River Darwen below Jack Keys Reservoir
EA name: RIVER DARWEN BELOW JACK KEYS RESERVOIR
Environment Agency sampling point NW-88003533 · 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
- 11 May 2026, 12:285 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone). Not sampled since, as far as the archive shows: the Environment Agency was asked up to 30 Sep 2026 and had nothing newer.
- Samples banked
- 23 since 18 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 370177, 420801As published, to the nearest 1 m. Open in a map
- River, by its own name
- Darwen
- River, by the map
- River DarwenPlaced on the river its name gives, 1 m from the line.
- Next gauge downstream
- Darwen Clough Street Overflow On the River Darwen · 0.2 km along the river
- Why it was sampled
- Monitoring (national agency policy) (23 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
98.9%
Sampled 11 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 May 2026, 12:28 | 98.9 | 98.9% |
| 30 Apr 2026, 13:53 | 99.2 | 99.2% |
| 16 Mar 2026, 10:01 | 99.1 | 99.1% |
| 12 Feb 2026, 13:42 | 98.3 | 98.3% |
| 7 Jan 2026, 09:38 | 102.7 | 102.7% |
| 13 Mar 2025, 10:16 | 104 | 104% |
| 10 Feb 2025, 10:18 | 100.7 | 100.7% |
| 22 Jan 2025, 13:02 | 101.5 | 101.5% |
| 5 Dec 2024, 10:50 | 101.1 | 101.1% |
| 19 Nov 2024, 13:04 | 100.7 | 100.7% |
| 15 Oct 2024, 11:07 | 99.9 | 99.9% |
| 19 Sep 2024, 13:40 | 100.3 | 100.3% |
| 28 Aug 2024, 09:45 | 98.6 | 98.6% |
| 17 Jul 2024, 09:07 | 97.3 | 97.3% |
| 20 Jun 2024, 13:30 | 99.1 | 99.1% |
| 13 May 2024, 09:15 | 97.9 | 97.9% |
| 15 Apr 2024, 11:54 | 102.9 | 102.9% |
| 20 Mar 2024, 11:02 | 103.8 | 103.8% |
| 21 Feb 2024, 11:35 | 102.4 | 102.4% |
| 30 Jan 2024, 10:48 | 101.4 | 101.4% |
| 6 Dec 2023, 12:59 | 99.6 | 99.6% |
| 22 Nov 2023, 09:12 | 100.1 | 100.1% |
| 18 Oct 2023, 12:58 | 99.9 | 99.9% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.3 mg/l
Sampled 11 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 May 2026, 12:28 | 11.3 | 11.3 mg/l |
| 30 Apr 2026, 13:53 | 10.8 | 10.8 mg/l |
| 16 Mar 2026, 10:01 | 12.1 | 12.1 mg/l |
| 12 Feb 2026, 13:42 | 12 | 12 mg/l |
| 7 Jan 2026, 09:38 | 12.7 | 12.7 mg/l |
| 13 Mar 2025, 10:16 | 12.8 | 12.8 mg/l |
| 10 Feb 2025, 10:18 | 12.6 | 12.6 mg/l |
| 22 Jan 2025, 13:02 | 12.6 | 12.6 mg/l |
| 5 Dec 2024, 10:50 | 12 | 12 mg/l |
| 19 Nov 2024, 13:04 | 12.2 | 12.2 mg/l |
| 15 Oct 2024, 11:07 | 11.3 | 11.3 mg/l |
| 19 Sep 2024, 13:40 | 10.5 | 10.5 mg/l |
| 28 Aug 2024, 09:45 | 10.3 | 10.3 mg/l |
| 17 Jul 2024, 09:07 | 10.3 | 10.3 mg/l |
| 20 Jun 2024, 13:30 | 10.3 | 10.3 mg/l |
| 13 May 2024, 09:15 | 10.5 | 10.5 mg/l |
| 15 Apr 2024, 11:54 | 11.9 | 11.9 mg/l |
| 20 Mar 2024, 11:02 | 11.9 | 11.9 mg/l |
| 21 Feb 2024, 11:35 | 12.2 | 12.2 mg/l |
| 30 Jan 2024, 10:48 | 12.3 | 12.3 mg/l |
| 6 Dec 2023, 12:59 | 12.6 | 12.6 mg/l |
| 22 Nov 2023, 09:12 | 11.6 | 11.6 mg/l |
| 18 Oct 2023, 12:58 | 11.1 | 11.1 mg/l |
Water temperature
code 0076 · °C
9.5 °C
Sampled 11 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 May 2026, 12:28 | 9.5 | 9.5 °C |
| 30 Apr 2026, 13:53 | 11.3 | 11.3 °C |
| 16 Mar 2026, 10:01 | 6.8 | 6.8 °C |
| 12 Feb 2026, 13:42 | 6.8 | 6.8 °C |
| 7 Jan 2026, 09:38 | 6.1 | 6.1 °C |
| 13 Mar 2025, 10:16 | 6.3 | 6.3 °C |
| 10 Feb 2025, 10:18 | 5.8 | 5.8 °C |
| 22 Jan 2025, 13:02 | 6 | 6 °C |
| 5 Dec 2024, 10:50 | 7.9 | 7.9 °C |
| 19 Nov 2024, 13:04 | 7.1 | 7.1 °C |
| 15 Oct 2024, 11:07 | 9.9 | 9.9 °C |
| 19 Sep 2024, 13:40 | 13 | 13 °C |
| 28 Aug 2024, 09:45 | 13.3 | 13.3 °C |
| 17 Jul 2024, 09:07 | 12.5 | 12.5 °C |
| 20 Jun 2024, 13:30 | 13.3 | 13.3 °C |
| 13 May 2024, 09:15 | 12.1 | 12.1 °C |
| 15 Apr 2024, 11:54 | 8.8 | 8.8 °C |
| 20 Mar 2024, 11:02 | 9.2 | 9.2 °C |
| 21 Feb 2024, 11:35 | 7.6 | 7.6 °C |
| 30 Jan 2024, 10:48 | 7 | 7 °C |
| 6 Dec 2023, 12:59 | 5.3 | 5.3 °C |
| 22 Nov 2023, 09:12 | 8.9 | 8.9 °C |
| 18 Oct 2023, 12:58 | 10.4 | 10.4 °C |
pH
code 0061
8.15
Sampled 11 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 May 2026, 12:28 | 8.15 | 8.15 |
| 30 Apr 2026, 13:53 | 7.98 | 7.98 |
| 16 Mar 2026, 10:01 | 8.08 | 8.08 |
| 12 Feb 2026, 13:42 | 7.77 | 7.77 |
| 7 Jan 2026, 09:38 | 7.89 | 7.89 |
| 13 Mar 2025, 10:16 | 8.02 | 8.02 |
| 10 Feb 2025, 10:18 | 8.05 | 8.05 |
| 22 Jan 2025, 13:02 | 7.98 | 7.98 |
| 5 Dec 2024, 10:50 | 7.73 | 7.73 |
| 19 Nov 2024, 13:04 | 8.03 | 8.03 |
| 15 Oct 2024, 11:07 | 7.98 | 7.98 |
| 19 Sep 2024, 13:40 | 8.15 | 8.15 |
| 28 Aug 2024, 09:45 | 8.22 | 8.22 |
| 17 Jul 2024, 09:07 | 8.04 | 8.04 |
| 20 Jun 2024, 13:30 | 8.06 | 8.06 |
| 13 May 2024, 09:15 | 8.04 | 8.04 |
| 15 Apr 2024, 11:54 | 8.03 | 8.03 |
| 20 Mar 2024, 11:02 | 7.96 | 7.96 |
| 21 Feb 2024, 11:35 | 8.06 | 8.06 |
| 30 Jan 2024, 10:48 | 7.97 | 7.97 |
| 6 Dec 2023, 12:59 | 7.94 | 7.94 |
| 22 Nov 2023, 09:12 | 7.77 | 7.77 |
| 18 Oct 2023, 12:58 | 7.83 | 7.83 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.062 mg/l
Sampled 11 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 May 2026, 12:28 | 0.062 | 0.062 mg/l |
| 30 Apr 2026, 13:53 | 0.074 | 0.074 mg/l |
| 16 Mar 2026, 10:01 | 0.12 | 0.12 mg/l |
| 12 Feb 2026, 13:42 | 0.082 | 0.082 mg/l |
| 7 Jan 2026, 09:38 | 0.24 | 0.24 mg/l |
| 13 Mar 2025, 10:16 | 0.063 | 0.063 mg/l |
| 10 Feb 2025, 10:18 | 0.11 | 0.11 mg/l |
| 22 Jan 2025, 13:02 | 0.16 | 0.16 mg/l |
| 5 Dec 2024, 10:50 | 0.056 | 0.056 mg/l |
| 19 Nov 2024, 13:04 | 0.053 | 0.053 mg/l |
| 15 Oct 2024, 11:07 | 0.044 | 0.044 mg/l |
| 19 Sep 2024, 13:40 | 0.052 | 0.052 mg/l |
| 28 Aug 2024, 09:45 | 0.041 | 0.041 mg/l |
| 17 Jul 2024, 09:07 | 0.053 | 0.053 mg/l |
| 20 Jun 2024, 13:30 | 0.043 | 0.043 mg/l |
| 13 May 2024, 09:15 | 0.072 | 0.072 mg/l |
| 15 Apr 2024, 11:54 | 0.14 | 0.14 mg/l |
| 20 Mar 2024, 11:02 | 0.11 | 0.11 mg/l |
| 21 Feb 2024, 11:35 | 0.059 | 0.059 mg/l |
| 30 Jan 2024, 10:48 | 0.055 | 0.055 mg/l |
| 6 Dec 2023, 12:59 | 0.095 | 0.095 mg/l |
| 22 Nov 2023, 09:12 | 0.053 | 0.053 mg/l |
| 18 Oct 2023, 12:58 | 0.053 | 0.053 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.784 mg/l
Sampled 11 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 May 2026, 12:28 | 0.784 | 0.784 mg/l |
| 30 Apr 2026, 13:53 | 0.665 | 0.665 mg/l |
| 16 Mar 2026, 10:01 | 0.991 | 0.991 mg/l |
| 12 Feb 2026, 13:42 | 1.29 | 1.29 mg/l |
| 7 Jan 2026, 09:38 | 1.48 | 1.48 mg/l |
| 13 Mar 2025, 10:16 | 1.1 | 1.1 mg/l |
| 10 Feb 2025, 10:18 | 1.19 | 1.19 mg/l |
| 22 Jan 2025, 13:02 | 1.38 | 1.38 mg/l |
| 5 Dec 2024, 10:50 | 0.904 | 0.904 mg/l |
| 19 Nov 2024, 13:04 | 0.954 | 0.954 mg/l |
| 15 Oct 2024, 11:07 | 0.756 | 0.756 mg/l |
| 19 Sep 2024, 13:40 | 0.666 | 0.666 mg/l |
| 28 Aug 2024, 09:45 | 0.676 | 0.676 mg/l |
| 17 Jul 2024, 09:07 | 0.706 | 0.706 mg/l |
| 20 Jun 2024, 13:30 | 0.676 | 0.676 mg/l |
| 13 May 2024, 09:15 | 0.944 | 0.944 mg/l |
| 15 Apr 2024, 11:54 | 0.852 | 0.852 mg/l |
| 20 Mar 2024, 11:02 | 0.916 | 0.916 mg/l |
| 21 Feb 2024, 11:35 | 0.664 | 0.664 mg/l |
| 30 Jan 2024, 10:48 | 0.991 | 0.991 mg/l |
| 6 Dec 2023, 12:59 | 1.29 | 1.29 mg/l |
| 22 Nov 2023, 09:12 | 1.09 | 1.09 mg/l |
| 18 Oct 2023, 12:58 | 0.926 | 0.926 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.012 mg/l
Sampled 11 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 May 2026, 12:28 | 0.012 | 0.012 mg/l |
| 30 Apr 2026, 13:53 | 0.011 | 0.011 mg/l |
| 16 Mar 2026, 10:01 | 0.028 | 0.028 mg/l |
| 12 Feb 2026, 13:42 | 0.031 | 0.031 mg/l |
| 7 Jan 2026, 09:38 | 0.022 | 0.022 mg/l |
| 13 Mar 2025, 10:16 | <0.01 | below 0.01 mg/l (not detected above this) |
| 10 Feb 2025, 10:18 | 0.016 | 0.016 mg/l |
| 22 Jan 2025, 13:02 | 0.011 | 0.011 mg/l |
| 5 Dec 2024, 10:50 | 0.03 | 0.03 mg/l |
| 19 Nov 2024, 13:04 | 0.013 | 0.013 mg/l |
| 15 Oct 2024, 11:07 | 0.027 | 0.027 mg/l |
| 19 Sep 2024, 13:40 | 0.048 | 0.048 mg/l |
| 28 Aug 2024, 09:45 | 0.021 | 0.021 mg/l |
| 17 Jul 2024, 09:07 | <0.01 | below 0.01 mg/l (not detected above this) |
| 20 Jun 2024, 13:30 | 0.01 | 0.01 mg/l |
| 13 May 2024, 09:15 | 0.012 | 0.012 mg/l |
| 15 Apr 2024, 11:54 | 0.019 | 0.019 mg/l |
| 20 Mar 2024, 11:02 | 0.018 | 0.018 mg/l |
| 21 Feb 2024, 11:35 | 0.045 | 0.045 mg/l |
| 30 Jan 2024, 10:48 | 0.03 | 0.03 mg/l |
| 6 Dec 2023, 12:59 | 0.016 | 0.016 mg/l |
| 22 Nov 2023, 09:12 | 0.016 | 0.016 mg/l |
| 18 Oct 2023, 12:58 | 0.026 | 0.026 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
390 µS/cm
Sampled 11 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 May 2026, 12:28 | 390 | 390 µS/cm |
| 30 Apr 2026, 13:53 | 385 | 385 µS/cm |
| 16 Mar 2026, 10:01 | 286 | 286 µS/cm |
| 12 Feb 2026, 13:42 | 223 | 223 µS/cm |
| 7 Jan 2026, 09:38 | 368 | 368 µS/cm |
| 13 Mar 2025, 10:16 | 376 | 376 µS/cm |
| 10 Feb 2025, 10:18 | 382 | 382 µS/cm |
| 22 Jan 2025, 13:02 | 338 | 338 µS/cm |
| 5 Dec 2024, 10:50 | 196 | 196 µS/cm |
| 19 Nov 2024, 13:04 | 370 | 370 µS/cm |
| 15 Oct 2024, 11:07 | 322 | 322 µS/cm |
| 19 Sep 2024, 13:40 | 400 | 400 µS/cm |
| 28 Aug 2024, 09:45 | 307 | 307 µS/cm |
| 17 Jul 2024, 09:07 | 373 | 373 µS/cm |
| 20 Jun 2024, 13:30 | 357 | 357 µS/cm |
| 13 May 2024, 09:15 | 387 | 387 µS/cm |
| 15 Apr 2024, 11:54 | 249 | 249 µS/cm |
| 20 Mar 2024, 11:02 | 239 | 239 µS/cm |
| 21 Feb 2024, 11:35 | 125 | 125 µS/cm |
| 30 Jan 2024, 10:48 | 259 | 259 µS/cm |
| 6 Dec 2023, 12:59 | 280 | 280 µS/cm |
| 22 Nov 2023, 09:12 | 250 | 250 µS/cm |
| 18 Oct 2023, 12:58 | 310 | 310 µS/cm |
Everything measured here
59 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 59 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 23 | Oct 2023 – May 2026 | 98.9% 11 May 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 23 | Oct 2023 – May 2026 | 11.3 mg/l 11 May 2026 |
| Temperature of Water 0076 | River water | 23 | Oct 2023 – May 2026 | 9.5 °C 11 May 2026 |
| pH 0061 | River water | 23 | Oct 2023 – May 2026 | 8.15 11 May 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 23 | Oct 2023 – May 2026 | 0.062 mg/l 11 May 2026 |
| Nitrate as N 0117 | River water | 23 | Oct 2023 – May 2026 | 0.784 mg/l 11 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 23 | Oct 2023 – May 2026 | 0.012 mg/l 11 May 2026 |
| Conductivity at 25 C 0077 | River water | 23 | Oct 2023 – May 2026 | 390 µS/cm 11 May 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 5 Dec 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 5 Dec 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 5 Dec 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 5 Dec 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 5 Dec 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 5 Dec 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 5 Dec 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 1 | Dec 2024 – Dec 2024 | below 0.004 µg/l 5 Dec 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Dec 2024 – Dec 2024 | below 0.005 µg/l 5 Dec 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 5 Dec 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 5 Dec 2024 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 5 Dec 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 5 Dec 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 23 | Oct 2023 – May 2026 | 140 mg/l 11 May 2026 |
| Ammonia un-ionised as N 0119 | River water | 23 | Oct 2023 – May 2026 | 0.00109 mg/l 11 May 2026 |
| BOD : 5 Day ATU 0085 | River water | 17 | Feb 2024 – May 2026 | 1.3 mg/l 11 May 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 5 Dec 2024 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 5 Dec 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 5 Dec 2024 |
| Nitrite as N 0118 | River water | 23 | Oct 2023 – May 2026 | 0.0059 mg/l 11 May 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 23 | Oct 2023 – May 2026 | 0.79 mg/l 11 May 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 5 Dec 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 5 Dec 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 5 Dec 2024 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 5 Dec 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 5 Dec 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 5 Dec 2024 |
| Perfluorobutanoic acid 2995 | River water | 1 | Dec 2024 – Dec 2024 | 0.0017 µg/l 5 Dec 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 5 Dec 2024 |
| Perfluorodecanesulfonic acid 2969 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 5 Dec 2024 |
| Perfluorodecanoic acid 8892 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 5 Dec 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 1 | Dec 2024 – Dec 2024 | below 0.005 µg/l 5 Dec 2024 |
| Perfluorododecanoic acid 8894 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 5 Dec 2024 |
| Perfluoroheptanesulfonic acid 2967 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 5 Dec 2024 |
| Perfluorohexanesulfonamide 2965 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 5 Dec 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 5 Dec 2024 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 5 Dec 2024 |
| Perfluorohexanoic acid 8888 | River water | 1 | Dec 2024 – Dec 2024 | 0.0021 µg/l 5 Dec 2024 |
| Perfluorononanesulfonic acid 2963 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 5 Dec 2024 |
| Perfluorononanoic acid 8891 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 5 Dec 2024 |
| Perfluorooctadecanoic acid 2962 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 5 Dec 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 5 Dec 2024 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 1 | Dec 2024 – Dec 2024 | 0.00065 µg/l 5 Dec 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 1 | Dec 2024 – Dec 2024 | 0.00064 µg/l 5 Dec 2024 |
| Perfluorooctanoic acid 8890 | River water | 1 | Dec 2024 – Dec 2024 | 0.28 µg/l 5 Dec 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 5 Dec 2024 |
| Perfluoropentanoic acid 8887 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 5 Dec 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 1 | Dec 2024 – Dec 2024 | below 0.006 µg/l 5 Dec 2024 |
| Perfluorotridecanoic acid 2955 | River water | 1 | Dec 2024 – Dec 2024 | below 0.005 µg/l 5 Dec 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 1 | Dec 2024 – Dec 2024 | below 0.004 µg/l 5 Dec 2024 |
| Perfluoroundecanoic acid 8893 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 5 Dec 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.