Pearl Brook upstream of Horwich Final
EA name: PEARL BROOK U/S HORWICH FINAL
Environment Agency sampling point NW-88003106 · 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 Mar 2025, 11:3319 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 8 Oct 2026 and had nothing newer.
- Samples banked
- 12 since 8 Apr 2024 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Environmental monitoring statutory (EU directives)
- Where
- National Grid 362280, 410950As published, to the nearest 10 m. Open in a map
- River, by its own name
- Pearl Brook
- River, by the map
- Pearl BrookPlaced on the river its name gives, 14 m from the line.
- Next gauge downstream
- None tracedThe map stops before any gauge.
- Nearest gauge upstream
- Horwich Pearl Brook On the Pearl Brook · 1.8 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (12 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
97.9%
Sampled 4 Mar 2025, 19 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Mar 2025, 11:33 | 97.9 | 97.9% |
| 17 Feb 2025, 13:08 | 97.7 | 97.7% |
| 8 Jan 2025, 12:42 | 99 | 99% |
| 3 Dec 2024, 11:42 | 97 | 97% |
| 5 Nov 2024, 11:39 | 92.4 | 92.4% |
| 11 Oct 2024, 12:42 | 93.7 | 93.7% |
| 24 Sep 2024, 11:22 | 95.3 | 95.3% |
| 6 Aug 2024, 11:00 | 87.7 | 87.7% |
| 5 Jul 2024, 09:48 | 84.5 | 84.5% |
| 12 Jun 2024, 09:26 | 89.4 | 89.4% |
| 8 May 2024, 11:48 | 97.5 | 97.5% |
| 8 Apr 2024, 08:42 | 94.5 | 94.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.8 mg/l
Sampled 4 Mar 2025, 19 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Mar 2025, 11:33 | 11.8 | 11.8 mg/l |
| 17 Feb 2025, 13:08 | 11.9 | 11.9 mg/l |
| 8 Jan 2025, 12:42 | 12 | 12 mg/l |
| 3 Dec 2024, 11:42 | 11.8 | 11.8 mg/l |
| 5 Nov 2024, 11:39 | 10.3 | 10.3 mg/l |
| 11 Oct 2024, 12:42 | 10.6 | 10.6 mg/l |
| 24 Sep 2024, 11:22 | 9.63 | 9.63 mg/l |
| 6 Aug 2024, 11:00 | 8.88 | 8.88 mg/l |
| 5 Jul 2024, 09:48 | 9.15 | 9.15 mg/l |
| 12 Jun 2024, 09:26 | 9.86 | 9.86 mg/l |
| 8 May 2024, 11:48 | 10.5 | 10.5 mg/l |
| 8 Apr 2024, 08:42 | 10.9 | 10.9 mg/l |
Water temperature
code 0076 · °C
7.1 °C
Sampled 4 Mar 2025, 19 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Mar 2025, 11:33 | 7.1 | 7.1 °C |
| 17 Feb 2025, 13:08 | 6.8 | 6.8 °C |
| 8 Jan 2025, 12:42 | 7 | 7 °C |
| 3 Dec 2024, 11:42 | 7 | 7 °C |
| 5 Nov 2024, 11:39 | 10.4 | 10.4 °C |
| 11 Oct 2024, 12:42 | 9.9 | 9.9 °C |
| 24 Sep 2024, 11:22 | 14.8 | 14.8 °C |
| 6 Aug 2024, 11:00 | 14.7 | 14.7 °C |
| 5 Jul 2024, 09:48 | 11.7 | 11.7 °C |
| 12 Jun 2024, 09:26 | 10.9 | 10.9 °C |
| 8 May 2024, 11:48 | 12.1 | 12.1 °C |
| 8 Apr 2024, 08:42 | 9.2 | 9.2 °C |
pH
code 0061
7.62
Sampled 4 Mar 2025, 19 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Mar 2025, 11:33 | 7.62 | 7.62 |
| 17 Feb 2025, 13:08 | 7.66 | 7.66 |
| 8 Jan 2025, 12:42 | 7.64 | 7.64 |
| 3 Dec 2024, 11:42 | 7.5 | 7.5 |
| 5 Nov 2024, 11:39 | 7.41 | 7.41 |
| 11 Oct 2024, 12:42 | 7.58 | 7.58 |
| 24 Sep 2024, 11:22 | 7.73 | 7.73 |
| 6 Aug 2024, 11:00 | 7.47 | 7.47 |
| 5 Jul 2024, 09:48 | 7.41 | 7.41 |
| 12 Jun 2024, 09:26 | 7.64 | 7.64 |
| 8 May 2024, 11:48 | 7.66 | 7.66 |
| 8 Apr 2024, 08:42 | 7.62 | 7.62 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.16 mg/l
Sampled 4 Mar 2025, 19 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Mar 2025, 11:33 | 0.16 | 0.16 mg/l |
| 17 Feb 2025, 13:08 | 0.13 | 0.13 mg/l |
| 8 Jan 2025, 12:42 | 0.085 | 0.085 mg/l |
| 3 Dec 2024, 11:42 | 0.097 | 0.097 mg/l |
| 5 Nov 2024, 11:39 | 0.2 | 0.2 mg/l |
| 11 Oct 2024, 12:42 | 0.084 | 0.084 mg/l |
| 24 Sep 2024, 11:22 | 0.16 | 0.16 mg/l |
| 6 Aug 2024, 11:00 | 0.1 | 0.1 mg/l |
| 5 Jul 2024, 09:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Jun 2024, 09:26 | 0.18 | 0.18 mg/l |
| 8 May 2024, 11:48 | 0.092 | 0.092 mg/l |
| 8 Apr 2024, 08:42 | 0.069 | 0.069 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
1.27 mg/l
Sampled 4 Mar 2025, 19 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Mar 2025, 11:33 | 1.27 | 1.27 mg/l |
| 17 Feb 2025, 13:08 | 6.16 | 6.16 mg/l |
| 8 Jan 2025, 12:42 | 3.47 | 3.47 mg/l |
| 3 Dec 2024, 11:42 | 1.45 | 1.45 mg/l |
| 5 Nov 2024, 11:39 | 1.22 | 1.22 mg/l |
| 11 Oct 2024, 12:42 | 1.69 | 1.69 mg/l |
| 24 Sep 2024, 11:22 | 5.18 | 5.18 mg/l |
| 6 Aug 2024, 11:00 | 1.09 | 1.09 mg/l |
| 5 Jul 2024, 09:48 | <0.196 | below 0.196 mg/l (not detected above this) |
| 12 Jun 2024, 09:26 | 1.23 | 1.23 mg/l |
| 8 May 2024, 11:48 | 0.99 | 0.99 mg/l |
| 8 Apr 2024, 08:42 | 0.992 | 0.992 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.12 mg/l
Sampled 4 Mar 2025, 19 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Mar 2025, 11:33 | 0.12 | 0.12 mg/l |
| 17 Feb 2025, 13:08 | 0.17 | 0.17 mg/l |
| 8 Jan 2025, 12:42 | 0.045 | 0.045 mg/l |
| 3 Dec 2024, 11:42 | 0.051 | 0.051 mg/l |
| 5 Nov 2024, 11:39 | 0.2 | 0.2 mg/l |
| 11 Oct 2024, 12:42 | 0.06 | 0.06 mg/l |
| 24 Sep 2024, 11:22 | 0.27 | 0.27 mg/l |
| 6 Aug 2024, 11:00 | 0.077 | 0.077 mg/l |
| 5 Jul 2024, 09:48 | 2.4 | 2.4 mg/l |
| 12 Jun 2024, 09:26 | 0.42 | 0.42 mg/l |
| 8 May 2024, 11:48 | 0.18 | 0.18 mg/l |
| 8 Apr 2024, 08:42 | 0.028 | 0.028 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
432 µS/cm
Sampled 4 Mar 2025, 19 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Mar 2025, 11:33 | 432 | 432 µS/cm |
| 17 Feb 2025, 13:08 | 563 | 563 µS/cm |
| 8 Jan 2025, 12:42 | 515 | 515 µS/cm |
| 3 Dec 2024, 11:42 | 391 | 391 µS/cm |
| 5 Nov 2024, 11:39 | 484 | 484 µS/cm |
| 11 Oct 2024, 12:42 | 418 | 418 µS/cm |
| 24 Sep 2024, 11:22 | 400 | 400 µS/cm |
| 6 Aug 2024, 11:00 | 457 | 457 µS/cm |
| 5 Jul 2024, 09:48 | 750 | 750 µS/cm |
| 12 Jun 2024, 09:26 | 557 | 557 µS/cm |
| 8 May 2024, 11:48 | 390 | 390 µS/cm |
| 8 Apr 2024, 08:42 | 358 | 358 µS/cm |
Everything measured here
12 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 12 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 12 | Apr 2024 – Mar 2025 | 97.9% 4 Mar 2025 |
| Oxygen, Dissolved as O2 9924 | River water | 12 | Apr 2024 – Mar 2025 | 11.8 mg/l 4 Mar 2025 |
| Temperature of Water 0076 | River water | 12 | Apr 2024 – Mar 2025 | 7.1 °C 4 Mar 2025 |
| pH 0061 | River water | 12 | Apr 2024 – Mar 2025 | 7.62 4 Mar 2025 |
| Ammoniacal Nitrogen as N 0111 | River water | 12 | Apr 2024 – Mar 2025 | 0.16 mg/l 4 Mar 2025 |
| Nitrate as N 0117 | River water | 12 | Apr 2024 – Mar 2025 | 1.27 mg/l 4 Mar 2025 |
| Orthophosphate, reactive as P 0180 | River water | 12 | Apr 2024 – Mar 2025 | 0.12 mg/l 4 Mar 2025 |
| Conductivity at 25 C 0077 | River water | 12 | Apr 2024 – Mar 2025 | 432 µS/cm 4 Mar 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 12 | Apr 2024 – Mar 2025 | 110 mg/l 4 Mar 2025 |
| Ammonia un-ionised as N 0119 | River water | 12 | Apr 2024 – Mar 2025 | 0.00099 mg/l 4 Mar 2025 |
| Nitrite as N 0118 | River water | 12 | Apr 2024 – Mar 2025 | 0.032 mg/l 4 Mar 2025 |
| Nitrogen, Total Oxidised as N 0116 | River water | 12 | Apr 2024 – Mar 2025 | 1.3 mg/l 4 Mar 2025 |
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.