Colwell Brook at A415, Witney
EA name: COLWELL BROOK AT A415, WITNEY
Environment Agency sampling point TH-PWRR0002 · Freshwater - rivers · listed as open (“open” does not mean it is sampled now)
These are samples taken on a date, not live readings of the river. Results reach the Environment Agency's archive days to months after the sample is taken, so the newest here may be weeks or months old. FloodRadar does not grade them.
Where and when
- Last sampled
- 24 Aug 2026, 09:4638 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 35 since 9 Oct 2023 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 435140, 208575As published, to the nearest 1 m. Open in a map
- River, by its own name
- Colwell Brook
- River, by the map
- Colwell BrookPlaced on the river its name gives, 3 m from the line.
- Next gauge downstream
- Newbridge GS On the River Windrush · 10 km along the river
- Why it was sampled
- Monitoring (national agency policy) (29 samples)
Environmental monitoring statutory (EU directives) (6 samples)
Main measurements, river water
pH
code 0061
7.28
Sampled 24 Aug 2026, 38 days ago · 35 results banked
Every result (35)
| Sampled | Result as published | Reads as |
|---|---|---|
| 24 Aug 2026, 09:46 | 7.28 | 7.28 |
| 28 Jul 2026, 13:31 | 7.39 | 7.39 |
| 22 Jun 2026, 12:27 | 7.29 | 7.29 |
| 15 May 2026, 11:24 | 7.34 | 7.34 |
| 10 Apr 2026, 10:29 | 7.45 | 7.45 |
| 4 Mar 2026, 11:17 | 7.32 | 7.32 |
| 18 Feb 2026, 10:52 | 7.42 | 7.42 |
| 16 Jan 2026, 11:21 | 7.5 | 7.5 |
| 5 Dec 2025, 10:58 | 7.45 | 7.45 |
| 12 Nov 2025, 12:20 | 7.27 | 7.27 |
| 28 Oct 2025, 12:05 | 7.41 | 7.41 |
| 25 Sep 2025, 11:26 | 7.31 | 7.31 |
| 27 Aug 2025, 12:36 | 7.3 | 7.3 |
| 28 Jul 2025, 11:39 | 7.22 | 7.22 |
| 27 Jun 2025, 11:27 | 7.42 | 7.42 |
| 22 May 2025, 09:08 | 7.48 | 7.48 |
| 24 Apr 2025, 10:28 | 7.38 | 7.38 |
| 18 Mar 2025, 15:36 | 7.42 | 7.42 |
| 18 Feb 2025, 14:15 | 7.42 | 7.42 |
| 24 Jan 2025, 14:45 | 7.34 | 7.34 |
| 9 Dec 2024, 10:10 | 7.68 | 7.68 |
| 11 Nov 2024, 12:37 | 7.47 | 7.47 |
| 11 Oct 2024, 14:38 | 7.44 | 7.44 |
| 25 Sep 2024, 11:00 | 7.42 | 7.42 |
| 12 Aug 2024, 12:56 | 7.32 | 7.32 |
| 17 Jul 2024, 09:50 | 7.38 | 7.38 |
| 27 Jun 2024, 10:15 | 7.48 | 7.48 |
| 8 May 2024, 14:56 | 7.47 | 7.47 |
| 4 Apr 2024, 11:12 | 7.41 | 7.41 |
| 5 Mar 2024, 10:07 | 7.39 | 7.39 |
| 1 Feb 2024, 14:56 | 7.45 | 7.45 |
| 16 Jan 2024, 13:02 | 7.38 | 7.38 |
| 6 Dec 2023, 12:40 | 7.61 | 7.61 |
| 10 Nov 2023, 08:53 | 7.42 | 7.42 |
| 9 Oct 2023, 10:19 | 7.35 | 7.35 |
Everything measured here
6 determinands, each kept by its code, unit and sample material: results in different units or on different materials are never mixed. A “below” result is under the laboratory's detection limit, not zero.
Show all 6 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| pH 0061 | River water | 35 | Oct 2023 – Aug 2026 | 7.28 24 Aug 2026 |
| Cadmium, Dissolved 0106 | River water | 35 | Oct 2023 – Aug 2026 | below 0.01 µg/l 24 Aug 2026 |
| Calcium, Dissolved 0239 | River water | 35 | Oct 2023 – Aug 2026 | 94 mg/l 24 Aug 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 35 | Oct 2023 – Aug 2026 | 6.1 mg/l 24 Aug 2026 |
| Iron, Dissolved 6460 | River water | 12 | Oct 2023 – Jul 2026 | 40 µg/l 28 Jul 2026 |
| Magnesium, Dissolved 0235 | River water | 35 | Oct 2023 – Aug 2026 | 7.4 mg/l 24 Aug 2026 |
FloodRadar does not grade these results: there is no overall score, and official river classifications are a separate dataset. A sample taken downstream of an overflow does not by itself show where anything in it came from. River connections and distances are traced on OS Open Rivers (edition 2026-04), which leaves out many small channels.
Water samples: Environment Agency Water Quality Archive, © Environment Agency and/or database right 2026, Open Government Licence v3.0.
Contains OS data © Crown copyright and database rights 2026.