CA1 tap water: what's in it?
United Utilities: at least 57 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.
CA1 tap water quality report · 2026
Hardness
Slightly hard
Carlisle South (supply zone) · 12-month average, updated 25 September 2026; 57 samples
Details
Carlisle South (supply zone) · 12-month average, updated 25 September 2026; 57 samples
Hosepipe ban
Not available
We can't confirm the hosepipe-ban status for United Utilities from the information we hold.
Details
We can't confirm the hosepipe-ban status for United Utilities from the information we hold.
Storm overflows
47 overflows within 10 km of CA1 centre
1,098 spills in 2025
Details
1,098 spills in 2025
Lead pipes
67% built before 1973
Estimate, not a test. Homes in the parts of CA1 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: 66–67%. England and Wales: 61% (2026).
Details
Estimate, not a test. Homes in the parts of CA1 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: 66–67%. England and Wales: 61% (2026).
Who supplies water in CA1
Supplies 674 of 674 postcodes (100%)
Sewerage: Usually United Utilities — they provide water and sewerage across most of their area. Your water bill confirms yours.
Drinking-water test record
United Utilities: 674 of 674 postcodes
United Utilities
United Utilities, company-wide
- Regulator
- DWI
- Report year
- 2025
- Failed tests
- Not shown
- Tests
- 385,673
The regulator's published total and its company rows disagree, so we don't show a count.
| Parameter | Failed tests |
|---|---|
| Aluminium | Failed tests: 5 |
| E. coli (confirmed) | Failed tests: 4 |
| Iron | Failed tests: 18 |
| Lead | Failed tests: 7 |
| Manganese | Failed tests: 7 |
| Nickel | Failed tests: 3 |
| Total coliforms (confirmed) | Failed tests: 13 |
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 CA1?
97% of CA1's postcodes are in the Carlisle South supply zone (United Utilities): 101 mg/l, slightly hard.
Carlisle South · United Utilities (657 of 674 postcodes)
101 mg/l · 7.1 °Clark · 5.7 °dH · 10.1 °fH
Zone average of 57 samples.
Carlisle South (supply zone) · 12-month average, updated 25 September 2026; 57 samples
Source: United Utilities — dated 12-month average, updated 25 September 2026, read 28 September 2026
2 identified supply zones in CA1
Carlisle South · United Utilities (657 of 674 postcodes)
101 mg/l · 7.1 °Clark · 5.7 °dH · 10.1 °fH
Zone average of 57 samples.
Carlisle South (supply zone) · 12-month average, updated 25 September 2026; 57 samples
Source: United Utilities — dated 12-month average, updated 25 September 2026, read 28 September 2026
Carlisle North · United Utilities (3 of 674 postcodes)
103 mg/l · 7.2 °Clark · 5.8 °dH · 10.3 °fH
Zone average of 40 samples.
Carlisle North (supply zone) · 12-month average, updated 25 September 2026; 40 samples
Source: United Utilities — dated 12-month average, updated 25 September 2026, read 28 September 2026
14 postcodes without an identified supply zone
United Utilities (14 of 674 postcodes)
We do not have a verified hardness figure for this area. Ask your water company for its water quality report.
Storm overflows nearby
47 overflows within 10 km of CA1 centre · 1,098 spills in 2025
CA1 (district) · 2025
Source: Environment Agency EDM annual return 2025 — dated 20 August 2026, read 13 October 2026
Overflows here are run by United Utilities.
37 of these were monitored for only part of 2025.
Nearest 5 shown
PETTERIL RAILWAY BRIDGE CSO
Into RIVER PETTERIL · 0.3 km from the centre of CA1
10 spills · 38.6 hours · Monitored 99.7% of 2025
MELBOURNE PARK CSO
Into River Petterill · 0.4 km from the centre of CA1
16 spills · 36.8 hours · Monitored 97.3% of 2025
WARICK ROADWWNW PS
Into RIVER PETTERIL · 1.2 km from the centre of CA1
20 spills · 10.5 hours · Monitored 100% of 2025
GILFORD PARK CSO (10542)
Into RIVER PETTERIL · 1.3 km from the centre of CA1
13 spills · 12.2 hours · Monitored 100% of 2025
NEAR TRINITY SCHOOL
Into RIVER EDEN · 1.6 km from the centre of CA1
65 spills · 215.4 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
67% built before 1973
67% of homes here were built before 1973 — estimate, not a test.
Homes in the parts of CA1 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: 66–67%. England and Wales: 61% (2026).
Older homes are more likely to have lead pipes. Only a test tells you whether yours does.
CA1 (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
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Tap water tastes metallic? Causes and fixes (UK)
Questions about tap water in CA1
- Is the water in CA1 hard or soft?
- United Utilities: slightly hard, 101 mg/l, 7.1 °Clark, 5.7 °dH, 10.1 °fH (Carlisle South (supply zone), 12-month average, updated 25 September 2026; 57 samples). Zone average of 57 samples. United Utilities: We do not have a verified hardness figure for this area. Ask your water company for its water quality report. United Utilities: slightly hard, 103 mg/l, 7.2 °Clark, 5.8 °dH, 10.3 °fH (Carlisle North (supply zone), 12-month average, updated 25 September 2026; 40 samples). Zone average of 40 samples.
- What does the drinking water regulator's record show for CA1?
- United Utilities: at least 57 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 CA1 have lead pipes?
- 67% of homes here were built before 1973 — estimate, not a test. Homes in the parts of CA1 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: 66–67%. 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 CA1 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
- United Utilities 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
- United Utilities ↗ · 12-month average, updated 25 September 2026; 57 samples · read 28 September 2026
- United Utilities ↗ · 12-month average, updated 25 September 2026; 40 samples · 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
United Utilities contact page, United Utilities, United Utilities: 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