West Looe River at Sowdens Bridge
EA name: WEST LOOE RIVER AT SOWDENS BRIDGE (also listed as “WEST LOOE RIVER AT SOWDEN'S BRIDGE”)
Environment Agency sampling point SW-81430304 · 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
- 11 May 2026, 13:475 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone). Not sampled since, as far as the archive shows: the Environment Agency was asked up to 30 Sep 2026 and had nothing newer.
- Samples banked
- 31 since 11 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 223029, 55576As published, to the nearest 1 m. Open in a map
- River, by its own name
- West Looe
- River, by the map
- West Looe RiverPlaced on the river its name gives, 6 m from the line.
- Next gauge downstream
- None tracedIts water reaches the sea without passing a gauge.
- Why it was sampled
- Monitoring (national agency policy) (31 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
98%
Sampled 11 May 2026, 5 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 May 2026, 13:47 | 98 | 98% |
| 20 Apr 2026, 14:53 | 105.7 | 105.7% |
| 23 Mar 2026, 14:04 | 101.1 | 101.1% |
| 12 Feb 2026, 11:12 | 98.7 | 98.7% |
| 22 Jan 2026, 13:03 | 98.3 | 98.3% |
| 8 Dec 2025, 10:21 | 97.5 | 97.5% |
| 18 Nov 2025, 11:08 | 101.4 | 101.4% |
| 3 Oct 2025, 13:12 | 98.2 | 98.2% |
| 3 Sep 2025, 10:43 | 95.8 | 95.8% |
| 7 Aug 2025, 10:47 | 97.6 | 97.6% |
| 25 Jul 2025, 10:13 | 98.6 | 98.6% |
| 9 Jun 2025, 12:30 | 100 | 100% |
| 6 May 2025, 12:23 | 101.9 | 101.9% |
| 2 Apr 2025, 12:50 | 102.2 | 102.2% |
| 17 Mar 2025, 15:11 | 102.7 | 102.7% |
| 14 Feb 2025, 11:22 | 99 | 99% |
| 23 Jan 2025, 11:55 | 98.5 | 98.5% |
| 10 Dec 2024, 10:22 | 100 | 100% |
| 25 Nov 2024, 12:52 | 98.8 | 98.8% |
| 22 Oct 2024, 11:13 | 98.9 | 98.9% |
| 20 Sep 2024, 13:13 | 100.4 | 100.4% |
| 28 Aug 2024, 14:04 | 97.9 | 97.9% |
| 18 Jul 2024, 11:49 | 98.5 | 98.5% |
| 17 Jun 2024, 14:12 | 100.1 | 100.1% |
| 4 Mar 2024, 14:09 | 98.3 | 98.3% |
| 14 Feb 2024, 13:56 | 98.6 | 98.6% |
| 13 Feb 2024, 11:32 | 99.4 | 99.4% |
| 8 Jan 2024, 12:25 | 97.8 | 97.8% |
| 7 Dec 2023, 11:01 | 97.4 | 97.4% |
| 9 Nov 2023, 11:28 | 100.5 | 100.5% |
| 11 Oct 2023, 10:30 | 98.3 | 98.3% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.7 mg/l
Sampled 11 May 2026, 5 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 May 2026, 13:47 | 10.7 | 10.7 mg/l |
| 20 Apr 2026, 14:53 | 11.8 | 11.8 mg/l |
| 23 Mar 2026, 14:04 | 11.3 | 11.3 mg/l |
| 12 Feb 2026, 11:12 | 11 | 11 mg/l |
| 22 Jan 2026, 13:03 | 11 | 11 mg/l |
| 8 Dec 2025, 10:21 | 10.5 | 10.5 mg/l |
| 18 Nov 2025, 11:08 | 11.6 | 11.6 mg/l |
| 3 Oct 2025, 13:12 | 10.1 | 10.1 mg/l |
| 3 Sep 2025, 10:43 | 9.64 | 9.64 mg/l |
| 7 Aug 2025, 10:47 | 9.9 | 9.9 mg/l |
| 25 Jul 2025, 10:13 | 10.2 | 10.2 mg/l |
| 9 Jun 2025, 12:30 | 10.5 | 10.5 mg/l |
| 6 May 2025, 12:23 | 11.5 | 11.5 mg/l |
| 2 Apr 2025, 12:50 | 11.4 | 11.4 mg/l |
| 17 Mar 2025, 15:11 | 12.2 | 12.2 mg/l |
| 14 Feb 2025, 11:22 | 11.9 | 11.9 mg/l |
| 23 Jan 2025, 11:55 | 11.7 | 11.7 mg/l |
| 10 Dec 2024, 10:22 | 11.5 | 11.5 mg/l |
| 25 Nov 2024, 12:52 | 10.9 | 10.9 mg/l |
| 22 Oct 2024, 11:13 | 10.6 | 10.6 mg/l |
| 20 Sep 2024, 13:13 | 10.3 | 10.3 mg/l |
| 28 Aug 2024, 14:04 | 9.8 | 9.8 mg/l |
| 18 Jul 2024, 11:49 | 10.1 | 10.1 mg/l |
| 17 Jun 2024, 14:12 | 10.5 | 10.5 mg/l |
| 4 Mar 2024, 14:09 | 11.5 | 11.5 mg/l |
| 14 Feb 2024, 13:56 | 10.8 | 10.8 mg/l |
| 13 Feb 2024, 11:32 | 11.1 | 11.1 mg/l |
| 8 Jan 2024, 12:25 | 11.6 | 11.6 mg/l |
| 7 Dec 2023, 11:01 | 10.7 | 10.7 mg/l |
| 9 Nov 2023, 11:28 | 11 | 11 mg/l |
| 11 Oct 2023, 10:30 | 10.1 | 10.1 mg/l |
Water temperature
code 0076 · °C
11.4 °C
Sampled 11 May 2026, 5 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 May 2026, 13:47 | 11.4 | 11.4 °C |
| 20 Apr 2026, 14:53 | 10.4 | 10.4 °C |
| 23 Mar 2026, 14:04 | 10.5 | 10.5 °C |
| 12 Feb 2026, 11:12 | 10.6 | 10.6 °C |
| 22 Jan 2026, 13:03 | 10.3 | 10.3 °C |
| 8 Dec 2025, 10:21 | 11.8 | 11.8 °C |
| 18 Nov 2025, 11:08 | 9.2 | 9.2 °C |
| 3 Oct 2025, 13:12 | 14 | 14 °C |
| 3 Sep 2025, 10:43 | 15 | 15 °C |
| 7 Aug 2025, 10:47 | 14.6 | 14.6 °C |
| 25 Jul 2025, 10:13 | 13.7 | 13.7 °C |
| 9 Jun 2025, 12:30 | 13.2 | 13.2 °C |
| 6 May 2025, 12:23 | 10 | 10 °C |
| 2 Apr 2025, 12:50 | 10.3 | 10.3 °C |
| 17 Mar 2025, 15:11 | 7.8 | 7.8 °C |
| 14 Feb 2025, 11:22 | 7.5 | 7.5 °C |
| 23 Jan 2025, 11:55 | 7.9 | 7.9 °C |
| 10 Dec 2024, 10:22 | 9.2 | 9.2 °C |
| 25 Nov 2024, 12:52 | 11 | 11 °C |
| 22 Oct 2024, 11:13 | 12.2 | 12.2 °C |
| 20 Sep 2024, 13:13 | 13.9 | 13.9 °C |
| 28 Aug 2024, 14:04 | 15.2 | 15.2 °C |
| 18 Jul 2024, 11:49 | 14 | 14 °C |
| 17 Jun 2024, 14:12 | 13.2 | 13.2 °C |
| 4 Mar 2024, 14:09 | 8.6 | 8.6 °C |
| 14 Feb 2024, 13:56 | 11.3 | 11.3 °C |
| 13 Feb 2024, 11:32 | 10.2 | 10.2 °C |
| 8 Jan 2024, 12:25 | 7.9 | 7.9 °C |
| 7 Dec 2023, 11:01 | 11.1 | 11.1 °C |
| 9 Nov 2023, 11:28 | 11.1 | 11.1 °C |
| 11 Oct 2023, 10:30 | 13.8 | 13.8 °C |
pH
code 0061
7.89
Sampled 11 May 2026, 5 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 May 2026, 13:47 | 7.89 | 7.89 |
| 20 Apr 2026, 14:53 | 8.65 | 8.65 |
| 23 Mar 2026, 14:04 | 7.89 | 7.89 |
| 12 Feb 2026, 11:12 | 7.54 | 7.54 |
| 22 Jan 2026, 13:03 | 7.27 | 7.27 |
| 8 Dec 2025, 10:21 | 7.39 | 7.39 |
| 18 Nov 2025, 11:08 | 7.43 | 7.43 |
| 3 Oct 2025, 13:12 | 7.93 | 7.93 |
| 3 Sep 2025, 10:43 | 7.64 | 7.64 |
| 7 Aug 2025, 10:47 | 7.84 | 7.84 |
| 25 Jul 2025, 10:13 | 8.06 | 8.06 |
| 9 Jun 2025, 12:30 | 7.87 | 7.87 |
| 6 May 2025, 12:23 | 7.86 | 7.86 |
| 2 Apr 2025, 12:50 | 7.92 | 7.92 |
| 17 Mar 2025, 15:11 | 7.83 | 7.83 |
| 14 Feb 2025, 11:22 | 7.74 | 7.74 |
| 23 Jan 2025, 11:55 | 7.86 | 7.86 |
| 10 Dec 2024, 10:22 | 7.59 | 7.59 |
| 25 Nov 2024, 12:52 | 7.51 | 7.51 |
| 22 Oct 2024, 11:13 | 7.54 | 7.54 |
| 20 Sep 2024, 13:13 | 7.89 | 7.89 |
| 28 Aug 2024, 14:04 | 7.83 | 7.83 |
| 18 Jul 2024, 11:49 | 7.48 | 7.48 |
| 17 Jun 2024, 14:12 | 7.9 | 7.9 |
| 4 Mar 2024, 14:09 | 7.31 | 7.31 |
| 14 Feb 2024, 13:56 | 7.51 | 7.51 |
| 13 Feb 2024, 11:32 | 7.76 | 7.76 |
| 8 Jan 2024, 12:25 | 7.73 | 7.73 |
| 7 Dec 2023, 11:01 | 7.49 | 7.49 |
| 9 Nov 2023, 11:28 | 7.48 | 7.48 |
| 11 Oct 2023, 10:30 | 7.66 | 7.66 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 11 May 2026, 5 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 May 2026, 13:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Apr 2026, 14:53 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Mar 2026, 14:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Feb 2026, 11:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Jan 2026, 13:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Dec 2025, 10:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Nov 2025, 11:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Oct 2025, 13:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Sep 2025, 10:43 | 0.085 | 0.085 mg/l |
| 7 Aug 2025, 10:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Jul 2025, 10:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jun 2025, 12:30 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 May 2025, 12:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Apr 2025, 12:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Mar 2025, 15:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Feb 2025, 11:22 | 0.14 | 0.14 mg/l |
| 23 Jan 2025, 11:55 | 0.24 | 0.24 mg/l |
| 10 Dec 2024, 10:22 | 0.044 | 0.044 mg/l |
| 25 Nov 2024, 12:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Oct 2024, 11:13 | 0.044 | 0.044 mg/l |
| 20 Sep 2024, 13:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 Aug 2024, 14:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Jul 2024, 11:49 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jun 2024, 14:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Mar 2024, 14:09 | 0.16 | 0.16 mg/l |
| 14 Feb 2024, 13:56 | 0.11 | 0.11 mg/l |
| 13 Feb 2024, 11:32 | 0.063 | 0.063 mg/l |
| 8 Jan 2024, 12:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Dec 2023, 11:01 | 0.1 | 0.1 mg/l |
| 9 Nov 2023, 11:28 | 0.034 | 0.034 mg/l |
| 11 Oct 2023, 10:30 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
3.39 mg/l
Sampled 11 May 2026, 5 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 May 2026, 13:47 | 3.39 | 3.39 mg/l |
| 20 Apr 2026, 14:53 | 3.39 | 3.39 mg/l |
| 23 Mar 2026, 14:04 | 3.79 | 3.79 mg/l |
| 12 Feb 2026, 11:12 | 3.8 | 3.8 mg/l |
| 22 Jan 2026, 13:03 | 3.8 | 3.8 mg/l |
| 8 Dec 2025, 10:21 | 4.4 | 4.4 mg/l |
| 18 Nov 2025, 11:08 | 4.39 | 4.39 mg/l |
| 3 Oct 2025, 13:12 | 3.19 | 3.19 mg/l |
| 3 Sep 2025, 10:43 | 2.19 | 2.19 mg/l |
| 7 Aug 2025, 10:47 | 3 | 3 mg/l |
| 25 Jul 2025, 10:13 | 3.1 | 3.1 mg/l |
| 9 Jun 2025, 12:30 | 3.29 | 3.29 mg/l |
| 6 May 2025, 12:23 | 3.7 | 3.7 mg/l |
| 2 Apr 2025, 12:50 | 3.9 | 3.9 mg/l |
| 17 Mar 2025, 15:11 | 4.1 | 4.1 mg/l |
| 14 Feb 2025, 11:22 | 4.09 | 4.09 mg/l |
| 23 Jan 2025, 11:55 | 4.09 | 4.09 mg/l |
| 10 Dec 2024, 10:22 | 4.28 | 4.28 mg/l |
| 25 Nov 2024, 12:52 | 3.59 | 3.59 mg/l |
| 22 Oct 2024, 11:13 | 3.99 | 3.99 mg/l |
| 20 Sep 2024, 13:13 | 3.5 | 3.5 mg/l |
| 28 Aug 2024, 14:04 | 3.2 | 3.2 mg/l |
| 18 Jul 2024, 11:49 | 3.49 | 3.49 mg/l |
| 17 Jun 2024, 14:12 | 3.89 | 3.89 mg/l |
| 4 Mar 2024, 14:09 | 2.28 | 2.28 mg/l |
| 14 Feb 2024, 13:56 | 4.19 | 4.19 mg/l |
| 13 Feb 2024, 11:32 | 3.89 | 3.89 mg/l |
| 8 Jan 2024, 12:25 | 4.4 | 4.4 mg/l |
| 7 Dec 2023, 11:01 | 3.49 | 3.49 mg/l |
| 9 Nov 2023, 11:28 | 4.19 | 4.19 mg/l |
| 11 Oct 2023, 10:30 | 3.89 | 3.89 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.032 mg/l
Sampled 11 May 2026, 5 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 May 2026, 13:47 | 0.032 | 0.032 mg/l |
| 20 Apr 2026, 14:53 | 0.015 | 0.015 mg/l |
| 23 Mar 2026, 14:04 | 0.015 | 0.015 mg/l |
| 12 Feb 2026, 11:12 | 0.025 | 0.025 mg/l |
| 22 Jan 2026, 13:03 | 0.016 | 0.016 mg/l |
| 8 Dec 2025, 10:21 | 0.017 | 0.017 mg/l |
| 18 Nov 2025, 11:08 | 0.015 | 0.015 mg/l |
| 3 Oct 2025, 13:12 | 0.033 | 0.033 mg/l |
| 3 Sep 2025, 10:43 | 0.07 | 0.07 mg/l |
| 7 Aug 2025, 10:47 | 0.045 | 0.045 mg/l |
| 25 Jul 2025, 10:13 | 0.045 | 0.045 mg/l |
| 9 Jun 2025, 12:30 | 0.034 | 0.034 mg/l |
| 6 May 2025, 12:23 | 0.019 | 0.019 mg/l |
| 2 Apr 2025, 12:50 | 0.019 | 0.019 mg/l |
| 17 Mar 2025, 15:11 | 0.02 | 0.02 mg/l |
| 14 Feb 2025, 11:22 | 0.035 | 0.035 mg/l |
| 23 Jan 2025, 11:55 | 0.035 | 0.035 mg/l |
| 10 Dec 2024, 10:22 | 0.014 | 0.014 mg/l |
| 25 Nov 2024, 12:52 | 0.015 | 0.015 mg/l |
| 22 Oct 2024, 11:13 | 0.014 | 0.014 mg/l |
| 20 Sep 2024, 13:13 | 0.03 | 0.03 mg/l |
| 28 Aug 2024, 14:04 | 0.03 | 0.03 mg/l |
| 18 Jul 2024, 11:49 | 0.025 | 0.025 mg/l |
| 17 Jun 2024, 14:12 | 0.031 | 0.031 mg/l |
| 4 Mar 2024, 14:09 | 0.03 | 0.03 mg/l |
| 14 Feb 2024, 13:56 | 0.023 | 0.023 mg/l |
| 13 Feb 2024, 11:32 | 0.021 | 0.021 mg/l |
| 8 Jan 2024, 12:25 | 0.013 | 0.013 mg/l |
| 7 Dec 2023, 11:01 | 0.03 | 0.03 mg/l |
| 9 Nov 2023, 11:28 | 0.014 | 0.014 mg/l |
| 11 Oct 2023, 10:30 | 0.046 | 0.046 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
235 µS/cm
Sampled 11 May 2026, 5 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 May 2026, 13:47 | 235 | 235 µS/cm |
| 20 Apr 2026, 14:53 | 222 | 222 µS/cm |
| 23 Mar 2026, 14:04 | 210 | 210 µS/cm |
| 12 Feb 2026, 11:12 | 190 | 190 µS/cm |
| 22 Jan 2026, 13:03 | 173 | 173 µS/cm |
| 8 Dec 2025, 10:21 | 190 | 190 µS/cm |
| 18 Nov 2025, 11:08 | 217 | 217 µS/cm |
| 3 Oct 2025, 13:12 | 220 | 220 µS/cm |
| 3 Sep 2025, 10:43 | 240 | 240 µS/cm |
| 7 Aug 2025, 10:47 | 265 | 265 µS/cm |
| 25 Jul 2025, 10:13 | 254 | 254 µS/cm |
| 9 Jun 2025, 12:30 | 233 | 233 µS/cm |
| 6 May 2025, 12:23 | 215 | 215 µS/cm |
| 2 Apr 2025, 12:50 | 232 | 232 µS/cm |
| 17 Mar 2025, 15:11 | 222 | 222 µS/cm |
| 14 Feb 2025, 11:22 | 229 | 229 µS/cm |
| 23 Jan 2025, 11:55 | 232 | 232 µS/cm |
| 10 Dec 2024, 10:22 | 200 | 200 µS/cm |
| 25 Nov 2024, 12:52 | 172 | 172 µS/cm |
| 22 Oct 2024, 11:13 | 188 | 188 µS/cm |
| 20 Sep 2024, 13:13 | 259 | 259 µS/cm |
| 28 Aug 2024, 14:04 | 239 | 239 µS/cm |
| 18 Jul 2024, 11:49 | 227 | 227 µS/cm |
| 17 Jun 2024, 14:12 | 229 | 229 µS/cm |
| 4 Mar 2024, 14:09 | 147 | 147 µS/cm |
| 14 Feb 2024, 13:56 | 191 | 191 µS/cm |
| 13 Feb 2024, 11:32 | 189 | 189 µS/cm |
| 8 Jan 2024, 12:25 | 201 | 201 µS/cm |
| 7 Dec 2023, 11:01 | 169 | 169 µS/cm |
| 9 Nov 2023, 11:28 | 190 | 190 µS/cm |
| 11 Oct 2023, 10:30 | 256 | 256 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 – May 2026 | 98% 11 May 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 31 | Oct 2023 – May 2026 | 10.7 mg/l 11 May 2026 |
| Temperature of Water 0076 | River water | 31 | Oct 2023 – May 2026 | 11.4 °C 11 May 2026 |
| pH 0061 | River water | 31 | Oct 2023 – May 2026 | 7.89 11 May 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 31 | Oct 2023 – May 2026 | below 0.03 mg/l 11 May 2026 |
| Nitrate as N 0117 | River water | 31 | Oct 2023 – May 2026 | 3.39 mg/l 11 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 31 | Oct 2023 – May 2026 | 0.032 mg/l 11 May 2026 |
| Conductivity at 25 C 0077 | River water | 31 | Oct 2023 – May 2026 | 235 µS/cm 11 May 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 30 | Oct 2023 – May 2026 | 57 mg/l 11 May 2026 |
| Ammonia un-ionised as N 0119 | River water | 31 | Oct 2023 – May 2026 | below 0.00047 mg/l 11 May 2026 |
| BOD : 5 Day ATU 0085 | River water | 22 | Jun 2024 – May 2026 | 1.2 mg/l 11 May 2026 |
| Nitrite as N 0118 | River water | 31 | Oct 2023 – May 2026 | 0.0052 mg/l 11 May 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 31 | Oct 2023 – May 2026 | 3.4 mg/l 11 May 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.