Corfheath Firs, Clamerkin Brook
EA name: CORFHEATH FIRS, CLAMERKIN BROOK
Environment Agency sampling point SO-Y0004528 · 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
- 24 Mar 2026, 11:526 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
- 25 since 2 Apr 2024 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Planned investigation (local monitoring)
- Where
- National Grid 444096, 90314As published, to the nearest 1 m. Open in a map
- River, by its own name
- Corfheath Firs
- River, by the map
- Not placedIts name gives Corfheath Firs; the only line close by, 2 m away, is Clamerkin Brook and is not traced into it. The river map cannot say which watercourse this is.
- Next gauge downstream
- Not known
- Why it was sampled
- Planned investigation (local monitoring) (25 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
105.1%
Sampled 24 Mar 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 24 Mar 2026, 11:52 | 105.1 | 105.1% |
| 25 Feb 2026, 10:58 | 100.3 | 100.3% |
| 22 Jan 2026, 10:38 | 100.7 | 100.7% |
| 9 Dec 2025, 13:29 | 95.3 | 95.3% |
| 11 Nov 2025, 11:02 | 95.9 | 95.9% |
| 24 Oct 2025, 10:35 | 97.3 | 97.3% |
| 24 Sep 2025, 15:02 | 105.6 | 105.6% |
| 13 Aug 2025, 10:10 | 34 | 34% |
| 2 Jul 2025, 10:19 | 18.1 | 18.1% |
| 4 Jun 2025, 11:55 | 93.1 | 93.1% |
| 9 May 2025, 09:51 | 72.2 | 72.2% |
| 1 Apr 2025, 10:13 | 120.9 | 120.9% |
| 3 Mar 2025, 10:11 | 103.5 | 103.5% |
| 4 Feb 2025, 09:52 | 100.1 | 100.1% |
| 16 Jan 2025, 10:14 | 98.8 | 98.8% |
| 16 Dec 2024, 10:18 | 88.5 | 88.5% |
| 6 Dec 2024, 09:04 | 97.4 | 97.4% |
| 26 Nov 2024, 10:42 | 97.6 | 97.6% |
| 30 Oct 2024, 09:51 | 78.8 | 78.8% |
| 30 Sep 2024, 09:46 | 94.7 | 94.7% |
| 23 Aug 2024, 08:37 | 64.7 | 64.7% |
| 26 Jul 2024, 08:57 | 43.7 | 43.7% |
| 12 Jun 2024, 11:11 | 112.5 | 112.5% |
| 30 May 2024, 08:30 | 91.2 | 91.2% |
| 2 Apr 2024, 12:31 | 100.2 | 100.2% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.9 mg/l
Sampled 24 Mar 2026, 6 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 24 Mar 2026, 11:52 | 11.9 | 11.9 mg/l |
| 25 Feb 2026, 10:58 | 11.3 | 11.3 mg/l |
| 22 Jan 2026, 10:38 | 11.8 | 11.8 mg/l |
| 9 Dec 2025, 13:29 | 10.5 | 10.5 mg/l |
| 11 Nov 2025, 11:02 | 10.2 | 10.2 mg/l |
| 24 Oct 2025, 10:35 | 10.6 | 10.6 mg/l |
| 24 Sep 2025, 15:02 | 11 | 11 mg/l |
| 13 Aug 2025, 10:10 | 3.06 | 3.06 mg/l |
| 2 Jul 2025, 10:19 | 1.57 | 1.57 mg/l |
| 4 Jun 2025, 11:55 | 8.67 | 8.67 mg/l |
| 9 May 2025, 09:51 | 7.71 | 7.71 mg/l |
| 1 Apr 2025, 10:13 | 13.2 | 13.2 mg/l |
| 3 Mar 2025, 10:11 | 13.4 | 13.4 mg/l |
| 4 Feb 2025, 09:52 | 12.1 | 12.1 mg/l |
| 16 Jan 2025, 10:14 | 12.4 | 12.4 mg/l |
| 16 Dec 2024, 10:18 | 10.3 | 10.3 mg/l |
| 6 Dec 2024, 09:04 | 11.3 | 11.3 mg/l |
| 26 Nov 2024, 10:42 | 11.3 | 11.3 mg/l |
| 30 Oct 2024, 09:51 | 8.15 | 8.15 mg/l |
| 30 Sep 2024, 09:46 | 9.67 | 9.67 mg/l |
| 23 Aug 2024, 08:37 | 6.19 | 6.19 mg/l |
| 26 Jul 2024, 08:57 | 4.19 | 4.19 mg/l |
| 12 Jun 2024, 11:11 | 11.3 | 11.3 mg/l |
| 30 May 2024, 08:30 | 9.44 | 9.44 mg/l |
Water temperature
code 0076 · °C
9.9 °C
Sampled 24 Mar 2026, 6 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 24 Mar 2026, 11:52 | 9.9 | 9.9 °C |
| 25 Feb 2026, 10:58 | 10 | 10 °C |
| 22 Jan 2026, 10:38 | 8.4 | 8.4 °C |
| 9 Dec 2025, 13:29 | 11.1 | 11.1 °C |
| 11 Nov 2025, 11:02 | 12.6 | 12.6 °C |
| 24 Oct 2025, 10:35 | 11.3 | 11.3 °C |
| 24 Sep 2025, 15:02 | 13.5 | 13.5 °C |
| 13 Aug 2025, 10:10 | 20.4 | 20.4 °C |
| 2 Jul 2025, 10:19 | 22.2 | 22.2 °C |
| 4 Jun 2025, 11:55 | 18.7 | 18.7 °C |
| 9 May 2025, 09:51 | 12.3 | 12.3 °C |
| 1 Apr 2025, 10:13 | 11.2 | 11.2 °C |
| 3 Mar 2025, 10:11 | 4.5 | 4.5 °C |
| 4 Feb 2025, 09:52 | 7.1 | 7.1 °C |
| 16 Jan 2025, 10:14 | 5.5 | 5.5 °C |
| 16 Dec 2024, 10:18 | 8.8 | 8.8 °C |
| 6 Dec 2024, 09:04 | 8.9 | 8.9 °C |
| 26 Nov 2024, 10:42 | 8.7 | 8.7 °C |
| 30 Oct 2024, 09:51 | 13.7 | 13.7 °C |
| 30 Sep 2024, 09:46 | 14.3 | 14.3 °C |
| 23 Aug 2024, 08:37 | 17.4 | 17.4 °C |
| 26 Jul 2024, 08:57 | 17.3 | 17.3 °C |
| 12 Jun 2024, 11:11 | 14.9 | 14.9 °C |
| 30 May 2024, 08:30 | 13.7 | 13.7 °C |
pH
code 0061
8.36
Sampled 24 Mar 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 24 Mar 2026, 11:52 | 8.36 | 8.36 |
| 25 Feb 2026, 10:58 | 8.22 | 8.22 |
| 22 Jan 2026, 10:38 | 7.85 | 7.85 |
| 9 Dec 2025, 13:29 | 7.61 | 7.61 |
| 11 Nov 2025, 11:02 | 7.85 | 7.85 |
| 24 Oct 2025, 10:35 | 7.95 | 7.95 |
| 24 Sep 2025, 15:02 | 8.05 | 8.05 |
| 13 Aug 2025, 10:10 | 7.46 | 7.46 |
| 2 Jul 2025, 10:19 | 7.32 | 7.32 |
| 4 Jun 2025, 11:55 | 7.82 | 7.82 |
| 9 May 2025, 09:51 | 7.84 | 7.84 |
| 1 Apr 2025, 10:13 | 8.22 | 8.22 |
| 3 Mar 2025, 10:11 | 8.34 | 8.34 |
| 4 Feb 2025, 09:52 | 8.08 | 8.08 |
| 16 Jan 2025, 10:14 | 8.08 | 8.08 |
| 16 Dec 2024, 10:18 | 7.61 | 7.61 |
| 6 Dec 2024, 09:04 | 7.84 | 7.84 |
| 26 Nov 2024, 10:42 | 7.78 | 7.78 |
| 30 Oct 2024, 09:51 | 7.56 | 7.56 |
| 30 Sep 2024, 09:46 | 7.45 | 7.45 |
| 23 Aug 2024, 08:37 | 7.59 | 7.59 |
| 26 Jul 2024, 08:57 | 7.61 | 7.61 |
| 12 Jun 2024, 11:11 | 8.27 | 8.27 |
| 30 May 2024, 08:30 | 8.25 | 8.25 |
| 2 Apr 2024, 12:31 | 8.13 | 8.13 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 24 Mar 2026, 6 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 24 Mar 2026, 11:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Feb 2026, 10:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Jan 2026, 10:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Dec 2025, 13:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Nov 2025, 11:02 | 0.037 | 0.037 mg/l |
| 24 Oct 2025, 10:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Sep 2025, 15:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Aug 2025, 10:10 | 0.57 | 0.57 mg/l |
| 2 Jul 2025, 10:19 | 0.57 | 0.57 mg/l |
| 4 Jun 2025, 11:55 | 0.35 | 0.35 mg/l |
| 9 May 2025, 09:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Apr 2025, 10:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Mar 2025, 10:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Feb 2025, 09:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jan 2025, 10:14 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Dec 2024, 10:18 | 0.046 | 0.046 mg/l |
| 6 Dec 2024, 09:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Oct 2024, 09:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Sep 2024, 09:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Aug 2024, 08:37 | 0.19 | 0.19 mg/l |
| 26 Jul 2024, 08:57 | 0.52 | 0.52 mg/l |
| 12 Jun 2024, 11:11 | 0.48 | 0.48 mg/l |
| 30 May 2024, 08:30 | 0.9 | 0.9 mg/l |
| 2 Apr 2024, 12:31 | 0.048 | 0.048 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
3.2 mg/l
Sampled 24 Mar 2026, 6 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 24 Mar 2026, 11:52 | 3.2 | 3.2 mg/l |
| 25 Feb 2026, 10:58 | 4.39 | 4.39 mg/l |
| 22 Jan 2026, 10:38 | 2.19 | 2.19 mg/l |
| 9 Dec 2025, 13:29 | 5.8 | 5.8 mg/l |
| 11 Nov 2025, 11:02 | 6.18 | 6.18 mg/l |
| 24 Oct 2025, 10:35 | 12 | 12 mg/l |
| 24 Sep 2025, 15:02 | 3.39 | 3.39 mg/l |
| 13 Aug 2025, 10:10 | 0.181 | 0.181 mg/l |
| 2 Jul 2025, 10:19 | 0.183 | 0.183 mg/l |
| 4 Jun 2025, 11:55 | <0.196 | below 0.196 mg/l (not detected above this) |
| 9 May 2025, 09:51 | 0.736 | 0.736 mg/l |
| 1 Apr 2025, 10:13 | 1.9 | 1.9 mg/l |
| 3 Mar 2025, 10:11 | 4.49 | 4.49 mg/l |
| 4 Feb 2025, 09:52 | 4.49 | 4.49 mg/l |
| 16 Jan 2025, 10:14 | 5.19 | 5.19 mg/l |
| 16 Dec 2024, 10:18 | 4.09 | 4.09 mg/l |
| 6 Dec 2024, 09:04 | 1.7 | 1.7 mg/l |
| 30 Oct 2024, 09:51 | 11 | 11 mg/l |
| 30 Sep 2024, 09:46 | 21 | 21 mg/l |
| 23 Aug 2024, 08:37 | 0.476 | 0.476 mg/l |
| 26 Jul 2024, 08:57 | 0.365 | 0.365 mg/l |
| 12 Jun 2024, 11:11 | 0.216 | 0.216 mg/l |
| 30 May 2024, 08:30 | 0.876 | 0.876 mg/l |
| 2 Apr 2024, 12:31 | 1.98 | 1.98 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.029 mg/l
Sampled 24 Mar 2026, 6 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 24 Mar 2026, 11:52 | 0.029 | 0.029 mg/l |
| 25 Feb 2026, 10:58 | 0.11 | 0.11 mg/l |
| 22 Jan 2026, 10:38 | 0.14 | 0.14 mg/l |
| 9 Dec 2025, 13:29 | 0.21 | 0.21 mg/l |
| 11 Nov 2025, 11:02 | 0.28 | 0.28 mg/l |
| 24 Oct 2025, 10:35 | 0.18 | 0.18 mg/l |
| 24 Sep 2025, 15:02 | 0.074 | 0.074 mg/l |
| 13 Aug 2025, 10:10 | 0.029 | 0.029 mg/l |
| 2 Jul 2025, 10:19 | 0.037 | 0.037 mg/l |
| 4 Jun 2025, 11:55 | 0.012 | 0.012 mg/l |
| 9 May 2025, 09:51 | 0.049 | 0.049 mg/l |
| 1 Apr 2025, 10:13 | <0.01 | below 0.01 mg/l (not detected above this) |
| 3 Mar 2025, 10:11 | 0.039 | 0.039 mg/l |
| 4 Feb 2025, 09:52 | 0.048 | 0.048 mg/l |
| 16 Jan 2025, 10:14 | 0.056 | 0.056 mg/l |
| 16 Dec 2024, 10:18 | 0.046 | 0.046 mg/l |
| 6 Dec 2024, 09:04 | 0.016 | 0.016 mg/l |
| 30 Oct 2024, 09:51 | 0.07 | 0.07 mg/l |
| 30 Sep 2024, 09:46 | 0.25 | 0.25 mg/l |
| 23 Aug 2024, 08:37 | 0.064 | 0.064 mg/l |
| 26 Jul 2024, 08:57 | 0.07 | 0.07 mg/l |
| 12 Jun 2024, 11:11 | 0.016 | 0.016 mg/l |
| 30 May 2024, 08:30 | 0.074 | 0.074 mg/l |
| 2 Apr 2024, 12:31 | 0.028 | 0.028 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
999 µS/cm
Sampled 24 Mar 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 24 Mar 2026, 11:52 | 999 | 999 µS/cm |
| 25 Feb 2026, 10:58 | 539 | 539 µS/cm |
| 22 Jan 2026, 10:38 | 349 | 349 µS/cm |
| 9 Dec 2025, 13:29 | 297 | 297 µS/cm |
| 11 Nov 2025, 11:02 | 442 | 442 µS/cm |
| 24 Oct 2025, 10:35 | 504 | 504 µS/cm |
| 24 Sep 2025, 15:02 | 48965 | 48965 µS/cm |
| 13 Aug 2025, 10:10 | 51445 | 51445 µS/cm |
| 2 Jul 2025, 10:19 | 49238 | 49238 µS/cm |
| 4 Jun 2025, 11:55 | 46659 | 46659 µS/cm |
| 9 May 2025, 09:51 | 46924 | 46924 µS/cm |
| 1 Apr 2025, 10:13 | 48488 | 48488 µS/cm |
| 3 Mar 2025, 10:11 | 934 | 934 µS/cm |
| 4 Feb 2025, 09:52 | 836 | 836 µS/cm |
| 16 Jan 2025, 10:14 | 2973 | 2973 µS/cm |
| 16 Dec 2024, 10:18 | 33440 | 33440 µS/cm |
| 6 Dec 2024, 09:04 | 398 | 398 µS/cm |
| 26 Nov 2024, 10:42 | 358 | 358 µS/cm |
| 30 Oct 2024, 09:51 | 27768 | 27768 µS/cm |
| 30 Sep 2024, 09:46 | 417 | 417 µS/cm |
| 23 Aug 2024, 08:37 | 48300 | 48300 µS/cm |
| 26 Jul 2024, 08:57 | 47960 | 47960 µS/cm |
| 12 Jun 2024, 11:11 | 42370 | 42370 µS/cm |
| 30 May 2024, 08:30 | 2833 | 2833 µS/cm |
| 2 Apr 2024, 12:31 | 370 | 370 µS/cm |
Everything measured here
19 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 19 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 25 | Apr 2024 – Mar 2026 | 105.1% 24 Mar 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 24 | May 2024 – Mar 2026 | 11.9 mg/l 24 Mar 2026 |
| Temperature of Water 0076 | River water | 24 | May 2024 – Mar 2026 | 9.9 °C 24 Mar 2026 |
| pH 0061 | River water | 25 | Apr 2024 – Mar 2026 | 8.36 24 Mar 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 24 | Apr 2024 – Mar 2026 | below 0.03 mg/l 24 Mar 2026 |
| Nitrate as N 0117 | River water | 24 | Apr 2024 – Mar 2026 | 3.2 mg/l 24 Mar 2026 |
| Orthophosphate, reactive as P 0180 | River water | 24 | Apr 2024 – Mar 2026 | 0.029 mg/l 24 Mar 2026 |
| Conductivity at 25 C 0077 | River water | 25 | Apr 2024 – Mar 2026 | 999 µS/cm 24 Mar 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 19 | Sep 2024 – Mar 2026 | 200 mg/l 24 Mar 2026 |
| Ammonia un-ionised as N 0119 | River water | 23 | May 2024 – Mar 2026 | below 0.00054 mg/l 24 Mar 2026 |
| BOD : 5 Day ATU 0085 | River water | 22 | Apr 2024 – Mar 2026 | 1.3 mg/l 24 Mar 2026 |
| Nitrite as N 0118 | River water | 24 | Apr 2024 – Mar 2026 | 0.0043 mg/l 24 Mar 2026 |
| Nitrogen, Kjeldahl as N 0114 | River water | 21 | Apr 2024 – Mar 2026 | 0.4 mg/l 24 Mar 2026 |
| Nitrogen, Organic as N 0113 | River water | 21 | Apr 2024 – Mar 2026 | 0.37 mg/l 24 Mar 2026 |
| Nitrogen, Total as N 9686 | River water | 23 | Apr 2024 – Mar 2026 | 3.6 mg/l 24 Mar 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 24 | Apr 2024 – Mar 2026 | 3.2 mg/l 24 Mar 2026 |
| Phosphate :- {TIP} 0192 | River water | 24 | Apr 2024 – Mar 2026 | 0.033 mg/l 24 Mar 2026 |
| Phosphorus, Total as P 0348 | River water | 23 | Apr 2024 – Mar 2026 | 0.034 mg/l 24 Mar 2026 |
| Solids, Suspended at 105 C 0135 | River water | 23 | Apr 2024 – Mar 2026 | 7.9 mg/l 24 Mar 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.