Cambridge Water: water hardness, quality and supply area
Cambridge Water: at least 1 test 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.
Water supplier in England
Hosepipe ban
Hosepipe ban in force
Cambridge Water (Environment Agency, 11 October 2026). Checked 11 October 2026 at 02:34
Details
Cambridge Water (Environment Agency, 11 October 2026). Checked 11 October 2026 at 02:34
Cambridge Water hosepipe ban
Contact Cambridge Water
We can't tell your sewerage company from official data for this area. It's named on your water bill.
Drinking-water test record
Cambridge Water
Cambridge Water, company-wide
- Regulator
- DWI
- Report year
- 2025
- Failed tests
- Not shown
- Tests
- 29,664
The regulator's published total and its company rows disagree, so we don't show a count.
| Parameter | Failed tests |
|---|---|
| Total coliforms (confirmed) | 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 Cambridge Water's water?
From the supply-zone figures the company publishes. Your own zone can differ: enter your postcode above for its figure.
| Supply area | Hardness | mg/l CaCO₃ | °Clark | °dH | °fH | What the figure covers |
|---|---|---|---|---|---|---|
| Cambridge Water | Hardness:Very hard | mg/l CaCO₃:304–352 mg/l | °Clark:21.3–24.7 °Clark | °dH:17.0–19.7 °dH | °fH:30.4–35.2 °fH | Covers:Range across the 7 supply zones we hold a figure for, 86% of its postcodes. Most common band: very hard (86% of its postcodes). Heydon (supply zone) · 2025 Source: Cambridge Water — dated 2025, read 20 September 2026 Odsey (supply zone) · 2025 Source: Cambridge Water — dated 2025, read 20 September 2026 |
Sources and method
- Cambridge 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
- Environment Agency ↗ · 11 October 2026 · read 11 October 2026
- Drinking Water Inspectorate — Water Hardness / Hard Water ("Water Hardness (mg/l CaCO3)") ↗ · Water Hardness / Hard Water · read 20 September 2026
- Cambridge Water ↗ · 2025 · read 20 September 2026
- Cambridge Water ↗ · 2025 · read 20 September 2026
- ONS Postcode Directory (ONSPD) ↗ · May 2026 · read 19 September 2026
Cambridge Water contact page, Cambridge Water, Cambridge Water: Database right, used under the publisher's terms.
Contains public sector information licensed under the Open Government Licence v3.0Contains OS data © Crown copyright and database right 2026Contains Royal Mail data © Royal Mail copyright and database right 2026Source: Office for National Statistics licensed under the Open Government Licence v.3.0
Data generation uk-2026-10-16-derive6