Holywell Brook at Sowood
EA name: HOLYWELL BROOK AT SOWOOD (also listed as “RSN2268 HOLYWELL BROOK AT SOWOOD”)
Environment Agency sampling point NE-RSN2268 · 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
- 9 Dec 2024, 10:4122 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
- 12 since 10 Jan 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 408478, 418741As published, to the nearest 1 m. Open in a map
- River, by its own name
- Holywell Brook
- River, by the map
- Holywell BrookPlaced on the river its name gives, 5 m from the line.
- Next gauge downstream
- Elland On the River Calder · 7.8 km along the river
- Why it was sampled
- Monitoring (national agency policy) (12 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
99.6%
Sampled 9 Dec 2024, 22 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Dec 2024, 10:41 | 99.6 | 99.6% |
| 8 Nov 2024, 09:56 | 100.2 | 100.2% |
| 22 Oct 2024, 13:47 | 103.3 | 103.3% |
| 24 Sep 2024, 11:54 | 100.2 | 100.2% |
| 2 Aug 2024, 07:40 | 102.7 | 102.7% |
| 1 Jul 2024, 09:20 | 104.1 | 104.1% |
| 11 Jun 2024, 09:20 | 100.4 | 100.4% |
| 10 May 2024, 13:42 | 103.4 | 103.4% |
| 23 Apr 2024, 11:15 | 94.7 | 94.7% |
| 1 Mar 2024, 10:51 | 104.4 | 104.4% |
| 13 Feb 2024, 13:39 | 100.2 | 100.2% |
| 10 Jan 2024, 11:48 | 101.6 | 101.6% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.8 mg/l
Sampled 9 Dec 2024, 22 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Dec 2024, 10:41 | 11.8 | 11.8 mg/l |
| 8 Nov 2024, 09:56 | 11.6 | 11.6 mg/l |
| 22 Oct 2024, 13:47 | 11.2 | 11.2 mg/l |
| 24 Sep 2024, 11:54 | 10.8 | 10.8 mg/l |
| 2 Aug 2024, 07:40 | 11.2 | 11.2 mg/l |
| 1 Jul 2024, 09:20 | 11.5 | 11.5 mg/l |
| 11 Jun 2024, 09:20 | 11.4 | 11.4 mg/l |
| 10 May 2024, 13:42 | 10.7 | 10.7 mg/l |
| 23 Apr 2024, 11:15 | 11.2 | 11.2 mg/l |
| 1 Mar 2024, 10:51 | 12.6 | 12.6 mg/l |
| 13 Feb 2024, 13:39 | 12.2 | 12.2 mg/l |
| 10 Jan 2024, 11:48 | 12.3 | 12.3 mg/l |
Water temperature
code 0076 · °C
7.8 °C
Sampled 9 Dec 2024, 22 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Dec 2024, 10:41 | 7.8 | 7.8 °C |
| 8 Nov 2024, 09:56 | 9 | 9 °C |
| 22 Oct 2024, 13:47 | 11.8 | 11.8 °C |
| 24 Sep 2024, 11:54 | 11.8 | 11.8 °C |
| 2 Aug 2024, 07:40 | 11.5 | 11.5 °C |
| 1 Jul 2024, 09:20 | 10.9 | 10.9 °C |
| 11 Jun 2024, 09:20 | 9.6 | 9.6 °C |
| 10 May 2024, 13:42 | 13.8 | 13.8 °C |
| 23 Apr 2024, 11:15 | 8 | 8 °C |
| 1 Mar 2024, 10:51 | 7.1 | 7.1 °C |
| 13 Feb 2024, 13:39 | 6.9 | 6.9 °C |
| 10 Jan 2024, 11:48 | 7.1 | 7.1 °C |
pH
code 0061
7.97
Sampled 9 Dec 2024, 22 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Dec 2024, 10:41 | 7.97 | 7.97 |
| 8 Nov 2024, 09:56 | 7.96 | 7.96 |
| 22 Oct 2024, 13:47 | 7.64 | 7.64 |
| 24 Sep 2024, 11:54 | 7.94 | 7.94 |
| 2 Aug 2024, 07:40 | 8.03 | 8.03 |
| 1 Jul 2024, 09:20 | 8.07 | 8.07 |
| 11 Jun 2024, 09:20 | 8 | 8 |
| 10 May 2024, 13:42 | 8.23 | 8.23 |
| 23 Apr 2024, 11:15 | 6.6 | 6.6 |
| 1 Mar 2024, 10:51 | 7.84 | 7.84 |
| 13 Feb 2024, 13:39 | 8.12 | 8.12 |
| 10 Jan 2024, 11:48 | 8.12 | 8.12 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.0035 mg/l
Sampled 9 Dec 2024, 22 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Dec 2024, 10:41 | 0.0035 | 0.0035 mg/l |
| 8 Nov 2024, 09:56 | 0.007 | 0.007 mg/l |
| 22 Oct 2024, 13:47 | 0.014 | 0.014 mg/l |
| 24 Sep 2024, 11:54 | 0.017 | 0.017 mg/l |
| 2 Aug 2024, 07:40 | 0.005 | 0.005 mg/l |
| 1 Jul 2024, 09:20 | 0.0079 | 0.0079 mg/l |
| 11 Jun 2024, 09:20 | <0.002 | below 0.002 mg/l (not detected above this) |
| 10 May 2024, 13:42 | 0.0072 | 0.0072 mg/l |
| 23 Apr 2024, 11:15 | 0.1 | 0.1 mg/l |
| 1 Mar 2024, 10:51 | 0.01 | 0.01 mg/l |
| 13 Feb 2024, 13:39 | 0.0064 | 0.0064 mg/l |
| 10 Jan 2024, 11:48 | 0.0067 | 0.0067 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
3.1 mg/l
Sampled 9 Dec 2024, 22 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Dec 2024, 10:41 | 3.1 | 3.1 mg/l |
| 8 Nov 2024, 09:56 | 2.3 | 2.3 mg/l |
| 22 Oct 2024, 13:47 | 2.89 | 2.89 mg/l |
| 24 Sep 2024, 11:54 | 2.39 | 2.39 mg/l |
| 2 Aug 2024, 07:40 | 2.1 | 2.1 mg/l |
| 1 Jul 2024, 09:20 | 2.3 | 2.3 mg/l |
| 11 Jun 2024, 09:20 | 1.3 | 1.3 mg/l |
| 10 May 2024, 13:42 | 2.2 | 2.2 mg/l |
| 23 Apr 2024, 11:15 | 0.149 | 0.149 mg/l |
| 1 Mar 2024, 10:51 | 2.8 | 2.8 mg/l |
| 13 Feb 2024, 13:39 | 1.89 | 1.89 mg/l |
| 10 Jan 2024, 11:48 | 2.7 | 2.7 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.026 mg/l
Sampled 9 Dec 2024, 22 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Dec 2024, 10:41 | 0.026 | 0.026 mg/l |
| 8 Nov 2024, 09:56 | 0.032 | 0.032 mg/l |
| 22 Oct 2024, 13:47 | 0.034 | 0.034 mg/l |
| 24 Sep 2024, 11:54 | 0.041 | 0.041 mg/l |
| 2 Aug 2024, 07:40 | 0.038 | 0.038 mg/l |
| 1 Jul 2024, 09:20 | 0.036 | 0.036 mg/l |
| 11 Jun 2024, 09:20 | 0.022 | 0.022 mg/l |
| 10 May 2024, 13:42 | 0.026 | 0.026 mg/l |
| 23 Apr 2024, 11:15 | <0.001 | below 0.001 mg/l (not detected above this) |
| 1 Mar 2024, 10:51 | 0.021 | 0.021 mg/l |
| 13 Feb 2024, 13:39 | 0.046 | 0.046 mg/l |
| 10 Jan 2024, 11:48 | 0.018 | 0.018 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
274 µS/cm
Sampled 9 Dec 2024, 22 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Dec 2024, 10:41 | 274 | 274 µS/cm |
| 8 Nov 2024, 09:56 | 317 | 317 µS/cm |
| 22 Oct 2024, 13:47 | 151 | 151 µS/cm |
| 24 Sep 2024, 11:54 | 353 | 353 µS/cm |
| 2 Aug 2024, 07:40 | 350 | 350 µS/cm |
| 1 Jul 2024, 09:20 | 355 | 355 µS/cm |
| 11 Jun 2024, 09:20 | 269 | 269 µS/cm |
| 10 May 2024, 13:42 | 357 | 357 µS/cm |
| 23 Apr 2024, 11:15 | 434 | 434 µS/cm |
| 1 Mar 2024, 10:51 | 303 | 303 µS/cm |
| 13 Feb 2024, 13:39 | 204 | 204 µS/cm |
| 10 Jan 2024, 11:48 | 353 | 353 µS/cm |
Everything measured here
17 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 17 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 12 | Jan 2024 – Dec 2024 | 99.6% 9 Dec 2024 |
| Oxygen, Dissolved as O2 9924 | River water | 12 | Jan 2024 – Dec 2024 | 11.8 mg/l 9 Dec 2024 |
| Temperature of Water 0076 | River water | 12 | Jan 2024 – Dec 2024 | 7.8 °C 9 Dec 2024 |
| pH 0061 | River water | 12 | Jan 2024 – Dec 2024 | 7.97 9 Dec 2024 |
| Ammoniacal Nitrogen as N 0111 | River water | 12 | Jan 2024 – Dec 2024 | 0.0035 mg/l 9 Dec 2024 |
| Nitrate as N 0117 | River water | 12 | Jan 2024 – Dec 2024 | 3.1 mg/l 9 Dec 2024 |
| Orthophosphate, reactive as P 0180 | River water | 12 | Jan 2024 – Dec 2024 | 0.026 mg/l 9 Dec 2024 |
| Conductivity at 25 C 0077 | River water | 12 | Jan 2024 – Dec 2024 | 274 µS/cm 9 Dec 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 12 | Jan 2024 – Dec 2024 | 34 mg/l 9 Dec 2024 |
| Ammonia un-ionised as N 0119 | River water | 12 | Jan 2024 – Dec 2024 | 0.00005 mg/l 9 Dec 2024 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 11 | Jan 2024 – Nov 2024 | 1.9 mg/l 8 Nov 2024 |
| Chloride 0172 | River water | 12 | Jan 2024 – Dec 2024 | 36 mg/l 9 Dec 2024 |
| Flow Type 2896 | River water | 3 | Aug 2024 – Dec 2024 | Moderate Flow 9 Dec 2024 |
| Nitrite as N 0118 | River water | 12 | Jan 2024 – Dec 2024 | 0.0033 mg/l 9 Dec 2024 |
| Nitrogen, Total Oxidised as N 0116 | River water | 12 | Jan 2024 – Dec 2024 | 3.1 mg/l 9 Dec 2024 |
| Phosphorus, Total as P 0348 | River water | 12 | Jan 2024 – Dec 2024 | 0.036 mg/l 9 Dec 2024 |
| Silica, reactive as SiO2 0182 | River water | 12 | Jan 2024 – Dec 2024 | 11 mg/l 9 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.