Bourne (South) at Mimbridge, Chobham
EA name: BOURNE ( SOUTH ) AT MIMBRIDGE, CHOBHAM
Environment Agency sampling point TH-PBNR0004 · 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
- 8 Jul 2026, 16:053 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 32 since 18 Oct 2023 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Environmental monitoring statutory (EU directives)
- Where
- National Grid 499160, 160610As published, to the nearest 10 m. Open in a map
- River, by its own name
- Bourne
- River, by the map
- The BournePlaced on the river its name gives, 0 m from the line.
- Next gauge downstream
- Addlestone On the Addlestone Bourne · 11 km along the river
- Nearest gauge upstream
- Grants Bridge On the Addlestone Bourne · 3.3 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (32 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
57.3%
Sampled 8 Jul 2026, 3 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Jul 2026, 16:05 | 57.3 | 57.3% |
| 10 Jun 2026, 09:45 | 61.1 | 61.1% |
| 11 May 2026, 11:06 | 72 | 72% |
| 9 Apr 2026, 13:20 | 86.3 | 86.3% |
| 6 Mar 2026, 11:43 | 76 | 76% |
| 12 Feb 2026, 11:07 | 74.2 | 74.2% |
| 29 Jan 2026, 13:59 | 76.5 | 76.5% |
| 5 Dec 2025, 10:43 | 71.4 | 71.4% |
| 12 Nov 2025, 12:05 | 63.5 | 63.5% |
| 15 Oct 2025, 12:03 | 66.4 | 66.4% |
| 24 Sep 2025, 12:46 | 65 | 65% |
| 29 Aug 2025, 11:04 | 69.3 | 69.3% |
| 22 Jul 2025, 10:09 | 62 | 62% |
| 2 Jun 2025, 11:16 | 55.2 | 55.2% |
| 14 May 2025, 12:01 | 63 | 63% |
| 9 Apr 2025, 13:08 | 78.5 | 78.5% |
| 10 Mar 2025, 10:39 | 67.7 | 67.7% |
| 6 Feb 2025, 11:32 | 79.6 | 79.6% |
| 21 Jan 2025, 11:31 | 78.5 | 78.5% |
| 5 Dec 2024, 11:54 | 75.4 | 75.4% |
| 7 Nov 2024, 12:13 | 59.4 | 59.4% |
| 4 Oct 2024, 12:05 | 77.4 | 77.4% |
| 13 Sep 2024, 10:05 | 72.1 | 72.1% |
| 30 Aug 2024, 10:21 | 64.6 | 64.6% |
| 5 Jul 2024, 12:47 | 56.5 | 56.5% |
| 20 Jun 2024, 12:07 | 67.5 | 67.5% |
| 7 Mar 2024, 10:31 | 83.7 | 83.7% |
| 12 Feb 2024, 11:49 | 79 | 79% |
| 24 Jan 2024, 09:28 | 74.5 | 74.5% |
| 6 Dec 2023, 12:32 | 74.1 | 74.1% |
| 7 Nov 2023, 10:29 | 59 | 59% |
| 18 Oct 2023, 10:29 | 60 | 60% |
Dissolved oxygen
as O2 · code 9924 · mg/l
5.01 mg/l
Sampled 8 Jul 2026, 3 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Jul 2026, 16:05 | 5.01 | 5.01 mg/l |
| 10 Jun 2026, 09:45 | 6.34 | 6.34 mg/l |
| 11 May 2026, 11:06 | 7.89 | 7.89 mg/l |
| 9 Apr 2026, 13:20 | 8.91 | 8.91 mg/l |
| 6 Mar 2026, 11:43 | 8.67 | 8.67 mg/l |
| 12 Feb 2026, 11:07 | 8.6 | 8.6 mg/l |
| 29 Jan 2026, 13:59 | 9.46 | 9.46 mg/l |
| 5 Dec 2025, 10:43 | 8.9 | 8.9 mg/l |
| 12 Nov 2025, 12:05 | 6.69 | 6.69 mg/l |
| 15 Oct 2025, 12:03 | 7.03 | 7.03 mg/l |
| 24 Sep 2025, 12:46 | 6.83 | 6.83 mg/l |
| 29 Aug 2025, 11:04 | 6.68 | 6.68 mg/l |
| 22 Jul 2025, 10:09 | 5.88 | 5.88 mg/l |
| 2 Jun 2025, 11:16 | 5.49 | 5.49 mg/l |
| 14 May 2025, 12:01 | 6.45 | 6.45 mg/l |
| 9 Apr 2025, 13:08 | 8.72 | 8.72 mg/l |
| 10 Mar 2025, 10:39 | 7.74 | 7.74 mg/l |
| 6 Feb 2025, 11:32 | 10 | 10 mg/l |
| 21 Jan 2025, 11:31 | 9.94 | 9.94 mg/l |
| 5 Dec 2024, 11:54 | 8.49 | 8.49 mg/l |
| 7 Nov 2024, 12:13 | 6.45 | 6.45 mg/l |
| 4 Oct 2024, 12:05 | 8.34 | 8.34 mg/l |
| 13 Sep 2024, 10:05 | 8.03 | 8.03 mg/l |
| 30 Aug 2024, 10:21 | 6.47 | 6.47 mg/l |
| 5 Jul 2024, 12:47 | 5.5 | 5.5 mg/l |
| 20 Jun 2024, 12:07 | 6.76 | 6.76 mg/l |
| 7 Mar 2024, 10:31 | 10 | 10 mg/l |
| 12 Feb 2024, 11:49 | 9.32 | 9.32 mg/l |
| 24 Jan 2024, 09:28 | 8.79 | 8.79 mg/l |
| 6 Dec 2023, 12:32 | 9.05 | 9.05 mg/l |
| 7 Nov 2023, 10:29 | 6.69 | 6.69 mg/l |
| 18 Oct 2023, 10:29 | 6.45 | 6.45 mg/l |
Water temperature
code 0076 · °C
21.9 °C
Sampled 8 Jul 2026, 3 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Jul 2026, 16:05 | 21.9 | 21.9 °C |
| 10 Jun 2026, 09:45 | 13.6 | 13.6 °C |
| 11 May 2026, 11:06 | 11.2 | 11.2 °C |
| 9 Apr 2026, 13:20 | 13.8 | 13.8 °C |
| 6 Mar 2026, 11:43 | 9.5 | 9.5 °C |
| 12 Feb 2026, 11:07 | 8.8 | 8.8 °C |
| 29 Jan 2026, 13:59 | 6.2 | 6.2 °C |
| 5 Dec 2025, 10:43 | 5.9 | 5.9 °C |
| 12 Nov 2025, 12:05 | 12.9 | 12.9 °C |
| 15 Oct 2025, 12:03 | 12.7 | 12.7 °C |
| 24 Sep 2025, 12:46 | 13 | 13 °C |
| 29 Aug 2025, 11:04 | 17 | 17 °C |
| 22 Jul 2025, 10:09 | 17.8 | 17.8 °C |
| 2 Jun 2025, 11:16 | 15.5 | 15.5 °C |
| 14 May 2025, 12:01 | 14.2 | 14.2 °C |
| 9 Apr 2025, 13:08 | 10.6 | 10.6 °C |
| 10 Mar 2025, 10:39 | 9.4 | 9.4 °C |
| 6 Feb 2025, 11:32 | 5.4 | 5.4 °C |
| 21 Jan 2025, 11:31 | 5.3 | 5.3 °C |
| 5 Dec 2024, 11:54 | 10 | 10 °C |
| 7 Nov 2024, 12:13 | 11.6 | 11.6 °C |
| 4 Oct 2024, 12:05 | 11.9 | 11.9 °C |
| 13 Sep 2024, 10:05 | 10.5 | 10.5 °C |
| 30 Aug 2024, 10:21 | 15.2 | 15.2 °C |
| 5 Jul 2024, 12:47 | 16.5 | 16.5 °C |
| 20 Jun 2024, 12:07 | 15.2 | 15.2 °C |
| 7 Mar 2024, 10:31 | 7.6 | 7.6 °C |
| 12 Feb 2024, 11:49 | 8.1 | 8.1 °C |
| 24 Jan 2024, 09:28 | 8.1 | 8.1 °C |
| 6 Dec 2023, 12:32 | 6.7 | 6.7 °C |
| 7 Nov 2023, 10:29 | 9.7 | 9.7 °C |
| 18 Oct 2023, 10:29 | 12 | 12 °C |
pH
code 0061
7.13
Sampled 8 Jul 2026, 3 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Jul 2026, 16:05 | 7.13 | 7.13 |
| 10 Jun 2026, 09:45 | 6.99 | 6.99 |
| 11 May 2026, 11:06 | 7.07 | 7.07 |
| 9 Apr 2026, 13:20 | 7.2 | 7.2 |
| 6 Mar 2026, 11:43 | 7.14 | 7.14 |
| 12 Feb 2026, 11:07 | 7.1 | 7.1 |
| 29 Jan 2026, 13:59 | 7 | 7 |
| 5 Dec 2025, 10:43 | 7.25 | 7.25 |
| 12 Nov 2025, 12:05 | 7.02 | 7.02 |
| 15 Oct 2025, 12:03 | 7.09 | 7.09 |
| 24 Sep 2025, 12:46 | 7.17 | 7.17 |
| 29 Aug 2025, 11:04 | 7.22 | 7.22 |
| 22 Jul 2025, 10:09 | 7.21 | 7.21 |
| 2 Jun 2025, 11:16 | 7.16 | 7.16 |
| 14 May 2025, 12:01 | 7.1 | 7.1 |
| 9 Apr 2025, 13:08 | 7.38 | 7.38 |
| 10 Mar 2025, 10:39 | 7.17 | 7.17 |
| 6 Feb 2025, 11:32 | 7.14 | 7.14 |
| 21 Jan 2025, 11:31 | 7.13 | 7.13 |
| 5 Dec 2024, 11:54 | 7.09 | 7.09 |
| 7 Nov 2024, 12:13 | 7.11 | 7.11 |
| 4 Oct 2024, 12:05 | 7.09 | 7.09 |
| 13 Sep 2024, 10:05 | 7.17 | 7.17 |
| 30 Aug 2024, 10:21 | 7.3 | 7.3 |
| 5 Jul 2024, 12:47 | 7.44 | 7.44 |
| 20 Jun 2024, 12:07 | 7.27 | 7.27 |
| 7 Mar 2024, 10:31 | 7.17 | 7.17 |
| 12 Feb 2024, 11:49 | 7.25 | 7.25 |
| 24 Jan 2024, 09:28 | 7.23 | 7.23 |
| 6 Dec 2023, 12:32 | 7.15 | 7.15 |
| 7 Nov 2023, 10:29 | 6.97 | 6.97 |
| 18 Oct 2023, 10:29 | 7.3 | 7.3 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.12 mg/l
Sampled 8 Jul 2026, 3 months ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Jul 2026, 16:05 | 0.12 | 0.12 mg/l |
| 10 Jun 2026, 09:45 | 0.35 | 0.35 mg/l |
| 11 May 2026, 11:06 | 0.13 | 0.13 mg/l |
| 9 Apr 2026, 13:20 | 0.1 | 0.1 mg/l |
| 6 Mar 2026, 11:43 | 0.2 | 0.2 mg/l |
| 12 Feb 2026, 11:07 | 0.2 | 0.2 mg/l |
| 29 Jan 2026, 13:59 | 0.32 | 0.32 mg/l |
| 5 Dec 2025, 10:43 | 0.25 | 0.25 mg/l |
| 12 Nov 2025, 12:05 | 0.068 | 0.068 mg/l |
| 15 Oct 2025, 12:03 | 0.19 | 0.19 mg/l |
| 24 Sep 2025, 12:46 | 0.31 | 0.31 mg/l |
| 29 Aug 2025, 11:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Jul 2025, 10:09 | 0.069 | 0.069 mg/l |
| 2 Jun 2025, 11:16 | 0.52 | 0.52 mg/l |
| 14 May 2025, 12:01 | 0.2 | 0.2 mg/l |
| 9 Apr 2025, 13:08 | 0.14 | 0.14 mg/l |
| 10 Mar 2025, 10:39 | 1.2 | 1.2 mg/l |
| 6 Feb 2025, 11:32 | 0.65 | 0.65 mg/l |
| 21 Jan 2025, 11:31 | 0.7 | 0.7 mg/l |
| 7 Nov 2024, 12:13 | 0.36 | 0.36 mg/l |
| 4 Oct 2024, 12:05 | 0.25 | 0.25 mg/l |
| 13 Sep 2024, 10:05 | 0.055 | 0.055 mg/l |
| 30 Aug 2024, 10:21 | 0.076 | 0.076 mg/l |
| 5 Jul 2024, 12:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Jun 2024, 12:07 | 0.43 | 0.43 mg/l |
| 7 Mar 2024, 10:31 | 0.34 | 0.34 mg/l |
| 12 Feb 2024, 11:49 | 0.21 | 0.21 mg/l |
| 6 Dec 2023, 12:32 | 0.34 | 0.34 mg/l |
| 7 Nov 2023, 10:29 | 0.41 | 0.41 mg/l |
| 18 Oct 2023, 10:29 | 0.25 | 0.25 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
14.8 mg/l
Sampled 8 Jul 2026, 3 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Jul 2026, 16:05 | 14.8 | 14.8 mg/l |
| 10 Jun 2026, 09:45 | 7.04 | 7.04 mg/l |
| 11 May 2026, 11:06 | 9.88 | 9.88 mg/l |
| 9 Apr 2026, 13:20 | 4.37 | 4.37 mg/l |
| 6 Mar 2026, 11:43 | 3.24 | 3.24 mg/l |
| 12 Feb 2026, 11:07 | 1.69 | 1.69 mg/l |
| 29 Jan 2026, 13:59 | 1.87 | 1.87 mg/l |
| 5 Dec 2025, 10:43 | 2.62 | 2.62 mg/l |
| 12 Nov 2025, 12:05 | 4.04 | 4.04 mg/l |
| 15 Oct 2025, 12:03 | 10.8 | 10.8 mg/l |
| 24 Sep 2025, 12:46 | 11.8 | 11.8 mg/l |
| 29 Aug 2025, 11:04 | 3.87 | 3.87 mg/l |
| 22 Jul 2025, 10:09 | 10.9 | 10.9 mg/l |
| 2 Jun 2025, 11:16 | 9.56 | 9.56 mg/l |
| 14 May 2025, 12:01 | 6.36 | 6.36 mg/l |
| 9 Apr 2025, 13:08 | 4.33 | 4.33 mg/l |
| 10 Mar 2025, 10:39 | 1.33 | 1.33 mg/l |
| 6 Feb 2025, 11:32 | 1.66 | 1.66 mg/l |
| 21 Jan 2025, 11:31 | 1.95 | 1.95 mg/l |
| 7 Nov 2024, 12:13 | 1.8 | 1.8 mg/l |
| 4 Oct 2024, 12:05 | 2.22 | 2.22 mg/l |
| 13 Sep 2024, 10:05 | 4.94 | 4.94 mg/l |
| 30 Aug 2024, 10:21 | 7.24 | 7.24 mg/l |
| 5 Jul 2024, 12:47 | 2.67 | 2.67 mg/l |
| 20 Jun 2024, 12:07 | 3.1 | 3.1 mg/l |
| 7 Mar 2024, 10:31 | 2.24 | 2.24 mg/l |
| 12 Feb 2024, 11:49 | 1.87 | 1.87 mg/l |
| 24 Jan 2024, 09:28 | 1.95 | 1.95 mg/l |
| 6 Dec 2023, 12:32 | 1.26 | 1.26 mg/l |
| 7 Nov 2023, 10:29 | 1.62 | 1.62 mg/l |
| 18 Oct 2023, 10:29 | 4.26 | 4.26 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.072 mg/l
Sampled 8 Jul 2026, 3 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Jul 2026, 16:05 | 0.072 | 0.072 mg/l |
| 10 Jun 2026, 09:45 | 0.094 | 0.094 mg/l |
| 11 May 2026, 11:06 | 0.087 | 0.087 mg/l |
| 9 Apr 2026, 13:20 | 0.099 | 0.099 mg/l |
| 6 Mar 2026, 11:43 | 0.13 | 0.13 mg/l |
| 12 Feb 2026, 11:07 | 0.11 | 0.11 mg/l |
| 29 Jan 2026, 13:59 | 0.091 | 0.091 mg/l |
| 5 Dec 2025, 10:43 | 0.076 | 0.076 mg/l |
| 12 Nov 2025, 12:05 | 0.099 | 0.099 mg/l |
| 15 Oct 2025, 12:03 | 0.19 | 0.19 mg/l |
| 24 Sep 2025, 12:46 | 0.12 | 0.12 mg/l |
| 29 Aug 2025, 11:04 | 0.13 | 0.13 mg/l |
| 22 Jul 2025, 10:09 | 0.24 | 0.24 mg/l |
| 2 Jun 2025, 11:16 | 0.17 | 0.17 mg/l |
| 14 May 2025, 12:01 | 0.16 | 0.16 mg/l |
| 9 Apr 2025, 13:08 | 0.14 | 0.14 mg/l |
| 10 Mar 2025, 10:39 | 0.12 | 0.12 mg/l |
| 6 Feb 2025, 11:32 | 0.11 | 0.11 mg/l |
| 21 Jan 2025, 11:31 | 0.11 | 0.11 mg/l |
| 7 Nov 2024, 12:13 | 0.19 | 0.19 mg/l |
| 4 Oct 2024, 12:05 | 0.12 | 0.12 mg/l |
| 13 Sep 2024, 10:05 | 0.17 | 0.17 mg/l |
| 30 Aug 2024, 10:21 | 0.17 | 0.17 mg/l |
| 5 Jul 2024, 12:47 | 0.15 | 0.15 mg/l |
| 20 Jun 2024, 12:07 | 0.16 | 0.16 mg/l |
| 7 Mar 2024, 10:31 | 0.17 | 0.17 mg/l |
| 12 Feb 2024, 11:49 | 0.17 | 0.17 mg/l |
| 24 Jan 2024, 09:28 | 0.13 | 0.13 mg/l |
| 6 Dec 2023, 12:32 | 0.13 | 0.13 mg/l |
| 7 Nov 2023, 10:29 | 0.13 | 0.13 mg/l |
| 18 Oct 2023, 10:29 | 0.22 | 0.22 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
827 µS/cm
Sampled 8 Jul 2026, 3 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Jul 2026, 16:05 | 827 | 827 µS/cm |
| 10 Jun 2026, 09:45 | 499 | 499 µS/cm |
| 11 May 2026, 11:06 | 598 | 598 µS/cm |
| 9 Apr 2026, 13:20 | 463 | 463 µS/cm |
| 6 Mar 2026, 11:43 | 474 | 474 µS/cm |
| 12 Feb 2026, 11:07 | 337 | 337 µS/cm |
| 29 Jan 2026, 13:59 | 355 | 355 µS/cm |
| 5 Dec 2025, 10:43 | 400 | 400 µS/cm |
| 12 Nov 2025, 12:05 | 413 | 413 µS/cm |
| 15 Oct 2025, 12:03 | 613 | 613 µS/cm |
| 24 Sep 2025, 12:46 | 662 | 662 µS/cm |
| 29 Aug 2025, 11:04 | 357 | 357 µS/cm |
| 22 Jul 2025, 10:09 | 629 | 629 µS/cm |
| 2 Jun 2025, 11:16 | 631 | 631 µS/cm |
| 14 May 2025, 12:01 | 480 | 480 µS/cm |
| 9 Apr 2025, 13:08 | 464 | 464 µS/cm |
| 10 Mar 2025, 10:39 | 442 | 442 µS/cm |
| 6 Feb 2025, 11:32 | 421 | 421 µS/cm |
| 21 Jan 2025, 11:31 | 427 | 427 µS/cm |
| 5 Dec 2024, 11:54 | 412 | 412 µS/cm |
| 7 Nov 2024, 12:13 | 425 | 425 µS/cm |
| 4 Oct 2024, 12:05 | 392 | 392 µS/cm |
| 13 Sep 2024, 10:05 | 517 | 517 µS/cm |
| 30 Aug 2024, 10:21 | 617 | 617 µS/cm |
| 5 Jul 2024, 12:47 | 484 | 484 µS/cm |
| 20 Jun 2024, 12:07 | 555 | 555 µS/cm |
| 7 Mar 2024, 10:31 | 415 | 415 µS/cm |
| 12 Feb 2024, 11:49 | 377 | 377 µS/cm |
| 24 Jan 2024, 09:28 | 396 | 396 µS/cm |
| 6 Dec 2023, 12:32 | 365 | 365 µS/cm |
| 7 Nov 2023, 10:29 | 401 | 401 µS/cm |
| 18 Oct 2023, 10:29 | 496 | 496 µS/cm |
Everything measured here
13 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 13 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 32 | Oct 2023 – Jul 2026 | 57.3% 8 Jul 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 32 | Oct 2023 – Jul 2026 | 5.01 mg/l 8 Jul 2026 |
| Temperature of Water 0076 | River water | 32 | Oct 2023 – Jul 2026 | 21.9 °C 8 Jul 2026 |
| pH 0061 | River water | 32 | Oct 2023 – Jul 2026 | 7.13 8 Jul 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 30 | Oct 2023 – Jul 2026 | 0.12 mg/l 8 Jul 2026 |
| Nitrate as N 0117 | River water | 31 | Oct 2023 – Jul 2026 | 14.8 mg/l 8 Jul 2026 |
| Orthophosphate, reactive as P 0180 | River water | 31 | Oct 2023 – Jul 2026 | 0.072 mg/l 8 Jul 2026 |
| Conductivity at 25 C 0077 | River water | 32 | Oct 2023 – Jul 2026 | 827 µS/cm 8 Jul 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 31 | Oct 2023 – Jul 2026 | 68 mg/l 8 Jul 2026 |
| Ammonia un-ionised as N 0119 | River water | 30 | Oct 2023 – Jul 2026 | 0.00073 mg/l 8 Jul 2026 |
| BOD : 5 Day ATU 0085 | River water | 27 | Oct 2023 – Mar 2026 | 1.5 mg/l 6 Mar 2026 |
| Nitrite as N 0118 | River water | 31 | Oct 2023 – Jul 2026 | 0.17 mg/l 8 Jul 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 31 | Oct 2023 – Jul 2026 | 15 mg/l 8 Jul 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.