YO21 tap water: what's in it?
Yorkshire Water: at least 69 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.
YO21 tap water quality report · 2026
Hardness
Soft
Esk Valley 2004 (supply zone) · 1 January 2024 to 31 December 2024
Details
Esk Valley 2004 (supply zone) · 1 January 2024 to 31 December 2024
Hosepipe ban
No hosepipe ban
Checked 11 October 2026 at 02:34
Details
Checked 11 October 2026 at 02:34
Storm overflows
40 overflows within 10 km of YO21 centre
705 spills in 2025
Details
705 spills in 2025
Lead pipes
69% built before 1973
Estimate, not a test. Homes in the parts of YO21 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: 67–69%. England and Wales: 61% (2026).
Details
Estimate, not a test. Homes in the parts of YO21 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: 67–69%. England and Wales: 61% (2026).
Who supplies water in YO21
Supplies 665 of 680 postcodes (98%)
Sewerage: Usually Yorkshire Water — they provide water and sewerage across most of their area. Your water bill confirms yours.
Also supplied here: Northumbrian Water (15 of 680 postcodes (2%))
Drinking-water test record
Yorkshire Water: 665 of 680 postcodes
Yorkshire Water
Yorkshire Water, company-wide
- Regulator
- DWI
- Report year
- 2025
- Failed tests
- Not shown
- Tests
- 388,919
The regulator's published total and its company rows disagree, so we don't show a count.
| Parameter | Failed tests |
|---|---|
| E. coli (confirmed) | Failed tests: 4 |
| Enterococci (confirmed) | Failed tests: 2 |
| Iron | Failed tests: 20 |
| Lead | Failed tests: 6 |
| Nickel | Failed tests: 7 |
| Total coliforms (confirmed) | Failed tests: 30 |
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
Northumbrian Water: 15 of 680 postcodes
Northumbrian Water
Northumbrian, Essex and Suffolk Water group, includes Northumbrian Water
- Regulator
- DWI
- Report year
- 2025
- Failed tests
- Not shown
- Tests
- 266,202
The regulator's published total and its company rows disagree, so we don't show a count.
| Parameter | Failed tests |
|---|---|
| Aluminium | Failed tests: 4 |
| E. coli (confirmed) | Failed tests: 3 |
| Enterococci (confirmed) | Failed tests: 1 |
| Iron | Failed tests: 9 |
| Lead | Failed tests: 5 |
| Manganese | Failed tests: 3 |
| Nickel | Failed tests: 2 |
| Nitrite – consumers taps | Failed tests: 1 |
| Sodium | Failed tests: 1 |
| Total coliforms (confirmed) | Failed tests: 7 |
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 YO21?
90% of YO21's postcodes are in the Esk Valley 2004 supply zone (Yorkshire Water): 63 mg/l, soft.
Esk Valley 2004 · Yorkshire Water (615 of 680 postcodes)
63 mg/l · 4.4 °Clark · 3.6 °dH · 6.3 °fH
Zone average.
Esk Valley 2004 (supply zone) · 1 January 2024 to 31 December 2024
Source: Yorkshire Water — dated 1 January 2024 to 31 December 2024, read 29 September 2026
2 identified supply zones in YO21
Esk Valley 2004 · Yorkshire Water (615 of 680 postcodes)
63 mg/l · 4.4 °Clark · 3.6 °dH · 6.3 °fH
Zone average.
Esk Valley 2004 (supply zone) · 1 January 2024 to 31 December 2024
Source: Yorkshire Water — dated 1 January 2024 to 31 December 2024, read 29 September 2026
Nunthorpe Zone · Northumbrian Water (6 of 680 postcodes)
125 mg/l · 8.8 °Clark · 7.0 °dH · 12.5 °fH
Zone average.
Nunthorpe Zone (supply zone) · January 2025 to December 2025
Source: Northumbrian Water — dated January 2025 to December 2025, read 28 September 2026
59 postcodes without an identified supply zone
Yorkshire Water (50 of 680 postcodes)
We do not have a verified hardness figure for this area. Ask your water company for its water quality report.
Northumbrian Water (9 of 680 postcodes)
We do not have a verified hardness figure for this area. Ask your water company for its water quality report.
Storm overflows nearby
40 overflows within 10 km of YO21 centre · 705 spills in 2025
YO21 (district) · 2025
Source: Environment Agency EDM annual return 2025 — dated 20 August 2026, read 13 October 2026
Overflows here are run by Yorkshire Water.
28 of these were monitored for only part of 2025.
Nearest 5 shown
AISLABY SEWAGE PUMPING STATION
Into DITCH · 2.3 km from the centre of YO21
1 spill · 4 hours · Monitored 99.8% of 2025
IVY HOUSE CSO
Into TRIB OF RIVER ESK · 2.7 km from the centre of YO21
2 spills · 1 hours · Monitored 100% of 2025
BROOK PARK NO2 CSO
Into TRIBUTARY OF RIVER ESK · 3.6 km from the centre of YO21
6 spills · 12.8 hours · Monitored 100% of 2025
LOWDALE LANE NO 2 CSO
Into IBURNDALE BECK · 3.8 km from the centre of YO21
19 spills · 64.3 hours · Monitored 100% of 2025
BIRCH AVENUE CSO
Into IBURNDALE BECK · 4.1 km from the centre of YO21
1 spill · 0.3 hours · Monitored 99.2% 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
69% built before 1973
69% of homes here were built before 1973 — estimate, not a test.
Homes in the parts of YO21 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: 67–69%. England and Wales: 61% (2026).
Older homes are more likely to have lead pipes. Only a test tells you whether yours does.
YO21 (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 YO21
- Is the water in YO21 hard or soft?
- Yorkshire Water: soft, 63 mg/l, 4.4 °Clark, 3.6 °dH, 6.3 °fH (Esk Valley 2004 (supply zone), 1 January 2024 to 31 December 2024). Zone average. Yorkshire Water: We do not have a verified hardness figure for this area. Ask your water company for its water quality report. Northumbrian Water: We do not have a verified hardness figure for this area. Ask your water company for its water quality report. Northumbrian Water: slightly hard, 125 mg/l, 8.8 °Clark, 7.0 °dH, 12.5 °fH (Nunthorpe Zone (supply zone), January 2025 to December 2025). Zone average.
- What does the drinking water regulator's record show for YO21?
- Yorkshire Water: at least 69 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 YO21 have lead pipes?
- 69% of homes here were built before 1973 — estimate, not a test. Homes in the parts of YO21 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: 67–69%. 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 YO21 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
- Yorkshire 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
- Yorkshire Water ↗ · 1 January 2024 to 31 December 2024 · read 29 September 2026
- Northumbrian Water ↗ · January 2025 to December 2025 · read 28 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
- Yorkshire Water ↗ · 11 October 2026 · read 11 October 2026
Yorkshire Water contact page, Yorkshire Water, Northumbrian Water, Yorkshire 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