NG33 tap water: what's in it?
Anglian Water group (figures include Anglian Water): at least 25 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.
NG33 tap water quality report · 2026
Hardness
At least hard
Grantham Central PWSZ (supply zone) · January 2025 to December 2025
Details
Grantham Central PWSZ (supply zone) · January 2025 to December 2025
Hosepipe ban
Hosepipe ban in force
Anglian Water (Environment Agency, 11 October 2026). Checked 11 October 2026 at 02:34
Details
Anglian Water (Environment Agency, 11 October 2026). Checked 11 October 2026 at 02:34
Storm overflows
8 overflows within 10 km of NG33 centre
85 spills in 2025
Details
85 spills in 2025
Lead pipes
59% built before 1973
Estimate, not a test. Homes in the parts of NG33 we can match to council-tax records (100% of its postcodes) whose build period is known; 10% have no recorded build period. Allowing for suppressed counts: 57–59%. England and Wales: 61% (2026).
Details
Estimate, not a test. Homes in the parts of NG33 we can match to council-tax records (100% of its postcodes) whose build period is known; 10% have no recorded build period. Allowing for suppressed counts: 57–59%. England and Wales: 61% (2026).
Who supplies water in NG33
Part of Anglian Water
Supplies 451 of 473 postcodes (95%)
We can't confirm your sewerage company from official data for this area.
Also supplied here: Severn Trent Water (22 of 473 postcodes (5%))
Drinking-water test record
Anglian Water: 451 of 473 postcodes
Anglian Water
Anglian Water group, includes Anglian Water
- Regulator
- DWI
- Report year
- 2025
- Failed tests
- Not shown
- Tests
- 384,536
The regulator's published total and its company rows disagree, so we don't show a count.
| Parameter | Failed tests |
|---|---|
| Copper | Failed tests: 1 |
| E. coli (confirmed) | Failed tests: 1 |
| Iron | Failed tests: 6 |
| Lead | Failed tests: 2 |
| Nickel | Failed tests: 3 |
| Total coliforms (confirmed) | Failed tests: 10 |
| Turbidity – indicator | Failed tests: 2 |
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
Severn Trent Water: 22 of 473 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 NG33?
Across NG33's supply zones, hardness ranges from 249 mg/l (hard) to 316 mg/l (very hard). Those 2 zones cover 4% of its postcodes.
5 identified supply zones in NG33
Grantham Central PWSZ · Anglian Water (281 of 473 postcodes)
at least 273 mg/l · at least 19.2 °Clark · at least 15.3 °dH · at least 27.3 °fH
Zone average. At least 273 mg/l (hard or harder); total hardness is higher.
Grantham Central PWSZ (supply zone) · January 2025 to December 2025
Source: Anglian Water — dated January 2025 to December 2025, read 28 September 2026
Bourne PWSZ · Anglian Water (134 of 473 postcodes)
at least 370 mg/l · at least 25.9 °Clark · at least 20.7 °dH · at least 37.0 °fH
Zone average. At least 370 mg/l (very hard or harder); total hardness is higher.
Bourne PWSZ (supply zone) · January 2025 to December 2025
Source: Anglian Water — dated January 2025 to December 2025, read 28 September 2026
Barrowby PWSZ · Anglian Water (35 of 473 postcodes)
at least 223 mg/l · at least 15.6 °Clark · at least 12.5 °dH · at least 22.3 °fH
Zone average. At least 223 mg/l (hard or harder); total hardness is higher.
Barrowby PWSZ (supply zone) · January 2025 to December 2025
Source: Anglian Water — dated January 2025 to December 2025, read 28 September 2026
Sewstern · Severn Trent Water (17 of 473 postcodes)
316 mg/l · 22.2 °Clark · 17.7 °dH · 31.6 °fH
Typical value.
Sewstern (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
East Leicester Rural · Severn Trent Water (3 of 473 postcodes)
249 mg/l · 17.5 °Clark · 14.0 °dH · 24.9 °fH
Typical value.
East Leicester Rural (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
3 postcodes without an identified supply zone
Severn Trent Water (2 of 473 postcodes)
We do not have a verified hardness figure for this area. Ask your water company for its water quality report.
Anglian Water (1 of 473 postcodes)
We do not have a verified hardness figure for this area. Ask your water company for its water quality report.
Storm overflows nearby
8 overflows within 10 km of NG33 centre · 85 spills in 2025
NG33 (district) · 2025
Source: Environment Agency EDM annual return 2025 — dated 20 August 2026, read 13 October 2026
Overflows here are run by Anglian Water.
5 of these were monitored for only part of 2025.
Nearest 5 shown
COLSTERWORTH STW
Into RIVER WITHAM · 3.1 km from the centre of NG33
20 spills · 16 hours · Monitored 97% of 2025
NORTH WITHAM TPS
Into THE RIVER WITHAM · 4.8 km from the centre of NG33
3 spills · 15.3 hours · Monitored 100% of 2025
SSO AT SWINSTEAD
Into Trib East Glen · 6.9 km from the centre of NG33
1 spill · 5.3 hours · Monitored 98.7% of 2025
CREETON PUMPING STATION
Into TRIBUTARY OF THE WEST GLEN RIR · 7.6 km from the centre of NG33
0 spills · 0 hours · Monitored 100% of 2025
LITTLE BYTHAM STW
Into tributary West Glen River · 8.6 km from the centre of NG33
48 spills · 110.4 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
59% built before 1973
59% of homes here were built before 1973 — estimate, not a test.
Homes in the parts of NG33 we can match to council-tax records (100% of its postcodes) whose build period is known; 10% have no recorded build period. Allowing for suppressed counts: 57–59%. England and Wales: 61% (2026).
Older homes are more likely to have lead pipes. Only a test tells you whether yours does.
NG33 (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 NG33
- Is the water in NG33 hard or soft?
- Anglian Water: at least hard, at least 273 mg/l, at least 19.2 °Clark, at least 15.3 °dH, at least 27.3 °fH (Grantham Central PWSZ (supply zone), January 2025 to December 2025). Zone average. At least 273 mg/l (hard or harder); total hardness is higher. Anglian Water: at least very hard, at least 370 mg/l, at least 25.9 °Clark, at least 20.7 °dH, at least 37.0 °fH (Bourne PWSZ (supply zone), January 2025 to December 2025). Zone average. At least 370 mg/l (very hard or harder); total hardness is higher. Anglian Water: at least hard, at least 223 mg/l, at least 15.6 °Clark, at least 12.5 °dH, at least 22.3 °fH (Barrowby PWSZ (supply zone), January 2025 to December 2025). Zone average. At least 223 mg/l (hard or harder); total hardness is higher. Severn Trent Water: very hard, 316 mg/l, 22.2 °Clark, 17.7 °dH, 31.6 °fH (Sewstern (supply zone), 1 August 2025 to 31 July 2026). Typical value. Severn Trent Water: hard, 249 mg/l, 17.5 °Clark, 14.0 °dH, 24.9 °fH (East Leicester Rural (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. Anglian 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 NG33?
- Anglian Water group (figures include Anglian Water): at least 25 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 NG33 have lead pipes?
- 59% of homes here were built before 1973 — estimate, not a test. Homes in the parts of NG33 we can match to council-tax records (100% of its postcodes) whose build period is known; 10% have no recorded build period. Allowing for suppressed counts: 57–59%. 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 NG33 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
- Anglian 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
- Anglian Water ↗ · January 2025 to December 2025 · read 28 September 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
- Environment Agency ↗ · 11 October 2026 · read 11 October 2026
Anglian Water contact page, 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 v3.0All content is available under the Open Government Licence v3.0, except where otherwise stated © Crown copyright
Data generation uk-2026-10-16-derive6