Lee at Rye House
EA name: LEE AT RYE HOUSE
Environment Agency sampling point TH-PLER0073 · 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
- 4 Sep 2026, 12:1427 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 29 since 1 Nov 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 538504, 209875As published, to the nearest 1 m. Open in a map
- River, by its own name
- Lee
- River, by the map
- River LeaPlaced on the river its name gives, 12 m from the line.
- Next gauge downstream
- None tracedThe map stops before any gauge.Beside Hoddesdon, Rye Bridge: too close to say above or below.
- Nearest gauge upstream
- Tumbling Bay Weir On the Amwell Loop · 5.8 km along the riverMardock On the River Ash · 8.1 km along the river
- Why it was sampled
- Monitoring (national agency policy) (23 samples)
Environmental monitoring statutory (EU directives) (6 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
110.3%
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 12:14 | 110.3 | 110.3% |
| 5 Aug 2026, 12:40 | 112.9 | 112.9% |
| 8 Jul 2026, 11:02 | 111.8 | 111.8% |
| 5 Jun 2026, 09:29 | 89.7 | 89.7% |
| 14 May 2026, 11:39 | 91.7 | 91.7% |
| 8 Apr 2026, 14:17 | 100.1 | 100.1% |
| 4 Mar 2026, 08:42 | 95.1 | 95.1% |
| 4 Feb 2026, 09:23 | 97.6 | 97.6% |
| 20 Jan 2026, 09:21 | 96.1 | 96.1% |
| 3 Dec 2025, 12:59 | 95.2 | 95.2% |
| 4 Nov 2025, 12:17 | 88.6 | 88.6% |
| 16 Oct 2025, 15:04 | 85.6 | 85.6% |
| 5 Sep 2025, 13:54 | 55.9 | 55.9% |
| 21 Aug 2025, 12:15 | 111.3 | 111.3% |
| 23 Jul 2025, 13:46 | 92.2 | 92.2% |
| 11 Jun 2025, 11:59 | 99.2 | 99.2% |
| 21 May 2025, 09:55 | 98.9 | 98.9% |
| 23 Apr 2025, 14:48 | 101 | 101% |
| 7 Mar 2025, 11:11 | 98.5 | 98.5% |
| 4 Feb 2025, 11:56 | 96.9 | 96.9% |
| 21 Jan 2025, 11:42 | 98.3 | 98.3% |
| 6 Dec 2024, 11:14 | 97.8 | 97.8% |
| 20 Nov 2024, 09:20 | 46.5 | 46.5% |
| 14 Oct 2024, 13:30 | 87.4 | 87.4% |
| 17 Sep 2024, 13:57 | 120.7 | 120.7% |
| 22 Aug 2024, 11:55 | 94.5 | 94.5% |
| 15 Jul 2024, 11:24 | 96.2 | 96.2% |
| 17 Jun 2024, 09:07 | 91.6 | 91.6% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.3 mg/l
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 12:14 | 10.3 | 10.3 mg/l |
| 5 Aug 2026, 12:40 | 10.2 | 10.2 mg/l |
| 8 Jul 2026, 11:02 | 9.73 | 9.73 mg/l |
| 5 Jun 2026, 09:29 | 8.89 | 8.89 mg/l |
| 14 May 2026, 11:39 | 9.95 | 9.95 mg/l |
| 8 Apr 2026, 14:17 | 10.4 | 10.4 mg/l |
| 4 Mar 2026, 08:42 | 10.8 | 10.8 mg/l |
| 4 Feb 2026, 09:23 | 11.7 | 11.7 mg/l |
| 20 Jan 2026, 09:21 | 11.3 | 11.3 mg/l |
| 3 Dec 2025, 12:59 | 11.2 | 11.2 mg/l |
| 4 Nov 2025, 12:17 | 9.64 | 9.64 mg/l |
| 16 Oct 2025, 15:04 | 9.1 | 9.1 mg/l |
| 5 Sep 2025, 13:54 | 5.4 | 5.4 mg/l |
| 21 Aug 2025, 12:15 | 10.6 | 10.6 mg/l |
| 23 Jul 2025, 13:46 | 8.43 | 8.43 mg/l |
| 11 Jun 2025, 11:59 | 9.64 | 9.64 mg/l |
| 21 May 2025, 09:55 | 9.88 | 9.88 mg/l |
| 23 Apr 2025, 14:48 | 10.6 | 10.6 mg/l |
| 7 Mar 2025, 11:11 | 11.5 | 11.5 mg/l |
| 4 Feb 2025, 11:56 | 11.9 | 11.9 mg/l |
| 21 Jan 2025, 11:42 | 12.1 | 12.1 mg/l |
| 6 Dec 2024, 11:14 | 11.3 | 11.3 mg/l |
| 20 Nov 2024, 09:20 | 5.99 | 5.99 mg/l |
| 14 Oct 2024, 13:30 | 9.42 | 9.42 mg/l |
| 17 Sep 2024, 13:57 | 12.1 | 12.1 mg/l |
| 22 Aug 2024, 11:55 | 9.28 | 9.28 mg/l |
| 15 Jul 2024, 11:24 | 9.49 | 9.49 mg/l |
| 17 Jun 2024, 09:07 | 9.23 | 9.23 mg/l |
Water temperature
code 0076 · °C
18.4 °C
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 12:14 | 18.4 | 18.4 °C |
| 5 Aug 2026, 12:40 | 20 | 20 °C |
| 8 Jul 2026, 11:02 | 22.1 | 22.1 °C |
| 5 Jun 2026, 09:29 | 15.7 | 15.7 °C |
| 14 May 2026, 11:39 | 11.6 | 11.6 °C |
| 8 Apr 2026, 14:17 | 13.7 | 13.7 °C |
| 4 Mar 2026, 08:42 | 9.5 | 9.5 °C |
| 4 Feb 2026, 09:23 | 7.4 | 7.4 °C |
| 20 Jan 2026, 09:21 | 8.2 | 8.2 °C |
| 3 Dec 2025, 12:59 | 8.2 | 8.2 °C |
| 4 Nov 2025, 12:17 | 11.5 | 11.5 °C |
| 16 Oct 2025, 15:04 | 12.5 | 12.5 °C |
| 5 Sep 2025, 13:54 | 16.9 | 16.9 °C |
| 21 Aug 2025, 12:15 | 17.8 | 17.8 °C |
| 23 Jul 2025, 13:46 | 19.6 | 19.6 °C |
| 11 Jun 2025, 11:59 | 16.6 | 16.6 °C |
| 21 May 2025, 09:55 | 15.3 | 15.3 °C |
| 23 Apr 2025, 14:48 | 12.9 | 12.9 °C |
| 7 Mar 2025, 11:11 | 8.4 | 8.4 °C |
| 4 Feb 2025, 11:56 | 6.6 | 6.6 °C |
| 21 Jan 2025, 11:42 | 6.3 | 6.3 °C |
| 6 Dec 2024, 11:14 | 8.9 | 8.9 °C |
| 20 Nov 2024, 09:20 | 4.6 | 4.6 °C |
| 14 Oct 2024, 13:30 | 11.9 | 11.9 °C |
| 17 Sep 2024, 13:57 | 15.2 | 15.2 °C |
| 22 Aug 2024, 11:55 | 16.1 | 16.1 °C |
| 15 Jul 2024, 11:24 | 15.9 | 15.9 °C |
| 17 Jun 2024, 09:07 | 14.9 | 14.9 °C |
pH
code 0061
7.9
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 12:14 | 7.9 | 7.9 |
| 5 Aug 2026, 12:40 | 7.88 | 7.88 |
| 8 Jul 2026, 11:02 | 7.97 | 7.97 |
| 5 Jun 2026, 09:29 | 7.93 | 7.93 |
| 14 May 2026, 11:39 | 8.18 | 8.18 |
| 8 Apr 2026, 14:17 | 8.11 | 8.11 |
| 4 Mar 2026, 08:42 | 7.89 | 7.89 |
| 4 Feb 2026, 09:23 | 8.03 | 8.03 |
| 20 Jan 2026, 09:21 | 7.93 | 7.93 |
| 3 Dec 2025, 12:59 | 7.99 | 7.99 |
| 4 Nov 2025, 12:17 | 7.77 | 7.77 |
| 16 Oct 2025, 15:04 | 7.89 | 7.89 |
| 5 Sep 2025, 13:54 | 7.25 | 7.25 |
| 21 Aug 2025, 12:15 | 7.99 | 7.99 |
| 23 Jul 2025, 13:46 | 7.91 | 7.91 |
| 11 Jun 2025, 11:59 | 7.92 | 7.92 |
| 21 May 2025, 09:55 | 7.96 | 7.96 |
| 23 Apr 2025, 14:48 | 8.01 | 8.01 |
| 7 Mar 2025, 11:11 | 7.99 | 7.99 |
| 4 Feb 2025, 11:56 | 7.97 | 7.97 |
| 21 Jan 2025, 11:42 | 7.99 | 7.99 |
| 6 Dec 2024, 11:14 | 8.01 | 8.01 |
| 20 Nov 2024, 09:20 | 7.49 | 7.49 |
| 14 Oct 2024, 13:30 | 7.65 | 7.65 |
| 17 Sep 2024, 13:57 | 7.95 | 7.95 |
| 22 Aug 2024, 11:55 | 7.88 | 7.88 |
| 15 Jul 2024, 11:24 | 7.89 | 7.89 |
| 17 Jun 2024, 09:07 | 7.91 | 7.91 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.04 mg/l
Sampled 4 Sep 2026, 27 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 12:14 | 0.04 | 0.04 mg/l |
| 8 Jul 2026, 11:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Jun 2026, 09:29 | 0.046 | 0.046 mg/l |
| 14 May 2026, 11:39 | 0.033 | 0.033 mg/l |
| 8 Apr 2026, 14:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Mar 2026, 08:42 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Feb 2026, 09:23 | 0.044 | 0.044 mg/l |
| 20 Jan 2026, 09:21 | 0.053 | 0.053 mg/l |
| 3 Dec 2025, 12:59 | 0.044 | 0.044 mg/l |
| 4 Nov 2025, 12:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Oct 2025, 15:04 | 0.041 | 0.041 mg/l |
| 5 Sep 2025, 13:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Aug 2025, 12:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Jul 2025, 13:46 | 0.053 | 0.053 mg/l |
| 11 Jun 2025, 11:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 May 2025, 09:55 | 0.03 | 0.03 mg/l |
| 23 Apr 2025, 14:48 | 0.06 | 0.06 mg/l |
| 7 Mar 2025, 11:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Feb 2025, 11:56 | 0.032 | 0.032 mg/l |
| 21 Jan 2025, 11:42 | 0.033 | 0.033 mg/l |
| 20 Nov 2024, 09:20 | 0.34 | 0.34 mg/l |
| 14 Oct 2024, 13:30 | 0.041 | 0.041 mg/l |
| 17 Sep 2024, 13:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Aug 2024, 11:55 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jul 2024, 11:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jun 2024, 09:07 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
4.86 mg/l
Sampled 4 Sep 2026, 27 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 12:14 | 4.86 | 4.86 mg/l |
| 8 Jul 2026, 11:02 | 5.37 | 5.37 mg/l |
| 5 Jun 2026, 09:29 | 5.78 | 5.78 mg/l |
| 14 May 2026, 11:39 | 7.38 | 7.38 mg/l |
| 8 Apr 2026, 14:17 | 7.79 | 7.79 mg/l |
| 4 Mar 2026, 08:42 | 7.29 | 7.29 mg/l |
| 4 Feb 2026, 09:23 | 8.38 | 8.38 mg/l |
| 20 Jan 2026, 09:21 | 8.68 | 8.68 mg/l |
| 3 Dec 2025, 12:59 | 8.17 | 8.17 mg/l |
| 4 Nov 2025, 12:17 | 6.87 | 6.87 mg/l |
| 16 Oct 2025, 15:04 | 6.87 | 6.87 mg/l |
| 5 Sep 2025, 13:54 | <0.196 | below 0.196 mg/l (not detected above this) |
| 21 Aug 2025, 12:15 | 6.18 | 6.18 mg/l |
| 23 Jul 2025, 13:46 | 9.66 | 9.66 mg/l |
| 11 Jun 2025, 11:59 | 6.88 | 6.88 mg/l |
| 21 May 2025, 09:55 | 8.58 | 8.58 mg/l |
| 23 Apr 2025, 14:48 | 10.9 | 10.9 mg/l |
| 7 Mar 2025, 11:11 | 7.68 | 7.68 mg/l |
| 4 Feb 2025, 11:56 | 8.28 | 8.28 mg/l |
| 21 Jan 2025, 11:42 | 8.58 | 8.58 mg/l |
| 20 Nov 2024, 09:20 | 3.61 | 3.61 mg/l |
| 14 Oct 2024, 13:30 | 11 | 11 mg/l |
| 17 Sep 2024, 13:57 | 6.19 | 6.19 mg/l |
| 22 Aug 2024, 11:55 | 6.49 | 6.49 mg/l |
| 15 Jul 2024, 11:24 | 6.29 | 6.29 mg/l |
| 17 Jun 2024, 09:07 | 7.08 | 7.08 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.13 mg/l
Sampled 4 Sep 2026, 27 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 12:14 | 0.13 | 0.13 mg/l |
| 8 Jul 2026, 11:02 | 0.11 | 0.11 mg/l |
| 5 Jun 2026, 09:29 | 0.14 | 0.14 mg/l |
| 14 May 2026, 11:39 | 0.099 | 0.099 mg/l |
| 8 Apr 2026, 14:17 | 0.081 | 0.081 mg/l |
| 4 Mar 2026, 08:42 | 0.089 | 0.089 mg/l |
| 4 Feb 2026, 09:23 | 0.11 | 0.11 mg/l |
| 20 Jan 2026, 09:21 | 0.12 | 0.12 mg/l |
| 3 Dec 2025, 12:59 | 0.12 | 0.12 mg/l |
| 4 Nov 2025, 12:17 | 0.12 | 0.12 mg/l |
| 16 Oct 2025, 15:04 | 0.13 | 0.13 mg/l |
| 5 Sep 2025, 13:54 | 3.1 | 3.1 mg/l |
| 21 Aug 2025, 12:15 | 0.1 | 0.1 mg/l |
| 23 Jul 2025, 13:46 | 0.27 | 0.27 mg/l |
| 11 Jun 2025, 11:59 | 0.1 | 0.1 mg/l |
| 21 May 2025, 09:55 | 0.09 | 0.09 mg/l |
| 23 Apr 2025, 14:48 | 0.14 | 0.14 mg/l |
| 7 Mar 2025, 11:11 | 0.079 | 0.079 mg/l |
| 4 Feb 2025, 11:56 | 0.1 | 0.1 mg/l |
| 21 Jan 2025, 11:42 | 0.11 | 0.11 mg/l |
| 20 Nov 2024, 09:20 | 1.9 | 1.9 mg/l |
| 14 Oct 2024, 13:30 | 0.22 | 0.22 mg/l |
| 17 Sep 2024, 13:57 | 0.11 | 0.11 mg/l |
| 22 Aug 2024, 11:55 | 0.13 | 0.13 mg/l |
| 15 Jul 2024, 11:24 | 0.15 | 0.15 mg/l |
| 17 Jun 2024, 09:07 | 0.14 | 0.14 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
723 µS/cm
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 12:14 | 723 | 723 µS/cm |
| 5 Aug 2026, 12:40 | 738 | 738 µS/cm |
| 8 Jul 2026, 11:02 | 742 | 742 µS/cm |
| 5 Jun 2026, 09:29 | 719 | 719 µS/cm |
| 14 May 2026, 11:39 | 751 | 751 µS/cm |
| 8 Apr 2026, 14:17 | 881 | 881 µS/cm |
| 4 Mar 2026, 08:42 | 741 | 741 µS/cm |
| 4 Feb 2026, 09:23 | 730 | 730 µS/cm |
| 20 Jan 2026, 09:21 | 745 | 745 µS/cm |
| 3 Dec 2025, 12:59 | 778 | 778 µS/cm |
| 4 Nov 2025, 12:17 | 738 | 738 µS/cm |
| 16 Oct 2025, 15:04 | 756 | 756 µS/cm |
| 5 Sep 2025, 13:54 | 947 | 947 µS/cm |
| 21 Aug 2025, 12:15 | 736 | 736 µS/cm |
| 23 Jul 2025, 13:46 | 842 | 842 µS/cm |
| 11 Jun 2025, 11:59 | 735 | 735 µS/cm |
| 21 May 2025, 09:55 | 753 | 753 µS/cm |
| 23 Apr 2025, 14:48 | 1072 | 1072 µS/cm |
| 7 Mar 2025, 11:11 | 758 | 758 µS/cm |
| 4 Feb 2025, 11:56 | 753 | 753 µS/cm |
| 21 Jan 2025, 11:42 | 771 | 771 µS/cm |
| 6 Dec 2024, 11:14 | 701 | 701 µS/cm |
| 20 Nov 2024, 09:20 | 954 | 954 µS/cm |
| 14 Oct 2024, 13:30 | 781 | 781 µS/cm |
| 17 Sep 2024, 13:57 | 738 | 738 µS/cm |
| 22 Aug 2024, 11:55 | 752 | 752 µS/cm |
| 15 Jul 2024, 11:24 | 726 | 726 µS/cm |
| 17 Jun 2024, 09:07 | 750 | 750 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 | 28 | Jun 2024 – Sep 2026 | 110.3% 4 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 28 | Jun 2024 – Sep 2026 | 10.3 mg/l 4 Sep 2026 |
| Temperature of Water 0076 | River water | 28 | Jun 2024 – Sep 2026 | 18.4 °C 4 Sep 2026 |
| pH 0061 | River water | 28 | Jun 2024 – Sep 2026 | 7.9 4 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 26 | Jun 2024 – Sep 2026 | 0.04 mg/l 4 Sep 2026 |
| Nitrate as N 0117 | River water | 26 | Jun 2024 – Sep 2026 | 4.86 mg/l 4 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 26 | Jun 2024 – Sep 2026 | 0.13 mg/l 4 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 28 | Jun 2024 – Sep 2026 | 723 µS/cm 4 Sep 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 2 | Nov 2023 – Jan 2025 | below 0.001 µg/l 21 Jan 2025 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 2 | Nov 2023 – Jan 2025 | below 0.001 µg/l 21 Jan 2025 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 2 | Nov 2023 – Jan 2025 | below 0.001 µg/l 21 Jan 2025 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 2 | Nov 2023 – Jan 2025 | below 0.002 µg/l 21 Jan 2025 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 2 | Nov 2023 – Jan 2025 | below 0.0005 µg/l 21 Jan 2025 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 2 | Nov 2023 – Jan 2025 | below 0.001 µg/l 21 Jan 2025 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 2 | Nov 2023 – Jan 2025 | below 0.0005 µg/l 21 Jan 2025 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 2 | Nov 2023 – Jan 2025 | below 0.004 µg/l 21 Jan 2025 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 2 | Nov 2023 – Jan 2025 | below 0.005 µg/l 21 Jan 2025 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 2 | Nov 2023 – Jan 2025 | below 0.0005 µg/l 21 Jan 2025 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 2 | Nov 2023 – Jan 2025 | below 0.001 µg/l 21 Jan 2025 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 2 | Nov 2023 – Jan 2025 | below 0.001 µg/l 21 Jan 2025 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 2 | Nov 2023 – Jan 2025 | below 0.0005 µg/l 21 Jan 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 27 | Jun 2024 – Sep 2026 | 230 mg/l 4 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 26 | Jun 2024 – Sep 2026 | 0.00107 mg/l 4 Sep 2026 |
| BOD : 5 Day ATU 0085 | River water | 23 | Jun 2024 – May 2026 | 1.5 mg/l 14 May 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 2 | Nov 2023 – Jan 2025 | below 0.001 µg/l 21 Jan 2025 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 2 | Nov 2023 – Jan 2025 | below 0.002 µg/l 21 Jan 2025 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 2 | Nov 2023 – Jan 2025 | below 0.002 µg/l 21 Jan 2025 |
| Nitrite as N 0118 | River water | 26 | Jun 2024 – Sep 2026 | 0.036 mg/l 4 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 27 | Jun 2024 – Sep 2026 | 4.9 mg/l 4 Sep 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 2 | Nov 2023 – Jan 2025 | below 0.0005 µg/l 21 Jan 2025 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 2 | Nov 2023 – Jan 2025 | below 0.0005 µg/l 21 Jan 2025 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 2 | Nov 2023 – Jan 2025 | below 0.0005 µg/l 21 Jan 2025 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 2 | Nov 2023 – Jan 2025 | below 0.0005 µg/l 21 Jan 2025 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 2 | Nov 2023 – Jan 2025 | 0.00085 µg/l 21 Jan 2025 |
| Perfluorobutanesulfonic acid 2972 | River water | 2 | Nov 2023 – Jan 2025 | 0.0016 µg/l 21 Jan 2025 |
| Perfluorobutanoic acid 2995 | River water | 2 | Nov 2023 – Jan 2025 | 0.0022 µg/l 21 Jan 2025 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 2 | Nov 2023 – Jan 2025 | below 0.0005 µg/l 21 Jan 2025 |
| Perfluorodecanesulfonic acid 2969 | River water | 2 | Nov 2023 – Jan 2025 | below 0.002 µg/l 21 Jan 2025 |
| Perfluorodecanoic acid 8892 | River water | 2 | Nov 2023 – Jan 2025 | below 0.002 µg/l 21 Jan 2025 |
| Perfluorododecane sulfonic acid 2968 | River water | 2 | Nov 2023 – Jan 2025 | below 0.005 µg/l 21 Jan 2025 |
| Perfluorododecanoic acid 8894 | River water | 2 | Nov 2023 – Jan 2025 | below 0.002 µg/l 21 Jan 2025 |
| Perfluoroheptanesulfonic acid 2967 | River water | 2 | Nov 2023 – Jan 2025 | below 0.0005 µg/l 21 Jan 2025 |
| Perfluoroheptanoic acid 8889 | River water | 2 | Nov 2023 – Jan 2025 | below 0.001 µg/l 21 Jan 2025 |
| Perfluorohexanesulfonamide 2965 | River water | 2 | Nov 2023 – Jan 2025 | below 0.0005 µg/l 21 Jan 2025 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 2 | Nov 2023 – Jan 2025 | 0.00053 µg/l 21 Jan 2025 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 2 | Nov 2023 – Jan 2025 | 0.0022 µg/l 21 Jan 2025 |
| Perfluorohexanoic acid 8888 | River water | 2 | Nov 2023 – Jan 2025 | 0.0018 µg/l 21 Jan 2025 |
| Perfluorononanesulfonic acid 2963 | River water | 2 | Nov 2023 – Jan 2025 | below 0.0005 µg/l 21 Jan 2025 |
| Perfluorononanoic acid 8891 | River water | 2 | Nov 2023 – Jan 2025 | below 0.001 µg/l 21 Jan 2025 |
| Perfluorooctadecanoic acid 2962 | River water | 2 | Nov 2023 – Jan 2025 | below 0.002 µg/l 21 Jan 2025 |
| Perfluorooctanesulfonamide 2961 | River water | 2 | Nov 2023 – Jan 2025 | below 0.001 µg/l 21 Jan 2025 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 2 | Nov 2023 – Jan 2025 | 0.0019 µg/l 21 Jan 2025 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 2 | Nov 2023 – Jan 2025 | 0.0022 µg/l 21 Jan 2025 |
| Perfluorooctanoic acid 8890 | River water | 2 | Nov 2023 – Jan 2025 | 0.0015 µg/l 21 Jan 2025 |
| Perfluoropentanesulfonic acid 2957 | River water | 2 | Nov 2023 – Jan 2025 | below 0.0005 µg/l 21 Jan 2025 |
| Perfluoropentanoic acid 8887 | River water | 2 | Nov 2023 – Jan 2025 | 0.0021 µg/l 21 Jan 2025 |
| Perfluorotetradecanoic acid 8895 | River water | 2 | Nov 2023 – Jan 2025 | below 0.006 µg/l 21 Jan 2025 |
| Perfluorotridecanoic acid 2955 | River water | 2 | Nov 2023 – Jan 2025 | below 0.005 µg/l 21 Jan 2025 |
| Perfluoroundecane sulfonic acid 2953 | River water | 2 | Nov 2023 – Jan 2025 | below 0.004 µg/l 21 Jan 2025 |
| Perfluoroundecanoic acid 8893 | River water | 2 | Nov 2023 – Jan 2025 | below 0.002 µg/l 21 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.