Carnon River at Chacewater Viaduct
EA name: CARNON RIVER AT CHACEWATER VIADUCT
Environment Agency sampling point SW-81950659 · 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
- 2 Sep 2026, 14:4629 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 26 since 11 Oct 2023 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Environmental monitoring statutory (EU directives)
- Where
- National Grid 174438, 45220As published, to the nearest 1 m. Open in a map
- River, by its own name
- Carnon
- River, by the map
- Not placedNo mapped watercourse within 500 m. The river map cannot say which watercourse this is.
- Next gauge downstream
- Not known
- Why it was sampled
- Monitoring (national agency policy) (13 samples)
Environmental monitoring statutory (EU directives) (13 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
95.7%
Sampled 2 Sep 2026, 29 days ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 14:46 | 95.7 | 95.7% |
| 11 Aug 2026, 09:12 | 84.2 | 84.2% |
| 14 Jul 2026, 10:12 | 100.8 | 100.8% |
| 4 Jun 2026, 09:56 | 92 | 92% |
| 8 May 2026, 13:18 | 95.3 | 95.3% |
| 1 Apr 2026, 13:25 | 96.1 | 96.1% |
| 9 Mar 2026, 09:03 | 91.5 | 91.5% |
| 6 Feb 2026, 12:31 | 93.2 | 93.2% |
| 2 Jan 2026, 10:23 | 90 | 90% |
| 1 Dec 2025, 09:05 | 89.4 | 89.4% |
| 3 Nov 2025, 12:28 | 89.6 | 89.6% |
| 8 Oct 2025, 13:42 | 94.4 | 94.4% |
| 3 Apr 2025, 09:51 | 94.4 | 94.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.21 mg/l
Sampled 2 Sep 2026, 29 days ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 14:46 | 9.21 | 9.21 mg/l |
| 11 Aug 2026, 09:12 | 8.83 | 8.83 mg/l |
| 14 Jul 2026, 10:12 | 9.76 | 9.76 mg/l |
| 4 Jun 2026, 09:56 | 9.65 | 9.65 mg/l |
| 8 May 2026, 13:18 | 10 | 10 mg/l |
| 1 Apr 2026, 13:25 | 10.4 | 10.4 mg/l |
| 9 Mar 2026, 09:03 | 10 | 10 mg/l |
| 6 Feb 2026, 12:31 | 10.2 | 10.2 mg/l |
| 2 Jan 2026, 10:23 | 10 | 10 mg/l |
| 1 Dec 2025, 09:05 | 9.66 | 9.66 mg/l |
| 3 Nov 2025, 12:28 | 9.4 | 9.4 mg/l |
| 8 Oct 2025, 13:42 | 9.83 | 9.83 mg/l |
| 3 Apr 2025, 09:51 | 10.5 | 10.5 mg/l |
Water temperature
code 0076 · °C
17.1 °C
Sampled 2 Sep 2026, 29 days ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 14:46 | 17.1 | 17.1 °C |
| 11 Aug 2026, 09:12 | 13.1 | 13.1 °C |
| 14 Jul 2026, 10:12 | 16.8 | 16.8 °C |
| 4 Jun 2026, 09:56 | 13.1 | 13.1 °C |
| 8 May 2026, 13:18 | 13 | 13 °C |
| 1 Apr 2026, 13:25 | 11.7 | 11.7 °C |
| 9 Mar 2026, 09:03 | 11.3 | 11.3 °C |
| 6 Feb 2026, 12:31 | 11.3 | 11.3 °C |
| 2 Jan 2026, 10:23 | 10.5 | 10.5 °C |
| 1 Dec 2025, 09:05 | 11.8 | 11.8 °C |
| 3 Nov 2025, 12:28 | 13.1 | 13.1 °C |
| 8 Oct 2025, 13:42 | 13.4 | 13.4 °C |
| 3 Apr 2025, 09:51 | 10.7 | 10.7 °C |
pH
code 0061
7.48
Sampled 2 Sep 2026, 29 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 14:46 | 7.48 | 7.48 |
| 11 Aug 2026, 09:12 | 7.5 | 7.5 |
| 14 Jul 2026, 10:12 | 7.53 | 7.53 |
| 4 Jun 2026, 09:56 | 7.1 | 7.1 |
| 8 May 2026, 13:18 | 7.25 | 7.25 |
| 1 Apr 2026, 13:25 | 7.13 | 7.13 |
| 9 Mar 2026, 09:03 | 6.75 | 6.75 |
| 6 Feb 2026, 12:31 | 6.6 | 6.6 |
| 2 Jan 2026, 10:23 | 6.65 | 6.65 |
| 1 Dec 2025, 09:05 | 6.67 | 6.67 |
| 3 Nov 2025, 12:28 | 6.93 | 6.93 |
| 8 Oct 2025, 13:42 | 7.3 | 7.3 |
| 3 Apr 2025, 09:51 | 6.99 | 6.99 |
| 25 Mar 2024, 11:17 | 7 | 7 |
| 13 Mar 2024, 11:54 | 6.9 | 6.9 |
| 21 Feb 2024, 11:17 | 6.8 | 6.8 |
| 8 Feb 2024, 14:35 | 6.7 | 6.7 |
| 26 Jan 2024, 09:28 | 6.8 | 6.8 |
| 15 Jan 2024, 09:26 | 6.8 | 6.8 |
| 9 Jan 2024, 10:28 | 6.7 | 6.7 |
| 18 Dec 2023, 08:53 | 7.4 | 7.4 |
| 1 Dec 2023, 12:54 | 6.8 | 6.8 |
| 20 Nov 2023, 09:42 | 6.8 | 6.8 |
| 15 Nov 2023, 12:06 | 6.8 | 6.8 |
| 27 Oct 2023, 16:47 | 7 | 7 |
| 11 Oct 2023, 09:42 | 7.2 | 7.2 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 2 Sep 2026, 29 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 14:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Aug 2026, 09:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Jul 2026, 10:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Jun 2026, 09:56 | 0.082 | 0.082 mg/l |
| 8 May 2026, 13:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Apr 2026, 13:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Mar 2026, 09:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Feb 2026, 12:31 | 0.055 | 0.055 mg/l |
| 2 Jan 2026, 10:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Dec 2025, 09:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Nov 2025, 12:28 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Oct 2025, 13:42 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
21 mg/l
Sampled 2 Sep 2026, 29 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 14:46 | 21 | 21 mg/l |
| 11 Aug 2026, 09:12 | 20 | 20 mg/l |
| 14 Jul 2026, 10:12 | 9.8 | 9.8 mg/l |
| 4 Jun 2026, 09:56 | 9.21 | 9.21 mg/l |
| 8 May 2026, 13:18 | 7.69 | 7.69 mg/l |
| 1 Apr 2026, 13:25 | 6.89 | 6.89 mg/l |
| 9 Mar 2026, 09:03 | 5.1 | 5.1 mg/l |
| 6 Feb 2026, 12:31 | 4.89 | 4.89 mg/l |
| 2 Jan 2026, 10:23 | 6.68 | 6.68 mg/l |
| 1 Dec 2025, 09:05 | 4.89 | 4.89 mg/l |
| 3 Nov 2025, 12:28 | 5 | 5 mg/l |
| 8 Oct 2025, 13:42 | 7.9 | 7.9 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
2.7 mg/l
Sampled 2 Sep 2026, 29 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 14:46 | 2.7 | 2.7 mg/l |
| 11 Aug 2026, 09:12 | 2.2 | 2.2 mg/l |
| 14 Jul 2026, 10:12 | 0.87 | 0.87 mg/l |
| 4 Jun 2026, 09:56 | 0.72 | 0.72 mg/l |
| 8 May 2026, 13:18 | 0.47 | 0.47 mg/l |
| 1 Apr 2026, 13:25 | 0.19 | 0.19 mg/l |
| 9 Mar 2026, 09:03 | 0.044 | 0.044 mg/l |
| 6 Feb 2026, 12:31 | 0.04 | 0.04 mg/l |
| 2 Jan 2026, 10:23 | 0.19 | 0.19 mg/l |
| 1 Dec 2025, 09:05 | 0.08 | 0.08 mg/l |
| 3 Nov 2025, 12:28 | 0.17 | 0.17 mg/l |
| 8 Oct 2025, 13:42 | 0.5 | 0.5 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
531 µS/cm
Sampled 2 Sep 2026, 29 days ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 2 Sep 2026, 14:46 | 531 | 531 µS/cm |
| 11 Aug 2026, 09:12 | 566 | 566 µS/cm |
| 14 Jul 2026, 10:12 | 417 | 417 µS/cm |
| 4 Jun 2026, 09:56 | 362 | 362 µS/cm |
| 8 May 2026, 13:18 | 356 | 356 µS/cm |
| 1 Apr 2026, 13:25 | 325 | 325 µS/cm |
| 9 Mar 2026, 09:03 | 297 | 297 µS/cm |
| 6 Feb 2026, 12:31 | 301 | 301 µS/cm |
| 2 Jan 2026, 10:23 | 347 | 347 µS/cm |
| 1 Dec 2025, 09:05 | 295 | 295 µS/cm |
| 3 Nov 2025, 12:28 | 317 | 317 µS/cm |
| 8 Oct 2025, 13:42 | 362 | 362 µS/cm |
| 3 Apr 2025, 09:51 | 372 | 372 µS/cm |
Everything measured here
29 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 29 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 13 | Apr 2025 – Sep 2026 | 95.7% 2 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 13 | Apr 2025 – Sep 2026 | 9.21 mg/l 2 Sep 2026 |
| Temperature of Water 0076 | River water | 13 | Apr 2025 – Sep 2026 | 17.1 °C 2 Sep 2026 |
| pH 0061 | River water | 26 | Oct 2023 – Sep 2026 | 7.48 2 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 12 | Oct 2025 – Sep 2026 | below 0.03 mg/l 2 Sep 2026 |
| Nitrate as N 0117 | River water | 12 | Oct 2025 – Sep 2026 | 21 mg/l 2 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 12 | Oct 2025 – Sep 2026 | 2.7 mg/l 2 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 13 | Apr 2025 – Sep 2026 | 531 µS/cm 2 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 12 | Oct 2025 – Sep 2026 | 76 mg/l 2 Sep 2026 |
| Aluminium, Dissolved 6037 | River water | 13 | Oct 2023 – Mar 2024 | 13 µg/l 25 Mar 2024 |
| Ammonia un-ionised as N 0119 | River water | 12 | Oct 2025 – Sep 2026 | below 0.00028 mg/l 2 Sep 2026 |
| Arsenic, Dissolved 6045 | River water | 13 | Oct 2023 – Mar 2024 | 12 µg/l 25 Mar 2024 |
| Cadmium, Dissolved 0106 | River water | 13 | Oct 2023 – Mar 2024 | 1.5 µg/l 25 Mar 2024 |
| Calcium, Dissolved 0239 | River water | 13 | Oct 2023 – Mar 2024 | 23 mg/l 25 Mar 2024 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 13 | Oct 2023 – Mar 2024 | 1 mg/l 25 Mar 2024 |
| Chromium, Dissolved 3409 | River water | 13 | Oct 2023 – Mar 2024 | below 0.5 µg/l 25 Mar 2024 |
| Copper : BLM Bioavailable 4821 | River water | 13 | Oct 2023 – Mar 2024 | 9.7 µg/l 25 Mar 2024 |
| Copper, Dissolved 6450 | River water | 13 | Oct 2023 – Mar 2024 | 35 µg/l 25 Mar 2024 |
| Lead : BLM Bioavailable 3377 | River water | 13 | Oct 2023 – Mar 2024 | 1 µg/l 25 Mar 2024 |
| Lead, Dissolved 0052 | River water | 13 | Oct 2023 – Mar 2024 | below 2 µg/l 25 Mar 2024 |
| Magnesium, Dissolved 0235 | River water | 13 | Oct 2023 – Mar 2024 | 6.3 mg/l 25 Mar 2024 |
| Manganese : BLM Bioavailable 4820 | River water | 13 | Oct 2023 – Mar 2024 | 2.1 µg/l 25 Mar 2024 |
| Manganese, Dissolved 6458 | River water | 13 | Oct 2023 – Mar 2024 | 15 µg/l 25 Mar 2024 |
| Nickel : BLM Bioavailable 3878 | River water | 13 | Oct 2023 – Mar 2024 | 5.1 µg/l 25 Mar 2024 |
| Nickel, Dissolved 3410 | River water | 13 | Oct 2023 – Mar 2024 | 11 µg/l 25 Mar 2024 |
| Nitrite as N 0118 | River water | 12 | Oct 2025 – Sep 2026 | below 0.004 mg/l 2 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 12 | Oct 2025 – Sep 2026 | 21 mg/l 2 Sep 2026 |
| Zinc : BLM Bioavailable 4822 | River water | 13 | Oct 2023 – Mar 2024 | 550 µg/l 25 Mar 2024 |
| Zinc, Dissolved 3408 | River water | 13 | Oct 2023 – Mar 2024 | 660 µg/l 25 Mar 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.