SY18 tap water: what's in it?
Hafren Dyfrdwy: at least 12 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. Wales overall: 99.97% of tests met standards.
SY18 tap water quality report · 2026
Hardness
Soft
Newtown (supply zone) · 1 August 2025 to 31 July 2026
Details
Newtown (supply zone) · 1 August 2025 to 31 July 2026
Hosepipe ban
No hosepipe ban
Checked 11 October 2026 at 02:34
Details
Checked 11 October 2026 at 02:34
Storm overflows
6 overflows within 10 km of SY18 centre
141 spills in 2025
Details
141 spills in 2025
Lead pipes
66% built before 1973
Estimate, not a test. Homes in the parts of SY18 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: 64–66%. England and Wales: 61% (2026).
Details
Estimate, not a test. Homes in the parts of SY18 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: 64–66%. England and Wales: 61% (2026).
Who supplies water in SY18
Supplies 220 of 226 postcodes (97%)
We can't confirm your sewerage company from official data for this area.
Also supplied here: Dŵr Cymru Welsh Water (4 of 226 postcodes (2%))
Boundary or unplaced: 2 postcodes
Drinking-water test record
Hafren Dyfrdwy: 220 of 226 postcodes
Hafren Dyfrdwy
Hafren Dyfrdwy, company-wide
- Regulator
- DWI
- Report year
- 2025
- Failed tests
- Not shown
- Tests
- Not given in the report
The regulator's published total and its company rows disagree, so we don't show a count.
| Parameter | Failed tests |
|---|---|
| Coliform bacteria (indicator) | Failed tests: 9 |
| Colour | Failed tests: 1 |
| Total coliforms (confirmed) | Failed tests: 1 |
| Turbidity – indicator | Failed tests: 1 |
Source: DWI wales 2025, Annex B — dated 14 July 2026, read 13 October 2026
Source: DWI wales 2025, Annex A — dated 14 July 2026, read 13 October 2026
Wales: 99.97% of tests met standards in 2025 (DWI).
Source: DWI wales 2025, national compliance — dated 9 July 2026, read 13 October 2026
Dŵr Cymru Welsh Water: 4 of 226 postcodes
Dŵr Cymru Welsh Water
Dŵr Cymru Welsh Water, company-wide
- Regulator
- DWI
- Report year
- 2025
- Failed tests
- Not shown
- Tests
- Not given in the report
The regulator's published total and its company rows disagree, so we don't show a count.
| Parameter | Failed tests |
|---|---|
| Coliform bacteria (indicator) | Failed tests: 24 |
| E. coli (confirmed) | Failed tests: 2 |
| Lead | Failed tests: 2 |
| Manganese | Failed tests: 1 |
| Odour | Failed tests: 5 |
| Taste (quantitative) | Failed tests: 5 |
| Total coliforms (confirmed) | Failed tests: 20 |
Source: DWI wales 2025, Annex B — dated 14 July 2026, read 13 October 2026
Source: DWI wales 2025, Annex A — dated 14 July 2026, read 13 October 2026
Wales: 99.97% of tests met standards in 2025 (DWI).
Source: DWI wales 2025, national compliance — dated 9 July 2026, read 13 October 2026
How hard is the water in SY18?
95% of SY18's postcodes are in the Newtown supply zone (Hafren Dyfrdwy): 56 mg/l, soft.
Newtown · Hafren Dyfrdwy (215 of 226 postcodes)
56 mg/l · 3.9 °Clark · 3.1 °dH · 5.6 °fH
Typical value.
Newtown (supply zone) · 1 August 2025 to 31 July 2026
Source: Hafren Dyfrdwy — dated 1 August 2025 to 31 July 2026, read 1 October 2026
1 identified supply zones in SY18
Newtown · Hafren Dyfrdwy (215 of 226 postcodes)
56 mg/l · 3.9 °Clark · 3.1 °dH · 5.6 °fH
Typical value.
Newtown (supply zone) · 1 August 2025 to 31 July 2026
Source: Hafren Dyfrdwy — dated 1 August 2025 to 31 July 2026, read 1 October 2026
9 postcodes without an identified supply zone
Hafren Dyfrdwy (5 of 226 postcodes)
We do not have a verified hardness figure for this area. Ask your water company for its water quality report.
Dŵr Cymru Welsh Water (4 of 226 postcodes)
We do not have a verified hardness figure for this area. Ask your water company for its water quality report.
Storm overflows nearby
6 overflows within 10 km of SY18 centre · 141 spills in 2025
SY18 (district) · 2025
Source: The Rivers Trust (EA/NRW EDM 2025) — dated 8 September 2026, read 13 October 2026
Overflows here are run by Dwr Cymru Welsh Water and Hafren Dyfrdwy.
6 of these were monitored for only part of 2025.
Nearest 5 shown
LLANIDLOES - SHORTBRIDGE STREET, LONGBRIDGE SOUTH & LONGBRIDGE NORTH (CSO)
Receiving water not named in the return · 0.9 km from the centre of SY18
2 spills · 2.8 hours · Monitored 99.5% of 2025
LLANIDLOES - SHORTBRIDGE STREET, LONGBRIDGE SOUTH & LONGBRIDGE NORTH (CSO)
Receiving water not named in the return · 1.2 km from the centre of SY18
18 spills · 6.3 hours · Monitored 99.3% of 2025
LLANIDLOES - SHORTBRIDGE STREET, LONGBRIDGE SOUTH & LONGBRIDGE NORTH (CSO)
Receiving water not named in the return · 1.3 km from the centre of SY18
7 spills · 36.2 hours · Monitored 100% of 2025
Llanidloes – Berth Llwyd Farm (CSO)
Receiving water not named in the return · 2.6 km from the centre of SY18
18 spills · 54.2 hours · Monitored 100% of 2025
Llanidloes Wastewater Treatment Works
Receiving water not named in the return · 3.8 km from the centre of SY18
21 spills · 245.4 hours · Monitored 99.5% 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
66% built before 1973
66% of homes here were built before 1973 — estimate, not a test.
Homes in the parts of SY18 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: 64–66%. England and Wales: 61% (2026).
Older homes are more likely to have lead pipes. Only a test tells you whether yours does.
SY18 (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 SY18
- Is the water in SY18 hard or soft?
- Hafren Dyfrdwy: soft, 56 mg/l, 3.9 °Clark, 3.1 °dH, 5.6 °fH (Newtown (supply zone), 1 August 2025 to 31 July 2026). Typical value. Hafren Dyfrdwy: We do not have a verified hardness figure for this area. Ask your water company for its water quality report. Dŵr Cymru Welsh 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 SY18?
- Hafren Dyfrdwy: at least 12 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. Wales overall: 99.97% of tests met standards.
- Could homes in SY18 have lead pipes?
- 66% of homes here were built before 1973 — estimate, not a test. Homes in the parts of SY18 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: 64–66%. 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 SY18 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
- Hafren Dyfrdwy contact page ↗ · 13 October 2026 · read 13 October 2026
- DWI wales 2025, Annex B ↗ · 2025 · read 13 October 2026
- DWI wales 2025, national compliance ↗ · 2025 · read 13 October 2026
- Hafren Dyfrdwy ↗ · 1 August 2025 to 31 July 2026 · read 1 October 2026
- The Rivers Trust (EA/NRW EDM 2025) ↗ · 2025 · read 13 October 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
- Hafren Dyfrdwy ↗ · 11 October 2026 · read 11 October 2026
Hafren Dyfrdwy contact page, Hafren Dyfrdwy, Hafren Dyfrdwy: 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