Calder at Horbury Bridge
EA name: CALDER AT HORBURY BRIDGE
Environment Agency sampling point NE-49500336 · 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 Aug 2026, 11:3058 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 43 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 Monitoring (national agency policy)
- Where
- National Grid 428029, 417924As published, to the nearest 1 m. Open in a map
- River, by its own name
- Calder
- River, by the map
- River CalderPlaced on the river its name gives, 7 m from the line.
- Next gauge downstream
- Horbury On the River Calder · 1.0 km along the river
- Nearest gauge upstream
- Dewsbury On the River Calder · 6.4 km along the riverBatley Savile Street On the Batley Beck · 7.7 km along the river
- Why it was sampled
- Monitoring (national agency policy) (26 samples)
Environmental monitoring statutory (EU directives) (17 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
80.3%
Sampled 30 Jun 2026, 3 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Jun 2026, 10:10 | 80.3 | 80.3% |
| 24 Jun 2026, 11:46 | 87.4 | 87.4% |
| 21 May 2026, 10:28 | 91.7 | 91.7% |
| 1 May 2026, 10:52 | 92.7 | 92.7% |
| 21 Apr 2026, 10:09 | 107.1 | 107.1% |
| 7 Apr 2026, 09:46 | 94.7 | 94.7% |
| 16 Mar 2026, 11:45 | 99.2 | 99.2% |
| 12 Mar 2026, 09:25 | 88.4 | 88.4% |
| 19 Feb 2026, 10:15 | 97 | 97% |
| 5 Feb 2026, 11:00 | 98.3 | 98.3% |
| 22 Jan 2026, 11:28 | 96 | 96% |
| 15 Jan 2026, 13:34 | 97 | 97% |
| 13 Mar 2025, 10:22 | 94.6 | 94.6% |
| 21 Feb 2025, 10:46 | 96.5 | 96.5% |
| 23 Jan 2025, 11:05 | 95.8 | 95.8% |
| 10 Dec 2024, 16:14 | 98.1 | 98.1% |
| 19 Nov 2024, 11:24 | 106.2 | 106.2% |
| 15 Oct 2024, 12:06 | 94.6 | 94.6% |
| 25 Sep 2024, 11:32 | 84.7 | 84.7% |
| 21 Aug 2024, 11:20 | 88.9 | 88.9% |
| 17 Jul 2024, 10:44 | 80.6 | 80.6% |
| 6 Jun 2024, 11:56 | 92.9 | 92.9% |
Dissolved oxygen
as O2 · code 9924 · mg/l
7.48 mg/l
Sampled 30 Jun 2026, 3 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Jun 2026, 10:10 | 7.48 | 7.48 mg/l |
| 24 Jun 2026, 11:46 | 7.64 | 7.64 mg/l |
| 21 May 2026, 10:28 | 9.55 | 9.55 mg/l |
| 1 May 2026, 10:52 | 9.57 | 9.57 mg/l |
| 21 Apr 2026, 10:09 | 11.9 | 11.9 mg/l |
| 7 Apr 2026, 09:46 | 10.9 | 10.9 mg/l |
| 16 Mar 2026, 11:45 | 11.7 | 11.7 mg/l |
| 12 Mar 2026, 09:25 | 10.3 | 10.3 mg/l |
| 19 Feb 2026, 10:15 | 12.2 | 12.2 mg/l |
| 5 Feb 2026, 11:00 | 12.2 | 12.2 mg/l |
| 22 Jan 2026, 11:28 | 11.4 | 11.4 mg/l |
| 15 Jan 2026, 13:34 | 12 | 12 mg/l |
| 13 Mar 2025, 10:22 | 11.6 | 11.6 mg/l |
| 21 Feb 2025, 10:46 | 11.2 | 11.2 mg/l |
| 23 Jan 2025, 11:05 | 11.7 | 11.7 mg/l |
| 10 Dec 2024, 16:14 | 11.7 | 11.7 mg/l |
| 19 Nov 2024, 11:24 | 12.7 | 12.7 mg/l |
| 15 Oct 2024, 12:06 | 10.6 | 10.6 mg/l |
| 25 Sep 2024, 11:32 | 8.78 | 8.78 mg/l |
| 21 Aug 2024, 11:20 | 8.75 | 8.75 mg/l |
| 17 Jul 2024, 10:44 | 7.93 | 7.93 mg/l |
| 6 Jun 2024, 11:56 | 9.51 | 9.51 mg/l |
Water temperature
code 0076 · °C
18.7 °C
Sampled 30 Jun 2026, 3 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Jun 2026, 10:10 | 18.7 | 18.7 °C |
| 24 Jun 2026, 11:46 | 21.9 | 21.9 °C |
| 21 May 2026, 10:28 | 13.4 | 13.4 °C |
| 1 May 2026, 10:52 | 13.8 | 13.8 °C |
| 21 Apr 2026, 10:09 | 10.7 | 10.7 °C |
| 7 Apr 2026, 09:46 | 9.1 | 9.1 °C |
| 16 Mar 2026, 11:45 | 8.1 | 8.1 °C |
| 12 Mar 2026, 09:25 | 8.8 | 8.8 °C |
| 19 Feb 2026, 10:15 | 5.5 | 5.5 °C |
| 5 Feb 2026, 11:00 | 6.2 | 6.2 °C |
| 22 Jan 2026, 11:28 | 7.7 | 7.7 °C |
| 15 Jan 2026, 13:34 | 6.1 | 6.1 °C |
| 13 Mar 2025, 10:22 | 6.7 | 6.7 °C |
| 21 Feb 2025, 10:46 | 8.7 | 8.7 °C |
| 23 Jan 2025, 11:05 | 6.8 | 6.8 °C |
| 10 Dec 2024, 16:14 | 7.7 | 7.7 °C |
| 19 Nov 2024, 11:24 | 7.6 | 7.6 °C |
| 15 Oct 2024, 12:06 | 10.3 | 10.3 °C |
| 25 Sep 2024, 11:32 | 13.6 | 13.6 °C |
| 21 Aug 2024, 11:20 | 16 | 16 °C |
| 17 Jul 2024, 10:44 | 16 | 16 °C |
| 6 Jun 2024, 11:56 | 14.2 | 14.2 °C |
pH
code 0061
7.56
Sampled 30 Jun 2026, 3 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Jun 2026, 10:10 | 7.56 | 7.56 |
| 24 Jun 2026, 11:46 | 7.43 | 7.43 |
| 21 May 2026, 10:28 | 7.42 | 7.42 |
| 1 May 2026, 10:52 | 7.4 | 7.4 |
| 21 Apr 2026, 10:09 | 7.48 | 7.48 |
| 7 Apr 2026, 09:46 | 7.44 | 7.44 |
| 16 Mar 2026, 11:45 | 7.59 | 7.59 |
| 12 Mar 2026, 09:25 | 7.57 | 7.57 |
| 19 Feb 2026, 10:15 | 7.42 | 7.42 |
| 5 Feb 2026, 11:00 | 7.8 | 7.8 |
| 22 Jan 2026, 11:28 | 7.48 | 7.48 |
| 15 Jan 2026, 13:34 | 7.56 | 7.56 |
| 13 Mar 2025, 10:22 | 7.61 | 7.61 |
| 21 Feb 2025, 10:46 | 7.52 | 7.52 |
| 23 Jan 2025, 11:05 | 7.59 | 7.59 |
| 10 Dec 2024, 16:14 | 7.46 | 7.46 |
| 19 Nov 2024, 11:24 | 7.47 | 7.47 |
| 15 Oct 2024, 12:06 | 7.4 | 7.4 |
| 25 Sep 2024, 11:32 | 7.46 | 7.46 |
| 21 Aug 2024, 11:20 | 7.55 | 7.55 |
| 17 Jul 2024, 10:44 | 7.36 | 7.36 |
| 6 Jun 2024, 11:56 | 7.5 | 7.5 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.082 mg/l
Sampled 30 Jun 2026, 3 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Jun 2026, 10:10 | 0.082 | 0.082 mg/l |
| 24 Jun 2026, 11:46 | 0.092 | 0.092 mg/l |
| 21 May 2026, 10:28 | 0.31 | 0.31 mg/l |
| 1 May 2026, 10:52 | 0.06 | 0.06 mg/l |
| 21 Apr 2026, 10:09 | 0.044 | 0.044 mg/l |
| 7 Apr 2026, 09:46 | 0.11 | 0.11 mg/l |
| 16 Mar 2026, 11:45 | 0.11 | 0.11 mg/l |
| 19 Feb 2026, 10:15 | 0.31 | 0.31 mg/l |
| 5 Feb 2026, 11:00 | 0.17 | 0.17 mg/l |
| 22 Jan 2026, 11:28 | 0.32 | 0.32 mg/l |
| 15 Jan 2026, 13:34 | 0.13 | 0.13 mg/l |
| 13 Mar 2025, 10:22 | 0.25 | 0.25 mg/l |
| 21 Feb 2025, 10:46 | 0.39 | 0.39 mg/l |
| 23 Jan 2025, 11:05 | 0.36 | 0.36 mg/l |
| 10 Dec 2024, 16:14 | 0.12 | 0.12 mg/l |
| 19 Nov 2024, 11:24 | 0.065 | 0.065 mg/l |
| 15 Oct 2024, 12:06 | 0.1 | 0.1 mg/l |
| 25 Sep 2024, 11:32 | 0.16 | 0.16 mg/l |
| 21 Aug 2024, 11:20 | 0.097 | 0.097 mg/l |
| 17 Jul 2024, 10:44 | 0.3 | 0.3 mg/l |
| 6 Jun 2024, 11:56 | 0.15 | 0.15 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
7.14 mg/l
Sampled 30 Jun 2026, 3 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Jun 2026, 10:10 | 7.14 | 7.14 mg/l |
| 24 Jun 2026, 11:46 | 6.54 | 6.54 mg/l |
| 21 May 2026, 10:28 | 3.33 | 3.33 mg/l |
| 1 May 2026, 10:52 | 5.36 | 5.36 mg/l |
| 21 Apr 2026, 10:09 | 5.28 | 5.28 mg/l |
| 7 Apr 2026, 09:46 | 4.07 | 4.07 mg/l |
| 16 Mar 2026, 11:45 | 3.96 | 3.96 mg/l |
| 19 Feb 2026, 10:15 | 3.82 | 3.82 mg/l |
| 5 Feb 2026, 11:00 | 4.75 | 4.75 mg/l |
| 22 Jan 2026, 11:28 | 4.05 | 4.05 mg/l |
| 15 Jan 2026, 13:34 | 3.66 | 3.66 mg/l |
| 13 Mar 2025, 10:22 | 4.94 | 4.94 mg/l |
| 21 Feb 2025, 10:46 | 4.41 | 4.41 mg/l |
| 23 Jan 2025, 11:05 | 4.61 | 4.61 mg/l |
| 10 Dec 2024, 16:14 | 3.37 | 3.37 mg/l |
| 19 Nov 2024, 11:24 | 5.97 | 5.97 mg/l |
| 15 Oct 2024, 12:06 | 5.46 | 5.46 mg/l |
| 25 Sep 2024, 11:32 | 7 | 7 mg/l |
| 21 Aug 2024, 11:20 | 7.43 | 7.43 mg/l |
| 17 Jul 2024, 10:44 | 5.95 | 5.95 mg/l |
| 6 Jun 2024, 11:56 | 6.41 | 6.41 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.14 mg/l
Sampled 30 Jun 2026, 3 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Jun 2026, 10:10 | 0.14 | 0.14 mg/l |
| 24 Jun 2026, 11:46 | 0.12 | 0.12 mg/l |
| 21 May 2026, 10:28 | 0.056 | 0.056 mg/l |
| 1 May 2026, 10:52 | 0.065 | 0.065 mg/l |
| 21 Apr 2026, 10:09 | 0.074 | 0.074 mg/l |
| 7 Apr 2026, 09:46 | 0.074 | 0.074 mg/l |
| 16 Mar 2026, 11:45 | 0.058 | 0.058 mg/l |
| 19 Feb 2026, 10:15 | 0.051 | 0.051 mg/l |
| 5 Feb 2026, 11:00 | 0.049 | 0.049 mg/l |
| 22 Jan 2026, 11:28 | 0.057 | 0.057 mg/l |
| 15 Jan 2026, 13:34 | 0.043 | 0.043 mg/l |
| 13 Mar 2025, 10:22 | 0.11 | 0.11 mg/l |
| 21 Feb 2025, 10:46 | 0.078 | 0.078 mg/l |
| 23 Jan 2025, 11:05 | 0.083 | 0.083 mg/l |
| 10 Dec 2024, 16:14 | 0.053 | 0.053 mg/l |
| 19 Nov 2024, 11:24 | 0.58 | 0.58 mg/l |
| 15 Oct 2024, 12:06 | 0.35 | 0.35 mg/l |
| 25 Sep 2024, 11:32 | 0.59 | 0.59 mg/l |
| 21 Aug 2024, 11:20 | 0.59 | 0.59 mg/l |
| 17 Jul 2024, 10:44 | 0.47 | 0.47 mg/l |
| 6 Jun 2024, 11:56 | 0.26 | 0.26 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
595 µS/cm
Sampled 30 Jun 2026, 3 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Jun 2026, 10:10 | 595 | 595 µS/cm |
| 24 Jun 2026, 11:46 | 577 | 577 µS/cm |
| 21 May 2026, 10:28 | 327 | 327 µS/cm |
| 1 May 2026, 10:52 | 514 | 514 µS/cm |
| 21 Apr 2026, 10:09 | 471 | 471 µS/cm |
| 7 Apr 2026, 09:46 | 443 | 443 µS/cm |
| 16 Mar 2026, 11:45 | 422 | 422 µS/cm |
| 12 Mar 2026, 09:25 | 449 | 449 µS/cm |
| 19 Feb 2026, 10:15 | 465 | 465 µS/cm |
| 5 Feb 2026, 11:00 | 536 | 536 µS/cm |
| 22 Jan 2026, 11:28 | 388 | 388 µS/cm |
| 15 Jan 2026, 13:34 | 383 | 383 µS/cm |
| 13 Mar 2025, 10:22 | 481 | 481 µS/cm |
| 21 Feb 2025, 10:46 | 533 | 533 µS/cm |
| 23 Jan 2025, 11:05 | 505 | 505 µS/cm |
| 10 Dec 2024, 16:14 | 304 | 304 µS/cm |
| 19 Nov 2024, 11:24 | 474 | 474 µS/cm |
| 15 Oct 2024, 12:06 | 424 | 424 µS/cm |
| 25 Sep 2024, 11:32 | 515 | 515 µS/cm |
| 21 Aug 2024, 11:20 | 582 | 582 µS/cm |
| 17 Jul 2024, 10:44 | 493 | 493 µS/cm |
| 6 Jun 2024, 11:56 | 511 | 511 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 | 22 | Jun 2024 – Jun 2026 | 80.3% 30 Jun 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 22 | Jun 2024 – Jun 2026 | 7.48 mg/l 30 Jun 2026 |
| Temperature of Water 0076 | River water | 22 | Jun 2024 – Jun 2026 | 18.7 °C 30 Jun 2026 |
| pH 0061 | River water | 22 | Jun 2024 – Jun 2026 | 7.56 30 Jun 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 21 | Jun 2024 – Jun 2026 | 0.082 mg/l 30 Jun 2026 |
| Nitrate as N 0117 | River water | 21 | Jun 2024 – Jun 2026 | 7.14 mg/l 30 Jun 2026 |
| Orthophosphate, reactive as P 0180 | River water | 21 | Jun 2024 – Jun 2026 | 0.14 mg/l 30 Jun 2026 |
| Conductivity at 25 C 0077 | River water | 22 | Jun 2024 – Jun 2026 | 595 µS/cm 30 Jun 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 1 | May 2024 – May 2024 | below 0.001 µg/l 21 May 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | May 2024 – May 2024 | below 0.001 µg/l 21 May 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 1 | May 2024 – May 2024 | below 0.001 µg/l 21 May 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 1 | May 2024 – May 2024 | below 0.002 µg/l 21 May 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 1 | May 2024 – May 2024 | below 0.0005 µg/l 21 May 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 1 | May 2024 – May 2024 | below 0.001 µg/l 21 May 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 1 | May 2024 – May 2024 | below 0.0005 µg/l 21 May 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 1 | May 2024 – May 2024 | below 0.004 µg/l 21 May 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | May 2024 – May 2024 | below 0.005 µg/l 21 May 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 1 | May 2024 – May 2024 | below 0.0005 µg/l 21 May 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 1 | May 2024 – May 2024 | 0.0015 µg/l 21 May 2024 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 1 | May 2024 – May 2024 | below 0.001 µg/l 21 May 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 1 | May 2024 – May 2024 | below 0.0005 µg/l 21 May 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 21 | Jun 2024 – Jun 2026 | 65 mg/l 30 Jun 2026 |
| Ammonia un-ionised as N 0119 | River water | 21 | Jun 2024 – Jun 2026 | 0.00105 mg/l 30 Jun 2026 |
| BOD : 5 Day ATU 0085 | River water | 22 | Jul 2024 – Jun 2026 | below 1 mg/l 30 Jun 2026 |
| Chloroform :- {Trichloromethane} 3373 | River water | 31 | Oct 2023 – Aug 2026 | 0.33 µg/l 4 Aug 2026 |
| cis-Permethrin 9341 | River water | 10 | Oct 2023 – Jul 2026 | below 0.002 µg/l 14 Jul 2026 |
| Diazinon 0723 | River water | 12 | Oct 2023 – Jul 2026 | 0.025 µg/l 14 Jul 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 1 | May 2024 – May 2024 | below 0.001 µg/l 21 May 2024 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 1 | May 2024 – May 2024 | below 0.002 µg/l 21 May 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 1 | May 2024 – May 2024 | below 0.002 µg/l 21 May 2024 |
| Nitrite as N 0118 | River water | 21 | Jun 2024 – Jun 2026 | 0.056 mg/l 30 Jun 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 21 | Jun 2024 – Jun 2026 | 7.2 mg/l 30 Jun 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 1 | May 2024 – May 2024 | below 0.0005 µg/l 21 May 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 1 | May 2024 – May 2024 | below 0.0005 µg/l 21 May 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 1 | May 2024 – May 2024 | below 0.0005 µg/l 21 May 2024 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 1 | May 2024 – May 2024 | below 0.0005 µg/l 21 May 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 1 | May 2024 – May 2024 | below 0.0005 µg/l 21 May 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 1 | May 2024 – May 2024 | 0.0028 µg/l 21 May 2024 |
| Perfluorobutanoic acid 2995 | River water | 1 | May 2024 – May 2024 | 0.0046 µg/l 21 May 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 1 | May 2024 – May 2024 | 0.00054 µg/l 21 May 2024 |
| Perfluorodecanesulfonic acid 2969 | River water | 1 | May 2024 – May 2024 | below 0.002 µg/l 21 May 2024 |
| Perfluorodecanoic acid 8892 | River water | 1 | May 2024 – May 2024 | below 0.002 µg/l 21 May 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 1 | May 2024 – May 2024 | below 0.005 µg/l 21 May 2024 |
| Perfluorododecanoic acid 8894 | River water | 1 | May 2024 – May 2024 | below 0.002 µg/l 21 May 2024 |
| Perfluoroheptanesulfonic acid 2967 | River water | 1 | May 2024 – May 2024 | below 0.0005 µg/l 21 May 2024 |
| Perfluoroheptanoic acid 8889 | River water | 1 | May 2024 – May 2024 | 0.0023 µg/l 21 May 2024 |
| Perfluorohexanesulfonamide 2965 | River water | 1 | May 2024 – May 2024 | below 0.0005 µg/l 21 May 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 1 | May 2024 – May 2024 | below 0.0005 µg/l 21 May 2024 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 1 | May 2024 – May 2024 | 0.0014 µg/l 21 May 2024 |
| Perfluorohexanoic acid 8888 | River water | 1 | May 2024 – May 2024 | 0.0051 µg/l 21 May 2024 |
| Perfluorononanesulfonic acid 2963 | River water | 1 | May 2024 – May 2024 | below 0.0005 µg/l 21 May 2024 |
| Perfluorononanoic acid 8891 | River water | 1 | May 2024 – May 2024 | below 0.001 µg/l 21 May 2024 |
| Perfluorooctadecanoic acid 2962 | River water | 1 | May 2024 – May 2024 | below 0.002 µg/l 21 May 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | May 2024 – May 2024 | below 0.001 µg/l 21 May 2024 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 1 | May 2024 – May 2024 | 0.0021 µg/l 21 May 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 1 | May 2024 – May 2024 | 0.0031 µg/l 21 May 2024 |
| Perfluorooctanoic acid 8890 | River water | 1 | May 2024 – May 2024 | 0.0089 µg/l 21 May 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 1 | May 2024 – May 2024 | below 0.0005 µg/l 21 May 2024 |
| Perfluoropentanoic acid 8887 | River water | 1 | May 2024 – May 2024 | 0.0047 µg/l 21 May 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 1 | May 2024 – May 2024 | below 0.006 µg/l 21 May 2024 |
| Perfluorotridecanoic acid 2955 | River water | 1 | May 2024 – May 2024 | below 0.005 µg/l 21 May 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 1 | May 2024 – May 2024 | below 0.004 µg/l 21 May 2024 |
| Perfluoroundecanoic acid 8893 | River water | 1 | May 2024 – May 2024 | below 0.002 µg/l 21 May 2024 |
| Permethrin (cis- and trans-) 9823 | River water | 10 | Oct 2023 – Jul 2026 | below 0.003 µg/l 14 Jul 2026 |
| trans-Permethrin 9342 | River water | 10 | Oct 2023 – Jul 2026 | below 0.001 µg/l 14 Jul 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.