Cholwell Brook at Wheal Betsy
EA name: CHOLWELL BROOK AT WHEAL BETSY
Environment Agency sampling point SW-81232721 · 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
- 12 Nov 2025, 12:2511 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
- 17 since 6 Oct 2023 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 250994, 81114As published, to the nearest 1 m. Open in a map
- River, by its own name
- Cholwell Brook
- River, by the map
- Cholwell BrookPlaced on the river its name gives, 1 m from the line.
- Next gauge downstream
- Tavistock On the River Tavy · 8.8 km along the river
- Why it was sampled
- Monitoring (national agency policy) (13 samples)
Planned investigation (local monitoring) (4 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
100.3%
Sampled 12 Nov 2025, 11 months ago · 4 results banked
Every result (4)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Nov 2025, 12:25 | 100.3 | 100.3% |
| 25 Sep 2025, 12:50 | 98.4 | 98.4% |
| 30 Jul 2025, 11:45 | 103.4 | 103.4% |
| 29 May 2025, 11:20 | 105.4 | 105.4% |
Water temperature
code 0076 · °C
12.1 °C
Sampled 12 Nov 2025, 11 months ago · 4 results banked
Every result (4)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Nov 2025, 12:25 | 12.1 | 12.1 °C |
| 25 Sep 2025, 12:50 | 12 | 12 °C |
| 30 Jul 2025, 11:45 | 15.7 | 15.7 °C |
| 29 May 2025, 11:20 | 13.7 | 13.7 °C |
pH
code 0061
5.61
Sampled 12 Nov 2025, 11 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Nov 2025, 12:25 | 5.61 | 5.61 |
| 25 Sep 2025, 12:50 | 6.18 | 6.18 |
| 30 Jul 2025, 11:45 | 6.84 | 6.84 |
| 29 May 2025, 11:20 | 6.21 | 6.21 |
| 26 Mar 2024, 12:51 | 6.3 | 6.3 |
| 12 Mar 2024, 13:42 | 6.65 | 6.65 |
| 28 Feb 2024, 10:20 | 6.36 | 6.36 |
| 15 Feb 2024, 12:33 | 6.4 | 6.4 |
| 5 Feb 2024, 12:57 | 6.68 | 6.68 |
| 17 Jan 2024, 11:10 | 6.5 | 6.5 |
| 10 Jan 2024, 14:11 | 6.65 | 6.65 |
| 18 Dec 2023, 11:37 | 6.42 | 6.42 |
| 6 Dec 2023, 10:54 | 6.17 | 6.17 |
| 22 Nov 2023, 11:44 | 6.56 | 6.56 |
| 1 Nov 2023, 11:57 | 5.87 | 5.87 |
| 16 Oct 2023, 12:01 | 6.96 | 6.96 |
| 6 Oct 2023, 14:23 | 6.47 | 6.47 |
Conductivity
at 25 °C · code 0077 · µS/cm
44 µS/cm
Sampled 12 Nov 2025, 11 months ago · 4 results banked
Every result (4)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Nov 2025, 12:25 | 44 | 44 µS/cm |
| 25 Sep 2025, 12:50 | 53 | 53 µS/cm |
| 30 Jul 2025, 11:45 | 57 | 57 µS/cm |
| 29 May 2025, 11:20 | 57 | 57 µS/cm |
Everything measured here
43 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 43 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 4 | May 2025 – Nov 2025 | 100.3% 12 Nov 2025 |
| Temperature of Water 0076 | River water | 4 | May 2025 – Nov 2025 | 12.1 °C 12 Nov 2025 |
| pH 0061 | River water | 17 | Oct 2023 – Nov 2025 | 5.61 12 Nov 2025 |
| Conductivity at 25 C 0077 | River water | 4 | May 2025 – Nov 2025 | 44 µS/cm 12 Nov 2025 |
| Aluminium 6057 | River water | 4 | May 2025 – Nov 2025 | 320 µg/l 12 Nov 2025 |
| Aluminium, Dissolved 6037 | River water | 17 | Oct 2023 – Nov 2025 | 120 µg/l 12 Nov 2025 |
| Arsenic 6046 | River water | 4 | May 2025 – Nov 2025 | 3.1 µg/l 12 Nov 2025 |
| Arsenic, Dissolved 6045 | River water | 4 | May 2025 – Nov 2025 | 1.2 µg/l 12 Nov 2025 |
| Barium 6062 | River water | 4 | May 2025 – Nov 2025 | below 10 µg/l 12 Nov 2025 |
| Barium, Dissolved 9446 | River water | 4 | May 2025 – Nov 2025 | below 10 µg/l 12 Nov 2025 |
| Boron 6059 | River water | 4 | May 2025 – Nov 2025 | below 100 µg/l 12 Nov 2025 |
| Boron, Dissolved 9447 | River water | 4 | May 2025 – Nov 2025 | below 100 µg/l 12 Nov 2025 |
| Cadmium 0108 | River water | 4 | May 2025 – Nov 2025 | 1 µg/l 12 Nov 2025 |
| Cadmium, Dissolved 0106 | River water | 17 | Oct 2023 – Nov 2025 | 1 µg/l 12 Nov 2025 |
| Calcium 0241 | River water | 4 | May 2025 – Nov 2025 | 1.1 mg/l 12 Nov 2025 |
| Calcium, Dissolved 0239 | River water | 17 | Oct 2023 – Nov 2025 | 1 mg/l 12 Nov 2025 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 17 | Oct 2023 – Nov 2025 | 3.1 mg/l 12 Nov 2025 |
| Chromium 3164 | River water | 4 | May 2025 – Nov 2025 | 0.57 µg/l 12 Nov 2025 |
| Chromium, Dissolved 3409 | River water | 17 | Oct 2023 – Nov 2025 | below 0.5 µg/l 12 Nov 2025 |
| Copper 6452 | River water | 4 | May 2025 – Nov 2025 | 7.3 µg/l 12 Nov 2025 |
| Copper, Dissolved 6450 | River water | 17 | Oct 2023 – Nov 2025 | 6.4 µg/l 12 Nov 2025 |
| Hardness, Total as CaCO3 0158 | River water | 4 | May 2025 – Nov 2025 | 5.79 mg/l 12 Nov 2025 |
| Iron 6051 | River water | 4 | May 2025 – Nov 2025 | 320 µg/l 12 Nov 2025 |
| Iron, Dissolved 6460 | River water | 4 | May 2025 – Nov 2025 | 88 µg/l 12 Nov 2025 |
| Lead, Dissolved 0052 | River water | 17 | Oct 2023 – Nov 2025 | 36 µg/l 12 Nov 2025 |
| Lithium 6064 | River water | 4 | May 2025 – Nov 2025 | below 100 µg/l 12 Nov 2025 |
| Lithium, Dissolved 4201 | River water | 4 | May 2025 – Nov 2025 | below 100 µg/l 12 Nov 2025 |
| Magnesium 0237 | River water | 4 | May 2025 – Nov 2025 | 0.83 mg/l 12 Nov 2025 |
| Magnesium, Dissolved 0235 | River water | 17 | Oct 2023 – Nov 2025 | 0.8 mg/l 12 Nov 2025 |
| Manganese 6050 | River water | 4 | May 2025 – Nov 2025 | 34 µg/l 12 Nov 2025 |
| Manganese, Dissolved 6458 | River water | 4 | May 2025 – Nov 2025 | 30 µg/l 12 Nov 2025 |
| Nickel, Dissolved 3410 | River water | 17 | Oct 2023 – Nov 2025 | 1.5 µg/l 12 Nov 2025 |
| Potassium 0211 | River water | 4 | May 2025 – Nov 2025 | 0.85 mg/l 12 Nov 2025 |
| Potassium, Dissolved 0209 | River water | 4 | May 2025 – Nov 2025 | 0.84 mg/l 12 Nov 2025 |
| Sodium 0207 | River water | 4 | May 2025 – Nov 2025 | 4.9 mg/l 12 Nov 2025 |
| Sodium, Dissolved 0205 | River water | 4 | May 2025 – Nov 2025 | 4.9 mg/l 12 Nov 2025 |
| Solids, Suspended at 105 C 0135 | River water | 4 | May 2025 – Nov 2025 | 29 mg/l 12 Nov 2025 |
| Strontium 6063 | River water | 4 | May 2025 – Nov 2025 | below 20 µg/l 12 Nov 2025 |
| Strontium, Filtered 6693 | River water | 4 | May 2025 – Nov 2025 | below 20 µg/l 12 Nov 2025 |
| Sulphate as SO4 0183 | River water | 4 | May 2025 – Nov 2025 | below 10 mg/l 12 Nov 2025 |
| Sulphate, Dissolved as SO4 7859 | River water | 4 | May 2025 – Nov 2025 | below 10 mg/l 12 Nov 2025 |
| Zinc 6455 | River water | 4 | May 2025 – Nov 2025 | 140 µg/l 12 Nov 2025 |
| Zinc, Dissolved 3408 | River water | 17 | Oct 2023 – Nov 2025 | 140 µg/l 12 Nov 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.