Blackwater below Sandhurst sewage treatment works
EA name: BLACKWATER BELOW SANDHURST STW
Environment Agency sampling point TH-PLDR0012 · 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, 09:4248 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 36 since 2 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 481920, 161880As published, to the nearest 10 m. Open in a map
- River, by its own name
- Blackwater
- River, by the map
- Blackwater RiverPlaced on the river its name gives, 17 m from the line.
- Next gauge downstream
- Eversley On the River Blackwater · 5.5 km along the river
- Nearest gauge upstream
- Blackwater Bridge On the River Blackwater · 5.1 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (34 samples)
Monitoring (national agency policy) (2 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
74.1%
Sampled 14 Aug 2026, 48 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 09:42 | 74.1 | 74.1% |
| 10 Jul 2026, 13:16 | 78.8 | 78.8% |
| 24 Jun 2026, 08:57 | 68.8 | 68.8% |
| 14 May 2026, 08:55 | 66.5 | 66.5% |
| 10 Apr 2026, 12:55 | 105.9 | 105.9% |
| 13 Mar 2026, 12:20 | 83 | 83% |
| 10 Feb 2026, 11:41 | 81.8 | 81.8% |
| 7 Jan 2026, 12:08 | 83.4 | 83.4% |
| 11 Dec 2025, 11:45 | 86.5 | 86.5% |
| 14 Nov 2025, 09:15 | 73.2 | 73.2% |
| 9 Oct 2025, 09:56 | 78.8 | 78.8% |
| 25 Sep 2025, 09:16 | 84.5 | 84.5% |
| 14 Aug 2025, 08:47 | 77.2 | 77.2% |
| 3 Jul 2025, 13:27 | 86 | 86% |
| 4 Jun 2025, 10:26 | 74.6 | 74.6% |
| 22 May 2025, 10:20 | 82.4 | 82.4% |
| 16 Apr 2025, 11:20 | 85.3 | 85.3% |
| 12 Mar 2025, 09:19 | 85.6 | 85.6% |
| 13 Feb 2025, 13:41 | 85.5 | 85.5% |
| 20 Jan 2025, 10:58 | 84.9 | 84.9% |
| 5 Dec 2024, 09:10 | 81.1 | 81.1% |
| 11 Nov 2024, 15:24 | 82.3 | 82.3% |
| 9 Oct 2024, 12:40 | 76.6 | 76.6% |
| 11 Sep 2024, 13:44 | 80.5 | 80.5% |
| 8 Aug 2024, 11:07 | 76.7 | 76.7% |
| 15 Jul 2024, 08:53 | 78.1 | 78.1% |
| 27 Jun 2024, 09:27 | 69.9 | 69.9% |
| 6 Mar 2024, 10:23 | 81.5 | 81.5% |
| 5 Feb 2024, 09:40 | 83.7 | 83.7% |
| 10 Jan 2024, 09:57 | 81.7 | 81.7% |
| 7 Dec 2023, 09:55 | 78.5 | 78.5% |
| 7 Nov 2023, 08:56 | 78.9 | 78.9% |
| 2 Oct 2023, 08:48 | 73.7 | 73.7% |
Dissolved oxygen
as O2 · code 9924 · mg/l
6.59 mg/l
Sampled 14 Aug 2026, 48 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 09:42 | 6.59 | 6.59 mg/l |
| 10 Jul 2026, 13:16 | 6.81 | 6.81 mg/l |
| 24 Jun 2026, 08:57 | 6.03 | 6.03 mg/l |
| 14 May 2026, 08:55 | 7.18 | 7.18 mg/l |
| 10 Apr 2026, 12:55 | 11.3 | 11.3 mg/l |
| 13 Mar 2026, 12:20 | 9.26 | 9.26 mg/l |
| 10 Feb 2026, 11:41 | 9.24 | 9.24 mg/l |
| 7 Jan 2026, 12:08 | 10.3 | 10.3 mg/l |
| 11 Dec 2025, 11:45 | 9.7 | 9.7 mg/l |
| 14 Nov 2025, 09:15 | 7.52 | 7.52 mg/l |
| 9 Oct 2025, 09:56 | 8.06 | 8.06 mg/l |
| 25 Sep 2025, 09:16 | 8.84 | 8.84 mg/l |
| 14 Aug 2025, 08:47 | 7.14 | 7.14 mg/l |
| 3 Jul 2025, 13:27 | 7.85 | 7.85 mg/l |
| 4 Jun 2025, 10:26 | 7.49 | 7.49 mg/l |
| 22 May 2025, 10:20 | 8.36 | 8.36 mg/l |
| 16 Apr 2025, 11:20 | 9.26 | 9.26 mg/l |
| 12 Mar 2025, 09:19 | 9.97 | 9.97 mg/l |
| 13 Feb 2025, 13:41 | 10.2 | 10.2 mg/l |
| 20 Jan 2025, 10:58 | 10.2 | 10.2 mg/l |
| 5 Dec 2024, 09:10 | 8.9 | 8.9 mg/l |
| 11 Nov 2024, 15:24 | 8.73 | 8.73 mg/l |
| 9 Oct 2024, 12:40 | 7.72 | 7.72 mg/l |
| 11 Sep 2024, 13:44 | 7.99 | 7.99 mg/l |
| 8 Aug 2024, 11:07 | 7.27 | 7.27 mg/l |
| 15 Jul 2024, 08:53 | 7.66 | 7.66 mg/l |
| 27 Jun 2024, 09:27 | 6.57 | 6.57 mg/l |
| 6 Mar 2024, 10:23 | 9.54 | 9.54 mg/l |
| 5 Feb 2024, 09:40 | 9.32 | 9.32 mg/l |
| 10 Jan 2024, 09:57 | 10.3 | 10.3 mg/l |
| 7 Dec 2023, 09:55 | 9.15 | 9.15 mg/l |
| 7 Nov 2023, 08:56 | 8.81 | 8.81 mg/l |
| 2 Oct 2023, 08:48 | 7.06 | 7.06 mg/l |
Water temperature
code 0076 · °C
21 °C
Sampled 14 Aug 2026, 48 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 09:42 | 21 | 21 °C |
| 10 Jul 2026, 13:16 | 22.5 | 22.5 °C |
| 24 Jun 2026, 08:57 | 21.8 | 21.8 °C |
| 14 May 2026, 08:55 | 11.8 | 11.8 °C |
| 10 Apr 2026, 12:55 | 12.4 | 12.4 °C |
| 13 Mar 2026, 12:20 | 10.4 | 10.4 °C |
| 10 Feb 2026, 11:41 | 9.9 | 9.9 °C |
| 7 Jan 2026, 12:08 | 6.2 | 6.2 °C |
| 11 Dec 2025, 11:45 | 10.2 | 10.2 °C |
| 14 Nov 2025, 09:15 | 14 | 14 °C |
| 9 Oct 2025, 09:56 | 14.2 | 14.2 °C |
| 25 Sep 2025, 09:16 | 13.2 | 13.2 °C |
| 14 Aug 2025, 08:47 | 19 | 19 °C |
| 3 Jul 2025, 13:27 | 19.7 | 19.7 °C |
| 4 Jun 2025, 10:26 | 15.1 | 15.1 °C |
| 22 May 2025, 10:20 | 14.6 | 14.6 °C |
| 16 Apr 2025, 11:20 | 11.6 | 11.6 °C |
| 12 Mar 2025, 09:19 | 8.6 | 8.6 °C |
| 13 Feb 2025, 13:41 | 7.5 | 7.5 °C |
| 20 Jan 2025, 10:58 | 7.3 | 7.3 °C |
| 5 Dec 2024, 09:10 | 11.1 | 11.1 °C |
| 11 Nov 2024, 15:24 | 12.6 | 12.6 °C |
| 9 Oct 2024, 12:40 | 14.9 | 14.9 °C |
| 11 Sep 2024, 13:44 | 15.6 | 15.6 °C |
| 8 Aug 2024, 11:07 | 17.8 | 17.8 °C |
| 15 Jul 2024, 08:53 | 16.2 | 16.2 °C |
| 27 Jun 2024, 09:27 | 18.2 | 18.2 °C |
| 6 Mar 2024, 10:23 | 8.4 | 8.4 °C |
| 5 Feb 2024, 09:40 | 10.5 | 10.5 °C |
| 10 Jan 2024, 09:57 | 5.6 | 5.6 °C |
| 7 Dec 2023, 09:55 | 8.6 | 8.6 °C |
| 7 Nov 2023, 08:56 | 10.4 | 10.4 °C |
| 2 Oct 2023, 08:48 | 17.3 | 17.3 °C |
pH
code 0061
7.42
Sampled 14 Aug 2026, 48 days ago · 36 results banked
Every result (36)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 09:42 | 7.42 | 7.42 |
| 10 Jul 2026, 13:16 | 7.47 | 7.47 |
| 24 Jun 2026, 08:57 | 7.31 | 7.31 |
| 14 May 2026, 08:55 | 7.13 | 7.13 |
| 10 Apr 2026, 12:55 | 7.6 | 7.6 |
| 13 Mar 2026, 12:20 | 7.39 | 7.39 |
| 10 Feb 2026, 11:41 | 7.29 | 7.29 |
| 7 Jan 2026, 12:08 | 7.31 | 7.31 |
| 11 Dec 2025, 11:45 | 7.45 | 7.45 |
| 14 Nov 2025, 09:15 | 7.26 | 7.26 |
| 9 Oct 2025, 09:56 | 7.3 | 7.3 |
| 25 Sep 2025, 09:16 | 7.39 | 7.39 |
| 14 Aug 2025, 08:47 | 7.51 | 7.51 |
| 3 Jul 2025, 13:27 | 7.35 | 7.35 |
| 4 Jun 2025, 10:26 | 7.48 | 7.48 |
| 22 May 2025, 10:20 | 7.43 | 7.43 |
| 16 Apr 2025, 11:20 | 7.59 | 7.59 |
| 12 Mar 2025, 09:19 | 7.54 | 7.54 |
| 13 Feb 2025, 13:41 | 7.42 | 7.42 |
| 20 Jan 2025, 10:58 | 7.41 | 7.41 |
| 5 Dec 2024, 09:10 | 7.36 | 7.36 |
| 11 Nov 2024, 15:24 | 7.48 | 7.48 |
| 9 Oct 2024, 12:40 | 7.15 | 7.15 |
| 11 Sep 2024, 13:44 | 7.32 | 7.32 |
| 8 Aug 2024, 11:07 | 7.41 | 7.41 |
| 15 Jul 2024, 08:53 | 7.54 | 7.54 |
| 27 Jun 2024, 09:27 | 7.44 | 7.44 |
| 9 May 2024, 11:24 | 7.56 | 7.56 |
| 5 Apr 2024, 08:40 | 7.47 | 7.47 |
| 6 Mar 2024, 10:23 | 7.47 | 7.47 |
| 5 Feb 2024, 09:40 | 7.46 | 7.46 |
| 10 Jan 2024, 09:57 | 7.4 | 7.4 |
| 7 Dec 2023, 09:55 | 7.52 | 7.52 |
| 21 Nov 2023, 11:16 | 7.46 | 7.46 |
| 7 Nov 2023, 08:56 | 7.48 | 7.48 |
| 2 Oct 2023, 08:48 | 7.48 | 7.48 |
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 · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 09:42 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Jul 2026, 13:16 | 0.039 | 0.039 mg/l |
| 24 Jun 2026, 08:57 | 0.11 | 0.11 mg/l |
| 14 May 2026, 08:55 | 0.35 | 0.35 mg/l |
| 10 Apr 2026, 12:55 | 0.14 | 0.14 mg/l |
| 13 Mar 2026, 12:20 | 0.18 | 0.18 mg/l |
| 10 Feb 2026, 11:41 | 0.18 | 0.18 mg/l |
| 7 Jan 2026, 12:08 | 0.81 | 0.81 mg/l |
| 11 Dec 2025, 11:45 | 0.055 | 0.055 mg/l |
| 14 Nov 2025, 09:15 | 0.05 | 0.05 mg/l |
| 9 Oct 2025, 09:56 | 0.032 | 0.032 mg/l |
| 25 Sep 2025, 09:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Aug 2025, 08:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jul 2025, 13:27 | 0.046 | 0.046 mg/l |
| 4 Jun 2025, 10:26 | 0.18 | 0.18 mg/l |
| 22 May 2025, 10:20 | 0.14 | 0.14 mg/l |
| 16 Apr 2025, 11:20 | 0.15 | 0.15 mg/l |
| 12 Mar 2025, 09:19 | 0.21 | 0.21 mg/l |
| 13 Feb 2025, 13:41 | 0.15 | 0.15 mg/l |
| 20 Jan 2025, 10:58 | 0.5 | 0.5 mg/l |
| 11 Nov 2024, 15:24 | 0.039 | 0.039 mg/l |
| 9 Oct 2024, 12:40 | 0.071 | 0.071 mg/l |
| 11 Sep 2024, 13:44 | 0.048 | 0.048 mg/l |
| 8 Aug 2024, 11:07 | 0.052 | 0.052 mg/l |
| 15 Jul 2024, 08:53 | 0.054 | 0.054 mg/l |
| 27 Jun 2024, 09:27 | 0.28 | 0.28 mg/l |
| 6 Mar 2024, 10:23 | 0.29 | 0.29 mg/l |
| 5 Feb 2024, 09:40 | 0.11 | 0.11 mg/l |
| 10 Jan 2024, 09:57 | 0.53 | 0.53 mg/l |
| 7 Dec 2023, 09:55 | 0.14 | 0.14 mg/l |
| 7 Nov 2023, 08:56 | 0.27 | 0.27 mg/l |
| 2 Oct 2023, 08:48 | 0.057 | 0.057 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
18 mg/l
Sampled 14 Aug 2026, 48 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 09:42 | 18 | 18 mg/l |
| 10 Jul 2026, 13:16 | 18 | 18 mg/l |
| 24 Jun 2026, 08:57 | 15.9 | 15.9 mg/l |
| 14 May 2026, 08:55 | 14.9 | 14.9 mg/l |
| 10 Apr 2026, 12:55 | 13.9 | 13.9 mg/l |
| 13 Mar 2026, 12:20 | 8.64 | 8.64 mg/l |
| 10 Feb 2026, 11:41 | 6.15 | 6.15 mg/l |
| 7 Jan 2026, 12:08 | 7.41 | 7.41 mg/l |
| 11 Dec 2025, 11:45 | 8.96 | 8.96 mg/l |
| 14 Nov 2025, 09:15 | 9.07 | 9.07 mg/l |
| 9 Oct 2025, 09:56 | 16 | 16 mg/l |
| 25 Sep 2025, 09:16 | 16 | 16 mg/l |
| 14 Aug 2025, 08:47 | 18 | 18 mg/l |
| 3 Jul 2025, 13:27 | 17 | 17 mg/l |
| 4 Jun 2025, 10:26 | 14.9 | 14.9 mg/l |
| 22 May 2025, 10:20 | 16.9 | 16.9 mg/l |
| 16 Apr 2025, 11:20 | 11.9 | 11.9 mg/l |
| 12 Mar 2025, 09:19 | 9.95 | 9.95 mg/l |
| 13 Feb 2025, 13:41 | 9.94 | 9.94 mg/l |
| 20 Jan 2025, 10:58 | 9.92 | 9.92 mg/l |
| 11 Nov 2024, 15:24 | 12 | 12 mg/l |
| 9 Oct 2024, 12:40 | 4.67 | 4.67 mg/l |
| 11 Sep 2024, 13:44 | 9.37 | 9.37 mg/l |
| 8 Aug 2024, 11:07 | 13 | 13 mg/l |
| 15 Jul 2024, 08:53 | 8.57 | 8.57 mg/l |
| 27 Jun 2024, 09:27 | 13.8 | 13.8 mg/l |
| 6 Mar 2024, 10:23 | 6.05 | 6.05 mg/l |
| 10 Jan 2024, 09:57 | 6.21 | 6.21 mg/l |
| 7 Dec 2023, 09:55 | 6.12 | 6.12 mg/l |
| 7 Nov 2023, 08:56 | 4.33 | 4.33 mg/l |
| 2 Oct 2023, 08:48 | 9.35 | 9.35 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.12 mg/l
Sampled 10 Jul 2026, 3 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Jul 2026, 13:16 | 0.12 | 0.12 mg/l |
| 24 Jun 2026, 08:57 | 0.15 | 0.15 mg/l |
| 14 May 2026, 08:55 | 0.098 | 0.098 mg/l |
| 10 Apr 2026, 12:55 | 0.089 | 0.089 mg/l |
| 13 Mar 2026, 12:20 | 0.14 | 0.14 mg/l |
| 10 Feb 2026, 11:41 | 0.081 | 0.081 mg/l |
| 7 Jan 2026, 12:08 | 0.11 | 0.11 mg/l |
| 11 Dec 2025, 11:45 | 0.071 | 0.071 mg/l |
| 14 Nov 2025, 09:15 | 0.091 | 0.091 mg/l |
| 9 Oct 2025, 09:56 | 0.086 | 0.086 mg/l |
| 25 Sep 2025, 09:16 | 0.085 | 0.085 mg/l |
| 14 Aug 2025, 08:47 | 0.092 | 0.092 mg/l |
| 3 Jul 2025, 13:27 | 0.14 | 0.14 mg/l |
| 4 Jun 2025, 10:26 | 0.082 | 0.082 mg/l |
| 22 May 2025, 10:20 | 0.095 | 0.095 mg/l |
| 16 Apr 2025, 11:20 | 0.08 | 0.08 mg/l |
| 12 Mar 2025, 09:19 | 0.1 | 0.1 mg/l |
| 13 Feb 2025, 13:41 | 0.061 | 0.061 mg/l |
| 20 Jan 2025, 10:58 | 0.066 | 0.066 mg/l |
| 11 Nov 2024, 15:24 | 0.076 | 0.076 mg/l |
| 9 Oct 2024, 12:40 | 0.093 | 0.093 mg/l |
| 11 Sep 2024, 13:44 | 0.089 | 0.089 mg/l |
| 8 Aug 2024, 11:07 | 0.12 | 0.12 mg/l |
| 15 Jul 2024, 08:53 | 0.11 | 0.11 mg/l |
| 27 Jun 2024, 09:27 | 0.11 | 0.11 mg/l |
| 6 Mar 2024, 10:23 | 0.044 | 0.044 mg/l |
| 5 Feb 2024, 09:40 | 0.045 | 0.045 mg/l |
| 10 Jan 2024, 09:57 | 0.073 | 0.073 mg/l |
| 7 Dec 2023, 09:55 | 0.11 | 0.11 mg/l |
| 7 Nov 2023, 08:56 | 0.033 | 0.033 mg/l |
| 2 Oct 2023, 08:48 | 0.059 | 0.059 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
978 µS/cm
Sampled 14 Aug 2026, 48 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 09:42 | 978 | 978 µS/cm |
| 10 Jul 2026, 13:16 | 943 | 943 µS/cm |
| 24 Jun 2026, 08:57 | 851 | 851 µS/cm |
| 14 May 2026, 08:55 | 758 | 758 µS/cm |
| 10 Apr 2026, 12:55 | 735 | 735 µS/cm |
| 13 Mar 2026, 12:20 | 549 | 549 µS/cm |
| 10 Feb 2026, 11:41 | 538 | 538 µS/cm |
| 7 Jan 2026, 12:08 | 988 | 988 µS/cm |
| 11 Dec 2025, 11:45 | 581 | 581 µS/cm |
| 14 Nov 2025, 09:15 | 556 | 556 µS/cm |
| 9 Oct 2025, 09:56 | 841 | 841 µS/cm |
| 25 Sep 2025, 09:16 | 829 | 829 µS/cm |
| 14 Aug 2025, 08:47 | 907 | 907 µS/cm |
| 3 Jul 2025, 13:27 | 915 | 915 µS/cm |
| 4 Jun 2025, 10:26 | 820 | 820 µS/cm |
| 22 May 2025, 10:20 | 826 | 826 µS/cm |
| 16 Apr 2025, 11:20 | 716 | 716 µS/cm |
| 12 Mar 2025, 09:19 | 684 | 684 µS/cm |
| 13 Feb 2025, 13:41 | 656 | 656 µS/cm |
| 20 Jan 2025, 10:58 | 656 | 656 µS/cm |
| 5 Dec 2024, 09:10 | 626 | 626 µS/cm |
| 11 Nov 2024, 15:24 | 700 | 700 µS/cm |
| 9 Oct 2024, 12:40 | 433 | 433 µS/cm |
| 11 Sep 2024, 13:44 | 628 | 628 µS/cm |
| 8 Aug 2024, 11:07 | 728 | 728 µS/cm |
| 15 Jul 2024, 08:53 | 709 | 709 µS/cm |
| 27 Jun 2024, 09:27 | 838 | 838 µS/cm |
| 6 Mar 2024, 10:23 | 584 | 584 µS/cm |
| 5 Feb 2024, 09:40 | 685 | 685 µS/cm |
| 10 Jan 2024, 09:57 | 585 | 585 µS/cm |
| 7 Dec 2023, 09:55 | 608 | 608 µS/cm |
| 7 Nov 2023, 08:56 | 556 | 556 µS/cm |
| 2 Oct 2023, 08:48 | 798 | 798 µS/cm |
Everything measured here
78 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 78 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 33 | Oct 2023 – Aug 2026 | 74.1% 14 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 33 | Oct 2023 – Aug 2026 | 6.59 mg/l 14 Aug 2026 |
| Temperature of Water 0076 | River water | 33 | Oct 2023 – Aug 2026 | 21 °C 14 Aug 2026 |
| pH 0061 | River water | 36 | Oct 2023 – Aug 2026 | 7.42 14 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 32 | Oct 2023 – Aug 2026 | below 0.03 mg/l 14 Aug 2026 |
| Nitrate as N 0117 | River water | 31 | Oct 2023 – Aug 2026 | 18 mg/l 14 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 31 | Oct 2023 – Jul 2026 | 0.12 mg/l 10 Jul 2026 |
| Conductivity at 25 C 0077 | River water | 33 | Oct 2023 – Aug 2026 | 978 µS/cm 14 Aug 2026 |
| 10:2 Fluorotelomer sulfonic acid 2994 | River water | 1 | Jan 2026 – Jan 2026 | below 0.002 µg/l 7 Jan 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 2H-Perfluoro-2-decenoic acid 2888 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 2 | Jul 2025 – Jan 2026 | below 0.004 µg/l 7 Jan 2026 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| 5:1:2 Fluorotelomer betaine 2887 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| 6:2 Fluorotelomer phosphate diester 2986 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 7 Jan 2026 |
| 6:2 Fluorotelomer sulfonamide amine oxide (6:2 FTNO) (Capstone A) 2841 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 6:2 Fluorotelomer sulfonamide betaine 2985 | River water | 1 | Jan 2026 – Jan 2026 | 0.083 µg/l 7 Jan 2026 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 2 | Jul 2025 – Jan 2026 | 0.02 µg/l 7 Jan 2026 |
| 6:2/8:2 Fluorotelomer phosphate diester 2884 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 7 Jan 2026 |
| 6:6 Perfluorophosphinic acid 2883 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 7 Jan 2026 |
| 6:8 Perfluorophosphinic acid 2882 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 7 Jan 2026 |
| 8:2 Fluorotelomer phosphate diester 2880 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 7 Jan 2026 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 8:8 Perfluorophosphinic acid 2879 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 7 Jan 2026 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 32 | Oct 2023 – Aug 2026 | 100 mg/l 14 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 32 | Oct 2023 – Aug 2026 | below 0.00033 mg/l 14 Aug 2026 |
| BOD : 5 Day ATU 0085 | River water | 25 | Oct 2023 – Mar 2026 | below 4 mg/l 13 Mar 2026 |
| Cadmium, Dissolved 0106 | River water | 36 | Oct 2023 – Aug 2026 | 0.02 µg/l 14 Aug 2026 |
| Calcium, Dissolved 0239 | River water | 36 | Oct 2023 – Aug 2026 | 84 mg/l 14 Aug 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 36 | Oct 2023 – Aug 2026 | 5.5 mg/l 14 Aug 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| Hexafluoropropylene oxide trimer acid 2980 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| Iron, Dissolved 6460 | River water | 13 | Oct 2023 – Jul 2026 | 130 µg/l 10 Jul 2026 |
| Magnesium, Dissolved 0235 | River water | 36 | Oct 2023 – Aug 2026 | 7.3 mg/l 14 Aug 2026 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 2 | Jul 2025 – Jan 2026 | below 0.002 µg/l 7 Jan 2026 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 2 | Jul 2025 – Jan 2026 | below 0.002 µg/l 7 Jan 2026 |
| Nitrite as N 0118 | River water | 31 | Oct 2023 – Aug 2026 | 0.022 mg/l 14 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 32 | Oct 2023 – Aug 2026 | 18 mg/l 14 Aug 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluorobutanesulfonic acid 2972 | River water | 2 | Jul 2025 – Jan 2026 | 0.005 µg/l 7 Jan 2026 |
| Perfluorobutanoic acid 2995 | River water | 2 | Jul 2025 – Jan 2026 | 0.0051 µg/l 7 Jan 2026 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 2 | Jul 2025 – Jan 2026 | 0.00088 µg/l 7 Jan 2026 |
| Perfluorodecanesulfonic acid 2969 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| Perfluorodecanoic acid 8892 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| Perfluorododecane sulfonic acid 2968 | River water | 2 | Jul 2025 – Jan 2026 | below 0.005 µg/l 7 Jan 2026 |
| Perfluorododecanoic acid 8894 | River water | 2 | Jul 2025 – Jan 2026 | below 0.002 µg/l 7 Jan 2026 |
| Perfluoroheptanesulfonic acid 2967 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluoroheptanoic acid 8889 | River water | 2 | Jul 2025 – Jan 2026 | 0.0027 µg/l 7 Jan 2026 |
| Perfluorohexanesulfonamide 2965 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 2 | Jul 2025 – Jan 2026 | 0.0013 µg/l 7 Jan 2026 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 2 | Jul 2025 – Jan 2026 | 0.0066 µg/l 7 Jan 2026 |
| Perfluorohexanoic acid 8888 | River water | 2 | Jul 2025 – Jan 2026 | 0.0081 µg/l 7 Jan 2026 |
| Perfluorononanesulfonic acid 2963 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluorononanoic acid 8891 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| Perfluorooctadecanoic acid 2962 | River water | 2 | Jul 2025 – Jan 2026 | below 0.002 µg/l 7 Jan 2026 |
| Perfluorooctanesulfonamide 2961 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 2 | Jul 2025 – Jan 2026 | 0.0045 µg/l 7 Jan 2026 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 2 | Jul 2025 – Jan 2026 | 0.0081 µg/l 7 Jan 2026 |
| Perfluorooctanesulfonic acid (total) 2958 | River water | 1 | Jan 2026 – Jan 2026 | 0.013 µg/l 7 Jan 2026 |
| Perfluorooctanoic acid 8890 | River water | 2 | Jul 2025 – Jan 2026 | 0.0055 µg/l 7 Jan 2026 |
| Perfluoropentanesulfonic acid 2957 | River water | 2 | Jul 2025 – Jan 2026 | 0.00068 µg/l 7 Jan 2026 |
| Perfluoropentanoic acid 8887 | River water | 2 | Jul 2025 – Jan 2026 | 0.0078 µg/l 7 Jan 2026 |
| Perfluorotetradecanoic acid 8895 | River water | 2 | Jul 2025 – Jan 2026 | below 0.006 µg/l 7 Jan 2026 |
| Perfluorotridecanoic acid 2955 | River water | 2 | Jul 2025 – Jan 2026 | below 0.002 µg/l 7 Jan 2026 |
| Perfluoroundecane sulfonic acid 2953 | River water | 2 | Jul 2025 – Jan 2026 | below 0.004 µg/l 7 Jan 2026 |
| Perfluoroundecanoic acid 8893 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 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.