Dalch at North Leigh Copse
EA name: RSN1443 DALCH AT NORTH LEIGH COPSE
Environment Agency sampling point SW-RSN1443 · 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 Dec 2025, 10:1610 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
- 11 since 22 Jan 2025 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 275881, 110034As published, to the nearest 1 m. Open in a map
- River, by its own name
- Dalch
- River, by the map
- River DalchPlaced on the river its name gives, 2 m from the line.
- Next gauge downstream
- Lapford On the River Yeo · 7.0 km along the river
- Why it was sampled
- Monitoring (national agency policy) (11 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
98.3%
Sampled 4 Dec 2025, 10 months ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Dec 2025, 10:16 | 98.3 | 98.3% |
| 20 Nov 2025, 14:05 | 91.8 | 91.8% |
| 6 Oct 2025, 10:26 | 89 | 89% |
| 17 Sep 2025, 11:31 | 90 | 90% |
| 18 Aug 2025, 09:32 | 60.2 | 60.2% |
| 4 Jul 2025, 10:45 | 94.7 | 94.7% |
| 12 Jun 2025, 11:21 | 80.4 | 80.4% |
| 30 May 2025, 11:18 | 86.8 | 86.8% |
| 27 Mar 2025, 11:11 | 99 | 99% |
| 7 Feb 2025, 14:09 | 99.1 | 99.1% |
| 22 Jan 2025, 16:29 | 97.2 | 97.2% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.6 mg/l
Sampled 4 Dec 2025, 10 months ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Dec 2025, 10:16 | 11.6 | 11.6 mg/l |
| 20 Nov 2025, 14:05 | 11.2 | 11.2 mg/l |
| 6 Oct 2025, 10:26 | 9.75 | 9.75 mg/l |
| 17 Sep 2025, 11:31 | 9.33 | 9.33 mg/l |
| 18 Aug 2025, 09:32 | 5.96 | 5.96 mg/l |
| 4 Jul 2025, 10:45 | 9.32 | 9.32 mg/l |
| 12 Jun 2025, 11:21 | 8.25 | 8.25 mg/l |
| 30 May 2025, 11:18 | 8.77 | 8.77 mg/l |
| 27 Mar 2025, 11:11 | 11.6 | 11.6 mg/l |
| 7 Feb 2025, 14:09 | 12.8 | 12.8 mg/l |
| 22 Jan 2025, 16:29 | 12.2 | 12.2 mg/l |
Water temperature
code 0076 · °C
8.2 °C
Sampled 4 Dec 2025, 10 months ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Dec 2025, 10:16 | 8.2 | 8.2 °C |
| 20 Nov 2025, 14:05 | 6.8 | 6.8 °C |
| 6 Oct 2025, 10:26 | 11.2 | 11.2 °C |
| 17 Sep 2025, 11:31 | 13.6 | 13.6 °C |
| 18 Aug 2025, 09:32 | 15.7 | 15.7 °C |
| 4 Jul 2025, 10:45 | 16 | 16 °C |
| 12 Jun 2025, 11:21 | 14.1 | 14.1 °C |
| 30 May 2025, 11:18 | 14.8 | 14.8 °C |
| 27 Mar 2025, 11:11 | 8.4 | 8.4 °C |
| 7 Feb 2025, 14:09 | 4.4 | 4.4 °C |
| 22 Jan 2025, 16:29 | 5.5 | 5.5 °C |
pH
code 0061
7.4
Sampled 4 Dec 2025, 10 months ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Dec 2025, 10:16 | 7.4 | 7.4 |
| 20 Nov 2025, 14:05 | 7.57 | 7.57 |
| 6 Oct 2025, 10:26 | 7.51 | 7.51 |
| 17 Sep 2025, 11:31 | 7.28 | 7.28 |
| 18 Aug 2025, 09:32 | 7.47 | 7.47 |
| 4 Jul 2025, 10:45 | 7.92 | 7.92 |
| 12 Jun 2025, 11:21 | 7.48 | 7.48 |
| 30 May 2025, 11:18 | 7.64 | 7.64 |
| 27 Mar 2025, 11:11 | 7.71 | 7.71 |
| 7 Feb 2025, 14:09 | 7.86 | 7.86 |
| 22 Jan 2025, 16:29 | 7.74 | 7.74 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 4 Dec 2025, 10 months ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Dec 2025, 10:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Nov 2025, 14:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Oct 2025, 10:26 | 0.082 | 0.082 mg/l |
| 17 Sep 2025, 11:31 | 0.13 | 0.13 mg/l |
| 18 Aug 2025, 09:32 | 0.03 | 0.03 mg/l |
| 4 Jul 2025, 10:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Jun 2025, 11:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 May 2025, 11:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 Mar 2025, 11:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Feb 2025, 14:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Jan 2025, 16:29 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
4.29 mg/l
Sampled 4 Dec 2025, 10 months ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Dec 2025, 10:16 | 4.29 | 4.29 mg/l |
| 20 Nov 2025, 14:05 | 4.1 | 4.1 mg/l |
| 6 Oct 2025, 10:26 | 4.25 | 4.25 mg/l |
| 17 Sep 2025, 11:31 | 5.6 | 5.6 mg/l |
| 18 Aug 2025, 09:32 | 2.59 | 2.59 mg/l |
| 4 Jul 2025, 10:45 | 1.6 | 1.6 mg/l |
| 12 Jun 2025, 11:21 | 1.5 | 1.5 mg/l |
| 30 May 2025, 11:18 | 1.89 | 1.89 mg/l |
| 27 Mar 2025, 11:11 | 2 | 2 mg/l |
| 7 Feb 2025, 14:09 | 3.19 | 3.19 mg/l |
| 22 Jan 2025, 16:29 | 3 | 3 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.053 mg/l
Sampled 4 Dec 2025, 10 months ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Dec 2025, 10:16 | 0.053 | 0.053 mg/l |
| 20 Nov 2025, 14:05 | 0.047 | 0.047 mg/l |
| 6 Oct 2025, 10:26 | 0.14 | 0.14 mg/l |
| 17 Sep 2025, 11:31 | 0.11 | 0.11 mg/l |
| 18 Aug 2025, 09:32 | 0.41 | 0.41 mg/l |
| 4 Jul 2025, 10:45 | 0.12 | 0.12 mg/l |
| 12 Jun 2025, 11:21 | 0.11 | 0.11 mg/l |
| 30 May 2025, 11:18 | 0.12 | 0.12 mg/l |
| 27 Mar 2025, 11:11 | 0.052 | 0.052 mg/l |
| 7 Feb 2025, 14:09 | 0.032 | 0.032 mg/l |
| 22 Jan 2025, 16:29 | 0.038 | 0.038 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
186 µS/cm
Sampled 4 Dec 2025, 10 months ago · 11 results banked
Every result (11)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Dec 2025, 10:16 | 186 | 186 µS/cm |
| 20 Nov 2025, 14:05 | 191 | 191 µS/cm |
| 6 Oct 2025, 10:26 | 261 | 261 µS/cm |
| 17 Sep 2025, 11:31 | 243 | 243 µS/cm |
| 18 Aug 2025, 09:32 | 311 | 311 µS/cm |
| 4 Jul 2025, 10:45 | 228 | 228 µS/cm |
| 12 Jun 2025, 11:21 | 225 | 225 µS/cm |
| 30 May 2025, 11:18 | 229 | 229 µS/cm |
| 27 Mar 2025, 11:11 | 205 | 205 µS/cm |
| 7 Feb 2025, 14:09 | 177 | 177 µS/cm |
| 22 Jan 2025, 16:29 | 189 | 189 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 | 11 | Jan 2025 – Dec 2025 | 98.3% 4 Dec 2025 |
| Oxygen, Dissolved as O2 9924 | River water | 11 | Jan 2025 – Dec 2025 | 11.6 mg/l 4 Dec 2025 |
| Temperature of Water 0076 | River water | 11 | Jan 2025 – Dec 2025 | 8.2 °C 4 Dec 2025 |
| pH 0061 | River water | 11 | Jan 2025 – Dec 2025 | 7.4 4 Dec 2025 |
| Ammoniacal Nitrogen as N 0111 | River water | 11 | Jan 2025 – Dec 2025 | below 0.03 mg/l 4 Dec 2025 |
| Nitrate as N 0117 | River water | 11 | Jan 2025 – Dec 2025 | 4.29 mg/l 4 Dec 2025 |
| Orthophosphate, reactive as P 0180 | River water | 11 | Jan 2025 – Dec 2025 | 0.053 mg/l 4 Dec 2025 |
| Conductivity at 25 C 0077 | River water | 11 | Jan 2025 – Dec 2025 | 186 µS/cm 4 Dec 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 11 | Jan 2025 – Dec 2025 | 35 mg/l 4 Dec 2025 |
| Ammonia un-ionised as N 0119 | River water | 11 | Jan 2025 – Dec 2025 | below 0.00012 mg/l 4 Dec 2025 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 10 | Jan 2025 – Dec 2025 | 5.1 mg/l 4 Dec 2025 |
| Chloride 0172 | River water | 11 | Jan 2025 – Dec 2025 | 18 mg/l 4 Dec 2025 |
| Flow Type 2896 | River water | 11 | Jan 2025 – Dec 2025 | High Flow 4 Dec 2025 |
| Nitrite as N 0118 | River water | 11 | Jan 2025 – Dec 2025 | 0.007 mg/l 4 Dec 2025 |
| Nitrogen, Total as N 9686 | River water | 11 | Jan 2025 – Dec 2025 | 5.1 mg/l 4 Dec 2025 |
| Nitrogen, Total Oxidised as N 0116 | River water | 11 | Jan 2025 – Dec 2025 | 4.3 mg/l 4 Dec 2025 |
| Phosphorus, Total as P 0348 | River water | 11 | Jan 2025 – Dec 2025 | 0.08 mg/l 4 Dec 2025 |
| Silica, reactive as SiO2 0182 | River water | 11 | Jan 2025 – Dec 2025 | 5.9 mg/l 4 Dec 2025 |
| Solids, Suspended at 105 C 0135 | River water | 1 | Dec 2025 – Dec 2025 | 12 mg/l 4 Dec 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.