it came to its legal limit, the dashed line at the top.
Nitrate came closest to a limit, at 53% of it. 16 of 18 substances used under a quarter of theirs.
- Nitrate53%
- Trihalomethanes33%
- Colour15%
- Nickel10%
- Aluminium9%
- Ammonia8%
- Iron8%
- Chromium4%
- Manganese4%
- Turbidity3%
- Arsenic2%
- Bromate2%
- Nitrite2%
- Selenium2%
- Antimony1%
- Cadmium1%
- Lead<1%
- Copper<1%
- Coliform Bacteria none found
- E. coli none found
- Conductivity 505 µS/cm
- pH 7.2 pH
All 22 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| Nitrate | 26.4 mg/L | 50 mg/L | 53% |
| Lead | 0.00009 mg/L | 0.01 mg/L | <1% |
| Coliform Bacteria | 0 count/100ml | Must be zero | None found |
| E. coli | 0 count/100ml | Must be zero | None found |
| Conductivity | 505 µS/cm | No legal limit | – |
| Trihalomethanes | 0.0328 mg/L | 0.1 mg/L | 33% |
| Colour | 3 mg/L Pt/Co | 20 mg/L Pt/Co | 15% |
| Turbidity | 0.13 NTU | 4 NTU | 3% |
| pH | 7.2 pH | No legal limit | – |
| Iron | 0.0153 mg/L | 0.2 mg/L | 8% |
| Manganese | 0.00178 mg/L | 0.05 mg/L | 4% |
| Aluminium | 0.0174 mg/L | 0.2 mg/L | 9% |
| Nitrite | 0.009 mg/L | 0.5 mg/L | 2% |
| Ammonia | 0.039 mg/L | 0.5 mg/L | 8% |
| Copper | 0.003 mg/L | 2 mg/L | <1% |
| Arsenic | 0.00021 mg/L | 0.01 mg/L | 2% |
| Cadmium | 0.000052 mg/L | 0.005 mg/L | 1% |
| Chromium | 0.00197 mg/L | 0.05 mg/L | 4% |
| Nickel | 0.00202 mg/L | 0.02 mg/L | 10% |
| Antimony | 0.000057 mg/L | 0.005 mg/L | 1% |
| Selenium | 0.00068 mg/L | 0.04 mg/L | 2% |
| Bromate | 0.0002 mg/L | 0.01 mg/L | 2% |
Your estuary is the Medway, rated moderate
The Environment Agency rated the Medway as moderate for ecological health in its 2025 assessment, meaning the estuary is noticeably changed by pollution or engineering. It is held back by nitrogen and seagrass and saltmarsh. It fails the chemical test, as every river, estuary and stretch of coast in England does, because of long-lasting pollutants such as mercury, PFOS (a forever chemical) and old flame retardants.
None of this is a test of your tap water. Environment Agency record · River health across England
ME4 in short
Tap water in ME4 (Medway) is supplied by Southern Water in the Medway Central zone and scores 9.3 out of 10, against an England and Wales average of 9.0. None of the 22 tested substances came close to a limit. The latest sample is from 30 April 2026.
- Nitrate is the reading closest to its limit, at 53% of the 50 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
- 5th cleanest of 7 areas tested in Medway2 areas in Medway scored lower. The best is ME8 on 9.5.
- Scores higher than 1 of 6 neighbouring districtsWater here is typical for the immediate area, which usually means the same treatment works and the same supply zone.
Questions about ME4 water
Is ME4 tap water safe to drink?
Based on the latest tests, ME4 (Medway) water scores 9.3/10, which is safe. 0 of 22 tested contaminants exceeded recommended levels. Water is supplied by Southern Water.
What contaminants are in ME4 water?
We tested 22 contaminants in ME4 water. None exceeded recommended safe levels.
Who supplies water in ME4?
ME4 (Medway) is supplied by Southern Water. You can view their full profile and compliance data on our supplier page.
Should I use a water filter in ME4?
ME4 water scored 9.3/10 with no contaminants above recommended levels. A filter is optional but can improve taste, especially if you notice a chlorine flavour. See our filter recommendations for your area.
Are there PFAS forever chemicals in ME4 water?
No PFAS (forever chemicals) result is attached to the tap-water tests for ME4, and the Environment Agency has no PFAS detections in rivers or groundwater within 10 km of it. That reflects where sampling has happened as much as the water itself.
How clean is the estuary near ME4?
The Environment Agency rated the Medway as moderate for ecological health in its 2025 assessment, meaning the estuary is noticeably changed by pollution or engineering. It is held back by nitrogen and seagrass and saltmarsh. It fails the chemical test, as every river, estuary and stretch of coast in England does, because of long-lasting pollutants such as mercury, PFOS (a forever chemical) and old flame retardants. This is a rating of the estuary, not of tap water in ME4, which is treated before it reaches homes.
Keep reading
- Is UK Tap Water Safe?Everything you need to know about tap water safety in the UK
- Best Water Filters UKEvery filter type compared on what it actually removes
- How to Test Your Tap WaterFrom DIY strips to professional lab analysis
- Best Water Filter Jug UKBRITA vs ZeroWater vs the rest, tested against real data
How to test your waterBest water filtersFilter shower headsWater testing kitsUK water rankingsWater hardness checkerWater hardness map
River and groundwater readings near ME4
Environment Agency samples from rivers, groundwater and reservoirs nearby. Not your tap water. For scale they are shown against drinking water limits; rivers are judged against much stricter environmental standards, and on those every river in England fails for chemicals.
Get alerts for your area
We'll email you when water quality data changes for ME4.