DL11 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.
DL11 tap water quality report · 2026
Hardness
Hard
Catterick and Richmond 2019 (supply zone) · 1 January 2024 to 31 December 2024
Details
Catterick and Richmond 2019 (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
9 overflows within 10 km of DL11 centre
413 spills in 2025
Details
413 spills in 2025
Lead pipes
72% built before 1973
Estimate, not a test. Homes in the parts of DL11 we can match to council-tax records (100% of its postcodes) whose build period is known; 3% have no recorded build period. Allowing for suppressed counts: 68–73%. England and Wales: 61% (2026).
Details
Estimate, not a test. Homes in the parts of DL11 we can match to council-tax records (100% of its postcodes) whose build period is known; 3% have no recorded build period. Allowing for suppressed counts: 68–73%. England and Wales: 61% (2026).
Who supplies water in DL11
Supplies 418 of 453 postcodes (92%)
Sewerage: Usually Yorkshire Water — they provide water and sewerage across most of their area. Your water bill confirms yours.
Also supplied here: Northumbrian Water (32 of 453 postcodes (7%))
Boundary or unplaced: 3 postcodes
Drinking-water test record
Yorkshire Water: 418 of 453 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: 32 of 453 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 DL11?
Across DL11's supply zones, hardness ranges from 77 mg/l (soft) to 227 mg/l (hard). Those 3 zones cover 75% of its postcodes.
3 identified supply zones in DL11
Catterick and Richmond 2019 · Yorkshire Water (178 of 453 postcodes)
227 mg/l · 16.0 °Clark · 12.7 °dH · 22.7 °fH
Zone average.
Catterick and Richmond 2019 (supply zone) · 1 January 2024 to 31 December 2024
Source: Yorkshire Water — dated 1 January 2024 to 31 December 2024, read 28 September 2026
Dales 2015 · Yorkshire Water (139 of 453 postcodes)
119 mg/l · 8.3 °Clark · 6.6 °dH · 11.9 °fH
Zone average.
Dales 2015 (supply zone) · 1 January 2024 to 31 December 2024
Source: Yorkshire Water — dated 1 January 2024 to 31 December 2024, read 30 September 2026
Lartington WTW to Longnewton Zone · Northumbrian Water (22 of 453 postcodes)
77 mg/l · 5.4 °Clark · 4.3 °dH · 7.7 °fH
Zone average.
Lartington WTW to Longnewton Zone (supply zone) · January 2025 to December 2025
Source: Northumbrian Water — dated January 2025 to December 2025, read 28 September 2026
111 postcodes without an identified supply zone
Yorkshire Water (101 of 453 postcodes)
We do not have a verified hardness figure for this area. Ask your water company for its water quality report.
Northumbrian Water (10 of 453 postcodes)
We do not have a verified hardness figure for this area. Ask your water company for its water quality report.
Storm overflows nearby
9 overflows within 10 km of DL11 centre · 413 spills in 2025
DL11 (district) · 2025
Source: Environment Agency EDM annual return 2025 — dated 20 August 2026, read 13 October 2026
Overflows here are run by Northumbrian Water and Yorkshire Water.
9 of these were monitored for only part of 2025.
Nearest 5 shown
MARSKE SEWAGE TREATMENT WORKS
Into MARSKE BECK · 5 km from the centre of DL11
170 spills · 2,045.8 hours · Monitored 99.6% of 2025
Permit applied for
Into Permit applied for · 5.9 km from the centre of DL11
21 spills · 161.8 hours · Monitored 99.7% of 2025
BARNINGHAM STW
Into NOR BECK · 6 km from the centre of DL11
10 spills · 38.6 hours · Monitored 100% of 2025
RAVENSWORTH SEWAGE PUMPING STATION
Into HOLME BECK · 6.8 km from the centre of DL11
45 spills · 234.5 hours · Monitored 99.5% of 2025
REETH/FREMINGTON/GRINTON STW
Into ARKLE BECK · 7.1 km from the centre of DL11
43 spills · 76 hours · Monitored 99.9% 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
72% built before 1973
72% of homes here were built before 1973 — estimate, not a test.
Homes in the parts of DL11 we can match to council-tax records (100% of its postcodes) whose build period is known; 3% have no recorded build period. Allowing for suppressed counts: 68–73%. England and Wales: 61% (2026).
Older homes are more likely to have lead pipes. Only a test tells you whether yours does.
DL11 (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 water softener for UK buyers yet.
What a pick has to pass:
- An exact-model listing from NSF, WQA or IAPMO for the model sold in the UK
- Listed to NSF/ANSI 44, the water softener standard
- The manufacturer's documented feed connection and water-pressure range, so a plumber can check them against UK pipework
- UK availability evidenced by Amazon UK, the manufacturer or a UK retailer, checked in the last 90 days
Until we can recommend one, see what a softener costs to buy, fit and run in the UK. Water softener cost
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
How much does a water softener cost in the UK?
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 DL11
- Is the water in DL11 hard or soft?
- Yorkshire Water: hard, 227 mg/l, 16.0 °Clark, 12.7 °dH, 22.7 °fH (Catterick and Richmond 2019 (supply zone), 1 January 2024 to 31 December 2024). Zone average. Yorkshire Water: slightly hard, 119 mg/l, 8.3 °Clark, 6.6 °dH, 11.9 °fH (Dales 2015 (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: soft, 77 mg/l, 5.4 °Clark, 4.3 °dH, 7.7 °fH (Lartington WTW to Longnewton Zone (supply zone), January 2025 to December 2025). Zone average. Northumbrian Water: We do not have a verified hardness figure for this area. Ask your water company for its water quality report.
- What does the drinking water regulator's record show for DL11?
- 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 DL11 have lead pipes?
- 72% of homes here were built before 1973 — estimate, not a test. Homes in the parts of DL11 we can match to council-tax records (100% of its postcodes) whose build period is known; 3% have no recorded build period. Allowing for suppressed counts: 68–73%. 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 DL11 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 28 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, 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