Polver Drain upstream of Pumping Station
EA name: POLVER DRN. US PUMPING STATION
Environment Agency sampling point AN-56M35 · 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
- 2 Sep 2026, 11:3629 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 31 since 16 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 560887, 312684As published, to the nearest 1 m. Open in a map
- River, by its own name
- Polver Drn
- River, by the map
- Not placedIts name gives Polver Drn; the only line close by, 1 m away, is Polver Drain and is not traced into it. The river map cannot say which watercourse this is.
- Next gauge downstream
- Not known
- Why it was sampled
- Environmental monitoring statutory (EU directives) (29 samples)
Monitoring (national agency policy) (2 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
37.6%
Sampled 2 Sep 2026, 29 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 11:36 | 37.6 | 37.6% |
| 6 Aug 2026, 13:15 | 67.1 | 67.1% |
| 2 Jul 2026, 11:50 | 70.4 | 70.4% |
| 4 Jun 2026, 07:46 | 83.5 | 83.5% |
| 14 May 2026, 07:38 | 95 | 95% |
| 10 Apr 2026, 08:14 | 97.5 | 97.5% |
| 17 Mar 2026, 08:04 | 97.4 | 97.4% |
| 2 Feb 2026, 08:38 | 81.7 | 81.7% |
| 12 Jan 2026, 07:34 | 86.2 | 86.2% |
| 5 Dec 2025, 07:40 | 81.9 | 81.9% |
| 4 Nov 2025, 07:52 | 82.5 | 82.5% |
| 10 Oct 2025, 07:39 | 58.1 | 58.1% |
| 10 Apr 2025, 07:38 | 108.7 | 108.7% |
| 5 Mar 2025, 07:55 | 90.1 | 90.1% |
| 5 Feb 2025, 07:51 | 87.4 | 87.4% |
| 22 Jan 2025, 11:35 | 86.6 | 86.6% |
| 5 Dec 2024, 14:39 | 88.2 | 88.2% |
| 18 Nov 2024, 11:57 | 81.7 | 81.7% |
| 18 Oct 2024, 12:02 | 87.2 | 87.2% |
| 19 Sep 2024, 13:07 | 95.2 | 95.2% |
| 19 Aug 2024, 12:00 | 127.5 | 127.5% |
| 17 Jul 2024, 09:03 | 90.4 | 90.4% |
| 21 Jun 2024, 11:17 | 121.2 | 121.2% |
| 13 May 2024, 09:49 | 102.2 | 102.2% |
| 15 Apr 2024, 12:13 | 105.6 | 105.6% |
| 18 Mar 2024, 08:37 | 89.1 | 89.1% |
| 19 Feb 2024, 11:44 | 80.5 | 80.5% |
| 15 Jan 2024, 10:58 | 84.9 | 84.9% |
| 5 Dec 2023, 13:44 | 78.7 | 78.7% |
| 20 Nov 2023, 08:44 | 71.3 | 71.3% |
| 16 Oct 2023, 14:18 | 106.4 | 106.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
3.51 mg/l
Sampled 2 Sep 2026, 29 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 11:36 | 3.51 | 3.51 mg/l |
| 6 Aug 2026, 13:15 | 6.16 | 6.16 mg/l |
| 2 Jul 2026, 11:50 | 6.24 | 6.24 mg/l |
| 4 Jun 2026, 07:46 | 8.08 | 8.08 mg/l |
| 14 May 2026, 07:38 | 10.6 | 10.6 mg/l |
| 10 Apr 2026, 08:14 | 10.5 | 10.5 mg/l |
| 17 Mar 2026, 08:04 | 11.2 | 11.2 mg/l |
| 2 Feb 2026, 08:38 | 9.85 | 9.85 mg/l |
| 12 Jan 2026, 07:34 | 10.9 | 10.9 mg/l |
| 5 Dec 2025, 07:40 | 10.5 | 10.5 mg/l |
| 4 Nov 2025, 07:52 | 9.1 | 9.1 mg/l |
| 10 Oct 2025, 07:39 | 6.22 | 6.22 mg/l |
| 10 Apr 2025, 07:38 | 12.1 | 12.1 mg/l |
| 5 Mar 2025, 07:55 | 11.6 | 11.6 mg/l |
| 5 Feb 2025, 07:51 | 11.2 | 11.2 mg/l |
| 22 Jan 2025, 11:35 | 11.1 | 11.1 mg/l |
| 5 Dec 2024, 14:39 | 10.2 | 10.2 mg/l |
| 18 Nov 2024, 11:57 | 9.98 | 9.98 mg/l |
| 18 Oct 2024, 12:02 | 9.15 | 9.15 mg/l |
| 19 Sep 2024, 13:07 | 9.23 | 9.23 mg/l |
| 19 Aug 2024, 12:00 | 11.8 | 11.8 mg/l |
| 17 Jul 2024, 09:03 | 8.9 | 8.9 mg/l |
| 21 Jun 2024, 11:17 | 11.3 | 11.3 mg/l |
| 13 May 2024, 09:49 | 9.46 | 9.46 mg/l |
| 15 Apr 2024, 12:13 | 11.7 | 11.7 mg/l |
| 18 Mar 2024, 08:37 | 10.2 | 10.2 mg/l |
| 19 Feb 2024, 11:44 | 9.2 | 9.2 mg/l |
| 15 Jan 2024, 10:58 | 10.9 | 10.9 mg/l |
| 5 Dec 2023, 13:44 | 9.47 | 9.47 mg/l |
| 20 Nov 2023, 08:44 | 8.05 | 8.05 mg/l |
| 16 Oct 2023, 14:18 | 12.1 | 12.1 mg/l |
Water temperature
code 0076 · °C
18.5 °C
Sampled 2 Sep 2026, 29 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 11:36 | 18.5 | 18.5 °C |
| 6 Aug 2026, 13:15 | 19.4 | 19.4 °C |
| 2 Jul 2026, 11:50 | 21.2 | 21.2 °C |
| 4 Jun 2026, 07:46 | 16.8 | 16.8 °C |
| 14 May 2026, 07:38 | 10.6 | 10.6 °C |
| 10 Apr 2026, 08:14 | 11.8 | 11.8 °C |
| 17 Mar 2026, 08:04 | 9 | 9 °C |
| 2 Feb 2026, 08:38 | 7.2 | 7.2 °C |
| 12 Jan 2026, 07:34 | 5.4 | 5.4 °C |
| 5 Dec 2025, 07:40 | 4.9 | 4.9 °C |
| 4 Nov 2025, 07:52 | 10.9 | 10.9 °C |
| 10 Oct 2025, 07:39 | 12.2 | 12.2 °C |
| 10 Apr 2025, 07:38 | 10.6 | 10.6 °C |
| 5 Mar 2025, 07:55 | 4.7 | 4.7 °C |
| 5 Feb 2025, 07:51 | 4.8 | 4.8 °C |
| 22 Jan 2025, 11:35 | 4.9 | 4.9 °C |
| 5 Dec 2024, 14:39 | 8.8 | 8.8 °C |
| 18 Nov 2024, 11:57 | 6.7 | 6.7 °C |
| 18 Oct 2024, 12:02 | 13.1 | 13.1 °C |
| 19 Sep 2024, 13:07 | 16.7 | 16.7 °C |
| 19 Aug 2024, 12:00 | 18.9 | 18.9 °C |
| 17 Jul 2024, 09:03 | 16 | 16 °C |
| 21 Jun 2024, 11:17 | 18.7 | 18.7 °C |
| 13 May 2024, 09:49 | 19 | 19 °C |
| 15 Apr 2024, 12:13 | 10.7 | 10.7 °C |
| 18 Mar 2024, 08:37 | 9.5 | 9.5 °C |
| 19 Feb 2024, 11:44 | 9.4 | 9.4 °C |
| 15 Jan 2024, 10:58 | 4.9 | 4.9 °C |
| 5 Dec 2023, 13:44 | 7.3 | 7.3 °C |
| 20 Nov 2023, 08:44 | 9.9 | 9.9 °C |
| 16 Oct 2023, 14:18 | 9.6 | 9.6 °C |
pH
code 0061
7.68
Sampled 2 Sep 2026, 29 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 11:36 | 7.68 | 7.68 |
| 6 Aug 2026, 13:15 | 7.58 | 7.58 |
| 2 Jul 2026, 11:50 | 7.46 | 7.46 |
| 4 Jun 2026, 07:46 | 7.65 | 7.65 |
| 14 May 2026, 07:38 | 7.97 | 7.97 |
| 10 Apr 2026, 08:14 | 7.97 | 7.97 |
| 17 Mar 2026, 08:04 | 7.82 | 7.82 |
| 2 Feb 2026, 08:38 | 7.56 | 7.56 |
| 12 Jan 2026, 07:34 | 7.6 | 7.6 |
| 5 Dec 2025, 07:40 | 7.53 | 7.53 |
| 4 Nov 2025, 07:52 | 7.77 | 7.77 |
| 10 Oct 2025, 07:39 | 7.57 | 7.57 |
| 10 Apr 2025, 07:38 | 7.86 | 7.86 |
| 5 Mar 2025, 07:55 | 7.73 | 7.73 |
| 5 Feb 2025, 07:51 | 7.92 | 7.92 |
| 22 Jan 2025, 11:35 | 7.71 | 7.71 |
| 5 Dec 2024, 14:39 | 7.66 | 7.66 |
| 18 Nov 2024, 11:57 | 7.76 | 7.76 |
| 18 Oct 2024, 12:02 | 7.79 | 7.79 |
| 19 Sep 2024, 13:07 | 7.74 | 7.74 |
| 19 Aug 2024, 12:00 | 7.74 | 7.74 |
| 17 Jul 2024, 09:03 | 7.79 | 7.79 |
| 21 Jun 2024, 11:17 | 7.84 | 7.84 |
| 13 May 2024, 09:49 | 7.64 | 7.64 |
| 15 Apr 2024, 12:13 | 7.86 | 7.86 |
| 18 Mar 2024, 08:37 | 7.64 | 7.64 |
| 19 Feb 2024, 11:44 | 7.2 | 7.2 |
| 15 Jan 2024, 10:58 | 7.57 | 7.57 |
| 5 Dec 2023, 13:44 | 7.32 | 7.32 |
| 20 Nov 2023, 08:44 | 7.35 | 7.35 |
| 16 Oct 2023, 14:18 | 7.87 | 7.87 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 2 Sep 2026, 29 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 11:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Aug 2026, 13:15 | 0.053 | 0.053 mg/l |
| 2 Jul 2026, 11:50 | 0.062 | 0.062 mg/l |
| 4 Jun 2026, 07:46 | 0.062 | 0.062 mg/l |
| 14 May 2026, 07:38 | 0.032 | 0.032 mg/l |
| 10 Apr 2026, 08:14 | 0.044 | 0.044 mg/l |
| 17 Mar 2026, 08:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Feb 2026, 08:38 | 0.083 | 0.083 mg/l |
| 12 Jan 2026, 07:34 | 0.078 | 0.078 mg/l |
| 5 Dec 2025, 07:40 | 0.087 | 0.087 mg/l |
| 4 Nov 2025, 07:52 | 0.043 | 0.043 mg/l |
| 10 Oct 2025, 07:39 | 0.087 | 0.087 mg/l |
| 10 Apr 2025, 07:38 | 0.037 | 0.037 mg/l |
| 5 Mar 2025, 07:55 | 0.075 | 0.075 mg/l |
| 5 Feb 2025, 07:51 | 0.11 | 0.11 mg/l |
| 22 Jan 2025, 11:35 | 0.11 | 0.11 mg/l |
| 5 Dec 2024, 14:39 | 0.11 | 0.11 mg/l |
| 18 Nov 2024, 11:57 | 0.059 | 0.059 mg/l |
| 18 Oct 2024, 12:02 | 0.044 | 0.044 mg/l |
| 19 Sep 2024, 13:07 | 0.046 | 0.046 mg/l |
| 19 Aug 2024, 12:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jul 2024, 09:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Jun 2024, 11:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 May 2024, 09:49 | 0.091 | 0.091 mg/l |
| 15 Apr 2024, 12:13 | 0.032 | 0.032 mg/l |
| 18 Mar 2024, 08:37 | 0.082 | 0.082 mg/l |
| 19 Feb 2024, 11:44 | 0.12 | 0.12 mg/l |
| 15 Jan 2024, 10:58 | 0.16 | 0.16 mg/l |
| 5 Dec 2023, 13:44 | 0.12 | 0.12 mg/l |
| 20 Nov 2023, 08:44 | 0.082 | 0.082 mg/l |
| 16 Oct 2023, 14:18 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
below 0.196 mg/l (not detected above this)
Sampled 2 Sep 2026, 29 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 11:36 | <0.196 | below 0.196 mg/l (not detected above this) |
| 6 Aug 2026, 13:15 | <0.196 | below 0.196 mg/l (not detected above this) |
| 2 Jul 2026, 11:50 | 0.678 | 0.678 mg/l |
| 4 Jun 2026, 07:46 | 2.47 | 2.47 mg/l |
| 14 May 2026, 07:38 | 6.28 | 6.28 mg/l |
| 10 Apr 2026, 08:14 | 7.78 | 7.78 mg/l |
| 17 Mar 2026, 08:04 | 8.99 | 8.99 mg/l |
| 2 Feb 2026, 08:38 | 12 | 12 mg/l |
| 12 Jan 2026, 07:34 | 14 | 14 mg/l |
| 5 Dec 2025, 07:40 | 10.9 | 10.9 mg/l |
| 4 Nov 2025, 07:52 | 3.78 | 3.78 mg/l |
| 10 Oct 2025, 07:39 | 2.17 | 2.17 mg/l |
| 10 Apr 2025, 07:38 | 6.18 | 6.18 mg/l |
| 5 Mar 2025, 07:55 | 7.88 | 7.88 mg/l |
| 5 Feb 2025, 07:51 | 8.17 | 8.17 mg/l |
| 22 Jan 2025, 11:35 | 8.47 | 8.47 mg/l |
| 5 Dec 2024, 14:39 | 8.05 | 8.05 mg/l |
| 18 Nov 2024, 11:57 | 5.47 | 5.47 mg/l |
| 18 Oct 2024, 12:02 | 5.14 | 5.14 mg/l |
| 19 Sep 2024, 13:07 | 5.55 | 5.55 mg/l |
| 19 Aug 2024, 12:00 | 5.27 | 5.27 mg/l |
| 17 Jul 2024, 09:03 | 6.26 | 6.26 mg/l |
| 21 Jun 2024, 11:17 | 7.17 | 7.17 mg/l |
| 13 May 2024, 09:49 | 6.05 | 6.05 mg/l |
| 15 Apr 2024, 12:13 | 7.28 | 7.28 mg/l |
| 18 Mar 2024, 08:37 | 8.77 | 8.77 mg/l |
| 19 Feb 2024, 11:44 | 11 | 11 mg/l |
| 15 Jan 2024, 10:58 | 11 | 11 mg/l |
| 5 Dec 2023, 13:44 | 11.9 | 11.9 mg/l |
| 20 Nov 2023, 08:44 | 11.9 | 11.9 mg/l |
| 16 Oct 2023, 14:18 | 7.69 | 7.69 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.068 mg/l
Sampled 2 Sep 2026, 29 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 11:36 | 0.068 | 0.068 mg/l |
| 6 Aug 2026, 13:15 | 0.022 | 0.022 mg/l |
| 2 Jul 2026, 11:50 | 0.013 | 0.013 mg/l |
| 4 Jun 2026, 07:46 | <0.01 | below 0.01 mg/l (not detected above this) |
| 14 May 2026, 07:38 | 0.021 | 0.021 mg/l |
| 10 Apr 2026, 08:14 | 0.025 | 0.025 mg/l |
| 17 Mar 2026, 08:04 | 0.034 | 0.034 mg/l |
| 2 Feb 2026, 08:38 | 0.038 | 0.038 mg/l |
| 12 Jan 2026, 07:34 | 0.035 | 0.035 mg/l |
| 5 Dec 2025, 07:40 | 0.089 | 0.089 mg/l |
| 4 Nov 2025, 07:52 | 0.038 | 0.038 mg/l |
| 10 Oct 2025, 07:39 | 0.028 | 0.028 mg/l |
| 10 Apr 2025, 07:38 | 0.045 | 0.045 mg/l |
| 5 Mar 2025, 07:55 | 0.025 | 0.025 mg/l |
| 5 Feb 2025, 07:51 | 0.033 | 0.033 mg/l |
| 22 Jan 2025, 11:35 | 0.043 | 0.043 mg/l |
| 5 Dec 2024, 14:39 | 0.044 | 0.044 mg/l |
| 18 Nov 2024, 11:57 | 0.069 | 0.069 mg/l |
| 18 Oct 2024, 12:02 | 0.033 | 0.033 mg/l |
| 19 Sep 2024, 13:07 | <0.01 | below 0.01 mg/l (not detected above this) |
| 19 Aug 2024, 12:00 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Jul 2024, 09:03 | 0.022 | 0.022 mg/l |
| 21 Jun 2024, 11:17 | 0.02 | 0.02 mg/l |
| 13 May 2024, 09:49 | 0.018 | 0.018 mg/l |
| 15 Apr 2024, 12:13 | 0.023 | 0.023 mg/l |
| 18 Mar 2024, 08:37 | 0.044 | 0.044 mg/l |
| 19 Feb 2024, 11:44 | 0.057 | 0.057 mg/l |
| 15 Jan 2024, 10:58 | 0.05 | 0.05 mg/l |
| 5 Dec 2023, 13:44 | 0.049 | 0.049 mg/l |
| 20 Nov 2023, 08:44 | 0.045 | 0.045 mg/l |
| 16 Oct 2023, 14:18 | 0.018 | 0.018 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
971 µS/cm
Sampled 2 Sep 2026, 29 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 11:36 | 971 | 971 µS/cm |
| 6 Aug 2026, 13:15 | 1228 | 1228 µS/cm |
| 2 Jul 2026, 11:50 | 891 | 891 µS/cm |
| 4 Jun 2026, 07:46 | 871 | 871 µS/cm |
| 14 May 2026, 07:38 | 940 | 940 µS/cm |
| 10 Apr 2026, 08:14 | 929 | 929 µS/cm |
| 17 Mar 2026, 08:04 | 1006 | 1006 µS/cm |
| 2 Feb 2026, 08:38 | 1158 | 1158 µS/cm |
| 12 Jan 2026, 07:34 | 1200 | 1200 µS/cm |
| 5 Dec 2025, 07:40 | 1147 | 1147 µS/cm |
| 4 Nov 2025, 07:52 | 853 | 853 µS/cm |
| 10 Oct 2025, 07:39 | 944 | 944 µS/cm |
| 10 Apr 2025, 07:38 | 944 | 944 µS/cm |
| 5 Mar 2025, 07:55 | 997 | 997 µS/cm |
| 5 Feb 2025, 07:51 | 1034 | 1034 µS/cm |
| 22 Jan 2025, 11:35 | 1030 | 1030 µS/cm |
| 5 Dec 2024, 14:39 | 1044 | 1044 µS/cm |
| 18 Nov 2024, 11:57 | 888 | 888 µS/cm |
| 18 Oct 2024, 12:02 | 888 | 888 µS/cm |
| 19 Sep 2024, 13:07 | 862 | 862 µS/cm |
| 19 Aug 2024, 12:00 | 816 | 816 µS/cm |
| 17 Jul 2024, 09:03 | 780 | 780 µS/cm |
| 21 Jun 2024, 11:17 | 848 | 848 µS/cm |
| 13 May 2024, 09:49 | 921 | 921 µS/cm |
| 15 Apr 2024, 12:13 | 977 | 977 µS/cm |
| 18 Mar 2024, 08:37 | 945 | 945 µS/cm |
| 19 Feb 2024, 11:44 | 871 | 871 µS/cm |
| 15 Jan 2024, 10:58 | 998 | 998 µS/cm |
| 5 Dec 2023, 13:44 | 1068 | 1068 µS/cm |
| 20 Nov 2023, 08:44 | 1113 | 1113 µS/cm |
| 16 Oct 2023, 14:18 | 893 | 893 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 | 31 | Oct 2023 – Sep 2026 | 37.6% 2 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 31 | Oct 2023 – Sep 2026 | 3.51 mg/l 2 Sep 2026 |
| Temperature of Water 0076 | River water | 31 | Oct 2023 – Sep 2026 | 18.5 °C 2 Sep 2026 |
| pH 0061 | River water | 31 | Oct 2023 – Sep 2026 | 7.68 2 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 31 | Oct 2023 – Sep 2026 | below 0.03 mg/l 2 Sep 2026 |
| Nitrate as N 0117 | River water | 31 | Oct 2023 – Sep 2026 | below 0.196 mg/l 2 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 31 | Oct 2023 – Sep 2026 | 0.068 mg/l 2 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 31 | Oct 2023 – Sep 2026 | 971 µS/cm 2 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 31 | Oct 2023 – Sep 2026 | 270 mg/l 2 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 31 | Oct 2023 – Sep 2026 | below 0.00049 mg/l 2 Sep 2026 |
| BOD : 5 Day ATU 0085 | River water | 14 | Feb 2024 – Mar 2025 | 1.3 mg/l 5 Mar 2025 |
| Nitrite as N 0118 | River water | 31 | Oct 2023 – Sep 2026 | below 0.004 mg/l 2 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 31 | Oct 2023 – Sep 2026 | below 0.2 mg/l 2 Sep 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.