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tapwater
England and Wales average 9.0

Tap water in ST21, StaffordSafe to drink.

Supplied by Severn Trent. 483 samples, 20 substances, latest on 23 December 2025. Everything is inside the legal limit. One result, nitrate, sits close to the line.

See the filter we recommendSee everything that was tested

8.3 / 10

The tank is as full as the score.

What to do about it

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What's in a glass of ST21 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 75% of it. 14 of 17 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitCadmium: 0.00001 mg/L, <1% of the 0.005 mg/L limitCadmium<1%Nitrite: 0.003 mg/L, <1% of the 0.5 mg/L limitNitrite<1%Chromium: 0.00042 mg/L, <1% of the 0.05 mg/L limitChromium<1%Selenium: 0.00035 mg/L, <1% of the 0.04 mg/L limitSelenium<1%Antimony: 0.000059 mg/L, 1% of the 0.005 mg/L limitAntimony1%Manganese: 0.00073 mg/L, 1% of the 0.05 mg/L limitManganese1%Turbidity: 0.12 NTU, 3% of the 4 NTU limitTurbidity3%Iron: 0.007 mg/L, 3% of the 0.2 mg/L limitIron3%Colour: 0.8 mg/L Pt/Co, 4% of the 20 mg/L Pt/Co limitColour4%Fluoride: 0.1 mg/L, 7% of the 1.5 mg/L limitFluoride7%Trihalomethanes: 0.00717 mg/L, 7% of the 0.1 mg/L limitTrihalomethanes7%Copper: 0.147 mg/L, 7% of the 2 mg/L limitCopper7%Aluminium: 0.021 mg/L, 11% of the 0.2 mg/L limitAluminium11%Lead: 0.0013 mg/L, 13% of the 0.01 mg/L limitLead13%Nickel: 0.0063 mg/L, 32% of the 0.02 mg/L limitNickel32%Arsenic: 0.00681 mg/L, 68% of the 0.01 mg/L limitArsenic68%Nitrate: 37.5 mg/L, 75% of the 50 mg/L limitNitrate75%
  1. Nitrate75%
  2. Arsenic68%
  3. Nickel32%
  4. Lead13%
  5. Aluminium11%
  6. Copper7%
  7. Trihalomethanes7%
  8. Fluoride7%
  9. Colour4%
  10. Iron3%
  11. Turbidity3%
  12. Manganese1%
  13. Antimony1%
  14. Selenium<1%
  15. Chromium<1%
  16. Nitrite<1%
  17. Cadmium<1%
  • pH 7.68 pH
  • Conductivity 545 µS/cm
  • Phosphate 1.03 mg/L
All 20 results as a table
SubstanceResultLegal limitShare of limit
Colour0.8 mg/L Pt/Co20 mg/L Pt/Co
4%
pH7.68 pHNo legal limit–
Turbidity0.12 NTU4 NTU
3%
Conductivity545 µS/cmNo legal limit–
Antimony0.000059 mg/L0.005 mg/L
1%
Selenium0.00035 mg/L0.04 mg/L
<1%
Trihalomethanes0.00717 mg/L0.1 mg/L
7%
Nitrate37.5 mg/L50 mg/L
75%
Nitrite0.003 mg/L0.5 mg/L
<1%
Aluminium0.021 mg/L0.2 mg/L
11%
Iron0.007 mg/L0.2 mg/L
3%
Manganese0.00073 mg/L0.05 mg/L
1%
Copper0.147 mg/L2 mg/L
7%
Fluoride0.1 mg/L1.5 mg/L
7%
Arsenic0.00681 mg/L0.01 mg/L
68%
Cadmium0.00001 mg/L0.005 mg/L
<1%
Chromium0.00042 mg/L0.05 mg/L
<1%
Nickel0.0063 mg/L0.02 mg/L
32%
Lead0.0013 mg/L0.01 mg/L
13%
Phosphate1.03 mg/LNo legal limit–
Outside your tap

Your river is the Brockton Brook from Source to R Sow, rated moderate

The Environment Agency rated the Brockton Brook from Source to R Sow as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by water plants and algae and phosphate. 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

Within 10 km

6

forever-chemical detections in nearby rivers and groundwater

At 2 sites. The highest was PFBA at 0.0017 µg/L, at SSN0042 Beechdale Lane - Swynnerton Brook, 8.4 km away, in November 2025. These are river and borehole samples, not tests of your tap water.

Every PFAS sample around Stoke-on-Trent · Which filters remove PFAS · PFAS explained

ST21 in short

Tap water in ST21 (Stafford) is supplied by Severn Trent in the Stafford Central zone and scores 8.3 out of 10, against an England and Wales average of 9.0. None of the 20 tested substances came close to a limit. The latest sample is from 23 December 2025.

  • The lowest score of the 7 areas tested in StaffordST21 scores 8.3 out of 10. The best in Stafford, ST12, scores 9.
  • Nitrate is the reading closest to its limit, at 75% of the 50 mg/L maximumIt passed, but with less headroom than anything else tested here. Worth watching in the next round of results. See every reading
  • 0.7 points below the national average of 9Below the typical tested district in the UK, which is worth knowing before you choose a filter. Compare every area

Next door

ST129.0 out of 10ST158.8 out of 10ST168.9 out of 10ST179.0 out of 10ST189.0 out of 10ST208.3 out of 10

Questions about ST21 water

Is ST21 tap water safe to drink?

Based on the latest tests, ST21 (Stafford) water scores 8.3/10, which is safe. 0 of 20 tested contaminants exceeded recommended levels. Water is supplied by Severn Trent.

What contaminants are in ST21 water?

We tested 20 contaminants in ST21 water. None exceeded recommended safe levels. PFAS (forever chemicals) were also measured in rivers and groundwater within 10 km, though not in the tap-water tests themselves.

Who supplies water in ST21?

ST21 (Stafford) is supplied by Severn Trent. You can view their full profile and compliance data on our supplier page.

Should I use a water filter in ST21?

ST21 water scored 8.3/10 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 ST21 water?

The tap-water tests we hold for ST21 do not include a PFAS result. Environment Agency monitoring found PFAS in 6 river and groundwater samples from 2 sites within 10 km of ST21, the highest being PFBA at 0.0017 µg/L about 8.4 km away. These are environmental samples, not tests of tap water. The UK currently has no legal limit for PFAS in drinking water; the Drinking Water Inspectorate uses a 0.1 µg/L guideline for individual compounds. Reverse osmosis filters can reduce PFAS levels.

How clean is the river near ST21?

The Environment Agency rated the Brockton Brook from Source to R Sow as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by water plants and algae and phosphate. 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 river, not of tap water in ST21, which is treated before it reaches homes.

Keep reading

PFAS explainedHow to test your waterBest water filtersFilter shower headsWater testing kitsUK water rankingsWater hardness checkerWater hardness map

River and groundwater readings near ST21

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.

SubstanceReadingDrinking water limit
pH8.61 pHNone
Temperature7.3 °CNone
Conductivity578 µS/cmNone
Nitrate5.6 mg/L50 mg/L
Nitrite0.015 mg/L0.5 mg/L
Phosphate0.01 mg/LNone
Dissolved Oxygen14 mg/LNone
Ammonia0.057 mg/L0.5 mg/L
Zinc0.00635 mg/LNone
Copper0.00205 mg/L2 mg/L

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We'll email you when water quality data changes for ST21.

Source: Severn Trent test results, published through the Stream Water Data Portal; rivers and PFAS from the Environment Agency. Page updated . How we score · Where the data comes from