Great Hallingbury Brook above Stort
EA name: GT HALLINGBURY BROOK ABOVE STORT
Environment Agency sampling point TH-PLER0039 · 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
- 21 Sep 2026, 12:1310 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 28 since 12 Jun 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) · results completed 23 Sep 2026
- Where
- National Grid 549784, 219023As published, to the nearest 1 m. Open in a map
- River, by its own name
- Great Hallingbury Brook
- River, by the map
- Great Hallingbury BrookPlaced on the river its name gives, 1 m from the line.
- Next gauge downstream
- Sawbridgeworth On the River Stort · 5.7 km along the river (the path rests on a repair to the map)
- Why it was sampled
- Monitoring (national agency policy) (28 samples)
Results here were completed a median of 3 days after the sample was taken (2 to 44 days, 13 samples).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
94.9%
Sampled 21 Sep 2026, 10 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 12:13 | 94.9 | 94.9% |
| 6 Aug 2026, 13:18 | 76.9 | 76.9% |
| 14 Jul 2026, 08:55 | 94.1 | 94.1% |
| 22 Jun 2026, 12:39 | 94.6 | 94.6% |
| 15 May 2026, 13:37 | 91.9 | 91.9% |
| 27 Apr 2026, 10:02 | 86.4 | 86.4% |
| 2 Mar 2026, 13:20 | 99.9 | 99.9% |
| 2 Feb 2026, 09:19 | 97.3 | 97.3% |
| 19 Jan 2026, 11:42 | 98 | 98% |
| 4 Dec 2025, 12:16 | 94.5 | 94.5% |
| 6 Nov 2025, 12:17 | 93.7 | 93.7% |
| 20 Oct 2025, 11:35 | 94.2 | 94.2% |
| 4 Sep 2025, 13:26 | 90.1 | 90.1% |
| 6 Aug 2025, 11:25 | 90.7 | 90.7% |
| 3 Jul 2025, 13:37 | 87.9 | 87.9% |
| 9 Jun 2025, 10:06 | 84.3 | 84.3% |
| 22 May 2025, 10:58 | 95.6 | 95.6% |
| 30 Apr 2025, 14:00 | 102.9 | 102.9% |
| 4 Mar 2025, 13:08 | 102.2 | 102.2% |
| 13 Feb 2025, 10:26 | 96.8 | 96.8% |
| 23 Jan 2025, 12:05 | 90.4 | 90.4% |
| 11 Dec 2024, 11:17 | 98.3 | 98.3% |
| 1 Nov 2024, 12:44 | 94.7 | 94.7% |
| 4 Oct 2024, 11:49 | 96.3 | 96.3% |
| 6 Sep 2024, 11:08 | 97 | 97% |
| 2 Aug 2024, 11:19 | 95.3 | 95.3% |
| 11 Jul 2024, 11:52 | 96.2 | 96.2% |
| 12 Jun 2024, 12:16 | 95.6 | 95.6% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.78 mg/l
Sampled 21 Sep 2026, 10 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 12:13 | 8.78 | 8.78 mg/l |
| 6 Aug 2026, 13:18 | 7.07 | 7.07 mg/l |
| 14 Jul 2026, 08:55 | 8.47 | 8.47 mg/l |
| 22 Jun 2026, 12:39 | 8.43 | 8.43 mg/l |
| 15 May 2026, 13:37 | 9.24 | 9.24 mg/l |
| 27 Apr 2026, 10:02 | 8.62 | 8.62 mg/l |
| 2 Mar 2026, 13:20 | 10.6 | 10.6 mg/l |
| 2 Feb 2026, 09:19 | 11 | 11 mg/l |
| 19 Jan 2026, 11:42 | 11 | 11 mg/l |
| 4 Dec 2025, 12:16 | 9.93 | 9.93 mg/l |
| 6 Nov 2025, 12:17 | 9.15 | 9.15 mg/l |
| 20 Oct 2025, 11:35 | 9.31 | 9.31 mg/l |
| 4 Sep 2025, 13:26 | 8.44 | 8.44 mg/l |
| 6 Aug 2025, 11:25 | 8.43 | 8.43 mg/l |
| 3 Jul 2025, 13:37 | 7.62 | 7.62 mg/l |
| 9 Jun 2025, 10:06 | 8.32 | 8.32 mg/l |
| 22 May 2025, 10:58 | 9.35 | 9.35 mg/l |
| 30 Apr 2025, 14:00 | 9.78 | 9.78 mg/l |
| 4 Mar 2025, 13:08 | 11.7 | 11.7 mg/l |
| 13 Feb 2025, 10:26 | 11.2 | 11.2 mg/l |
| 23 Jan 2025, 12:05 | 10 | 10 mg/l |
| 11 Dec 2024, 11:17 | 10.7 | 10.7 mg/l |
| 1 Nov 2024, 12:44 | 9.38 | 9.38 mg/l |
| 4 Oct 2024, 11:49 | 9.54 | 9.54 mg/l |
| 6 Sep 2024, 11:08 | 8.9 | 8.9 mg/l |
| 2 Aug 2024, 11:19 | 8.63 | 8.63 mg/l |
| 11 Jul 2024, 11:52 | 9.18 | 9.18 mg/l |
| 12 Jun 2024, 12:16 | 9.41 | 9.41 mg/l |
Water temperature
code 0076 · °C
19 °C
Sampled 21 Sep 2026, 10 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 12:13 | 19 | 19 °C |
| 6 Aug 2026, 13:18 | 19.3 | 19.3 °C |
| 14 Jul 2026, 08:55 | 20.4 | 20.4 °C |
| 22 Jun 2026, 12:39 | 20.9 | 20.9 °C |
| 15 May 2026, 13:37 | 15 | 15 °C |
| 27 Apr 2026, 10:02 | 15.4 | 15.4 °C |
| 2 Mar 2026, 13:20 | 12.5 | 12.5 °C |
| 2 Feb 2026, 09:19 | 10 | 10 °C |
| 19 Jan 2026, 11:42 | 10.1 | 10.1 °C |
| 4 Dec 2025, 12:16 | 13 | 13 °C |
| 6 Nov 2025, 12:17 | 16.4 | 16.4 °C |
| 20 Oct 2025, 11:35 | 15.8 | 15.8 °C |
| 4 Sep 2025, 13:26 | 18.4 | 18.4 °C |
| 6 Aug 2025, 11:25 | 18.8 | 18.8 °C |
| 3 Jul 2025, 13:37 | 22.3 | 22.3 °C |
| 9 Jun 2025, 10:06 | 15.9 | 15.9 °C |
| 22 May 2025, 10:58 | 16.3 | 16.3 °C |
| 30 Apr 2025, 14:00 | 17.7 | 17.7 °C |
| 4 Mar 2025, 13:08 | 9.4 | 9.4 °C |
| 13 Feb 2025, 10:26 | 8.8 | 8.8 °C |
| 23 Jan 2025, 12:05 | 10.7 | 10.7 °C |
| 11 Dec 2024, 11:17 | 11.3 | 11.3 °C |
| 1 Nov 2024, 12:44 | 15.7 | 15.7 °C |
| 4 Oct 2024, 11:49 | 15.7 | 15.7 °C |
| 6 Sep 2024, 11:08 | 19.4 | 19.4 °C |
| 2 Aug 2024, 11:19 | 20.1 | 20.1 °C |
| 11 Jul 2024, 11:52 | 17.5 | 17.5 °C |
| 12 Jun 2024, 12:16 | 16 | 16 °C |
pH
code 0061
7.96
Sampled 21 Sep 2026, 10 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 12:13 | 7.96 | 7.96 |
| 6 Aug 2026, 13:18 | 7.97 | 7.97 |
| 14 Jul 2026, 08:55 | 7.92 | 7.92 |
| 22 Jun 2026, 12:39 | 7.96 | 7.96 |
| 15 May 2026, 13:37 | 8.12 | 8.12 |
| 27 Apr 2026, 10:02 | 7.62 | 7.62 |
| 2 Mar 2026, 13:20 | 8.3 | 8.3 |
| 2 Feb 2026, 09:19 | 7.92 | 7.92 |
| 19 Jan 2026, 11:42 | 7.79 | 7.79 |
| 4 Dec 2025, 12:16 | 7.79 | 7.79 |
| 6 Nov 2025, 12:17 | 7.8 | 7.8 |
| 20 Oct 2025, 11:35 | 7.81 | 7.81 |
| 4 Sep 2025, 13:26 | 7.78 | 7.78 |
| 6 Aug 2025, 11:25 | 7.76 | 7.76 |
| 3 Jul 2025, 13:37 | 8.17 | 8.17 |
| 9 Jun 2025, 10:06 | 8.11 | 8.11 |
| 22 May 2025, 10:58 | 7.86 | 7.86 |
| 30 Apr 2025, 14:00 | 7.86 | 7.86 |
| 4 Mar 2025, 13:08 | 7.96 | 7.96 |
| 13 Feb 2025, 10:26 | 7.84 | 7.84 |
| 23 Jan 2025, 12:05 | 7.82 | 7.82 |
| 11 Dec 2024, 11:17 | 7.7 | 7.7 |
| 1 Nov 2024, 12:44 | 7.68 | 7.68 |
| 4 Oct 2024, 11:49 | 7.77 | 7.77 |
| 6 Sep 2024, 11:08 | 7.78 | 7.78 |
| 2 Aug 2024, 11:19 | 7.82 | 7.82 |
| 11 Jul 2024, 11:52 | 7.84 | 7.84 |
| 12 Jun 2024, 12:16 | 7.83 | 7.83 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 21 Sep 2026, 10 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 12:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Aug 2026, 13:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Jul 2026, 08:55 | 0.051 | 0.051 mg/l |
| 22 Jun 2026, 12:39 | 0.031 | 0.031 mg/l |
| 15 May 2026, 13:37 | 0.039 | 0.039 mg/l |
| 27 Apr 2026, 10:02 | 0.43 | 0.43 mg/l |
| 2 Mar 2026, 13:20 | 0.19 | 0.19 mg/l |
| 2 Feb 2026, 09:19 | 0.059 | 0.059 mg/l |
| 19 Jan 2026, 11:42 | 0.11 | 0.11 mg/l |
| 4 Dec 2025, 12:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Nov 2025, 12:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Oct 2025, 11:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Sep 2025, 13:26 | 0.035 | 0.035 mg/l |
| 6 Aug 2025, 11:25 | 0.058 | 0.058 mg/l |
| 3 Jul 2025, 13:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jun 2025, 10:06 | 0.33 | 0.33 mg/l |
| 22 May 2025, 10:58 | 0.071 | 0.071 mg/l |
| 30 Apr 2025, 14:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Mar 2025, 13:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Feb 2025, 10:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Jan 2025, 12:05 | 0.031 | 0.031 mg/l |
| 11 Dec 2024, 11:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Nov 2024, 12:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Oct 2024, 11:49 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Sep 2024, 11:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Aug 2024, 11:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Jul 2024, 11:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Jun 2024, 12:16 | 0.11 | 0.11 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
29 mg/l
Sampled 21 Sep 2026, 10 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 12:13 | 29 | 29 mg/l |
| 6 Aug 2026, 13:18 | 18.9 | 18.9 mg/l |
| 14 Jul 2026, 08:55 | 28 | 28 mg/l |
| 22 Jun 2026, 12:39 | 22 | 22 mg/l |
| 15 May 2026, 13:37 | 19 | 19 mg/l |
| 27 Apr 2026, 10:02 | 23.7 | 23.7 mg/l |
| 2 Mar 2026, 13:20 | 11.9 | 11.9 mg/l |
| 2 Feb 2026, 09:19 | 15 | 15 mg/l |
| 19 Jan 2026, 11:42 | 12.9 | 12.9 mg/l |
| 4 Dec 2025, 12:16 | 16 | 16 mg/l |
| 6 Nov 2025, 12:17 | 29 | 29 mg/l |
| 20 Oct 2025, 11:35 | 18 | 18 mg/l |
| 4 Sep 2025, 13:26 | 17 | 17 mg/l |
| 6 Aug 2025, 11:25 | 28 | 28 mg/l |
| 3 Jul 2025, 13:37 | 11.9 | 11.9 mg/l |
| 9 Jun 2025, 10:06 | 23.8 | 23.8 mg/l |
| 22 May 2025, 10:58 | 25.9 | 25.9 mg/l |
| 30 Apr 2025, 14:00 | 18 | 18 mg/l |
| 4 Mar 2025, 13:08 | 16 | 16 mg/l |
| 13 Feb 2025, 10:26 | 18 | 18 mg/l |
| 23 Jan 2025, 12:05 | 26 | 26 mg/l |
| 11 Dec 2024, 11:17 | 18 | 18 mg/l |
| 1 Nov 2024, 12:44 | 28 | 28 mg/l |
| 4 Oct 2024, 11:49 | 20 | 20 mg/l |
| 6 Sep 2024, 11:08 | 32 | 32 mg/l |
| 2 Aug 2024, 11:19 | 32 | 32 mg/l |
| 11 Jul 2024, 11:52 | 19 | 19 mg/l |
| 12 Jun 2024, 12:16 | 24.9 | 24.9 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.72 mg/l
Sampled 21 Sep 2026, 10 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 12:13 | 0.72 | 0.72 mg/l |
| 6 Aug 2026, 13:18 | 0.75 | 0.75 mg/l |
| 14 Jul 2026, 08:55 | 1.8 | 1.8 mg/l |
| 22 Jun 2026, 12:39 | 1.8 | 1.8 mg/l |
| 15 May 2026, 13:37 | 1.8 | 1.8 mg/l |
| 27 Apr 2026, 10:02 | 1.5 | 1.5 mg/l |
| 2 Mar 2026, 13:20 | 0.38 | 0.38 mg/l |
| 2 Feb 2026, 09:19 | 0.17 | 0.17 mg/l |
| 19 Jan 2026, 11:42 | 0.15 | 0.15 mg/l |
| 4 Dec 2025, 12:16 | 0.53 | 0.53 mg/l |
| 6 Nov 2025, 12:17 | 0.56 | 0.56 mg/l |
| 20 Oct 2025, 11:35 | 0.5 | 0.5 mg/l |
| 4 Sep 2025, 13:26 | 0.63 | 0.63 mg/l |
| 6 Aug 2025, 11:25 | 0.7 | 0.7 mg/l |
| 3 Jul 2025, 13:37 | 0.42 | 0.42 mg/l |
| 9 Jun 2025, 10:06 | 1.6 | 1.6 mg/l |
| 22 May 2025, 10:58 | 2.1 | 2.1 mg/l |
| 30 Apr 2025, 14:00 | 0.52 | 0.52 mg/l |
| 4 Mar 2025, 13:08 | 0.089 | 0.089 mg/l |
| 13 Feb 2025, 10:26 | 0.16 | 0.16 mg/l |
| 23 Jan 2025, 12:05 | 0.32 | 0.32 mg/l |
| 11 Dec 2024, 11:17 | 0.26 | 0.26 mg/l |
| 1 Nov 2024, 12:44 | 0.78 | 0.78 mg/l |
| 4 Oct 2024, 11:49 | 0.64 | 0.64 mg/l |
| 6 Sep 2024, 11:08 | 1.2 | 1.2 mg/l |
| 2 Aug 2024, 11:19 | 1.2 | 1.2 mg/l |
| 11 Jul 2024, 11:52 | 0.67 | 0.67 mg/l |
| 12 Jun 2024, 12:16 | 0.92 | 0.92 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
1313 µS/cm
Sampled 21 Sep 2026, 10 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 12:13 | 1313 | 1313 µS/cm |
| 6 Aug 2026, 13:18 | 1141 | 1141 µS/cm |
| 14 Jul 2026, 08:55 | 1346 | 1346 µS/cm |
| 22 Jun 2026, 12:39 | 1286 | 1286 µS/cm |
| 15 May 2026, 13:37 | 1237 | 1237 µS/cm |
| 27 Apr 2026, 10:02 | 1268 | 1268 µS/cm |
| 2 Mar 2026, 13:20 | 994 | 994 µS/cm |
| 2 Feb 2026, 09:19 | 992 | 992 µS/cm |
| 19 Jan 2026, 11:42 | 1238 | 1238 µS/cm |
| 4 Dec 2025, 12:16 | 1160 | 1160 µS/cm |
| 6 Nov 2025, 12:17 | 1252 | 1252 µS/cm |
| 20 Oct 2025, 11:35 | 1148 | 1148 µS/cm |
| 4 Sep 2025, 13:26 | 1017 | 1017 µS/cm |
| 6 Aug 2025, 11:25 | 1312 | 1312 µS/cm |
| 3 Jul 2025, 13:37 | 961 | 961 µS/cm |
| 9 Jun 2025, 10:06 | 1027 | 1027 µS/cm |
| 22 May 2025, 10:58 | 1294 | 1294 µS/cm |
| 30 Apr 2025, 14:00 | 1245 | 1245 µS/cm |
| 4 Mar 2025, 13:08 | 1135 | 1135 µS/cm |
| 13 Feb 2025, 10:26 | 1065 | 1065 µS/cm |
| 23 Jan 2025, 12:05 | 1265 | 1265 µS/cm |
| 11 Dec 2024, 11:17 | 1165 | 1165 µS/cm |
| 1 Nov 2024, 12:44 | 1189 | 1189 µS/cm |
| 4 Oct 2024, 11:49 | 1041 | 1041 µS/cm |
| 6 Sep 2024, 11:08 | 1296 | 1296 µS/cm |
| 2 Aug 2024, 11:19 | 1258 | 1258 µS/cm |
| 11 Jul 2024, 11:52 | 947 | 947 µS/cm |
| 12 Jun 2024, 12:16 | 1175 | 1175 µS/cm |
Everything measured here
80 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 80 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 28 | Jun 2024 – Sep 2026 | 94.9% 21 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 28 | Jun 2024 – Sep 2026 | 8.78 mg/l 21 Sep 2026 |
| Temperature of Water 0076 | River water | 28 | Jun 2024 – Sep 2026 | 19 °C 21 Sep 2026 |
| pH 0061 | River water | 28 | Jun 2024 – Sep 2026 | 7.96 21 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 28 | Jun 2024 – Sep 2026 | below 0.03 mg/l 21 Sep 2026 |
| Nitrate as N 0117 | River water | 28 | Jun 2024 – Sep 2026 | 29 mg/l 21 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 28 | Jun 2024 – Sep 2026 | 0.72 mg/l 21 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 28 | Jun 2024 – Sep 2026 | 1313 µS/cm 21 Sep 2026 |
| (Perfluorohexanesulfonyl)[3-(trimethylazaniumyl)propyl]azanide 2890 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 19 Jan 2026 |
| 10:2 Fluorotelomer sulfonic acid 2994 | River water | 1 | Jan 2026 – Jan 2026 | below 0.002 µg/l 19 Jan 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 2 | Jun 2025 – Jan 2026 | below 0.001 µg/l 19 Jan 2026 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 2 | Jun 2025 – Jan 2026 | below 0.001 µg/l 19 Jan 2026 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 2 | Jun 2025 – Jan 2026 | below 0.001 µg/l 19 Jan 2026 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 2 | Jun 2025 – Jan 2026 | below 0.0005 µg/l 19 Jan 2026 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 2 | Jun 2025 – Jan 2026 | below 0.0005 µg/l 19 Jan 2026 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 2 | Jun 2025 – Jan 2026 | below 0.001 µg/l 19 Jan 2026 |
| 2H-Perfluoro-2-decenoic acid 2888 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 19 Jan 2026 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 2 | Jun 2025 – Jan 2026 | below 0.0005 µg/l 19 Jan 2026 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 2 | Jun 2025 – Jan 2026 | below 0.004 µg/l 19 Jan 2026 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 2 | Jun 2025 – Jan 2026 | below 0.001 µg/l 19 Jan 2026 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 2 | Jun 2025 – Jan 2026 | below 0.0005 µg/l 19 Jan 2026 |
| 5:1:2 Fluorotelomer betaine 2887 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 19 Jan 2026 |
| 5:3 Fluorotelomer betaine 2886 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 19 Jan 2026 |
| 6:2 Fluorotelomer phosphate diester 2986 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 19 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 19 Jan 2026 |
| 6:2 Fluorotelomer sulfonamide betaine 2985 | River water | 1 | Jan 2026 – Jan 2026 | 0.019 µg/l 19 Jan 2026 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 2 | Jun 2025 – Jan 2026 | 0.007 µg/l 19 Jan 2026 |
| 6:2/8:2 Fluorotelomer phosphate diester 2884 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 19 Jan 2026 |
| 6:6 Perfluorophosphinic acid 2883 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 19 Jan 2026 |
| 6:8 Perfluorophosphinic acid 2882 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 19 Jan 2026 |
| 8:2 Fluorotelomer phosphate diester 2880 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 19 Jan 2026 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 2 | Jun 2025 – Jan 2026 | below 0.001 µg/l 19 Jan 2026 |
| 8:8 Perfluorophosphinic acid 2879 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 19 Jan 2026 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 2 | Jun 2025 – Jan 2026 | below 0.0005 µg/l 19 Jan 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 28 | Jun 2024 – Sep 2026 | 200 mg/l 21 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 28 | Jun 2024 – Sep 2026 | below 0.00096 mg/l 21 Sep 2026 |
| Calcium, Dissolved 0239 | River water | 6 | Apr 2025 – Jul 2026 | 130 mg/l 14 Jul 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 5 | Apr 2025 – Jul 2026 | 6.5 mg/l 14 Jul 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 2 | Jun 2025 – Jan 2026 | below 0.001 µg/l 19 Jan 2026 |
| Hexafluoropropylene oxide trimer acid 2980 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 19 Jan 2026 |
| Iron 6051 | River water | 6 | Apr 2025 – Jul 2026 | 650 µg/l 14 Jul 2026 |
| Iron, Dissolved 6460 | River water | 6 | Apr 2025 – Jul 2026 | 49 µg/l 14 Jul 2026 |
| Magnesium, Dissolved 0235 | River water | 6 | Apr 2025 – Jul 2026 | 7.8 mg/l 14 Jul 2026 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 2 | Jun 2025 – Jan 2026 | below 0.002 µg/l 19 Jan 2026 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 2 | Jun 2025 – Jan 2026 | below 0.002 µg/l 19 Jan 2026 |
| Nitrite as N 0118 | River water | 28 | Jun 2024 – Sep 2026 | 0.013 mg/l 21 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 28 | Jun 2024 – Sep 2026 | 29 mg/l 21 Sep 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 2 | Jun 2025 – Jan 2026 | below 0.0005 µg/l 19 Jan 2026 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 2 | Jun 2025 – Jan 2026 | below 0.0005 µg/l 19 Jan 2026 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 2 | Jun 2025 – Jan 2026 | below 0.0005 µg/l 19 Jan 2026 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 2 | Jun 2025 – Jan 2026 | below 0.0005 µg/l 19 Jan 2026 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 2 | Jun 2025 – Jan 2026 | 0.00094 µg/l 19 Jan 2026 |
| Perfluorobutanesulfonic acid 2972 | River water | 2 | Jun 2025 – Jan 2026 | 0.0062 µg/l 19 Jan 2026 |
| Perfluorobutanoic acid 2995 | River water | 2 | Jun 2025 – Jan 2026 | 0.0067 µg/l 19 Jan 2026 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 2 | Jun 2025 – Jan 2026 | 0.0013 µg/l 19 Jan 2026 |
| Perfluorodecanesulfonic acid 2969 | River water | 2 | Jun 2025 – Jan 2026 | below 0.001 µg/l 19 Jan 2026 |
| Perfluorodecanoic acid 8892 | River water | 2 | Jun 2025 – Jan 2026 | below 0.001 µg/l 19 Jan 2026 |
| Perfluorododecane sulfonic acid 2968 | River water | 2 | Jun 2025 – Jan 2026 | below 0.005 µg/l 19 Jan 2026 |
| Perfluorododecanoic acid 8894 | River water | 2 | Jun 2025 – Jan 2026 | below 0.002 µg/l 19 Jan 2026 |
| Perfluoroheptanesulfonic acid 2967 | River water | 2 | Jun 2025 – Jan 2026 | below 0.0005 µg/l 19 Jan 2026 |
| Perfluoroheptanoic acid 8889 | River water | 2 | Jun 2025 – Jan 2026 | 0.0056 µg/l 19 Jan 2026 |
| Perfluorohexane sulfonamido amine 2874 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 19 Jan 2026 |
| Perfluorohexanesulfonamide 2965 | River water | 2 | Jun 2025 – Jan 2026 | 0.0011 µg/l 19 Jan 2026 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 2 | Jun 2025 – Jan 2026 | 0.0016 µg/l 19 Jan 2026 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 2 | Jun 2025 – Jan 2026 | 0.0074 µg/l 19 Jan 2026 |
| Perfluorohexanoic acid 8888 | River water | 2 | Jun 2025 – Jan 2026 | 0.017 µg/l 19 Jan 2026 |
| Perfluorononanesulfonic acid 2963 | River water | 2 | Jun 2025 – Jan 2026 | below 0.0005 µg/l 19 Jan 2026 |
| Perfluorononanoic acid 8891 | River water | 2 | Jun 2025 – Jan 2026 | below 0.001 µg/l 19 Jan 2026 |
| Perfluorooctadecanoic acid 2962 | River water | 2 | Jun 2025 – Jan 2026 | below 0.002 µg/l 19 Jan 2026 |
| Perfluorooctanesulfonamide 2961 | River water | 2 | Jun 2025 – Jan 2026 | below 0.001 µg/l 19 Jan 2026 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 2 | Jun 2025 – Jan 2026 | 0.0068 µg/l 19 Jan 2026 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 2 | Jun 2025 – Jan 2026 | 0.008 µg/l 19 Jan 2026 |
| Perfluorooctanesulfonic acid (total) 2958 | River water | 1 | Jan 2026 – Jan 2026 | 0.015 µg/l 19 Jan 2026 |
| Perfluorooctanoic acid 8890 | River water | 2 | Jun 2025 – Jan 2026 | 0.0053 µg/l 19 Jan 2026 |
| Perfluoropentanesulfonic acid 2957 | River water | 2 | Jun 2025 – Jan 2026 | 0.0007 µg/l 19 Jan 2026 |
| Perfluoropentanoic acid 8887 | River water | 2 | Jun 2025 – Jan 2026 | 0.024 µg/l 19 Jan 2026 |
| Perfluorotetradecanoic acid 8895 | River water | 2 | Jun 2025 – Jan 2026 | below 0.006 µg/l 19 Jan 2026 |
| Perfluorotridecanoic acid 2955 | River water | 2 | Jun 2025 – Jan 2026 | below 0.002 µg/l 19 Jan 2026 |
| Perfluoroundecane sulfonic acid 2953 | River water | 2 | Jun 2025 – Jan 2026 | below 0.004 µg/l 19 Jan 2026 |
| Perfluoroundecanoic acid 8893 | River water | 2 | Jun 2025 – Jan 2026 | below 0.001 µg/l 19 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.