Hart at Lea Bridge, Hazeley
EA name: HART AT LEA BRIDGE, HAZELEY
Environment Agency sampling point TH-PLDR0020 · 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
- 10 Jul 2026, 16:193 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 32 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 474830, 159900As published, to the nearest 10 m. Open in a map
- River, by its own name
- Hart
- River, by the map
- River HartPlaced on the river its name gives, 2 m from the line.
- Next gauge downstream
- Swallowfield On the River Blackwater · 6.9 km along the riverSwallowfield Side Channel On the River Blackwater · 6.9 km along the river
- Nearest gauge upstream
- Bramshill On the River Hart · 1.2 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (32 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
92.5%
Sampled 10 Jul 2026, 3 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Jul 2026, 16:19 | 92.5 | 92.5% |
| 26 Jun 2026, 09:26 | 68.7 | 68.7% |
| 15 May 2026, 09:23 | 82.6 | 82.6% |
| 20 Apr 2026, 11:21 | 98.2 | 98.2% |
| 26 Mar 2026, 09:29 | 89.1 | 89.1% |
| 4 Feb 2026, 10:05 | 86.8 | 86.8% |
| 21 Jan 2026, 11:43 | 87.7 | 87.7% |
| 10 Dec 2025, 12:40 | 85.2 | 85.2% |
| 13 Nov 2025, 09:27 | 78.3 | 78.3% |
| 8 Oct 2025, 09:49 | 73 | 73% |
| 5 Sep 2025, 12:32 | 86.4 | 86.4% |
| 1 Aug 2025, 10:03 | 62.2 | 62.2% |
| 17 Jul 2025, 08:53 | 61.3 | 61.3% |
| 12 Jun 2025, 10:59 | 80.4 | 80.4% |
| 29 May 2025, 10:20 | 84.9 | 84.9% |
| 23 Apr 2025, 12:57 | 72 | 72% |
| 5 Mar 2025, 13:02 | 92.1 | 92.1% |
| 12 Feb 2025, 10:10 | 88.3 | 88.3% |
| 23 Jan 2025, 12:48 | 90 | 90% |
| 13 Dec 2024, 12:58 | 89.2 | 89.2% |
| 27 Nov 2024, 10:32 | 83.5 | 83.5% |
| 25 Oct 2024, 09:20 | 77.7 | 77.7% |
| 19 Sep 2024, 11:20 | 88 | 88% |
| 21 Aug 2024, 11:38 | 86.8 | 86.8% |
| 15 Jul 2024, 11:51 | 85.8 | 85.8% |
| 17 Jun 2024, 12:43 | 98.8 | 98.8% |
| 1 Mar 2024, 10:08 | 86.4 | 86.4% |
| 2 Feb 2024, 11:27 | 91.3 | 91.3% |
| 10 Jan 2024, 09:21 | 86.2 | 86.2% |
| 5 Dec 2023, 09:34 | 81.5 | 81.5% |
| 10 Nov 2023, 09:59 | 80.4 | 80.4% |
| 2 Oct 2023, 13:30 | 78.3 | 78.3% |
Dissolved oxygen
as O2 · code 9924 · mg/l
7.84 mg/l
Sampled 10 Jul 2026, 3 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Jul 2026, 16:19 | 7.84 | 7.84 mg/l |
| 26 Jun 2026, 09:26 | 5.95 | 5.95 mg/l |
| 15 May 2026, 09:23 | 9.24 | 9.24 mg/l |
| 20 Apr 2026, 11:21 | 10.7 | 10.7 mg/l |
| 26 Mar 2026, 09:29 | 10.5 | 10.5 mg/l |
| 4 Feb 2026, 10:05 | 10.6 | 10.6 mg/l |
| 21 Jan 2026, 11:43 | 10.4 | 10.4 mg/l |
| 10 Dec 2025, 12:40 | 9.42 | 9.42 mg/l |
| 13 Nov 2025, 09:27 | 8.21 | 8.21 mg/l |
| 8 Oct 2025, 09:49 | 7.55 | 7.55 mg/l |
| 5 Sep 2025, 12:32 | 8.45 | 8.45 mg/l |
| 1 Aug 2025, 10:03 | 6 | 6 mg/l |
| 17 Jul 2025, 08:53 | 5.79 | 5.79 mg/l |
| 12 Jun 2025, 10:59 | 7.91 | 7.91 mg/l |
| 29 May 2025, 10:20 | 8.43 | 8.43 mg/l |
| 23 Apr 2025, 12:57 | 7.78 | 7.78 mg/l |
| 5 Mar 2025, 13:02 | 11 | 11 mg/l |
| 12 Feb 2025, 10:10 | 10.9 | 10.9 mg/l |
| 23 Jan 2025, 12:48 | 11 | 11 mg/l |
| 13 Dec 2024, 12:58 | 10.5 | 10.5 mg/l |
| 27 Nov 2024, 10:32 | 9.73 | 9.73 mg/l |
| 25 Oct 2024, 09:20 | 8.13 | 8.13 mg/l |
| 19 Sep 2024, 11:20 | 8.64 | 8.64 mg/l |
| 21 Aug 2024, 11:38 | 8.58 | 8.58 mg/l |
| 15 Jul 2024, 11:51 | 8.59 | 8.59 mg/l |
| 17 Jun 2024, 12:43 | 9.77 | 9.77 mg/l |
| 1 Mar 2024, 10:08 | 10.3 | 10.3 mg/l |
| 2 Feb 2024, 11:27 | 10.7 | 10.7 mg/l |
| 10 Jan 2024, 09:21 | 11.3 | 11.3 mg/l |
| 5 Dec 2023, 09:34 | 9.76 | 9.76 mg/l |
| 10 Nov 2023, 09:59 | 9.12 | 9.12 mg/l |
| 2 Oct 2023, 13:30 | 7.6 | 7.6 mg/l |
Water temperature
code 0076 · °C
23.5 °C
Sampled 10 Jul 2026, 3 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Jul 2026, 16:19 | 23.5 | 23.5 °C |
| 26 Jun 2026, 09:26 | 22.4 | 22.4 °C |
| 15 May 2026, 09:23 | 10.3 | 10.3 °C |
| 20 Apr 2026, 11:21 | 11.6 | 11.6 °C |
| 26 Mar 2026, 09:29 | 8.1 | 8.1 °C |
| 4 Feb 2026, 10:05 | 6.8 | 6.8 °C |
| 21 Jan 2026, 11:43 | 7.8 | 7.8 °C |
| 10 Dec 2025, 12:40 | 10.8 | 10.8 °C |
| 13 Nov 2025, 09:27 | 13.1 | 13.1 °C |
| 8 Oct 2025, 09:49 | 13.7 | 13.7 °C |
| 5 Sep 2025, 12:32 | 16.3 | 16.3 °C |
| 1 Aug 2025, 10:03 | 17 | 17 °C |
| 17 Jul 2025, 08:53 | 18 | 18 °C |
| 12 Jun 2025, 10:59 | 16 | 16 °C |
| 29 May 2025, 10:20 | 15.6 | 15.6 °C |
| 23 Apr 2025, 12:57 | 11.8 | 11.8 °C |
| 5 Mar 2025, 13:02 | 7.5 | 7.5 °C |
| 12 Feb 2025, 10:10 | 6.2 | 6.2 °C |
| 23 Jan 2025, 12:48 | 6.7 | 6.7 °C |
| 13 Dec 2024, 12:58 | 8.2 | 8.2 °C |
| 27 Nov 2024, 10:32 | 8.6 | 8.6 °C |
| 25 Oct 2024, 09:20 | 13.2 | 13.2 °C |
| 19 Sep 2024, 11:20 | 16.1 | 16.1 °C |
| 21 Aug 2024, 11:38 | 15.8 | 15.8 °C |
| 15 Jul 2024, 11:51 | 15.2 | 15.2 °C |
| 17 Jun 2024, 12:43 | 15.8 | 15.8 °C |
| 1 Mar 2024, 10:08 | 7.5 | 7.5 °C |
| 2 Feb 2024, 11:27 | 8.5 | 8.5 °C |
| 10 Jan 2024, 09:21 | 4 | 4 °C |
| 5 Dec 2023, 09:34 | 7.5 | 7.5 °C |
| 10 Nov 2023, 09:59 | 9.7 | 9.7 °C |
| 2 Oct 2023, 13:30 | 16.7 | 16.7 °C |
pH
code 0061
7.42
Sampled 10 Jul 2026, 3 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Jul 2026, 16:19 | 7.42 | 7.42 |
| 26 Jun 2026, 09:26 | 7.24 | 7.24 |
| 15 May 2026, 09:23 | 7.33 | 7.33 |
| 20 Apr 2026, 11:21 | 7.68 | 7.68 |
| 26 Mar 2026, 09:29 | 7.62 | 7.62 |
| 4 Feb 2026, 10:05 | 7.36 | 7.36 |
| 21 Jan 2026, 11:43 | 7.48 | 7.48 |
| 10 Dec 2025, 12:40 | 7.36 | 7.36 |
| 13 Nov 2025, 09:27 | 7.25 | 7.25 |
| 8 Oct 2025, 09:49 | 7.11 | 7.11 |
| 5 Sep 2025, 12:32 | 7.45 | 7.45 |
| 1 Aug 2025, 10:03 | 7.26 | 7.26 |
| 17 Jul 2025, 08:53 | 7.28 | 7.28 |
| 12 Jun 2025, 10:59 | 7.51 | 7.51 |
| 29 May 2025, 10:20 | 7.57 | 7.57 |
| 23 Apr 2025, 12:57 | 7.39 | 7.39 |
| 5 Mar 2025, 13:02 | 7.63 | 7.63 |
| 12 Feb 2025, 10:10 | 7.54 | 7.54 |
| 23 Jan 2025, 12:48 | 7.52 | 7.52 |
| 13 Dec 2024, 12:58 | 7.51 | 7.51 |
| 27 Nov 2024, 10:32 | 7.53 | 7.53 |
| 25 Oct 2024, 09:20 | 7.48 | 7.48 |
| 19 Sep 2024, 11:20 | 7.16 | 7.16 |
| 21 Aug 2024, 11:38 | 7.47 | 7.47 |
| 15 Jul 2024, 11:51 | 7.53 | 7.53 |
| 17 Jun 2024, 12:43 | 7.71 | 7.71 |
| 1 Mar 2024, 10:08 | 7.52 | 7.52 |
| 2 Feb 2024, 11:27 | 7.7 | 7.7 |
| 10 Jan 2024, 09:21 | 7.55 | 7.55 |
| 5 Dec 2023, 09:34 | 7.36 | 7.36 |
| 10 Nov 2023, 09:59 | 7.32 | 7.32 |
| 2 Oct 2023, 13:30 | 7.18 | 7.18 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 10 Jul 2026, 3 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Jul 2026, 16:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Jun 2026, 09:26 | 0.044 | 0.044 mg/l |
| 15 May 2026, 09:23 | 0.11 | 0.11 mg/l |
| 20 Apr 2026, 11:21 | 0.23 | 0.23 mg/l |
| 26 Mar 2026, 09:29 | 0.48 | 0.48 mg/l |
| 4 Feb 2026, 10:05 | 0.3 | 0.3 mg/l |
| 21 Jan 2026, 11:43 | 0.41 | 0.41 mg/l |
| 10 Dec 2025, 12:40 | 0.063 | 0.063 mg/l |
| 13 Nov 2025, 09:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Oct 2025, 09:49 | 0.069 | 0.069 mg/l |
| 5 Sep 2025, 12:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Aug 2025, 10:03 | 0.19 | 0.19 mg/l |
| 17 Jul 2025, 08:53 | 0.049 | 0.049 mg/l |
| 12 Jun 2025, 10:59 | 0.033 | 0.033 mg/l |
| 29 May 2025, 10:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Mar 2025, 13:02 | 0.29 | 0.29 mg/l |
| 12 Feb 2025, 10:10 | 0.37 | 0.37 mg/l |
| 23 Jan 2025, 12:48 | 0.27 | 0.27 mg/l |
| 13 Dec 2024, 12:58 | 0.13 | 0.13 mg/l |
| 27 Nov 2024, 10:32 | 0.56 | 0.56 mg/l |
| 25 Oct 2024, 09:20 | 0.29 | 0.29 mg/l |
| 19 Sep 2024, 11:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Aug 2024, 11:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jul 2024, 11:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jun 2024, 12:43 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Mar 2024, 10:08 | 0.28 | 0.28 mg/l |
| 2 Feb 2024, 11:27 | 0.13 | 0.13 mg/l |
| 10 Jan 2024, 09:21 | 0.42 | 0.42 mg/l |
| 5 Dec 2023, 09:34 | 0.33 | 0.33 mg/l |
| 10 Nov 2023, 09:59 | 0.23 | 0.23 mg/l |
| 2 Oct 2023, 13:30 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
19 mg/l
Sampled 10 Jul 2026, 3 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Jul 2026, 16:19 | 19 | 19 mg/l |
| 26 Jun 2026, 09:26 | 18.9 | 18.9 mg/l |
| 15 May 2026, 09:23 | 14.8 | 14.8 mg/l |
| 20 Apr 2026, 11:21 | 13.7 | 13.7 mg/l |
| 26 Mar 2026, 09:29 | 9.82 | 9.82 mg/l |
| 4 Feb 2026, 10:05 | 2.37 | 2.37 mg/l |
| 21 Jan 2026, 11:43 | 3.62 | 3.62 mg/l |
| 10 Dec 2025, 12:40 | 4.86 | 4.86 mg/l |
| 13 Nov 2025, 09:27 | 7.97 | 7.97 mg/l |
| 8 Oct 2025, 09:49 | 15.9 | 15.9 mg/l |
| 5 Sep 2025, 12:32 | 7.47 | 7.47 mg/l |
| 1 Aug 2025, 10:03 | 9.82 | 9.82 mg/l |
| 17 Jul 2025, 08:53 | 16.9 | 16.9 mg/l |
| 12 Jun 2025, 10:59 | 12.9 | 12.9 mg/l |
| 29 May 2025, 10:20 | 11.9 | 11.9 mg/l |
| 5 Mar 2025, 13:02 | 6.47 | 6.47 mg/l |
| 12 Feb 2025, 10:10 | 5.86 | 5.86 mg/l |
| 23 Jan 2025, 12:48 | 8.28 | 8.28 mg/l |
| 13 Dec 2024, 12:58 | 6.65 | 6.65 mg/l |
| 27 Nov 2024, 10:32 | 3.25 | 3.25 mg/l |
| 25 Oct 2024, 09:20 | 5.52 | 5.52 mg/l |
| 19 Sep 2024, 11:20 | 11 | 11 mg/l |
| 21 Aug 2024, 11:38 | 16 | 16 mg/l |
| 15 Jul 2024, 11:51 | 11 | 11 mg/l |
| 17 Jun 2024, 12:43 | 11.9 | 11.9 mg/l |
| 1 Mar 2024, 10:08 | 2.96 | 2.96 mg/l |
| 2 Feb 2024, 11:27 | 8.63 | 8.63 mg/l |
| 10 Jan 2024, 09:21 | 5.54 | 5.54 mg/l |
| 5 Dec 2023, 09:34 | 3.81 | 3.81 mg/l |
| 10 Nov 2023, 09:59 | 4.62 | 4.62 mg/l |
| 2 Oct 2023, 13:30 | 14 | 14 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.072 mg/l
Sampled 10 Jul 2026, 3 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Jul 2026, 16:19 | 0.072 | 0.072 mg/l |
| 26 Jun 2026, 09:26 | 0.097 | 0.097 mg/l |
| 15 May 2026, 09:23 | 0.053 | 0.053 mg/l |
| 20 Apr 2026, 11:21 | 0.041 | 0.041 mg/l |
| 26 Mar 2026, 09:29 | 0.11 | 0.11 mg/l |
| 4 Feb 2026, 10:05 | 0.16 | 0.16 mg/l |
| 21 Jan 2026, 11:43 | 0.14 | 0.14 mg/l |
| 10 Dec 2025, 12:40 | 0.094 | 0.094 mg/l |
| 13 Nov 2025, 09:27 | 0.09 | 0.09 mg/l |
| 8 Oct 2025, 09:49 | 0.15 | 0.15 mg/l |
| 5 Sep 2025, 12:32 | 0.095 | 0.095 mg/l |
| 1 Aug 2025, 10:03 | 0.12 | 0.12 mg/l |
| 17 Jul 2025, 08:53 | 0.13 | 0.13 mg/l |
| 12 Jun 2025, 10:59 | 0.13 | 0.13 mg/l |
| 29 May 2025, 10:20 | 0.1 | 0.1 mg/l |
| 5 Mar 2025, 13:02 | 0.04 | 0.04 mg/l |
| 12 Feb 2025, 10:10 | 0.062 | 0.062 mg/l |
| 23 Jan 2025, 12:48 | 0.05 | 0.05 mg/l |
| 13 Dec 2024, 12:58 | 0.05 | 0.05 mg/l |
| 27 Nov 2024, 10:32 | 0.058 | 0.058 mg/l |
| 25 Oct 2024, 09:20 | 0.061 | 0.061 mg/l |
| 19 Sep 2024, 11:20 | 0.067 | 0.067 mg/l |
| 21 Aug 2024, 11:38 | 0.074 | 0.074 mg/l |
| 15 Jul 2024, 11:51 | 0.09 | 0.09 mg/l |
| 17 Jun 2024, 12:43 | 0.052 | 0.052 mg/l |
| 1 Mar 2024, 10:08 | 0.079 | 0.079 mg/l |
| 2 Feb 2024, 11:27 | 0.059 | 0.059 mg/l |
| 10 Jan 2024, 09:21 | 0.075 | 0.075 mg/l |
| 5 Dec 2023, 09:34 | 0.086 | 0.086 mg/l |
| 10 Nov 2023, 09:59 | 0.076 | 0.076 mg/l |
| 2 Oct 2023, 13:30 | 0.052 | 0.052 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
877 µS/cm
Sampled 10 Jul 2026, 3 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Jul 2026, 16:19 | 877 | 877 µS/cm |
| 26 Jun 2026, 09:26 | 838 | 838 µS/cm |
| 15 May 2026, 09:23 | 693 | 693 µS/cm |
| 20 Apr 2026, 11:21 | 688 | 688 µS/cm |
| 26 Mar 2026, 09:29 | 616 | 616 µS/cm |
| 4 Feb 2026, 10:05 | 322 | 322 µS/cm |
| 21 Jan 2026, 11:43 | 429 | 429 µS/cm |
| 10 Dec 2025, 12:40 | 512 | 512 µS/cm |
| 13 Nov 2025, 09:27 | 576 | 576 µS/cm |
| 8 Oct 2025, 09:49 | 813 | 813 µS/cm |
| 5 Sep 2025, 12:32 | 555 | 555 µS/cm |
| 1 Aug 2025, 10:03 | 581 | 581 µS/cm |
| 17 Jul 2025, 08:53 | 864 | 864 µS/cm |
| 12 Jun 2025, 10:59 | 734 | 734 µS/cm |
| 29 May 2025, 10:20 | 674 | 674 µS/cm |
| 23 Apr 2025, 12:57 | 632 | 632 µS/cm |
| 5 Mar 2025, 13:02 | 574 | 574 µS/cm |
| 12 Feb 2025, 10:10 | 546 | 546 µS/cm |
| 23 Jan 2025, 12:48 | 564 | 564 µS/cm |
| 13 Dec 2024, 12:58 | 521 | 521 µS/cm |
| 27 Nov 2024, 10:32 | 368 | 368 µS/cm |
| 25 Oct 2024, 09:20 | 546 | 546 µS/cm |
| 19 Sep 2024, 11:20 | 684 | 684 µS/cm |
| 21 Aug 2024, 11:38 | 777 | 777 µS/cm |
| 15 Jul 2024, 11:51 | 672 | 672 µS/cm |
| 17 Jun 2024, 12:43 | 654 | 654 µS/cm |
| 1 Mar 2024, 10:08 | 384 | 384 µS/cm |
| 2 Feb 2024, 11:27 | 613 | 613 µS/cm |
| 10 Jan 2024, 09:21 | 527 | 527 µS/cm |
| 5 Dec 2023, 09:34 | 493 | 493 µS/cm |
| 10 Nov 2023, 09:59 | 468 | 468 µS/cm |
| 2 Oct 2023, 13:30 | 728 | 728 µS/cm |
Everything measured here
60 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 60 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 32 | Oct 2023 – Jul 2026 | 92.5% 10 Jul 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 32 | Oct 2023 – Jul 2026 | 7.84 mg/l 10 Jul 2026 |
| Temperature of Water 0076 | River water | 32 | Oct 2023 – Jul 2026 | 23.5 °C 10 Jul 2026 |
| pH 0061 | River water | 32 | Oct 2023 – Jul 2026 | 7.42 10 Jul 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 31 | Oct 2023 – Jul 2026 | below 0.03 mg/l 10 Jul 2026 |
| Nitrate as N 0117 | River water | 31 | Oct 2023 – Jul 2026 | 19 mg/l 10 Jul 2026 |
| Orthophosphate, reactive as P 0180 | River water | 31 | Oct 2023 – Jul 2026 | 0.072 mg/l 10 Jul 2026 |
| Conductivity at 25 C 0077 | River water | 32 | Oct 2023 – Jul 2026 | 877 µS/cm 10 Jul 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 3 | Oct 2023 – Jan 2025 | below 0.001 µg/l 23 Jan 2025 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 3 | Oct 2023 – Jan 2025 | below 0.001 µg/l 23 Jan 2025 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 3 | Oct 2023 – Jan 2025 | below 0.001 µg/l 23 Jan 2025 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 3 | Oct 2023 – Jan 2025 | below 0.002 µg/l 23 Jan 2025 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 3 | Oct 2023 – Jan 2025 | below 0.0005 µg/l 23 Jan 2025 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 2 | Feb 2024 – Jan 2025 | below 0.001 µg/l 23 Jan 2025 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 3 | Oct 2023 – Jan 2025 | below 0.0005 µg/l 23 Jan 2025 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 3 | Oct 2023 – Jan 2025 | below 0.004 µg/l 23 Jan 2025 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Jan 2025 – Jan 2025 | below 0.005 µg/l 23 Jan 2025 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 3 | Oct 2023 – Jan 2025 | below 0.0005 µg/l 23 Jan 2025 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 3 | Oct 2023 – Jan 2025 | 0.0014 µg/l 23 Jan 2025 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 3 | Oct 2023 – Jan 2025 | below 0.001 µg/l 23 Jan 2025 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 3 | Oct 2023 – Jan 2025 | below 0.0005 µg/l 23 Jan 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 31 | Oct 2023 – Jul 2026 | 92 mg/l 10 Jul 2026 |
| Ammonia un-ionised as N 0119 | River water | 31 | Oct 2023 – Jul 2026 | below 0.0004 mg/l 10 Jul 2026 |
| BOD : 5 Day ATU 0085 | River water | 30 | Oct 2023 – Jul 2026 | 1.1 mg/l 10 Jul 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 3 | Oct 2023 – Jan 2025 | below 0.001 µg/l 23 Jan 2025 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 3 | Oct 2023 – Jan 2025 | below 0.002 µg/l 23 Jan 2025 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 3 | Oct 2023 – Jan 2025 | below 0.002 µg/l 23 Jan 2025 |
| Nitrite as N 0118 | River water | 31 | Oct 2023 – Jul 2026 | 0.029 mg/l 10 Jul 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 31 | Oct 2023 – Jul 2026 | 19 mg/l 10 Jul 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 3 | Oct 2023 – Jan 2025 | below 0.0005 µg/l 23 Jan 2025 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 2 | Oct 2023 – Jan 2025 | below 0.0005 µg/l 23 Jan 2025 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 3 | Oct 2023 – Jan 2025 | below 0.0005 µg/l 23 Jan 2025 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 3 | Oct 2023 – Jan 2025 | below 0.0005 µg/l 23 Jan 2025 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 3 | Oct 2023 – Jan 2025 | below 0.0005 µg/l 23 Jan 2025 |
| Perfluorobutanesulfonic acid 2972 | River water | 3 | Oct 2023 – Jan 2025 | 0.002 µg/l 23 Jan 2025 |
| Perfluorobutanoic acid 2995 | River water | 3 | Oct 2023 – Jan 2025 | 0.0019 µg/l 23 Jan 2025 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 3 | Oct 2023 – Jan 2025 | below 0.0005 µg/l 23 Jan 2025 |
| Perfluorodecanesulfonic acid 2969 | River water | 3 | Oct 2023 – Jan 2025 | below 0.002 µg/l 23 Jan 2025 |
| Perfluorodecanoic acid 8892 | River water | 3 | Oct 2023 – Jan 2025 | below 0.002 µg/l 23 Jan 2025 |
| Perfluorododecane sulfonic acid 2968 | River water | 3 | Oct 2023 – Jan 2025 | below 0.005 µg/l 23 Jan 2025 |
| Perfluorododecanoic acid 8894 | River water | 3 | Oct 2023 – Jan 2025 | below 0.002 µg/l 23 Jan 2025 |
| Perfluoroheptanesulfonic acid 2967 | River water | 3 | Oct 2023 – Jan 2025 | below 0.0005 µg/l 23 Jan 2025 |
| Perfluoroheptanoic acid 8889 | River water | 3 | Oct 2023 – Jan 2025 | below 0.001 µg/l 23 Jan 2025 |
| Perfluorohexanesulfonamide 2965 | River water | 3 | Oct 2023 – Jan 2025 | below 0.0005 µg/l 23 Jan 2025 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 3 | Oct 2023 – Jan 2025 | below 0.0005 µg/l 23 Jan 2025 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 3 | Oct 2023 – Jan 2025 | 0.0015 µg/l 23 Jan 2025 |
| Perfluorohexanoic acid 8888 | River water | 3 | Oct 2023 – Jan 2025 | 0.0025 µg/l 23 Jan 2025 |
| Perfluorononanesulfonic acid 2963 | River water | 3 | Oct 2023 – Jan 2025 | below 0.0005 µg/l 23 Jan 2025 |
| Perfluorononanoic acid 8891 | River water | 3 | Oct 2023 – Jan 2025 | below 0.001 µg/l 23 Jan 2025 |
| Perfluorooctadecanoic acid 2962 | River water | 3 | Oct 2023 – Jan 2025 | below 0.002 µg/l 23 Jan 2025 |
| Perfluorooctanesulfonamide 2961 | River water | 3 | Oct 2023 – Jan 2025 | below 0.001 µg/l 23 Jan 2025 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 3 | Oct 2023 – Jan 2025 | 0.0013 µg/l 23 Jan 2025 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 3 | Oct 2023 – Jan 2025 | 0.0011 µg/l 23 Jan 2025 |
| Perfluorooctanoic acid 8890 | River water | 3 | Oct 2023 – Jan 2025 | 0.0019 µg/l 23 Jan 2025 |
| Perfluoropentanesulfonic acid 2957 | River water | 3 | Oct 2023 – Jan 2025 | below 0.0005 µg/l 23 Jan 2025 |
| Perfluoropentanoic acid 8887 | River water | 3 | Oct 2023 – Jan 2025 | below 0.002 µg/l 23 Jan 2025 |
| Perfluorotetradecanoic acid 8895 | River water | 3 | Oct 2023 – Jan 2025 | below 0.006 µg/l 23 Jan 2025 |
| Perfluorotridecanoic acid 2955 | River water | 2 | Oct 2023 – Jan 2025 | below 0.005 µg/l 23 Jan 2025 |
| Perfluoroundecane sulfonic acid 2953 | River water | 3 | Oct 2023 – Jan 2025 | below 0.004 µg/l 23 Jan 2025 |
| Perfluoroundecanoic acid 8893 | River water | 3 | Oct 2023 – Jan 2025 | below 0.002 µg/l 23 Jan 2025 |
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.