S21 tap water: what's in it?
Severn Trent Water: at least 40 tests failed UK drinking-water standards in 2025 (DWI, company-wide).
Some published DWI figures don't reconcile or identify a company, so we've left them out; the true number may be higher. England overall: 99.97% of tests met standards.
S21 tap water quality report · 2026
Hardness
Slightly hard
Sheffield South (supply zone) · 1 August 2025 to 31 July 2026
Details
Sheffield South (supply zone) · 1 August 2025 to 31 July 2026
Hosepipe ban
Not available
We can't confirm the hosepipe-ban status for Severn Trent Water from the information we hold.
Details
We can't confirm the hosepipe-ban status for Severn Trent Water from the information we hold.
Storm overflows
122 overflows within 10 km of S21 centre
2,199 spills in 2025
Details
2,199 spills in 2025
Lead pipes
51% built before 1973
Estimate, not a test. Homes in the parts of S21 we can match to council-tax records (100% of its postcodes) whose build period is known; the share with no recorded build period isn't published for these areas. Allowing for suppressed counts: 49–51%. England and Wales: 61% (2026).
Details
Estimate, not a test. Homes in the parts of S21 we can match to council-tax records (100% of its postcodes) whose build period is known; the share with no recorded build period isn't published for these areas. Allowing for suppressed counts: 49–51%. England and Wales: 61% (2026).
Who supplies water in S21
Supplies 466 of 466 postcodes (100%)
Sewerage: Usually Severn Trent Water — they provide water and sewerage across most of their area. Your water bill confirms yours.
Drinking-water test record
Severn Trent Water: 466 of 466 postcodes
Severn Trent Water
Severn Trent Water, company-wide
- Regulator
- DWI
- Report year
- 2025
- Failed tests
- Not shown
- Tests
- 452,303
The regulator's published total and its company rows disagree, so we don't show a count.
| Parameter | Failed tests |
|---|---|
| Benzo[a]Pyrene (total) | Failed tests: 1 |
| E. coli (confirmed) | Failed tests: 3 |
| Iron | Failed tests: 15 |
| Lead | Failed tests: 4 |
| Manganese | Failed tests: 2 |
| Nickel | Failed tests: 6 |
| Total coliforms (confirmed) | Failed tests: 8 |
| Turbidity – indicator | Failed tests: 1 |
Source: DWI england 2025, Annex B — dated 6 July 2026, read 13 October 2026
Source: DWI england 2025, Annex A — dated 6 July 2026, read 13 October 2026
England: 99.97% of tests met standards in 2025 (DWI).
Source: DWI england 2025, national compliance — dated 6 July 2026, read 13 October 2026
How hard is the water in S21?
Across S21's supply zones, hardness ranges from 51 mg/l (soft) to 298 mg/l (hard). Those 5 zones cover 96% of its postcodes.
5 identified supply zones in S21
Sheffield South · Severn Trent Water (195 of 466 postcodes)
127 mg/l · 8.9 °Clark · 7.1 °dH · 12.7 °fH
Typical value.
Sheffield South (supply zone) · 1 August 2025 to 31 July 2026
Source: Severn Trent Water — dated 1 August 2025 to 31 July 2026, read 30 September 2026
Spinkhill · Severn Trent Water (184 of 466 postcodes)
131 mg/l · 9.2 °Clark · 7.3 °dH · 13.1 °fH
Typical value.
Spinkhill (supply zone) · 1 August 2025 to 31 July 2026
Source: Severn Trent Water — dated 1 August 2025 to 31 July 2026, read 30 September 2026
Higham · Severn Trent Water (38 of 466 postcodes)
126 mg/l · 8.8 °Clark · 7.1 °dH · 12.6 °fH
Typical value.
Higham (supply zone) · 1 August 2025 to 31 July 2026
Source: Severn Trent Water — dated 1 August 2025 to 31 July 2026, read 30 September 2026
Chesterfield East · Severn Trent Water (22 of 466 postcodes)
51 mg/l · 3.6 °Clark · 2.9 °dH · 5.1 °fH
Typical value.
Chesterfield East (supply zone) · 1 August 2025 to 31 July 2026
Source: Severn Trent Water — dated 1 August 2025 to 31 July 2026, read 30 September 2026
Barlborough · Severn Trent Water (7 of 466 postcodes)
298 mg/l · 20.9 °Clark · 16.7 °dH · 29.8 °fH
Typical value.
Barlborough (supply zone) · 1 August 2025 to 31 July 2026
Source: Severn Trent Water — dated 1 August 2025 to 31 July 2026, read 30 September 2026
20 postcodes without an identified supply zone
Severn Trent Water (20 of 466 postcodes)
We do not have a verified hardness figure for this area. Ask your water company for its water quality report.
Storm overflows nearby
122 overflows within 10 km of S21 centre · 2,199 spills in 2025
S21 (district) · 2025
Source: Environment Agency EDM annual return 2025 — dated 20 August 2026, read 13 October 2026
Overflows here are run by Severn Trent Water and Yorkshire Water.
94 of these were monitored for only part of 2025.
Nearest 5 shown
ECKINGTON CSO
Into RIVER MOSS · 0.4 km from the centre of S21
22 spills · 21.3 hours · Monitored 100% of 2025
ROTHERSIDE ROAD CSO
Into RIVER MOSS · 0.6 km from the centre of S21
1 spill · 0.3 hours · Monitored 60% of 2025
MARKET STREET CS0
Into THE MOSS · 0.8 km from the centre of S21
6 spills · 1.8 hours · Monitored 100% of 2025
WESTTHORPE NO 2 CSO
Into PARK BROOK · 1.4 km from the centre of S21
10 spills · 13.3 hours · Monitored 100% of 2025
RENISHAW STW
Into SMITHY BROOK · 1.6 km from the centre of S21
60 spills · 679.3 hours · Monitored 100% of 2025
Annual 2025 figures from monitored overflows. Not live, and not a bathing-water or tap-water verdict.
- 57 England outfalls in the 2025 return had no usable location and aren't counted.
- Northern Ireland isn't covered: No licensed annual per-outfall source in the approved source list; BT postcode coordinates require an LPS licence.
Older homes and lead pipes
51% built before 1973
51% of homes here were built before 1973 — estimate, not a test.
Homes in the parts of S21 we can match to council-tax records (100% of its postcodes) whose build period is known; the share with no recorded build period isn't published for these areas. Allowing for suppressed counts: 49–51%. England and Wales: 61% (2026).
Older homes are more likely to have lead pipes. Only a test tells you whether yours does.
S21 (district) · 2026
Source: Valuation Office Agency, Council Tax: stock of properties — dated 31 March 2026, read 24 September 2026
Fluoride
We cannot confirm whether this area is part of a water fluoridation scheme. Ask your water supplier using your postcode.
Around one in ten people in England receive drinking water supplied by a fluoridation scheme.
England · 2026 health monitoring report
Source: UKHSA and DHSC — dated 30 March 2026, read 13 October 2026
Hosepipe bans
What you can do
As an Amazon Associate we earn from qualifying purchases. Links go to amazon.com; Amazon's Earn Globally service can localise them to amazon.co.uk. Check the model and UK delivery before buying.
Water filter jugs
LifeStraw
LSH7GLSPK21
Performance certification:
Certified by WQA to NSF/ANSI 42 for Aesthetic Chlorine and Taste and Odor; Certified by WQA to NSF/ANSI 53 for Lead and Mercury; Certified by WQA to NSF/ANSI 401 for Microplastics (a US/international standard; it is not UK approval)
View Detailsreduces chlorine taste and odour in drinking water.
A UK retailer lists this model. Amazon UK stock and delivery are unverified; this Amazon link may not ship to the UK. Check the exact model and UK delivery before you pay.
UK availability evidence checked 14 October 2026.
Shower filters
Weddell Water
WD-100BL
Performance certification:
Certified by NSF to NSF/ANSI 177 for Free Available Chlorine Reduction (a US/international standard; it is not UK approval)
View Detailsreduces chlorine in shower water; does not soften water.
A UK retailer lists this model. Amazon UK stock and delivery are unverified; this Amazon link may not ship to the UK. Check the exact model and UK delivery before you pay.
Check it fits your shower fitting before buying; a US fitting may need an adaptor.
UK availability evidence checked 14 October 2026.
We haven't verified a lead test kit for UK buyers yet.
What a pick has to pass:
- A lead result reported by a laboratory accredited for that test (UKAS, ISO/IEC 17025), named on the kit's listing
- UK availability evidenced by Amazon UK, the manufacturer or a UK retailer, checked in the last 90 days
Start with your water company: if you think you have lead pipes, you can ask it to test the water at your kitchen tap. Which water test you need
Common water problems
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Water softener cost UK 2026: price by home size
Why is my tap water cloudy or white?
Why is my tap water cloudy or white? (UK)
Brown tap water: causes and what to do (UK)
Why does my tap water taste metallic?
Tap water tastes metallic? Causes and fixes (UK)
Questions about tap water in S21
- Is the water in S21 hard or soft?
- Severn Trent Water: slightly hard, 127 mg/l, 8.9 °Clark, 7.1 °dH, 12.7 °fH (Sheffield South (supply zone), 1 August 2025 to 31 July 2026). Typical value. Severn Trent Water: slightly hard, 131 mg/l, 9.2 °Clark, 7.3 °dH, 13.1 °fH (Spinkhill (supply zone), 1 August 2025 to 31 July 2026). Typical value. Severn Trent Water: slightly hard, 126 mg/l, 8.8 °Clark, 7.1 °dH, 12.6 °fH (Higham (supply zone), 1 August 2025 to 31 July 2026). Typical value. Severn Trent Water: soft, 51 mg/l, 3.6 °Clark, 2.9 °dH, 5.1 °fH (Chesterfield East (supply zone), 1 August 2025 to 31 July 2026). Typical value. Severn Trent Water: We do not have a verified hardness figure for this area. Ask your water company for its water quality report. Severn Trent Water: hard, 298 mg/l, 20.9 °Clark, 16.7 °dH, 29.8 °fH (Barlborough (supply zone), 1 August 2025 to 31 July 2026). Typical value.
- What does the drinking water regulator's record show for S21?
- Severn Trent Water: at least 40 tests failed UK drinking-water standards in 2025 (DWI, company-wide). Some published DWI figures don't reconcile or identify a company, so we've left them out; the true number may be higher. England overall: 99.97% of tests met standards.
- Could homes in S21 have lead pipes?
- 51% of homes here were built before 1973 — estimate, not a test. Homes in the parts of S21 we can match to council-tax records (100% of its postcodes) whose build period is known; the share with no recorded build period isn't published for these areas. Allowing for suppressed counts: 49–51%. England and Wales: 61% (2026). Older homes are more likely to have lead pipes. Only a test tells you whether yours does.
- Is the water in S21 fluoridated?
- We cannot confirm whether this area is part of a water fluoridation scheme. Ask your water supplier using your postcode. Around one in ten people in England receive drinking water supplied by a fluoridation scheme.
Sources and method
- Water Company Boundaries (UC2) ↗ · 19 September 2026 · read 20 September 2026
- Severn Trent Water contact page ↗ · 13 October 2026 · read 13 October 2026
- DWI england 2025, Annex B ↗ · 2025 · read 13 October 2026
- DWI england 2025, national compliance ↗ · 2025 · read 13 October 2026
- Severn Trent Water ↗ · 1 August 2025 to 31 July 2026 · read 30 September 2026
- Environment Agency EDM annual return 2025 ↗ · 2025 · read 13 October 2026
- Valuation Office Agency, Council Tax: stock of properties ↗ · 2026 · read 24 September 2026
- UKHSA and DHSC ↗ · 2026 health monitoring report · read 13 October 2026
Severn Trent Water contact page, Severn Trent Water, Severn Trent Water, Severn Trent Water, Severn Trent Water, Severn Trent Water: Database right, used under the publisher's terms.
Water company boundaries © Water UK, licensed under CC BY 4.0Contains public sector information licensed under the Open Government Licence v3.0
Data generation uk-2026-10-16-derive6