Hall Dike upstream of Meltham sewage treatment works
EA name: HALL DIKE U/S MELTHAM STW
Environment Agency sampling point NE-49500340 · 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 Jun 2026, 12:214 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 24 since 17 Jul 2024 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 411053, 411382As published, to the nearest 1 m. Open in a map
- River, by its own name
- Hall Dike
- River, by the map
- Hall DikePlaced on the river its name gives, 5 m from the line.
- Next gauge downstream
- Queen's Mill On the River Holme · 9.1 km along the river
- Why it was sampled
- Monitoring (national agency policy) (24 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
96.5%
Sampled 4 Jun 2026, 4 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Jun 2026, 12:21 | 96.5 | 96.5% |
| 15 May 2026, 10:08 | 100.8 | 100.8% |
| 14 Apr 2026, 11:21 | 103 | 103% |
| 17 Mar 2026, 09:18 | 95.2 | 95.2% |
| 3 Feb 2026, 11:17 | 101.9 | 101.9% |
| 6 Jan 2026, 11:21 | 98.6 | 98.6% |
| 8 Dec 2025, 10:05 | 99.1 | 99.1% |
| 3 Nov 2025, 11:56 | 100.4 | 100.4% |
| 2 Oct 2025, 10:04 | 100 | 100% |
| 12 Sep 2025, 08:58 | 100.8 | 100.8% |
| 1 Aug 2025, 09:17 | 102.1 | 102.1% |
| 10 Jul 2025, 11:02 | 101.3 | 101.3% |
| 3 Jun 2025, 10:08 | 99.1 | 99.1% |
| 12 May 2025, 13:28 | 100.5 | 100.5% |
| 2 Apr 2025, 12:23 | 102 | 102% |
| 12 Mar 2025, 10:18 | 102.1 | 102.1% |
| 19 Feb 2025, 10:29 | 100.4 | 100.4% |
| 24 Jan 2025, 10:36 | 101.7 | 101.7% |
| 4 Dec 2024, 12:34 | 100 | 100% |
| 19 Nov 2024, 12:16 | 113.2 | 113.2% |
| 17 Oct 2024, 10:23 | 101.2 | 101.2% |
| 30 Sep 2024, 11:54 | 99.5 | 99.5% |
| 19 Aug 2024, 13:08 | 99.7 | 99.7% |
| 17 Jul 2024, 13:07 | 100.5 | 100.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.1 mg/l
Sampled 4 Jun 2026, 4 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Jun 2026, 12:21 | 10.1 | 10.1 mg/l |
| 15 May 2026, 10:08 | 11.8 | 11.8 mg/l |
| 14 Apr 2026, 11:21 | 12.2 | 12.2 mg/l |
| 17 Mar 2026, 09:18 | 11.2 | 11.2 mg/l |
| 3 Feb 2026, 11:17 | 13 | 13 mg/l |
| 6 Jan 2026, 11:21 | 13.2 | 13.2 mg/l |
| 8 Dec 2025, 10:05 | 11.6 | 11.6 mg/l |
| 3 Nov 2025, 11:56 | 11.1 | 11.1 mg/l |
| 2 Oct 2025, 10:04 | 10.8 | 10.8 mg/l |
| 12 Sep 2025, 08:58 | 11 | 11 mg/l |
| 1 Aug 2025, 09:17 | 10.4 | 10.4 mg/l |
| 10 Jul 2025, 11:02 | 9.91 | 9.91 mg/l |
| 3 Jun 2025, 10:08 | 10.7 | 10.7 mg/l |
| 12 May 2025, 13:28 | 10.4 | 10.4 mg/l |
| 2 Apr 2025, 12:23 | 11.8 | 11.8 mg/l |
| 12 Mar 2025, 10:18 | 13.1 | 13.1 mg/l |
| 19 Feb 2025, 10:29 | 13.5 | 13.5 mg/l |
| 24 Jan 2025, 10:36 | 12.6 | 12.6 mg/l |
| 4 Dec 2024, 12:34 | 12.1 | 12.1 mg/l |
| 19 Nov 2024, 12:16 | 14.4 | 14.4 mg/l |
| 17 Oct 2024, 10:23 | 11.1 | 11.1 mg/l |
| 30 Sep 2024, 11:54 | 10.9 | 10.9 mg/l |
| 19 Aug 2024, 13:08 | 10.2 | 10.2 mg/l |
| 17 Jul 2024, 13:07 | 10.2 | 10.2 mg/l |
Water temperature
code 0076 · °C
13 °C
Sampled 4 Jun 2026, 4 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Jun 2026, 12:21 | 13 | 13 °C |
| 15 May 2026, 10:08 | 8.4 | 8.4 °C |
| 14 Apr 2026, 11:21 | 8 | 8 °C |
| 17 Mar 2026, 09:18 | 8.1 | 8.1 °C |
| 3 Feb 2026, 11:17 | 5.1 | 5.1 °C |
| 6 Jan 2026, 11:21 | 3.2 | 3.2 °C |
| 8 Dec 2025, 10:05 | 8.3 | 8.3 °C |
| 3 Nov 2025, 11:56 | 10.8 | 10.8 °C |
| 2 Oct 2025, 10:04 | 12 | 12 °C |
| 12 Sep 2025, 08:58 | 11.2 | 11.2 °C |
| 1 Aug 2025, 09:17 | 14.3 | 14.3 °C |
| 10 Jul 2025, 11:02 | 16.3 | 16.3 °C |
| 3 Jun 2025, 10:08 | 11.8 | 11.8 °C |
| 12 May 2025, 13:28 | 13.9 | 13.9 °C |
| 2 Apr 2025, 12:23 | 8.9 | 8.9 °C |
| 12 Mar 2025, 10:18 | 4.7 | 4.7 °C |
| 19 Feb 2025, 10:29 | 3.1 | 3.1 °C |
| 24 Jan 2025, 10:36 | 6 | 6 °C |
| 4 Dec 2024, 12:34 | 7.2 | 7.2 °C |
| 19 Nov 2024, 12:16 | 5.1 | 5.1 °C |
| 17 Oct 2024, 10:23 | 11.2 | 11.2 °C |
| 30 Sep 2024, 11:54 | 11.1 | 11.1 °C |
| 19 Aug 2024, 13:08 | 14 | 14 °C |
| 17 Jul 2024, 13:07 | 14.4 | 14.4 °C |
pH
code 0061
7.8
Sampled 4 Jun 2026, 4 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Jun 2026, 12:21 | 7.8 | 7.8 |
| 15 May 2026, 10:08 | 7.94 | 7.94 |
| 14 Apr 2026, 11:21 | 7.79 | 7.79 |
| 17 Mar 2026, 09:18 | 8.03 | 8.03 |
| 3 Feb 2026, 11:17 | 7.39 | 7.39 |
| 6 Jan 2026, 11:21 | 7.88 | 7.88 |
| 8 Dec 2025, 10:05 | 7.9 | 7.9 |
| 3 Nov 2025, 11:56 | 7.66 | 7.66 |
| 2 Oct 2025, 10:04 | 7.72 | 7.72 |
| 12 Sep 2025, 08:58 | 6.72 | 6.72 |
| 1 Aug 2025, 09:17 | 7.72 | 7.72 |
| 10 Jul 2025, 11:02 | 7.52 | 7.52 |
| 3 Jun 2025, 10:08 | 7.82 | 7.82 |
| 12 May 2025, 13:28 | 7.77 | 7.77 |
| 2 Apr 2025, 12:23 | 7.6 | 7.6 |
| 12 Mar 2025, 10:18 | 7.9 | 7.9 |
| 19 Feb 2025, 10:29 | 7.81 | 7.81 |
| 24 Jan 2025, 10:36 | 8.48 | 8.48 |
| 4 Dec 2024, 12:34 | 7.53 | 7.53 |
| 19 Nov 2024, 12:16 | 7.75 | 7.75 |
| 17 Oct 2024, 10:23 | 7.66 | 7.66 |
| 30 Sep 2024, 11:54 | 7.89 | 7.89 |
| 19 Aug 2024, 13:08 | 7.66 | 7.66 |
| 17 Jul 2024, 13:07 | 7.59 | 7.59 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.067 mg/l
Sampled 4 Jun 2026, 4 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Jun 2026, 12:21 | 0.067 | 0.067 mg/l |
| 15 May 2026, 10:08 | 0.075 | 0.075 mg/l |
| 14 Apr 2026, 11:21 | 0.053 | 0.053 mg/l |
| 17 Mar 2026, 09:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Feb 2026, 11:17 | 0.03 | 0.03 mg/l |
| 6 Jan 2026, 11:21 | 0.055 | 0.055 mg/l |
| 8 Dec 2025, 10:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Nov 2025, 11:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Oct 2025, 10:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Sep 2025, 08:58 | 0.075 | 0.075 mg/l |
| 1 Aug 2025, 09:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Jul 2025, 11:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jun 2025, 10:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 May 2025, 13:28 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Apr 2025, 12:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Mar 2025, 10:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Feb 2025, 10:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Jan 2025, 10:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Dec 2024, 12:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Nov 2024, 12:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Oct 2024, 10:23 | 0.039 | 0.039 mg/l |
| 30 Sep 2024, 11:54 | 0.14 | 0.14 mg/l |
| 19 Aug 2024, 13:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jul 2024, 13:07 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
1.07 mg/l
Sampled 4 Jun 2026, 4 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Jun 2026, 12:21 | 1.07 | 1.07 mg/l |
| 15 May 2026, 10:08 | 0.936 | 0.936 mg/l |
| 14 Apr 2026, 11:21 | 1.1 | 1.1 mg/l |
| 17 Mar 2026, 09:18 | 1.3 | 1.3 mg/l |
| 3 Feb 2026, 11:17 | 1.4 | 1.4 mg/l |
| 6 Jan 2026, 11:21 | 1.39 | 1.39 mg/l |
| 8 Dec 2025, 10:05 | 1.3 | 1.3 mg/l |
| 3 Nov 2025, 11:56 | 1.2 | 1.2 mg/l |
| 2 Oct 2025, 10:04 | 1.2 | 1.2 mg/l |
| 12 Sep 2025, 08:58 | 1.1 | 1.1 mg/l |
| 1 Aug 2025, 09:17 | 0.756 | 0.756 mg/l |
| 10 Jul 2025, 11:02 | 0.896 | 0.896 mg/l |
| 3 Jun 2025, 10:08 | 0.841 | 0.841 mg/l |
| 12 May 2025, 13:28 | 1.09 | 1.09 mg/l |
| 2 Apr 2025, 12:23 | 1.3 | 1.3 mg/l |
| 12 Mar 2025, 10:18 | 1.5 | 1.5 mg/l |
| 19 Feb 2025, 10:29 | 1.5 | 1.5 mg/l |
| 24 Jan 2025, 10:36 | 1.4 | 1.4 mg/l |
| 4 Dec 2024, 12:34 | 1.8 | 1.8 mg/l |
| 19 Nov 2024, 12:16 | 0.996 | 0.996 mg/l |
| 17 Oct 2024, 10:23 | 1.1 | 1.1 mg/l |
| 30 Sep 2024, 11:54 | 0.774 | 0.774 mg/l |
| 19 Aug 2024, 13:08 | 0.906 | 0.906 mg/l |
| 17 Jul 2024, 13:07 | 0.956 | 0.956 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.046 mg/l
Sampled 4 Jun 2026, 4 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Jun 2026, 12:21 | 0.046 | 0.046 mg/l |
| 15 May 2026, 10:08 | 0.02 | 0.02 mg/l |
| 14 Apr 2026, 11:21 | 0.026 | 0.026 mg/l |
| 17 Mar 2026, 09:18 | 0.013 | 0.013 mg/l |
| 3 Feb 2026, 11:17 | 0.018 | 0.018 mg/l |
| 6 Jan 2026, 11:21 | 0.027 | 0.027 mg/l |
| 8 Dec 2025, 10:05 | 0.015 | 0.015 mg/l |
| 3 Nov 2025, 11:56 | 0.026 | 0.026 mg/l |
| 2 Oct 2025, 10:04 | 0.018 | 0.018 mg/l |
| 12 Sep 2025, 08:58 | 0.022 | 0.022 mg/l |
| 1 Aug 2025, 09:17 | 0.024 | 0.024 mg/l |
| 10 Jul 2025, 11:02 | 0.047 | 0.047 mg/l |
| 3 Jun 2025, 10:08 | 0.032 | 0.032 mg/l |
| 12 May 2025, 13:28 | 0.039 | 0.039 mg/l |
| 2 Apr 2025, 12:23 | 0.015 | 0.015 mg/l |
| 12 Mar 2025, 10:18 | 0.017 | 0.017 mg/l |
| 19 Feb 2025, 10:29 | 0.019 | 0.019 mg/l |
| 24 Jan 2025, 10:36 | 0.021 | 0.021 mg/l |
| 4 Dec 2024, 12:34 | 0.012 | 0.012 mg/l |
| 19 Nov 2024, 12:16 | 0.017 | 0.017 mg/l |
| 17 Oct 2024, 10:23 | 0.03 | 0.03 mg/l |
| 30 Sep 2024, 11:54 | 0.03 | 0.03 mg/l |
| 19 Aug 2024, 13:08 | 0.03 | 0.03 mg/l |
| 17 Jul 2024, 13:07 | 0.014 | 0.014 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
156 µS/cm
Sampled 4 Jun 2026, 4 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Jun 2026, 12:21 | 156 | 156 µS/cm |
| 15 May 2026, 10:08 | 178 | 178 µS/cm |
| 14 Apr 2026, 11:21 | 159 | 159 µS/cm |
| 17 Mar 2026, 09:18 | 133 | 133 µS/cm |
| 3 Feb 2026, 11:17 | 145 | 145 µS/cm |
| 6 Jan 2026, 11:21 | 170 | 170 µS/cm |
| 8 Dec 2025, 10:05 | 135 | 135 µS/cm |
| 3 Nov 2025, 11:56 | 157 | 157 µS/cm |
| 2 Oct 2025, 10:04 | 193 | 193 µS/cm |
| 12 Sep 2025, 08:58 | 175 | 175 µS/cm |
| 1 Aug 2025, 09:17 | 185 | 185 µS/cm |
| 10 Jul 2025, 11:02 | 178 | 178 µS/cm |
| 3 Jun 2025, 10:08 | 167 | 167 µS/cm |
| 12 May 2025, 13:28 | 187 | 187 µS/cm |
| 2 Apr 2025, 12:23 | 177 | 177 µS/cm |
| 12 Mar 2025, 10:18 | 195 | 195 µS/cm |
| 19 Feb 2025, 10:29 | 180 | 180 µS/cm |
| 24 Jan 2025, 10:36 | 180 | 180 µS/cm |
| 4 Dec 2024, 12:34 | 160 | 160 µS/cm |
| 19 Nov 2024, 12:16 | 421 | 421 µS/cm |
| 17 Oct 2024, 10:23 | 148 | 148 µS/cm |
| 30 Sep 2024, 11:54 | 141 | 141 µS/cm |
| 19 Aug 2024, 13:08 | 176 | 176 µS/cm |
| 17 Jul 2024, 13:07 | 157 | 157 µS/cm |
Everything measured here
73 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 73 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 24 | Jul 2024 – Jun 2026 | 96.5% 4 Jun 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 24 | Jul 2024 – Jun 2026 | 10.1 mg/l 4 Jun 2026 |
| Temperature of Water 0076 | River water | 24 | Jul 2024 – Jun 2026 | 13 °C 4 Jun 2026 |
| pH 0061 | River water | 24 | Jul 2024 – Jun 2026 | 7.8 4 Jun 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 24 | Jul 2024 – Jun 2026 | 0.067 mg/l 4 Jun 2026 |
| Nitrate as N 0117 | River water | 24 | Jul 2024 – Jun 2026 | 1.07 mg/l 4 Jun 2026 |
| Orthophosphate, reactive as P 0180 | River water | 24 | Jul 2024 – Jun 2026 | 0.046 mg/l 4 Jun 2026 |
| Conductivity at 25 C 0077 | River water | 24 | Jul 2024 – Jun 2026 | 156 µS/cm 4 Jun 2026 |
| 10:2 Fluorotelomer sulfonic acid 2994 | River water | 1 | Jan 2026 – Jan 2026 | below 0.002 µg/l 6 Jan 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| 2H-Perfluoro-2-decenoic acid 2888 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 6 Jan 2026 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| 5:1:2 Fluorotelomer betaine 2887 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| 5:3 Fluorotelomer betaine 2886 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| 6:2 Fluorotelomer phosphate diester 2986 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 6 Jan 2026 |
| 6:2 Fluorotelomer sulfonamide amine oxide (6:2 FTNO) (Capstone A) 2841 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| 6:2 Fluorotelomer sulfonamide betaine 2985 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| 6:2/8:2 Fluorotelomer phosphate diester 2884 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 6 Jan 2026 |
| 6:6 Perfluorophosphinic acid 2883 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 6 Jan 2026 |
| 6:8 Perfluorophosphinic acid 2882 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 6 Jan 2026 |
| 8:2 Fluorotelomer phosphate diester 2880 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 6 Jan 2026 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| 8:8 Perfluorophosphinic acid 2879 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 6 Jan 2026 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 24 | Jul 2024 – Jun 2026 | 32 mg/l 4 Jun 2026 |
| Ammonia un-ionised as N 0119 | River water | 24 | Jul 2024 – Jun 2026 | 0.00097 mg/l 4 Jun 2026 |
| BOD : 5 Day ATU 0085 | River water | 23 | Jul 2024 – Jun 2026 | 3.8 mg/l 4 Jun 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| Hexafluoropropylene oxide trimer acid 2980 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 1 | Jan 2026 – Jan 2026 | below 0.002 µg/l 6 Jan 2026 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 1 | Jan 2026 – Jan 2026 | below 0.002 µg/l 6 Jan 2026 |
| Nitrite as N 0118 | River water | 24 | Jul 2024 – Jun 2026 | 0.026 mg/l 4 Jun 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 24 | Jul 2024 – Jun 2026 | 1.1 mg/l 4 Jun 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| Perfluorobutanesulfonic acid 2972 | River water | 1 | Jan 2026 – Jan 2026 | 0.0018 µg/l 6 Jan 2026 |
| Perfluorobutanoic acid 2995 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| Perfluorodecanesulfonic acid 2969 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| Perfluorodecanoic acid 8892 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| Perfluorododecane sulfonic acid 2968 | River water | 1 | Jan 2026 – Jan 2026 | below 0.005 µg/l 6 Jan 2026 |
| Perfluorododecanoic acid 8894 | River water | 1 | Jan 2026 – Jan 2026 | below 0.002 µg/l 6 Jan 2026 |
| Perfluoroheptanesulfonic acid 2967 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| Perfluoroheptanoic acid 8889 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| Perfluorohexanesulfonamide 2965 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| Perfluorohexanoic acid 8888 | River water | 1 | Jan 2026 – Jan 2026 | 0.0012 µg/l 6 Jan 2026 |
| Perfluorononanesulfonic acid 2963 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| Perfluorononanoic acid 8891 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| Perfluorooctadecanoic acid 2962 | River water | 1 | Jan 2026 – Jan 2026 | below 0.002 µg/l 6 Jan 2026 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 2026 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 1 | Jan 2026 – Jan 2026 | 0.00082 µg/l 6 Jan 2026 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 1 | Jan 2026 – Jan 2026 | 0.0015 µg/l 6 Jan 2026 |
| Perfluorooctanesulfonic acid (total) 2958 | River water | 1 | Jan 2026 – Jan 2026 | 0.0023 µg/l 6 Jan 2026 |
| Perfluorooctanoic acid 8890 | River water | 1 | Jan 2026 – Jan 2026 | 0.0023 µg/l 6 Jan 2026 |
| Perfluoropentanesulfonic acid 2957 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 6 Jan 2026 |
| Perfluorotetradecanoic acid 8895 | River water | 1 | Jan 2026 – Jan 2026 | below 0.006 µg/l 6 Jan 2026 |
| Perfluorotridecanoic acid 2955 | River water | 1 | Jan 2026 – Jan 2026 | below 0.002 µg/l 6 Jan 2026 |
| Perfluoroundecane sulfonic acid 2953 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 6 Jan 2026 |
| Perfluoroundecanoic acid 8893 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 6 Jan 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.