Counterdrain Welches Dam
EA name: COUNTERDRAIN WELCHES DAM
Environment Agency sampling point AN-52M04 · 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
- 14 Sep 2026, 16:0417 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 34 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 Planned investigation (local monitoring)
- Where
- National Grid 547000, 285800As published, to the nearest 100 m (so up to about 70 m out). Open in a map
- River, by its own name
- Counterdrain
- River, by the map
- Counter DrainPlaced on the river its name gives, 23 m from the line.
- Next gauge downstream
- Welches Dam On the Counter Drain · 0.2 km along the river
- Why it was sampled
- Monitoring (national agency policy) (24 samples)
Planned investigation (local monitoring) (10 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
99.7%
Sampled 14 Sep 2026, 17 days ago · 34 results banked
Every result (34)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Sep 2026, 16:04 | 99.7 | 99.7% |
| 11 Aug 2026, 11:17 | 51.1 | 51.1% |
| 9 Jul 2026, 11:45 | 100.1 | 100.1% |
| 17 Jun 2026, 11:28 | 128.1 | 128.1% |
| 18 May 2026, 12:49 | 137.5 | 137.5% |
| 23 Apr 2026, 14:23 | 121.2 | 121.2% |
| 12 Mar 2026, 11:55 | 97 | 97% |
| 12 Feb 2026, 14:21 | 67.5 | 67.5% |
| 8 Jan 2026, 14:41 | 69.1 | 69.1% |
| 9 Dec 2025, 14:51 | 85 | 85% |
| 17 Nov 2025, 13:30 | 55.5 | 55.5% |
| 24 Oct 2025, 11:43 | 71.8 | 71.8% |
| 9 Sep 2025, 15:19 | 123.8 | 123.8% |
| 15 Aug 2025, 10:45 | 78.4 | 78.4% |
| 17 Jul 2025, 13:16 | 56.1 | 56.1% |
| 10 Jun 2025, 15:03 | 118.9 | 118.9% |
| 14 May 2025, 10:56 | 101.9 | 101.9% |
| 23 Apr 2025, 11:26 | 117.1 | 117.1% |
| 6 Mar 2025, 15:40 | 83.5 | 83.5% |
| 6 Feb 2025, 12:57 | 73.9 | 73.9% |
| 22 Jan 2025, 11:55 | 68.6 | 68.6% |
| 3 Dec 2024, 09:37 | 63.2 | 63.2% |
| 18 Nov 2024, 14:24 | 70.5 | 70.5% |
| 25 Oct 2024, 15:24 | 63.6 | 63.6% |
| 16 Sep 2024, 09:29 | 62.1 | 62.1% |
| 19 Aug 2024, 14:56 | 77.5 | 77.5% |
| 17 Jul 2024, 11:41 | 59.8 | 59.8% |
| 18 Jun 2024, 13:16 | 91 | 91% |
| 8 Mar 2024, 15:35 | 84 | 84% |
| 5 Feb 2024, 14:19 | 94.1 | 94.1% |
| 2 Jan 2024, 13:49 | 82.9 | 82.9% |
| 6 Dec 2023, 09:24 | 67.8 | 67.8% |
| 6 Nov 2023, 12:00 | 65.8 | 65.8% |
| 9 Oct 2023, 09:58 | 32.4 | 32.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.04 mg/l
Sampled 14 Sep 2026, 17 days ago · 34 results banked
Every result (34)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Sep 2026, 16:04 | 9.04 | 9.04 mg/l |
| 11 Aug 2026, 11:17 | 4.63 | 4.63 mg/l |
| 9 Jul 2026, 11:45 | 8.19 | 8.19 mg/l |
| 17 Jun 2026, 11:28 | 11.6 | 11.6 mg/l |
| 18 May 2026, 12:49 | 14 | 14 mg/l |
| 23 Apr 2026, 14:23 | 12.2 | 12.2 mg/l |
| 12 Mar 2026, 11:55 | 11 | 11 mg/l |
| 12 Feb 2026, 14:21 | 7.92 | 7.92 mg/l |
| 8 Jan 2026, 14:41 | 9.75 | 9.75 mg/l |
| 9 Dec 2025, 14:51 | 9.58 | 9.58 mg/l |
| 17 Nov 2025, 13:30 | 6.37 | 6.37 mg/l |
| 24 Oct 2025, 11:43 | 8.09 | 8.09 mg/l |
| 9 Sep 2025, 15:19 | 11.4 | 11.4 mg/l |
| 15 Aug 2025, 10:45 | 6.81 | 6.81 mg/l |
| 17 Jul 2025, 13:16 | 5.03 | 5.03 mg/l |
| 10 Jun 2025, 15:03 | 11.1 | 11.1 mg/l |
| 14 May 2025, 10:56 | 9.41 | 9.41 mg/l |
| 23 Apr 2025, 11:26 | 12 | 12 mg/l |
| 6 Mar 2025, 15:40 | 9.8 | 9.8 mg/l |
| 6 Feb 2025, 12:57 | 9.43 | 9.43 mg/l |
| 22 Jan 2025, 11:55 | 8.96 | 8.96 mg/l |
| 3 Dec 2024, 09:37 | 7.6 | 7.6 mg/l |
| 18 Nov 2024, 14:24 | 8.38 | 8.38 mg/l |
| 25 Oct 2024, 15:24 | 6.72 | 6.72 mg/l |
| 16 Sep 2024, 09:29 | 6.47 | 6.47 mg/l |
| 19 Aug 2024, 14:56 | 6.91 | 6.91 mg/l |
| 17 Jul 2024, 11:41 | 5.68 | 5.68 mg/l |
| 18 Jun 2024, 13:16 | 8.61 | 8.61 mg/l |
| 8 Mar 2024, 15:35 | 9.73 | 9.73 mg/l |
| 5 Feb 2024, 14:19 | 10.8 | 10.8 mg/l |
| 2 Jan 2024, 13:49 | 9.79 | 9.79 mg/l |
| 6 Dec 2023, 09:24 | 8.64 | 8.64 mg/l |
| 6 Nov 2023, 12:00 | 7.48 | 7.48 mg/l |
| 9 Oct 2023, 09:58 | 3.21 | 3.21 mg/l |
Water temperature
code 0076 · °C
20 °C
Sampled 14 Sep 2026, 17 days ago · 34 results banked
Every result (34)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Sep 2026, 16:04 | 20 | 20 °C |
| 11 Aug 2026, 11:17 | 20.1 | 20.1 °C |
| 9 Jul 2026, 11:45 | 25.4 | 25.4 °C |
| 17 Jun 2026, 11:28 | 20 | 20 °C |
| 18 May 2026, 12:49 | 14.6 | 14.6 °C |
| 23 Apr 2026, 14:23 | 14.8 | 14.8 °C |
| 12 Mar 2026, 11:55 | 9.8 | 9.8 °C |
| 12 Feb 2026, 14:21 | 8.3 | 8.3 °C |
| 8 Jan 2026, 14:41 | 1.2 | 1.2 °C |
| 9 Dec 2025, 14:51 | 10 | 10 °C |
| 17 Nov 2025, 13:30 | 9.2 | 9.2 °C |
| 24 Oct 2025, 11:43 | 10 | 10 °C |
| 9 Sep 2025, 15:19 | 19.3 | 19.3 °C |
| 15 Aug 2025, 10:45 | 22.2 | 22.2 °C |
| 17 Jul 2025, 13:16 | 20.6 | 20.6 °C |
| 10 Jun 2025, 15:03 | 18.6 | 18.6 °C |
| 14 May 2025, 10:56 | 19.1 | 19.1 °C |
| 23 Apr 2025, 11:26 | 14.1 | 14.1 °C |
| 6 Mar 2025, 15:40 | 8.3 | 8.3 °C |
| 6 Feb 2025, 12:57 | 5 | 5 °C |
| 22 Jan 2025, 11:55 | 4.1 | 4.1 °C |
| 3 Dec 2024, 09:37 | 7.3 | 7.3 °C |
| 18 Nov 2024, 14:24 | 7.8 | 7.8 °C |
| 25 Oct 2024, 15:24 | 12.8 | 12.8 °C |
| 16 Sep 2024, 09:29 | 13.4 | 13.4 °C |
| 19 Aug 2024, 14:56 | 20.9 | 20.9 °C |
| 17 Jul 2024, 11:41 | 17.7 | 17.7 °C |
| 18 Jun 2024, 13:16 | 17.9 | 17.9 °C |
| 8 Mar 2024, 15:35 | 8.8 | 8.8 °C |
| 5 Feb 2024, 14:19 | 9.1 | 9.1 °C |
| 2 Jan 2024, 13:49 | 8 | 8 °C |
| 6 Dec 2023, 09:24 | 5 | 5 °C |
| 6 Nov 2023, 12:00 | 9.6 | 9.6 °C |
| 9 Oct 2023, 09:58 | 15.7 | 15.7 °C |
pH
code 0061
7.93
Sampled 14 Sep 2026, 17 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Sep 2026, 16:04 | 7.93 | 7.93 |
| 11 Aug 2026, 11:17 | 7.38 | 7.38 |
| 9 Jul 2026, 11:45 | 7.76 | 7.76 |
| 17 Jun 2026, 11:28 | 8.07 | 8.07 |
| 18 May 2026, 12:49 | 8.39 | 8.39 |
| 23 Apr 2026, 14:23 | 8.3 | 8.3 |
| 12 Mar 2026, 11:55 | 7.83 | 7.83 |
| 12 Feb 2026, 14:21 | 7.2 | 7.2 |
| 8 Jan 2026, 14:41 | 7.18 | 7.18 |
| 9 Dec 2025, 14:51 | 7.46 | 7.46 |
| 17 Nov 2025, 13:30 | 7.38 | 7.38 |
| 24 Oct 2025, 11:43 | 7.74 | 7.74 |
| 9 Sep 2025, 15:19 | 8.58 | 8.58 |
| 15 Aug 2025, 10:45 | 7.7 | 7.7 |
| 17 Jul 2025, 13:16 | 7.44 | 7.44 |
| 10 Jun 2025, 15:03 | 8.18 | 8.18 |
| 14 May 2025, 10:56 | 8.13 | 8.13 |
| 23 Apr 2025, 11:26 | 8.09 | 8.09 |
| 6 Mar 2025, 15:40 | 7.38 | 7.38 |
| 6 Feb 2025, 12:57 | 7.42 | 7.42 |
| 22 Jan 2025, 11:55 | 7.38 | 7.38 |
| 3 Dec 2024, 09:37 | 7.48 | 7.48 |
| 18 Nov 2024, 14:24 | 7.58 | 7.58 |
| 25 Oct 2024, 15:24 | 7.22 | 7.22 |
| 16 Sep 2024, 09:29 | 7.54 | 7.54 |
| 19 Aug 2024, 14:56 | 7.73 | 7.73 |
| 17 Jul 2024, 11:41 | 7.49 | 7.49 |
| 18 Jun 2024, 13:16 | 7.74 | 7.74 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 18 May 2026, 4 months ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 12:49 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Apr 2026, 14:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Mar 2026, 11:55 | 1 | 1 mg/l |
| 12 Feb 2026, 14:21 | 1.5 | 1.5 mg/l |
| 8 Jan 2026, 14:41 | 2.5 | 2.5 mg/l |
| 9 Dec 2025, 14:51 | 1.3 | 1.3 mg/l |
| 17 Nov 2025, 13:30 | 0.54 | 0.54 mg/l |
| 24 Oct 2025, 11:43 | 0.14 | 0.14 mg/l |
| 9 Sep 2025, 15:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Aug 2025, 10:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jul 2025, 13:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Jun 2025, 15:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 May 2025, 10:56 | 0.041 | 0.041 mg/l |
| 23 Apr 2025, 11:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Mar 2025, 15:40 | 2.3 | 2.3 mg/l |
| 6 Feb 2025, 12:57 | 1.5 | 1.5 mg/l |
| 22 Jan 2025, 11:55 | 1.7 | 1.7 mg/l |
| 3 Dec 2024, 09:37 | 0.93 | 0.93 mg/l |
| 18 Nov 2024, 14:24 | 0.6 | 0.6 mg/l |
| 25 Oct 2024, 15:24 | 0.62 | 0.62 mg/l |
| 16 Sep 2024, 09:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Aug 2024, 14:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jul 2024, 11:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Jun 2024, 13:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Mar 2024, 15:35 | 1.4 | 1.4 mg/l |
| 5 Feb 2024, 14:19 | 1.5 | 1.5 mg/l |
| 2 Jan 2024, 13:49 | 1.6 | 1.6 mg/l |
| 6 Dec 2023, 09:24 | 1.6 | 1.6 mg/l |
| 6 Nov 2023, 12:00 | 0.59 | 0.59 mg/l |
| 9 Oct 2023, 09:58 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
3.75 mg/l
Sampled 18 May 2026, 4 months ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 12:49 | 3.75 | 3.75 mg/l |
| 23 Apr 2026, 14:23 | 2.18 | 2.18 mg/l |
| 12 Mar 2026, 11:55 | 5.92 | 5.92 mg/l |
| 12 Feb 2026, 14:21 | 11.9 | 11.9 mg/l |
| 8 Jan 2026, 14:41 | 5.55 | 5.55 mg/l |
| 9 Dec 2025, 14:51 | 11.9 | 11.9 mg/l |
| 17 Nov 2025, 13:30 | 9.46 | 9.46 mg/l |
| 24 Oct 2025, 11:43 | <0.196 | below 0.196 mg/l (not detected above this) |
| 9 Sep 2025, 15:19 | <0.196 | below 0.196 mg/l (not detected above this) |
| 15 Aug 2025, 10:45 | <0.196 | below 0.196 mg/l (not detected above this) |
| 17 Jul 2025, 13:16 | 0.314 | 0.314 mg/l |
| 10 Jun 2025, 15:03 | 1.47 | 1.47 mg/l |
| 14 May 2025, 10:56 | 1.46 | 1.46 mg/l |
| 23 Apr 2025, 11:26 | 3.19 | 3.19 mg/l |
| 6 Mar 2025, 15:40 | 6.85 | 6.85 mg/l |
| 6 Feb 2025, 12:57 | 6.65 | 6.65 mg/l |
| 22 Jan 2025, 11:55 | 6.14 | 6.14 mg/l |
| 3 Dec 2024, 09:37 | 7.89 | 7.89 mg/l |
| 18 Nov 2024, 14:24 | 3.27 | 3.27 mg/l |
| 25 Oct 2024, 15:24 | 5.42 | 5.42 mg/l |
| 16 Sep 2024, 09:29 | <0.196 | below 0.196 mg/l (not detected above this) |
| 19 Aug 2024, 14:56 | <0.196 | below 0.196 mg/l (not detected above this) |
| 17 Jul 2024, 11:41 | 0.475 | 0.475 mg/l |
| 18 Jun 2024, 13:16 | 1.29 | 1.29 mg/l |
| 8 Mar 2024, 15:35 | 9.31 | 9.31 mg/l |
| 5 Feb 2024, 14:19 | 7.1 | 7.1 mg/l |
| 2 Jan 2024, 13:49 | 11.9 | 11.9 mg/l |
| 6 Dec 2023, 09:24 | 13.9 | 13.9 mg/l |
| 6 Nov 2023, 12:00 | 17.8 | 17.8 mg/l |
| 9 Oct 2023, 09:58 | 0.414 | 0.414 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
below 0.01 mg/l (not detected above this)
Sampled 18 May 2026, 4 months ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 12:49 | <0.01 | below 0.01 mg/l (not detected above this) |
| 23 Apr 2026, 14:23 | 0.015 | 0.015 mg/l |
| 12 Mar 2026, 11:55 | <0.01 | below 0.01 mg/l (not detected above this) |
| 12 Feb 2026, 14:21 | <0.01 | below 0.01 mg/l (not detected above this) |
| 8 Jan 2026, 14:41 | <0.01 | below 0.01 mg/l (not detected above this) |
| 9 Dec 2025, 14:51 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Nov 2025, 13:30 | 0.034 | 0.034 mg/l |
| 24 Oct 2025, 11:43 | 0.016 | 0.016 mg/l |
| 9 Sep 2025, 15:19 | 0.067 | 0.067 mg/l |
| 15 Aug 2025, 10:45 | 0.01 | 0.01 mg/l |
| 17 Jul 2025, 13:16 | <0.01 | below 0.01 mg/l (not detected above this) |
| 10 Jun 2025, 15:03 | <0.01 | below 0.01 mg/l (not detected above this) |
| 14 May 2025, 10:56 | <0.01 | below 0.01 mg/l (not detected above this) |
| 23 Apr 2025, 11:26 | <0.01 | below 0.01 mg/l (not detected above this) |
| 6 Mar 2025, 15:40 | <0.01 | below 0.01 mg/l (not detected above this) |
| 6 Feb 2025, 12:57 | <0.01 | below 0.01 mg/l (not detected above this) |
| 22 Jan 2025, 11:55 | <0.01 | below 0.01 mg/l (not detected above this) |
| 3 Dec 2024, 09:37 | <0.01 | below 0.01 mg/l (not detected above this) |
| 18 Nov 2024, 14:24 | <0.01 | below 0.01 mg/l (not detected above this) |
| 25 Oct 2024, 15:24 | 0.01 | 0.01 mg/l |
| 16 Sep 2024, 09:29 | 0.039 | 0.039 mg/l |
| 19 Aug 2024, 14:56 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Jul 2024, 11:41 | <0.01 | below 0.01 mg/l (not detected above this) |
| 18 Jun 2024, 13:16 | <0.01 | below 0.01 mg/l (not detected above this) |
| 8 Mar 2024, 15:35 | <0.01 | below 0.01 mg/l (not detected above this) |
| 5 Feb 2024, 14:19 | <0.01 | below 0.01 mg/l (not detected above this) |
| 2 Jan 2024, 13:49 | <0.01 | below 0.01 mg/l (not detected above this) |
| 6 Dec 2023, 09:24 | <0.01 | below 0.01 mg/l (not detected above this) |
| 6 Nov 2023, 12:00 | <0.01 | below 0.01 mg/l (not detected above this) |
| 9 Oct 2023, 09:58 | <0.01 | below 0.01 mg/l (not detected above this) |
Conductivity
at 25 °C · code 0077 · µS/cm
1772 µS/cm
Sampled 14 Sep 2026, 17 days ago · 34 results banked
Every result (34)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Sep 2026, 16:04 | 1772 | 1772 µS/cm |
| 11 Aug 2026, 11:17 | 1028 | 1028 µS/cm |
| 9 Jul 2026, 11:45 | 1100 | 1100 µS/cm |
| 17 Jun 2026, 11:28 | 1148 | 1148 µS/cm |
| 18 May 2026, 12:49 | 912 | 912 µS/cm |
| 23 Apr 2026, 14:23 | 4127 | 4127 µS/cm |
| 12 Mar 2026, 11:55 | 1946 | 1946 µS/cm |
| 12 Feb 2026, 14:21 | 1825 | 1825 µS/cm |
| 8 Jan 2026, 14:41 | 2035 | 2035 µS/cm |
| 9 Dec 2025, 14:51 | 1898 | 1898 µS/cm |
| 17 Nov 2025, 13:30 | 1848 | 1848 µS/cm |
| 24 Oct 2025, 11:43 | 1579 | 1579 µS/cm |
| 9 Sep 2025, 15:19 | 1718 | 1718 µS/cm |
| 15 Aug 2025, 10:45 | 1231 | 1231 µS/cm |
| 17 Jul 2025, 13:16 | 1383 | 1383 µS/cm |
| 10 Jun 2025, 15:03 | 872 | 872 µS/cm |
| 14 May 2025, 10:56 | 1791 | 1791 µS/cm |
| 23 Apr 2025, 11:26 | 2772 | 2772 µS/cm |
| 6 Mar 2025, 15:40 | 1960 | 1960 µS/cm |
| 6 Feb 2025, 12:57 | 1939 | 1939 µS/cm |
| 22 Jan 2025, 11:55 | 1936 | 1936 µS/cm |
| 3 Dec 2024, 09:37 | 1746 | 1746 µS/cm |
| 18 Nov 2024, 14:24 | 1736 | 1736 µS/cm |
| 25 Oct 2024, 15:24 | 1809 | 1809 µS/cm |
| 16 Sep 2024, 09:29 | 1479 | 1479 µS/cm |
| 19 Aug 2024, 14:56 | 2067 | 2067 µS/cm |
| 17 Jul 2024, 11:41 | 1947 | 1947 µS/cm |
| 18 Jun 2024, 13:16 | 1320 | 1320 µS/cm |
| 8 Mar 2024, 15:35 | 1870 | 1870 µS/cm |
| 5 Feb 2024, 14:19 | 1848 | 1848 µS/cm |
| 2 Jan 2024, 13:49 | 1846 | 1846 µS/cm |
| 6 Dec 2023, 09:24 | 1925 | 1925 µS/cm |
| 6 Nov 2023, 12:00 | 1907 | 1907 µS/cm |
| 9 Oct 2023, 09:58 | 1688 | 1688 µS/cm |
Everything measured here
27 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 27 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 34 | Oct 2023 – Sep 2026 | 99.7% 14 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 34 | Oct 2023 – Sep 2026 | 9.04 mg/l 14 Sep 2026 |
| Temperature of Water 0076 | River water | 34 | Oct 2023 – Sep 2026 | 20 °C 14 Sep 2026 |
| pH 0061 | River water | 28 | Jun 2024 – Sep 2026 | 7.93 14 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 30 | Oct 2023 – May 2026 | below 0.03 mg/l 18 May 2026 |
| Nitrate as N 0117 | River water | 30 | Oct 2023 – May 2026 | 3.75 mg/l 18 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 30 | Oct 2023 – May 2026 | below 0.01 mg/l 18 May 2026 |
| Conductivity at 25 C 0077 | River water | 34 | Oct 2023 – Sep 2026 | 1772 µS/cm 14 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 24 | Jun 2024 – May 2026 | 170 mg/l 18 May 2026 |
| Alkalinity, Dissolved as CaCO3 7867 | River water | 6 | Apr 2026 – Sep 2026 | 190 mg/l 14 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 24 | Jun 2024 – May 2026 | below 0.00077 mg/l 18 May 2026 |
| Ammoniacal Nitrogen, Filtered as N 9993 | River water | 6 | Apr 2026 – Sep 2026 | below 0.03 mg/l 14 Sep 2026 |
| BOD : 5 Day ATU 0085 | River water | 30 | Oct 2023 – May 2026 | 3.5 mg/l 18 May 2026 |
| Chemical Oxygen Demand :- {COD} 0092 | River water | 5 | Oct 2023 – Mar 2024 | 45 mg/l 8 Mar 2024 |
| Chloride 0172 | River water | 6 | Oct 2023 – Mar 2024 | 86 mg/l 8 Mar 2024 |
| Chloride, GF/C Filtered 7190 | River water | 6 | Apr 2026 – Sep 2026 | 340 mg/l 14 Sep 2026 |
| Chlorophyll : Acetone Extract 7887 | River water | 6 | Oct 2023 – Mar 2024 | 1.9 µg/l 8 Mar 2024 |
| Nitrite as N 0118 | River water | 30 | Oct 2023 – May 2026 | 0.055 mg/l 18 May 2026 |
| Nitrite, Filtered as N 6485 | River water | 6 | Apr 2026 – Sep 2026 | below 0.004 mg/l 14 Sep 2026 |
| Nitrogen, Total as N 9686 | River water | 6 | Apr 2026 – Sep 2026 | 1.2 mg/l 14 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 30 | Oct 2023 – May 2026 | 3.8 mg/l 18 May 2026 |
| Nitrogen, Total Oxidised, Filtered as N 9943 | River water | 6 | Apr 2026 – Sep 2026 | below 0.2 mg/l 14 Sep 2026 |
| Orthophosphate, Filtered as P 9856 | River water | 6 | Apr 2026 – Sep 2026 | below 0.01 mg/l 14 Sep 2026 |
| Phosphorus, Total as P 0348 | River water | 12 | Oct 2023 – Sep 2026 | 0.041 mg/l 14 Sep 2026 |
| Silica, reactive as SiO2 0182 | River water | 6 | Oct 2023 – Mar 2024 | 11 mg/l 8 Mar 2024 |
| Silicate, Filtered as SiO2 9857 | River water | 6 | Apr 2026 – Sep 2026 | 4.3 mg/l 14 Sep 2026 |
| Solids, Suspended at 105 C 0135 | River water | 6 | Oct 2023 – Mar 2024 | 12 mg/l 8 Mar 2024 |
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.