Foss at Castle Mill Lock
EA name: FOSS AT CASTLE MILL LOCK
Environment Agency sampling point NE-49100394 · 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
- 15 Apr 2026, 09:536 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
- 20 since 8 Dec 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 460600, 451300As published, to the nearest 100 m (so up to about 70 m out). Open in a map
- River, by its own name
- Foss
- River, by the map
- River FossPlaced on the river its name gives, 8 m from the line.
- Next gauge downstream
- York Foss Barrier On the Browney Dyke · 0.2 km along the river (the path rests on a repair to the map)Beside York Castle Mills Sluices: too close to say above or below.
- Nearest gauge upstream
- York James Street Trashscreen On the Tang Hall Beck · 1.2 km along the riverHuntington On the River Foss · 3.8 km along the river
- Why it was sampled
- Monitoring (national agency policy) (20 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
90%
Sampled 15 Apr 2026, 6 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 09:53 | 90 | 90% |
| 12 Feb 2026, 14:16 | 90.9 | 90.9% |
| 6 Oct 2025, 12:19 | 63.5 | 63.5% |
| 23 Jul 2025, 12:40 | 55.9 | 55.9% |
| 3 Mar 2025, 12:30 | 99.5 | 99.5% |
| 10 Feb 2025, 10:54 | 90 | 90% |
| 27 Jan 2025, 10:20 | 94.1 | 94.1% |
| 5 Dec 2024, 13:15 | 93.7 | 93.7% |
| 20 Nov 2024, 10:24 | 72.6 | 72.6% |
| 14 Oct 2024, 09:24 | 81.3 | 81.3% |
| 30 Sep 2024, 15:25 | 77.1 | 77.1% |
| 19 Aug 2024, 13:32 | 52.2 | 52.2% |
| 15 Jul 2024, 13:31 | 91.1 | 91.1% |
| 19 Jun 2024, 11:29 | 75.7 | 75.7% |
| 30 May 2024, 16:39 | 78.4 | 78.4% |
| 17 Apr 2024, 13:13 | 93.3 | 93.3% |
| 20 Mar 2024, 14:08 | 93.6 | 93.6% |
| 27 Feb 2024, 11:08 | 86.6 | 86.6% |
| 22 Jan 2024, 11:07 | 89.1 | 89.1% |
| 8 Dec 2023, 13:47 | 87.9 | 87.9% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.77 mg/l
Sampled 15 Apr 2026, 6 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 09:53 | 9.77 | 9.77 mg/l |
| 12 Feb 2026, 14:16 | 11.1 | 11.1 mg/l |
| 6 Oct 2025, 12:19 | 6.59 | 6.59 mg/l |
| 23 Jul 2025, 12:40 | 5.22 | 5.22 mg/l |
| 3 Mar 2025, 12:30 | 12.3 | 12.3 mg/l |
| 10 Feb 2025, 10:54 | 11.6 | 11.6 mg/l |
| 27 Jan 2025, 10:20 | 12.1 | 12.1 mg/l |
| 5 Dec 2024, 13:15 | 11.2 | 11.2 mg/l |
| 20 Nov 2024, 10:24 | 9.6 | 9.6 mg/l |
| 14 Oct 2024, 09:24 | 9.66 | 9.66 mg/l |
| 30 Sep 2024, 15:25 | 8.35 | 8.35 mg/l |
| 19 Aug 2024, 13:32 | 5.03 | 5.03 mg/l |
| 15 Jul 2024, 13:31 | 9.22 | 9.22 mg/l |
| 19 Jun 2024, 11:29 | 7.55 | 7.55 mg/l |
| 30 May 2024, 16:39 | 7.97 | 7.97 mg/l |
| 17 Apr 2024, 13:13 | 10.7 | 10.7 mg/l |
| 20 Mar 2024, 14:08 | 10.4 | 10.4 mg/l |
| 27 Feb 2024, 11:08 | 11 | 11 mg/l |
| 22 Jan 2024, 11:07 | 11 | 11 mg/l |
| 8 Dec 2023, 13:47 | 11 | 11 mg/l |
Water temperature
code 0076 · °C
11.6 °C
Sampled 15 Apr 2026, 6 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 09:53 | 11.6 | 11.6 °C |
| 12 Feb 2026, 14:16 | 6.6 | 6.6 °C |
| 6 Oct 2025, 12:19 | 13.6 | 13.6 °C |
| 23 Jul 2025, 12:40 | 18.5 | 18.5 °C |
| 3 Mar 2025, 12:30 | 6.1 | 6.1 °C |
| 10 Feb 2025, 10:54 | 4.7 | 4.7 °C |
| 27 Jan 2025, 10:20 | 4.8 | 4.8 °C |
| 5 Dec 2024, 13:15 | 7.4 | 7.4 °C |
| 20 Nov 2024, 10:24 | 3.6 | 3.6 °C |
| 14 Oct 2024, 09:24 | 7.8 | 7.8 °C |
| 30 Sep 2024, 15:25 | 11.7 | 11.7 °C |
| 19 Aug 2024, 13:32 | 17 | 17 °C |
| 15 Jul 2024, 13:31 | 14.7 | 14.7 °C |
| 19 Jun 2024, 11:29 | 15.4 | 15.4 °C |
| 30 May 2024, 16:39 | 14.5 | 14.5 °C |
| 17 Apr 2024, 13:13 | 9.3 | 9.3 °C |
| 20 Mar 2024, 14:08 | 10.6 | 10.6 °C |
| 27 Feb 2024, 11:08 | 5 | 5 °C |
| 22 Jan 2024, 11:07 | 6.2 | 6.2 °C |
| 8 Dec 2023, 13:47 | 5.8 | 5.8 °C |
pH
code 0061
8.06
Sampled 15 Apr 2026, 6 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 09:53 | 8.06 | 8.06 |
| 12 Feb 2026, 14:16 | 7.61 | 7.61 |
| 6 Oct 2025, 12:19 | 7.54 | 7.54 |
| 23 Jul 2025, 12:40 | 7.5 | 7.5 |
| 3 Mar 2025, 12:30 | 8.1 | 8.1 |
| 10 Feb 2025, 10:54 | 7.96 | 7.96 |
| 27 Jan 2025, 10:20 | 7.62 | 7.62 |
| 5 Dec 2024, 13:15 | 8 | 8 |
| 20 Nov 2024, 10:24 | 8.11 | 8.11 |
| 14 Oct 2024, 09:24 | 7.79 | 7.79 |
| 30 Sep 2024, 15:25 | 7.66 | 7.66 |
| 19 Aug 2024, 13:32 | 7.69 | 7.69 |
| 15 Jul 2024, 13:31 | 7.93 | 7.93 |
| 19 Jun 2024, 11:29 | 8.08 | 8.08 |
| 30 May 2024, 16:39 | 7.48 | 7.48 |
| 17 Apr 2024, 13:13 | 8.07 | 8.07 |
| 20 Mar 2024, 14:08 | 8 | 8 |
| 27 Feb 2024, 11:08 | 7.85 | 7.85 |
| 22 Jan 2024, 11:07 | 7.84 | 7.84 |
| 8 Dec 2023, 13:47 | 7.68 | 7.68 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.077 mg/l
Sampled 15 Apr 2026, 6 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 09:53 | 0.077 | 0.077 mg/l |
| 12 Feb 2026, 14:16 | 0.086 | 0.086 mg/l |
| 6 Oct 2025, 12:19 | 0.34 | 0.34 mg/l |
| 23 Jul 2025, 12:40 | 0.25 | 0.25 mg/l |
| 3 Mar 2025, 12:30 | 0.099 | 0.099 mg/l |
| 10 Feb 2025, 10:54 | 2.2 | 2.2 mg/l |
| 27 Jan 2025, 10:20 | 0.16 | 0.16 mg/l |
| 5 Dec 2024, 13:15 | 0.065 | 0.065 mg/l |
| 20 Nov 2024, 10:24 | 0.056 | 0.056 mg/l |
| 14 Oct 2024, 09:24 | 0.055 | 0.055 mg/l |
| 30 Sep 2024, 15:25 | 0.076 | 0.076 mg/l |
| 19 Aug 2024, 13:32 | 0.077 | 0.077 mg/l |
| 15 Jul 2024, 13:31 | 0.055 | 0.055 mg/l |
| 19 Jun 2024, 11:29 | 0.2 | 0.2 mg/l |
| 30 May 2024, 16:39 | 0.2 | 0.2 mg/l |
| 17 Apr 2024, 13:13 | 0.11 | 0.11 mg/l |
| 20 Mar 2024, 14:08 | 0.12 | 0.12 mg/l |
| 27 Feb 2024, 11:08 | 0.13 | 0.13 mg/l |
| 22 Jan 2024, 11:07 | 0.72 | 0.72 mg/l |
| 8 Dec 2023, 13:47 | 0.12 | 0.12 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
8.56 mg/l
Sampled 15 Apr 2026, 6 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 09:53 | 8.56 | 8.56 mg/l |
| 12 Feb 2026, 14:16 | 5.08 | 5.08 mg/l |
| 6 Oct 2025, 12:19 | 10.8 | 10.8 mg/l |
| 23 Jul 2025, 12:40 | 6.18 | 6.18 mg/l |
| 3 Mar 2025, 12:30 | 8.06 | 8.06 mg/l |
| 10 Feb 2025, 10:54 | 8.75 | 8.75 mg/l |
| 27 Jan 2025, 10:20 | 5.57 | 5.57 mg/l |
| 5 Dec 2024, 13:15 | 7.46 | 7.46 mg/l |
| 20 Nov 2024, 10:24 | 9.96 | 9.96 mg/l |
| 14 Oct 2024, 09:24 | 9.95 | 9.95 mg/l |
| 30 Sep 2024, 15:25 | 12.9 | 12.9 mg/l |
| 19 Aug 2024, 13:32 | 7.02 | 7.02 mg/l |
| 15 Jul 2024, 13:31 | 2.48 | 2.48 mg/l |
| 19 Jun 2024, 11:29 | 7.34 | 7.34 mg/l |
| 30 May 2024, 16:39 | 10.9 | 10.9 mg/l |
| 17 Apr 2024, 13:13 | 6.14 | 6.14 mg/l |
| 20 Mar 2024, 14:08 | 5.55 | 5.55 mg/l |
| 27 Feb 2024, 11:08 | 5.56 | 5.56 mg/l |
| 22 Jan 2024, 11:07 | 7.3 | 7.3 mg/l |
| 8 Dec 2023, 13:47 | 3.88 | 3.88 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.17 mg/l
Sampled 15 Apr 2026, 6 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 09:53 | 0.17 | 0.17 mg/l |
| 12 Feb 2026, 14:16 | 0.14 | 0.14 mg/l |
| 6 Oct 2025, 12:19 | 0.5 | 0.5 mg/l |
| 23 Jul 2025, 12:40 | 0.34 | 0.34 mg/l |
| 3 Mar 2025, 12:30 | 0.086 | 0.086 mg/l |
| 10 Feb 2025, 10:54 | 0.17 | 0.17 mg/l |
| 27 Jan 2025, 10:20 | 0.072 | 0.072 mg/l |
| 5 Dec 2024, 13:15 | 0.084 | 0.084 mg/l |
| 20 Nov 2024, 10:24 | 0.16 | 0.16 mg/l |
| 14 Oct 2024, 09:24 | 0.14 | 0.14 mg/l |
| 30 Sep 2024, 15:25 | 0.16 | 0.16 mg/l |
| 19 Aug 2024, 13:32 | 0.16 | 0.16 mg/l |
| 15 Jul 2024, 13:31 | 0.097 | 0.097 mg/l |
| 19 Jun 2024, 11:29 | 0.16 | 0.16 mg/l |
| 30 May 2024, 16:39 | 0.11 | 0.11 mg/l |
| 17 Apr 2024, 13:13 | 0.091 | 0.091 mg/l |
| 20 Mar 2024, 14:08 | 0.084 | 0.084 mg/l |
| 27 Feb 2024, 11:08 | 0.088 | 0.088 mg/l |
| 22 Jan 2024, 11:07 | 0.073 | 0.073 mg/l |
| 8 Dec 2023, 13:47 | 0.12 | 0.12 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
818 µS/cm
Sampled 15 Apr 2026, 6 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 09:53 | 818 | 818 µS/cm |
| 12 Feb 2026, 14:16 | 488 | 488 µS/cm |
| 6 Oct 2025, 12:19 | 733 | 733 µS/cm |
| 23 Jul 2025, 12:40 | 596 | 596 µS/cm |
| 3 Mar 2025, 12:30 | 811 | 811 µS/cm |
| 10 Feb 2025, 10:54 | 898 | 898 µS/cm |
| 27 Jan 2025, 10:20 | 641 | 641 µS/cm |
| 5 Dec 2024, 13:15 | 865 | 865 µS/cm |
| 20 Nov 2024, 10:24 | 540 | 540 µS/cm |
| 14 Oct 2024, 09:24 | 688 | 688 µS/cm |
| 30 Sep 2024, 15:25 | 648 | 648 µS/cm |
| 19 Aug 2024, 13:32 | 810 | 810 µS/cm |
| 15 Jul 2024, 13:31 | 451 | 451 µS/cm |
| 19 Jun 2024, 11:29 | 694 | 694 µS/cm |
| 30 May 2024, 16:39 | 599 | 599 µS/cm |
| 17 Apr 2024, 13:13 | 702 | 702 µS/cm |
| 20 Mar 2024, 14:08 | 724 | 724 µS/cm |
| 27 Feb 2024, 11:08 | 678 | 678 µS/cm |
| 22 Jan 2024, 11:07 | 900 | 900 µS/cm |
| 8 Dec 2023, 13:47 | 341 | 341 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 | 20 | Dec 2023 – Apr 2026 | 90% 15 Apr 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 20 | Dec 2023 – Apr 2026 | 9.77 mg/l 15 Apr 2026 |
| Temperature of Water 0076 | River water | 20 | Dec 2023 – Apr 2026 | 11.6 °C 15 Apr 2026 |
| pH 0061 | River water | 20 | Dec 2023 – Apr 2026 | 8.06 15 Apr 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 20 | Dec 2023 – Apr 2026 | 0.077 mg/l 15 Apr 2026 |
| Nitrate as N 0117 | River water | 20 | Dec 2023 – Apr 2026 | 8.56 mg/l 15 Apr 2026 |
| Orthophosphate, reactive as P 0180 | River water | 20 | Dec 2023 – Apr 2026 | 0.17 mg/l 15 Apr 2026 |
| Conductivity at 25 C 0077 | River water | 20 | Dec 2023 – Apr 2026 | 818 µS/cm 15 Apr 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 | 0.0059 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 | 20 | Dec 2023 – Apr 2026 | 210 mg/l 15 Apr 2026 |
| Ammonia un-ionised as N 0119 | River water | 20 | Dec 2023 – Apr 2026 | 0.00158 mg/l 15 Apr 2026 |
| BOD : 5 Day ATU 0085 | River water | 18 | Feb 2024 – Apr 2026 | 2 mg/l 15 Apr 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 | 20 | Dec 2023 – Apr 2026 | 0.039 mg/l 15 Apr 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 20 | Dec 2023 – Apr 2026 | 8.6 mg/l 15 Apr 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 | 0.0013 µg/l 5 Dec 2024 |
| Perfluorobutanoic acid 2995 | River water | 1 | Dec 2024 – Dec 2024 | 0.0023 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 |
| Perfluoroheptanoic acid 8889 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 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 |
| Perfluorohexanoic acid 8888 | River water | 1 | Dec 2024 – Dec 2024 | 0.0011 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 | 0.00077 µg/l 5 Dec 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 1 | Dec 2024 – Dec 2024 | 0.00077 µg/l 5 Dec 2024 |
| Perfluorooctanoic acid 8890 | River water | 1 | Dec 2024 – Dec 2024 | 0.00098 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.