North River Holden Wood
EA name: NORTH RIVER HOLDEN WOOD (also listed as “RSN0589 NORTH RIVER HOLDEN WOOD”)
Environment Agency sampling point SO-RSN0589 · 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
- 27 Aug 2026, 11:4535 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 26 since 25 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)
- Where
- National Grid 512661, 139447As published, to the nearest 1 m. Open in a map
- River, by its own name
- Holden
- River, by the map
- Holden BrookPlaced on a river whose name partly matches its own, 2 m from the line.
- Next gauge downstream
- Alfoldean On the River Arun · 18 km along the river
- Why it was sampled
- Monitoring (national agency policy) (26 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
64.6%
Sampled 27 Aug 2026, 35 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 11:45 | 64.6 | 64.6% |
| 22 Jul 2026, 11:55 | 78.8 | 78.8% |
| 9 Jun 2026, 16:06 | 91.7 | 91.7% |
| 22 May 2026, 13:20 | 85.2 | 85.2% |
| 24 Apr 2026, 08:56 | 84.8 | 84.8% |
| 13 Feb 2026, 11:08 | 98.8 | 98.8% |
| 14 Jan 2026, 12:16 | 97.9 | 97.9% |
| 18 Dec 2025, 15:13 | 94.9 | 94.9% |
| 28 Nov 2025, 13:00 | 94.2 | 94.2% |
| 29 Oct 2025, 14:26 | 86.7 | 86.7% |
| 2 Sep 2025, 11:11 | 79 | 79% |
| 4 Aug 2025, 13:59 | 79.3 | 79.3% |
| 2 Jul 2025, 13:33 | 72.3 | 72.3% |
| 10 Jun 2025, 13:30 | 81.5 | 81.5% |
| 1 May 2025, 11:37 | 86.7 | 86.7% |
| 9 Apr 2025, 13:18 | 101.8 | 101.8% |
| 21 Mar 2025, 11:12 | 103.7 | 103.7% |
| 21 Feb 2025, 11:38 | 99.6 | 99.6% |
| 20 Jan 2025, 16:28 | 97.6 | 97.6% |
| 13 Dec 2024, 13:38 | 95.1 | 95.1% |
| 26 Nov 2024, 15:48 | 95.2 | 95.2% |
| 28 Oct 2024, 13:35 | 91.8 | 91.8% |
| 16 Sep 2024, 11:44 | 91.6 | 91.6% |
| 30 Aug 2024, 10:34 | 82.5 | 82.5% |
| 30 Jul 2024, 11:38 | 78.6 | 78.6% |
| 25 Jun 2024, 12:02 | 85.7 | 85.7% |
Dissolved oxygen
as O2 · code 9924 · mg/l
6.1 mg/l
Sampled 27 Aug 2026, 35 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 11:45 | 6.1 | 6.1 mg/l |
| 22 Jul 2026, 11:55 | 7.89 | 7.89 mg/l |
| 9 Jun 2026, 16:06 | 9.59 | 9.59 mg/l |
| 22 May 2026, 13:20 | 8.68 | 8.68 mg/l |
| 24 Apr 2026, 08:56 | 9.83 | 9.83 mg/l |
| 13 Feb 2026, 11:08 | 11.9 | 11.9 mg/l |
| 14 Jan 2026, 12:16 | 12.3 | 12.3 mg/l |
| 18 Dec 2025, 15:13 | 10.8 | 10.8 mg/l |
| 28 Nov 2025, 13:00 | 11 | 11 mg/l |
| 29 Oct 2025, 14:26 | 9.61 | 9.61 mg/l |
| 2 Sep 2025, 11:11 | 8.18 | 8.18 mg/l |
| 4 Aug 2025, 13:59 | 7.84 | 7.84 mg/l |
| 2 Jul 2025, 13:33 | 6.8 | 6.8 mg/l |
| 10 Jun 2025, 13:30 | 8.4 | 8.4 mg/l |
| 1 May 2025, 11:37 | 9.03 | 9.03 mg/l |
| 9 Apr 2025, 13:18 | 11.7 | 11.7 mg/l |
| 21 Mar 2025, 11:12 | 12 | 12 mg/l |
| 21 Feb 2025, 11:38 | 11.7 | 11.7 mg/l |
| 20 Jan 2025, 16:28 | 12.6 | 12.6 mg/l |
| 13 Dec 2024, 13:38 | 11.6 | 11.6 mg/l |
| 26 Nov 2024, 15:48 | 11.2 | 11.2 mg/l |
| 28 Oct 2024, 13:35 | 10.1 | 10.1 mg/l |
| 16 Sep 2024, 11:44 | 9.85 | 9.85 mg/l |
| 30 Aug 2024, 10:34 | 8.5 | 8.5 mg/l |
| 30 Jul 2024, 11:38 | 7.72 | 7.72 mg/l |
| 25 Jun 2024, 12:02 | 8.56 | 8.56 mg/l |
Water temperature
code 0076 · °C
18 °C
Sampled 27 Aug 2026, 35 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 11:45 | 18 | 18 °C |
| 22 Jul 2026, 11:55 | 15.2 | 15.2 °C |
| 9 Jun 2026, 16:06 | 13.2 | 13.2 °C |
| 22 May 2026, 13:20 | 14.4 | 14.4 °C |
| 24 Apr 2026, 08:56 | 8.8 | 8.8 °C |
| 13 Feb 2026, 11:08 | 7.4 | 7.4 °C |
| 14 Jan 2026, 12:16 | 5.5 | 5.5 °C |
| 18 Dec 2025, 15:13 | 9.4 | 9.4 °C |
| 28 Nov 2025, 13:00 | 8.6 | 8.6 °C |
| 29 Oct 2025, 14:26 | 10.7 | 10.7 °C |
| 2 Sep 2025, 11:11 | 13.7 | 13.7 °C |
| 4 Aug 2025, 13:59 | 15.8 | 15.8 °C |
| 2 Jul 2025, 13:33 | 18.2 | 18.2 °C |
| 10 Jun 2025, 13:30 | 13.9 | 13.9 °C |
| 1 May 2025, 11:37 | 13.4 | 13.4 °C |
| 9 Apr 2025, 13:18 | 9 | 9 °C |
| 21 Mar 2025, 11:12 | 9 | 9 °C |
| 21 Feb 2025, 11:38 | 8.3 | 8.3 °C |
| 20 Jan 2025, 16:28 | 4.4 | 4.4 °C |
| 13 Dec 2024, 13:38 | 6.7 | 6.7 °C |
| 26 Nov 2024, 15:48 | 8.1 | 8.1 °C |
| 28 Oct 2024, 13:35 | 11.1 | 11.1 °C |
| 16 Sep 2024, 11:44 | 12 | 12 °C |
| 30 Aug 2024, 10:34 | 13.9 | 13.9 °C |
| 30 Jul 2024, 11:38 | 16.1 | 16.1 °C |
| 25 Jun 2024, 12:02 | 15.3 | 15.3 °C |
pH
code 0061
7.54
Sampled 27 Aug 2026, 35 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 11:45 | 7.54 | 7.54 |
| 22 Jul 2026, 11:55 | 7.76 | 7.76 |
| 9 Jun 2026, 16:06 | 7.96 | 7.96 |
| 22 May 2026, 13:20 | 7.66 | 7.66 |
| 24 Apr 2026, 08:56 | 7.78 | 7.78 |
| 13 Feb 2026, 11:08 | 7.59 | 7.59 |
| 14 Jan 2026, 12:16 | 7.59 | 7.59 |
| 18 Dec 2025, 15:13 | 7.33 | 7.33 |
| 28 Nov 2025, 13:00 | 7.36 | 7.36 |
| 29 Oct 2025, 14:26 | 7.41 | 7.41 |
| 2 Sep 2025, 11:11 | 7.43 | 7.43 |
| 4 Aug 2025, 13:59 | 7.53 | 7.53 |
| 2 Jul 2025, 13:33 | 7.76 | 7.76 |
| 10 Jun 2025, 13:30 | 7.85 | 7.85 |
| 1 May 2025, 11:37 | 7.64 | 7.64 |
| 9 Apr 2025, 13:18 | 7.96 | 7.96 |
| 21 Mar 2025, 11:12 | 7.85 | 7.85 |
| 21 Feb 2025, 11:38 | 7.6 | 7.6 |
| 20 Jan 2025, 16:28 | 7.79 | 7.79 |
| 13 Dec 2024, 13:38 | 7.77 | 7.77 |
| 26 Nov 2024, 15:48 | 7.81 | 7.81 |
| 28 Oct 2024, 13:35 | 7.64 | 7.64 |
| 16 Sep 2024, 11:44 | 7.68 | 7.68 |
| 30 Aug 2024, 10:34 | 7.51 | 7.51 |
| 30 Jul 2024, 11:38 | 7.73 | 7.73 |
| 25 Jun 2024, 12:02 | 8.72 | 8.72 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.0062 mg/l
Sampled 27 Aug 2026, 35 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 11:45 | 0.0062 | 0.0062 mg/l |
| 22 Jul 2026, 11:55 | <0.002 | below 0.002 mg/l (not detected above this) |
| 9 Jun 2026, 16:06 | 0.028 | 0.028 mg/l |
| 22 May 2026, 13:20 | 0.05 | 0.05 mg/l |
| 24 Apr 2026, 08:56 | 0.019 | 0.019 mg/l |
| 13 Feb 2026, 11:08 | 0.024 | 0.024 mg/l |
| 14 Jan 2026, 12:16 | 0.028 | 0.028 mg/l |
| 18 Dec 2025, 15:13 | 0.066 | 0.066 mg/l |
| 28 Nov 2025, 13:00 | 0.035 | 0.035 mg/l |
| 29 Oct 2025, 14:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Sep 2025, 11:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Aug 2025, 13:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jul 2025, 13:33 | 0.047 | 0.047 mg/l |
| 10 Jun 2025, 13:30 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 May 2025, 11:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Apr 2025, 13:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Mar 2025, 11:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Feb 2025, 11:38 | 0.066 | 0.066 mg/l |
| 20 Jan 2025, 16:28 | 0.14 | 0.14 mg/l |
| 13 Dec 2024, 13:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Nov 2024, 15:48 | 0.051 | 0.051 mg/l |
| 28 Oct 2024, 13:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Sep 2024, 11:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Aug 2024, 10:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Jul 2024, 11:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Jun 2024, 12:02 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.614 mg/l
Sampled 27 Aug 2026, 35 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 11:45 | 0.614 | 0.614 mg/l |
| 22 Jul 2026, 11:55 | 0.606 | 0.606 mg/l |
| 9 Jun 2026, 16:06 | 1.38 | 1.38 mg/l |
| 22 May 2026, 13:20 | 1.77 | 1.77 mg/l |
| 24 Apr 2026, 08:56 | 2.09 | 2.09 mg/l |
| 13 Feb 2026, 11:08 | 0.583 | 0.583 mg/l |
| 14 Jan 2026, 12:16 | 1.09 | 1.09 mg/l |
| 18 Dec 2025, 15:13 | 0.866 | 0.866 mg/l |
| 28 Nov 2025, 13:00 | 1.19 | 1.19 mg/l |
| 29 Oct 2025, 14:26 | 0.996 | 0.996 mg/l |
| 2 Sep 2025, 11:11 | 1.6 | 1.6 mg/l |
| 4 Aug 2025, 13:59 | 1.4 | 1.4 mg/l |
| 2 Jul 2025, 13:33 | 1.98 | 1.98 mg/l |
| 10 Jun 2025, 13:30 | 1.59 | 1.59 mg/l |
| 1 May 2025, 11:37 | 2.28 | 2.28 mg/l |
| 9 Apr 2025, 13:18 | 2.09 | 2.09 mg/l |
| 21 Mar 2025, 11:12 | 1.39 | 1.39 mg/l |
| 21 Feb 2025, 11:38 | 0.989 | 0.989 mg/l |
| 20 Jan 2025, 16:28 | 1.28 | 1.28 mg/l |
| 13 Dec 2024, 13:38 | 1.09 | 1.09 mg/l |
| 26 Nov 2024, 15:48 | 1.49 | 1.49 mg/l |
| 28 Oct 2024, 13:35 | 1.19 | 1.19 mg/l |
| 16 Sep 2024, 11:44 | 2.69 | 2.69 mg/l |
| 30 Aug 2024, 10:34 | 1.8 | 1.8 mg/l |
| 30 Jul 2024, 11:38 | 2.09 | 2.09 mg/l |
| 25 Jun 2024, 12:02 | 2.69 | 2.69 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.12 mg/l
Sampled 27 Aug 2026, 35 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 11:45 | 0.12 | 0.12 mg/l |
| 22 Jul 2026, 11:55 | 0.14 | 0.14 mg/l |
| 9 Jun 2026, 16:06 | 0.11 | 0.11 mg/l |
| 22 May 2026, 13:20 | 0.12 | 0.12 mg/l |
| 24 Apr 2026, 08:56 | 0.097 | 0.097 mg/l |
| 13 Feb 2026, 11:08 | 0.05 | 0.05 mg/l |
| 14 Jan 2026, 12:16 | 0.055 | 0.055 mg/l |
| 18 Dec 2025, 15:13 | 0.081 | 0.081 mg/l |
| 28 Nov 2025, 13:00 | 0.039 | 0.039 mg/l |
| 29 Oct 2025, 14:26 | 0.073 | 0.073 mg/l |
| 2 Sep 2025, 11:11 | 0.07 | 0.07 mg/l |
| 4 Aug 2025, 13:59 | 0.084 | 0.084 mg/l |
| 2 Jul 2025, 13:33 | 0.1 | 0.1 mg/l |
| 10 Jun 2025, 13:30 | 0.099 | 0.099 mg/l |
| 1 May 2025, 11:37 | 0.16 | 0.16 mg/l |
| 9 Apr 2025, 13:18 | 0.11 | 0.11 mg/l |
| 21 Mar 2025, 11:12 | 0.039 | 0.039 mg/l |
| 21 Feb 2025, 11:38 | 0.035 | 0.035 mg/l |
| 20 Jan 2025, 16:28 | 0.071 | 0.071 mg/l |
| 13 Dec 2024, 13:38 | 0.049 | 0.049 mg/l |
| 26 Nov 2024, 15:48 | 0.11 | 0.11 mg/l |
| 28 Oct 2024, 13:35 | 0.086 | 0.086 mg/l |
| 16 Sep 2024, 11:44 | 0.17 | 0.17 mg/l |
| 30 Aug 2024, 10:34 | 0.26 | 0.26 mg/l |
| 30 Jul 2024, 11:38 | 0.27 | 0.27 mg/l |
| 25 Jun 2024, 12:02 | 0.27 | 0.27 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
441 µS/cm
Sampled 27 Aug 2026, 35 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 11:45 | 441 | 441 µS/cm |
| 22 Jul 2026, 11:55 | 417 | 417 µS/cm |
| 9 Jun 2026, 16:06 | 265 | 265 µS/cm |
| 22 May 2026, 13:20 | 283 | 283 µS/cm |
| 24 Apr 2026, 08:56 | 298 | 298 µS/cm |
| 13 Feb 2026, 11:08 | 179 | 179 µS/cm |
| 14 Jan 2026, 12:16 | 203 | 203 µS/cm |
| 18 Dec 2025, 15:13 | 162 | 162 µS/cm |
| 28 Nov 2025, 13:00 | 256 | 256 µS/cm |
| 29 Oct 2025, 14:26 | 286 | 286 µS/cm |
| 2 Sep 2025, 11:11 | 289 | 289 µS/cm |
| 4 Aug 2025, 13:59 | 271 | 271 µS/cm |
| 2 Jul 2025, 13:33 | 383 | 383 µS/cm |
| 10 Jun 2025, 13:30 | 282 | 282 µS/cm |
| 1 May 2025, 11:37 | 311 | 311 µS/cm |
| 9 Apr 2025, 13:18 | 292 | 292 µS/cm |
| 21 Mar 2025, 11:12 | 271 | 271 µS/cm |
| 21 Feb 2025, 11:38 | 231 | 231 µS/cm |
| 20 Jan 2025, 16:28 | 254 | 254 µS/cm |
| 13 Dec 2024, 13:38 | 218 | 218 µS/cm |
| 26 Nov 2024, 15:48 | 226 | 226 µS/cm |
| 28 Oct 2024, 13:35 | 244 | 244 µS/cm |
| 16 Sep 2024, 11:44 | 299 | 299 µS/cm |
| 30 Aug 2024, 10:34 | 300 | 300 µS/cm |
| 30 Jul 2024, 11:38 | 319 | 319 µS/cm |
| 25 Jun 2024, 12:02 | 315 | 315 µS/cm |
Everything measured here
20 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 20 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 26 | Jun 2024 – Aug 2026 | 64.6% 27 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 26 | Jun 2024 – Aug 2026 | 6.1 mg/l 27 Aug 2026 |
| Temperature of Water 0076 | River water | 26 | Jun 2024 – Aug 2026 | 18 °C 27 Aug 2026 |
| pH 0061 | River water | 26 | Jun 2024 – Aug 2026 | 7.54 27 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 26 | Jun 2024 – Aug 2026 | 0.0062 mg/l 27 Aug 2026 |
| Nitrate as N 0117 | River water | 26 | Jun 2024 – Aug 2026 | 0.614 mg/l 27 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 26 | Jun 2024 – Aug 2026 | 0.12 mg/l 27 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 26 | Jun 2024 – Aug 2026 | 441 µS/cm 27 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 26 | Jun 2024 – Aug 2026 | 120 mg/l 27 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 26 | Jun 2024 – Aug 2026 | 0.00007 mg/l 27 Aug 2026 |
| BOD : 5 Day ATU 0085 | River water | 22 | Jun 2024 – May 2026 | below 3 mg/l 22 May 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 7 | Jan 2026 – Aug 2026 | 7.1 mg/l 27 Aug 2026 |
| Chloride 0172 | River water | 7 | Jan 2026 – Aug 2026 | 54 mg/l 27 Aug 2026 |
| Flow Type 2896 | River water | 7 | Jan 2026 – Aug 2026 | Moderate Flow 27 Aug 2026 |
| GCMS Screen : Target Based multi-residue screening : Semi Quantitative 4994 | River water | 1 | Jun 2026 – Jun 2026 | 1 text result 9 Jun 2026 |
| Nitrite as N 0118 | River water | 26 | Jun 2024 – Aug 2026 | 0.0058 mg/l 27 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 26 | Jun 2024 – Aug 2026 | 0.62 mg/l 27 Aug 2026 |
| Phosphorus, Total as P 0348 | River water | 7 | Jan 2026 – Aug 2026 | 0.18 mg/l 27 Aug 2026 |
| Silica, reactive as SiO2 0182 | River water | 7 | Jan 2026 – Aug 2026 | 10 mg/l 27 Aug 2026 |
| Solids, Suspended at 105 C 0135 | River water | 7 | Jan 2026 – Aug 2026 | 19 mg/l 27 Aug 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.