Gade above G.U.C., Rickmansworth
EA name: GADE ABOVE G.U.C., RICKMANSWORTH
Environment Agency sampling point TH-PCNR0055 · 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 Aug 2026, 08:4848 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 31 since 23 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 507300, 194300As published, to the nearest 100 m (so up to about 70 m out). Open in a map
- River, by its own name
- Gade
- River, by the map
- River GadePlaced on the river its name gives, 46 m from the line.
- Next gauge downstream
- None tracedThe map stops before any gauge.
- Nearest gauge upstream
- Croxley Green On the River Gade · 1.4 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (31 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
78%
Sampled 14 Aug 2026, 48 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 08:48 | 78 | 78% |
| 21 Jul 2026, 12:12 | 102 | 102% |
| 17 Jun 2026, 09:24 | 89.9 | 89.9% |
| 1 May 2026, 09:20 | 97.6 | 97.6% |
| 9 Apr 2026, 09:21 | 100.4 | 100.4% |
| 26 Mar 2026, 14:01 | 96.6 | 96.6% |
| 6 Feb 2026, 11:42 | 97.1 | 97.1% |
| 7 Jan 2026, 10:49 | 95.7 | 95.7% |
| 3 Dec 2025, 14:02 | 95.9 | 95.9% |
| 4 Nov 2025, 09:07 | 87.8 | 87.8% |
| 17 Oct 2025, 10:08 | 86.1 | 86.1% |
| 5 Sep 2025, 09:26 | 87.3 | 87.3% |
| 12 Aug 2025, 09:36 | 89.4 | 89.4% |
| 1 Jul 2025, 13:48 | 101.7 | 101.7% |
| 16 Jun 2025, 09:37 | 95.5 | 95.5% |
| 22 May 2025, 11:45 | 103.2 | 103.2% |
| 30 Apr 2025, 15:22 | 105.8 | 105.8% |
| 7 Mar 2025, 09:53 | 104.3 | 104.3% |
| 12 Feb 2025, 10:44 | 97.2 | 97.2% |
| 22 Jan 2025, 13:43 | 97.9 | 97.9% |
| 3 Dec 2024, 13:47 | 96.2 | 96.2% |
| 18 Nov 2024, 09:50 | 94.1 | 94.1% |
| 16 Oct 2024, 11:02 | 93.9 | 93.9% |
| 24 Sep 2024, 12:44 | 89.2 | 89.2% |
| 19 Aug 2024, 09:32 | 83.9 | 83.9% |
| 23 Jul 2024, 08:55 | 75.9 | 75.9% |
| 27 Mar 2024, 10:47 | 97.4 | 97.4% |
| 23 Feb 2024, 09:03 | 92.4 | 92.4% |
| 2 Feb 2024, 11:00 | 98.8 | 98.8% |
| 8 Dec 2023, 11:19 | 92 | 92% |
| 23 Oct 2023, 10:59 | 80.4 | 80.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
7.16 mg/l
Sampled 14 Aug 2026, 48 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 08:48 | 7.16 | 7.16 mg/l |
| 21 Jul 2026, 12:12 | 9.5 | 9.5 mg/l |
| 17 Jun 2026, 09:24 | 8.56 | 8.56 mg/l |
| 1 May 2026, 09:20 | 10.4 | 10.4 mg/l |
| 9 Apr 2026, 09:21 | 10.6 | 10.6 mg/l |
| 26 Mar 2026, 14:01 | 10.5 | 10.5 mg/l |
| 6 Feb 2026, 11:42 | 11.2 | 11.2 mg/l |
| 7 Jan 2026, 10:49 | 12.7 | 12.7 mg/l |
| 3 Dec 2025, 14:02 | 11.3 | 11.3 mg/l |
| 4 Nov 2025, 09:07 | 9.4 | 9.4 mg/l |
| 17 Oct 2025, 10:08 | 9.17 | 9.17 mg/l |
| 5 Sep 2025, 09:26 | 8.8 | 8.8 mg/l |
| 12 Aug 2025, 09:36 | 8.44 | 8.44 mg/l |
| 1 Jul 2025, 13:48 | 8.74 | 8.74 mg/l |
| 16 Jun 2025, 09:37 | 9.13 | 9.13 mg/l |
| 22 May 2025, 11:45 | 10.6 | 10.6 mg/l |
| 30 Apr 2025, 15:22 | 10.3 | 10.3 mg/l |
| 7 Mar 2025, 09:53 | 12 | 12 mg/l |
| 12 Feb 2025, 10:44 | 11.7 | 11.7 mg/l |
| 22 Jan 2025, 13:43 | 11.8 | 11.8 mg/l |
| 3 Dec 2024, 13:47 | 11 | 11 mg/l |
| 18 Nov 2024, 09:50 | 10.7 | 10.7 mg/l |
| 16 Oct 2024, 11:02 | 9.96 | 9.96 mg/l |
| 24 Sep 2024, 12:44 | 8.89 | 8.89 mg/l |
| 19 Aug 2024, 09:32 | 8.33 | 8.33 mg/l |
| 23 Jul 2024, 08:55 | 7.26 | 7.26 mg/l |
| 27 Mar 2024, 10:47 | 11 | 11 mg/l |
| 23 Feb 2024, 09:03 | 10.9 | 10.9 mg/l |
| 2 Feb 2024, 11:00 | 11.6 | 11.6 mg/l |
| 8 Dec 2023, 11:19 | 11 | 11 mg/l |
| 23 Oct 2023, 10:59 | 8.83 | 8.83 mg/l |
Water temperature
code 0076 · °C
19.4 °C
Sampled 14 Aug 2026, 48 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 08:48 | 19.4 | 19.4 °C |
| 21 Jul 2026, 12:12 | 18.7 | 18.7 °C |
| 17 Jun 2026, 09:24 | 17.6 | 17.6 °C |
| 1 May 2026, 09:20 | 12.4 | 12.4 °C |
| 9 Apr 2026, 09:21 | 12.8 | 12.8 °C |
| 26 Mar 2026, 14:01 | 11.5 | 11.5 °C |
| 6 Feb 2026, 11:42 | 9 | 9 °C |
| 7 Jan 2026, 10:49 | 3.4 | 3.4 °C |
| 3 Dec 2025, 14:02 | 8.3 | 8.3 °C |
| 4 Nov 2025, 09:07 | 12.2 | 12.2 °C |
| 17 Oct 2025, 10:08 | 12.4 | 12.4 °C |
| 5 Sep 2025, 09:26 | 14.9 | 14.9 °C |
| 12 Aug 2025, 09:36 | 18 | 18 °C |
| 1 Jul 2025, 13:48 | 22.8 | 22.8 °C |
| 16 Jun 2025, 09:37 | 17.4 | 17.4 °C |
| 22 May 2025, 11:45 | 14.1 | 14.1 °C |
| 30 Apr 2025, 15:22 | 16.6 | 16.6 °C |
| 7 Mar 2025, 09:53 | 9.1 | 9.1 °C |
| 12 Feb 2025, 10:44 | 7.3 | 7.3 °C |
| 22 Jan 2025, 13:43 | 7.2 | 7.2 °C |
| 3 Dec 2024, 13:47 | 9.5 | 9.5 °C |
| 18 Nov 2024, 09:50 | 9.8 | 9.8 °C |
| 16 Oct 2024, 11:02 | 12.6 | 12.6 °C |
| 24 Sep 2024, 12:44 | 15.4 | 15.4 °C |
| 19 Aug 2024, 09:32 | 15.6 | 15.6 °C |
| 23 Jul 2024, 08:55 | 17.4 | 17.4 °C |
| 27 Mar 2024, 10:47 | 9.9 | 9.9 °C |
| 23 Feb 2024, 09:03 | 8 | 8 °C |
| 2 Feb 2024, 11:00 | 8.3 | 8.3 °C |
| 8 Dec 2023, 11:19 | 7.4 | 7.4 °C |
| 23 Oct 2023, 10:59 | 11.1 | 11.1 °C |
pH
code 0061
7.83
Sampled 14 Aug 2026, 48 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 08:48 | 7.83 | 7.83 |
| 21 Jul 2026, 12:12 | 7.81 | 7.81 |
| 17 Jun 2026, 09:24 | 7.89 | 7.89 |
| 1 May 2026, 09:20 | 7.99 | 7.99 |
| 9 Apr 2026, 09:21 | 7.94 | 7.94 |
| 26 Mar 2026, 14:01 | 7.99 | 7.99 |
| 6 Feb 2026, 11:42 | 8.18 | 8.18 |
| 7 Jan 2026, 10:49 | 8.05 | 8.05 |
| 3 Dec 2025, 14:02 | 7.95 | 7.95 |
| 4 Nov 2025, 09:07 | 7.89 | 7.89 |
| 17 Oct 2025, 10:08 | 7.85 | 7.85 |
| 5 Sep 2025, 09:26 | 7.87 | 7.87 |
| 12 Aug 2025, 09:36 | 7.73 | 7.73 |
| 1 Jul 2025, 13:48 | 7.98 | 7.98 |
| 16 Jun 2025, 09:37 | 7.94 | 7.94 |
| 22 May 2025, 11:45 | 8.02 | 8.02 |
| 30 Apr 2025, 15:22 | 8.09 | 8.09 |
| 7 Mar 2025, 09:53 | 8.1 | 8.1 |
| 12 Feb 2025, 10:44 | 7.99 | 7.99 |
| 22 Jan 2025, 13:43 | 8.04 | 8.04 |
| 3 Dec 2024, 13:47 | 7.88 | 7.88 |
| 18 Nov 2024, 09:50 | 7.94 | 7.94 |
| 16 Oct 2024, 11:02 | 7.83 | 7.83 |
| 24 Sep 2024, 12:44 | 7.7 | 7.7 |
| 19 Aug 2024, 09:32 | 7.98 | 7.98 |
| 23 Jul 2024, 08:55 | 7.82 | 7.82 |
| 27 Mar 2024, 10:47 | 7.79 | 7.79 |
| 23 Feb 2024, 09:03 | 7.8 | 7.8 |
| 2 Feb 2024, 11:00 | 8.16 | 8.16 |
| 8 Dec 2023, 11:19 | 7.92 | 7.92 |
| 23 Oct 2023, 10:59 | 7.75 | 7.75 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 14 Aug 2026, 48 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 08:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Jul 2026, 12:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jun 2026, 09:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 May 2026, 09:20 | 0.035 | 0.035 mg/l |
| 9 Apr 2026, 09:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Mar 2026, 14:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Feb 2026, 11:42 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Jan 2026, 10:49 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Dec 2025, 14:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Nov 2025, 09:07 | 0.059 | 0.059 mg/l |
| 17 Oct 2025, 10:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Sep 2025, 09:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Aug 2025, 09:36 | 0.049 | 0.049 mg/l |
| 1 Jul 2025, 13:48 | 0.031 | 0.031 mg/l |
| 16 Jun 2025, 09:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 May 2025, 11:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Apr 2025, 15:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Mar 2025, 09:53 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Feb 2025, 10:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Jan 2025, 13:43 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Dec 2024, 13:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Nov 2024, 09:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Oct 2024, 11:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Sep 2024, 12:44 | 0.047 | 0.047 mg/l |
| 19 Aug 2024, 09:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Jul 2024, 08:55 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 Mar 2024, 10:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Feb 2024, 09:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Feb 2024, 11:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Dec 2023, 11:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Oct 2023, 10:59 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
4.19 mg/l
Sampled 14 Aug 2026, 48 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 08:48 | 4.19 | 4.19 mg/l |
| 21 Jul 2026, 12:12 | 4.59 | 4.59 mg/l |
| 17 Jun 2026, 09:24 | 4.69 | 4.69 mg/l |
| 1 May 2026, 09:20 | 5.58 | 5.58 mg/l |
| 9 Apr 2026, 09:21 | 5.39 | 5.39 mg/l |
| 26 Mar 2026, 14:01 | 11 | 11 mg/l |
| 6 Feb 2026, 11:42 | 5.58 | 5.58 mg/l |
| 7 Jan 2026, 10:49 | 6.48 | 6.48 mg/l |
| 3 Dec 2025, 14:02 | 5.79 | 5.79 mg/l |
| 4 Nov 2025, 09:07 | 5.38 | 5.38 mg/l |
| 17 Oct 2025, 10:08 | 5.69 | 5.69 mg/l |
| 5 Sep 2025, 09:26 | 4.39 | 4.39 mg/l |
| 12 Aug 2025, 09:36 | 4.49 | 4.49 mg/l |
| 1 Jul 2025, 13:48 | 4.58 | 4.58 mg/l |
| 16 Jun 2025, 09:37 | 4.79 | 4.79 mg/l |
| 22 May 2025, 11:45 | 5.19 | 5.19 mg/l |
| 30 Apr 2025, 15:22 | 5.49 | 5.49 mg/l |
| 7 Mar 2025, 09:53 | 6.19 | 6.19 mg/l |
| 12 Feb 2025, 10:44 | 6.28 | 6.28 mg/l |
| 22 Jan 2025, 13:43 | 6.39 | 6.39 mg/l |
| 3 Dec 2024, 13:47 | 5.69 | 5.69 mg/l |
| 18 Nov 2024, 09:50 | 5.99 | 5.99 mg/l |
| 16 Oct 2024, 11:02 | 5.09 | 5.09 mg/l |
| 24 Sep 2024, 12:44 | 3.68 | 3.68 mg/l |
| 19 Aug 2024, 09:32 | 4.29 | 4.29 mg/l |
| 23 Jul 2024, 08:55 | 3.98 | 3.98 mg/l |
| 27 Mar 2024, 10:47 | 5.59 | 5.59 mg/l |
| 23 Feb 2024, 09:03 | 4.78 | 4.78 mg/l |
| 2 Feb 2024, 11:00 | 5.99 | 5.99 mg/l |
| 8 Dec 2023, 11:19 | 5.39 | 5.39 mg/l |
| 23 Oct 2023, 10:59 | 3.79 | 3.79 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.036 mg/l
Sampled 14 Aug 2026, 48 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 08:48 | 0.036 | 0.036 mg/l |
| 21 Jul 2026, 12:12 | 0.031 | 0.031 mg/l |
| 17 Jun 2026, 09:24 | 0.055 | 0.055 mg/l |
| 1 May 2026, 09:20 | 0.037 | 0.037 mg/l |
| 9 Apr 2026, 09:21 | <0.01 | below 0.01 mg/l (not detected above this) |
| 26 Mar 2026, 14:01 | 0.18 | 0.18 mg/l |
| 6 Feb 2026, 11:42 | 0.056 | 0.056 mg/l |
| 7 Jan 2026, 10:49 | 0.058 | 0.058 mg/l |
| 3 Dec 2025, 14:02 | 0.053 | 0.053 mg/l |
| 4 Nov 2025, 09:07 | 0.056 | 0.056 mg/l |
| 17 Oct 2025, 10:08 | 0.057 | 0.057 mg/l |
| 5 Sep 2025, 09:26 | 0.051 | 0.051 mg/l |
| 12 Aug 2025, 09:36 | 0.026 | 0.026 mg/l |
| 1 Jul 2025, 13:48 | 0.058 | 0.058 mg/l |
| 16 Jun 2025, 09:37 | 0.051 | 0.051 mg/l |
| 22 May 2025, 11:45 | 0.044 | 0.044 mg/l |
| 30 Apr 2025, 15:22 | 0.033 | 0.033 mg/l |
| 7 Mar 2025, 09:53 | 0.066 | 0.066 mg/l |
| 12 Feb 2025, 10:44 | 0.059 | 0.059 mg/l |
| 22 Jan 2025, 13:43 | 0.082 | 0.082 mg/l |
| 3 Dec 2024, 13:47 | 0.064 | 0.064 mg/l |
| 18 Nov 2024, 09:50 | 0.062 | 0.062 mg/l |
| 16 Oct 2024, 11:02 | 0.095 | 0.095 mg/l |
| 24 Sep 2024, 12:44 | 0.1 | 0.1 mg/l |
| 19 Aug 2024, 09:32 | 0.094 | 0.094 mg/l |
| 23 Jul 2024, 08:55 | 0.096 | 0.096 mg/l |
| 27 Mar 2024, 10:47 | 0.063 | 0.063 mg/l |
| 23 Feb 2024, 09:03 | 0.088 | 0.088 mg/l |
| 2 Feb 2024, 11:00 | 0.11 | 0.11 mg/l |
| 8 Dec 2023, 11:19 | 0.15 | 0.15 mg/l |
| 23 Oct 2023, 10:59 | 0.1 | 0.1 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
640 µS/cm
Sampled 14 Aug 2026, 48 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 08:48 | 640 | 640 µS/cm |
| 21 Jul 2026, 12:12 | 622 | 622 µS/cm |
| 17 Jun 2026, 09:24 | 628 | 628 µS/cm |
| 1 May 2026, 09:20 | 642 | 642 µS/cm |
| 9 Apr 2026, 09:21 | 644 | 644 µS/cm |
| 26 Mar 2026, 14:01 | 826 | 826 µS/cm |
| 6 Feb 2026, 11:42 | 604 | 604 µS/cm |
| 7 Jan 2026, 10:49 | 719 | 719 µS/cm |
| 3 Dec 2025, 14:02 | 662 | 662 µS/cm |
| 4 Nov 2025, 09:07 | 642 | 642 µS/cm |
| 17 Oct 2025, 10:08 | 656 | 656 µS/cm |
| 5 Sep 2025, 09:26 | 561 | 561 µS/cm |
| 12 Aug 2025, 09:36 | 619 | 619 µS/cm |
| 1 Jul 2025, 13:48 | 640 | 640 µS/cm |
| 16 Jun 2025, 09:37 | 628 | 628 µS/cm |
| 22 May 2025, 11:45 | 635 | 635 µS/cm |
| 30 Apr 2025, 15:22 | 653 | 653 µS/cm |
| 7 Mar 2025, 09:53 | 662 | 662 µS/cm |
| 12 Feb 2025, 10:44 | 666 | 666 µS/cm |
| 22 Jan 2025, 13:43 | 661 | 661 µS/cm |
| 3 Dec 2024, 13:47 | 667 | 667 µS/cm |
| 18 Nov 2024, 09:50 | 649 | 649 µS/cm |
| 16 Oct 2024, 11:02 | 597 | 597 µS/cm |
| 24 Sep 2024, 12:44 | 476 | 476 µS/cm |
| 19 Aug 2024, 09:32 | 649 | 649 µS/cm |
| 23 Jul 2024, 08:55 | 663 | 663 µS/cm |
| 27 Mar 2024, 10:47 | 643 | 643 µS/cm |
| 23 Feb 2024, 09:03 | 584 | 584 µS/cm |
| 2 Feb 2024, 11:00 | 669 | 669 µS/cm |
| 8 Dec 2023, 11:19 | 691 | 691 µS/cm |
| 23 Oct 2023, 10:59 | 572 | 572 µS/cm |
Everything measured here
65 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 65 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 31 | Oct 2023 – Aug 2026 | 78% 14 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 31 | Oct 2023 – Aug 2026 | 7.16 mg/l 14 Aug 2026 |
| Temperature of Water 0076 | River water | 31 | Oct 2023 – Aug 2026 | 19.4 °C 14 Aug 2026 |
| pH 0061 | River water | 31 | Oct 2023 – Aug 2026 | 7.83 14 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 31 | Oct 2023 – Aug 2026 | below 0.03 mg/l 14 Aug 2026 |
| Nitrate as N 0117 | River water | 31 | Oct 2023 – Aug 2026 | 4.19 mg/l 14 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 31 | Oct 2023 – Aug 2026 | 0.036 mg/l 14 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 31 | Oct 2023 – Aug 2026 | 640 µS/cm 14 Aug 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 2 | Oct 2023 – Feb 2024 | below 0.001 µg/l 23 Feb 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 2 | Oct 2023 – Feb 2024 | below 0.001 µg/l 23 Feb 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 2 | Oct 2023 – Feb 2024 | below 0.001 µg/l 23 Feb 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 2 | Oct 2023 – Feb 2024 | below 0.002 µg/l 23 Feb 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 2 | Oct 2023 – Feb 2024 | below 0.0005 µg/l 23 Feb 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 2 | Oct 2023 – Feb 2024 | below 0.001 µg/l 23 Feb 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 2 | Oct 2023 – Feb 2024 | below 0.0005 µg/l 23 Feb 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 2 | Oct 2023 – Feb 2024 | below 0.004 µg/l 23 Feb 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Feb 2024 – Feb 2024 | below 0.005 µg/l 23 Feb 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 2 | Oct 2023 – Feb 2024 | below 0.0005 µg/l 23 Feb 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 2 | Oct 2023 – Feb 2024 | below 0.001 µg/l 23 Feb 2024 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 2 | Oct 2023 – Feb 2024 | below 0.001 µg/l 23 Feb 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 2 | Oct 2023 – Feb 2024 | below 0.0005 µg/l 23 Feb 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 31 | Oct 2023 – Aug 2026 | 250 mg/l 14 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 31 | Oct 2023 – Aug 2026 | below 0.00074 mg/l 14 Aug 2026 |
| BOD : 5 Day ATU 0085 | River water | 31 | Oct 2023 – Aug 2026 | below 3 mg/l 14 Aug 2026 |
| Cadmium, Dissolved 0106 | River water | 2 | Oct 2023 – Feb 2024 | below 0.01 µg/l 23 Feb 2024 |
| Calcium, Dissolved 0239 | River water | 2 | Oct 2023 – Feb 2024 | 100 mg/l 23 Feb 2024 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 2 | Oct 2023 – Feb 2024 | 1.9 mg/l 23 Feb 2024 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 2 | Oct 2023 – Feb 2024 | below 0.001 µg/l 23 Feb 2024 |
| Magnesium, Dissolved 0235 | River water | 2 | Oct 2023 – Feb 2024 | 2 mg/l 23 Feb 2024 |
| Mercury, Dissolved 0103 | River water | 2 | Oct 2023 – Feb 2024 | below 0.01 µg/l 23 Feb 2024 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 2 | Oct 2023 – Feb 2024 | below 0.002 µg/l 23 Feb 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 2 | Oct 2023 – Feb 2024 | below 0.002 µg/l 23 Feb 2024 |
| Nitrite as N 0118 | River water | 31 | Oct 2023 – Aug 2026 | 0.014 mg/l 14 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 31 | Oct 2023 – Aug 2026 | 4.2 mg/l 14 Aug 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 2 | Oct 2023 – Feb 2024 | below 0.0005 µg/l 23 Feb 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 2 | Oct 2023 – Feb 2024 | below 0.0005 µg/l 23 Feb 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 2 | Oct 2023 – Feb 2024 | below 0.0005 µg/l 23 Feb 2024 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 1 | Feb 2024 – Feb 2024 | below 0.0005 µg/l 23 Feb 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 2 | Oct 2023 – Feb 2024 | below 0.0005 µg/l 23 Feb 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 2 | Oct 2023 – Feb 2024 | below 0.001 µg/l 23 Feb 2024 |
| Perfluorobutanoic acid 2995 | River water | 2 | Oct 2023 – Feb 2024 | 0.0012 µg/l 23 Feb 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 2 | Oct 2023 – Feb 2024 | below 0.0005 µg/l 23 Feb 2024 |
| Perfluorodecanesulfonic acid 2969 | River water | 2 | Oct 2023 – Feb 2024 | below 0.002 µg/l 23 Feb 2024 |
| Perfluorodecanoic acid 8892 | River water | 2 | Oct 2023 – Feb 2024 | below 0.002 µg/l 23 Feb 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 2 | Oct 2023 – Feb 2024 | below 0.005 µg/l 23 Feb 2024 |
| Perfluorododecanoic acid 8894 | River water | 2 | Oct 2023 – Feb 2024 | below 0.002 µg/l 23 Feb 2024 |
| Perfluoroheptanesulfonic acid 2967 | River water | 2 | Oct 2023 – Feb 2024 | below 0.0005 µg/l 23 Feb 2024 |
| Perfluoroheptanoic acid 8889 | River water | 2 | Oct 2023 – Feb 2024 | below 0.001 µg/l 23 Feb 2024 |
| Perfluorohexanesulfonamide 2965 | River water | 2 | Oct 2023 – Feb 2024 | below 0.0005 µg/l 23 Feb 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 2 | Oct 2023 – Feb 2024 | below 0.0005 µg/l 23 Feb 2024 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 2 | Oct 2023 – Feb 2024 | 0.0011 µg/l 23 Feb 2024 |
| Perfluorohexanoic acid 8888 | River water | 2 | Oct 2023 – Feb 2024 | 0.00093 µg/l 23 Feb 2024 |
| Perfluorononanesulfonic acid 2963 | River water | 2 | Oct 2023 – Feb 2024 | below 0.0005 µg/l 23 Feb 2024 |
| Perfluorononanoic acid 8891 | River water | 2 | Oct 2023 – Feb 2024 | below 0.001 µg/l 23 Feb 2024 |
| Perfluorooctadecanoic acid 2962 | River water | 2 | Oct 2023 – Feb 2024 | below 0.002 µg/l 23 Feb 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 2 | Oct 2023 – Feb 2024 | below 0.001 µg/l 23 Feb 2024 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 2 | Oct 2023 – Feb 2024 | 0.0015 µg/l 23 Feb 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 2 | Oct 2023 – Feb 2024 | below 0.002 µg/l 23 Feb 2024 |
| Perfluorooctanoic acid 8890 | River water | 2 | Oct 2023 – Feb 2024 | 0.00097 µg/l 23 Feb 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 2 | Oct 2023 – Feb 2024 | below 0.0005 µg/l 23 Feb 2024 |
| Perfluoropentanoic acid 8887 | River water | 2 | Oct 2023 – Feb 2024 | below 0.001 µg/l 23 Feb 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 2 | Oct 2023 – Feb 2024 | below 0.006 µg/l 23 Feb 2024 |
| Perfluorotridecanoic acid 2955 | River water | 2 | Oct 2023 – Feb 2024 | below 0.005 µg/l 23 Feb 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 2 | Oct 2023 – Feb 2024 | below 0.004 µg/l 23 Feb 2024 |
| Perfluoroundecanoic acid 8893 | River water | 2 | Oct 2023 – Feb 2024 | below 0.002 µg/l 23 Feb 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.