St Austell River at Iron Bridge
EA name: ST. AUSTELL RIVER AT IRON BRIDGE (also listed as “ST. AUSTELL RIVER AT IRON BRIDGE ABOVE ST AUSTELL(MENAGWINS) STW”)
Environment Agency sampling point SW-81810168 · 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
- 3 Sep 2026, 12:3828 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 31 since 11 Apr 2024 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 201202, 51115As published, to the nearest 1 m. Open in a map
- River, by its own name
- St Austell
- River, by the map
- Not placedIts name gives St Austell; the only line close by, 0 m away, is White River 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) (16 samples)
Environmental monitoring statutory (EU directives) (13 samples)
Unplanned reactive monitoring (pollution incidents) (2 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
102.5%
Sampled 3 Sep 2026, 28 days ago · 14 results banked
Every result (14)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 12:38 | 102.5 | 102.5% |
| 3 Aug 2026, 15:44 | 100 | 100% |
| 1 Jul 2026, 10:20 | 102 | 102% |
| 9 Jun 2026, 11:33 | 102.5 | 102.5% |
| 5 May 2026, 10:18 | 98.7 | 98.7% |
| 13 Apr 2026, 14:21 | 105.1 | 105.1% |
| 12 Mar 2026, 09:56 | 100.1 | 100.1% |
| 10 Feb 2026, 12:02 | 101.5 | 101.5% |
| 15 Jan 2026, 10:48 | 98.6 | 98.6% |
| 3 Dec 2025, 12:48 | 98.5 | 98.5% |
| 6 Nov 2025, 12:19 | 99.1 | 99.1% |
| 7 Oct 2025, 13:59 | 100.5 | 100.5% |
| 7 Apr 2025, 14:45 | 98.8 | 98.8% |
| 11 Apr 2024, 12:26 | 98.5 | 98.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.56 mg/l
Sampled 3 Sep 2026, 28 days ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 12:38 | 9.56 | 9.56 mg/l |
| 3 Aug 2026, 15:44 | 9.25 | 9.25 mg/l |
| 1 Jul 2026, 10:20 | 9.79 | 9.79 mg/l |
| 9 Jun 2026, 11:33 | 10.6 | 10.6 mg/l |
| 5 May 2026, 10:18 | 10.4 | 10.4 mg/l |
| 13 Apr 2026, 14:21 | 11.4 | 11.4 mg/l |
| 12 Mar 2026, 09:56 | 11.3 | 11.3 mg/l |
| 10 Feb 2026, 12:02 | 11.3 | 11.3 mg/l |
| 15 Jan 2026, 10:48 | 11.3 | 11.3 mg/l |
| 3 Dec 2025, 12:48 | 11.1 | 11.1 mg/l |
| 6 Nov 2025, 12:19 | 10.3 | 10.3 mg/l |
| 7 Oct 2025, 13:59 | 10.3 | 10.3 mg/l |
| 7 Apr 2025, 14:45 | 10.5 | 10.5 mg/l |
Water temperature
code 0076 · °C
18.6 °C
Sampled 3 Sep 2026, 28 days ago · 14 results banked
Every result (14)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 12:38 | 18.6 | 18.6 °C |
| 3 Aug 2026, 15:44 | 19 | 19 °C |
| 1 Jul 2026, 10:20 | 17.2 | 17.2 °C |
| 9 Jun 2026, 11:33 | 13.8 | 13.8 °C |
| 5 May 2026, 10:18 | 13 | 13 °C |
| 13 Apr 2026, 14:21 | 11.7 | 11.7 °C |
| 12 Mar 2026, 09:56 | 10 | 10 °C |
| 10 Feb 2026, 12:02 | 10.5 | 10.5 °C |
| 15 Jan 2026, 10:48 | 9.2 | 9.2 °C |
| 3 Dec 2025, 12:48 | 10.1 | 10.1 °C |
| 6 Nov 2025, 12:19 | 13.5 | 13.5 °C |
| 7 Oct 2025, 13:59 | 14.2 | 14.2 °C |
| 7 Apr 2025, 14:45 | 12.5 | 12.5 °C |
| 11 Apr 2024, 12:26 | 11.6 | 11.6 °C |
pH
code 0061
7.23
Sampled 3 Sep 2026, 28 days ago · 14 results banked
Every result (14)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 12:38 | 7.23 | 7.23 |
| 3 Aug 2026, 15:44 | 7.58 | 7.58 |
| 1 Jul 2026, 10:20 | 6.89 | 6.89 |
| 9 Jun 2026, 11:33 | 6.96 | 6.96 |
| 5 May 2026, 10:18 | 7.01 | 7.01 |
| 13 Apr 2026, 14:21 | 7.27 | 7.27 |
| 12 Mar 2026, 09:56 | 7.14 | 7.14 |
| 10 Feb 2026, 12:02 | 6.86 | 6.86 |
| 15 Jan 2026, 10:48 | 6.92 | 6.92 |
| 3 Dec 2025, 12:48 | 6.97 | 6.97 |
| 6 Nov 2025, 12:19 | 7.25 | 7.25 |
| 7 Oct 2025, 13:59 | 7.17 | 7.17 |
| 7 Apr 2025, 14:45 | 7.19 | 7.19 |
| 11 Apr 2024, 12:26 | 7.37 | 7.37 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 3 Sep 2026, 28 days ago · 14 results banked
Every result (14)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 12:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Aug 2026, 15:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Jul 2026, 10:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jun 2026, 11:33 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 May 2026, 10:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Apr 2026, 14:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Mar 2026, 09:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Feb 2026, 12:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jan 2026, 10:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Dec 2025, 12:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Nov 2025, 12:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Oct 2025, 13:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Apr 2025, 14:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Apr 2024, 12:26 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
1.2 mg/l
Sampled 3 Sep 2026, 28 days ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 12:38 | 1.2 | 1.2 mg/l |
| 3 Aug 2026, 15:44 | 1.2 | 1.2 mg/l |
| 1 Jul 2026, 10:20 | 1.2 | 1.2 mg/l |
| 9 Jun 2026, 11:33 | 1.2 | 1.2 mg/l |
| 5 May 2026, 10:18 | 1.3 | 1.3 mg/l |
| 13 Apr 2026, 14:21 | 1.3 | 1.3 mg/l |
| 12 Mar 2026, 09:56 | 1.6 | 1.6 mg/l |
| 10 Feb 2026, 12:02 | 1.7 | 1.7 mg/l |
| 15 Jan 2026, 10:48 | 1.7 | 1.7 mg/l |
| 3 Dec 2025, 12:48 | 2 | 2 mg/l |
| 6 Nov 2025, 12:19 | 1.7 | 1.7 mg/l |
| 7 Oct 2025, 13:59 | 1.3 | 1.3 mg/l |
| 7 Apr 2025, 14:45 | 1.5 | 1.5 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.024 mg/l
Sampled 3 Sep 2026, 28 days ago · 14 results banked
Every result (14)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 12:38 | 0.024 | 0.024 mg/l |
| 3 Aug 2026, 15:44 | 0.012 | 0.012 mg/l |
| 1 Jul 2026, 10:20 | 0.023 | 0.023 mg/l |
| 9 Jun 2026, 11:33 | 0.018 | 0.018 mg/l |
| 5 May 2026, 10:18 | <0.01 | below 0.01 mg/l (not detected above this) |
| 13 Apr 2026, 14:21 | 0.012 | 0.012 mg/l |
| 12 Mar 2026, 09:56 | 0.022 | 0.022 mg/l |
| 10 Feb 2026, 12:02 | 0.021 | 0.021 mg/l |
| 15 Jan 2026, 10:48 | 0.019 | 0.019 mg/l |
| 3 Dec 2025, 12:48 | 0.029 | 0.029 mg/l |
| 6 Nov 2025, 12:19 | 0.013 | 0.013 mg/l |
| 7 Oct 2025, 13:59 | 0.02 | 0.02 mg/l |
| 7 Apr 2025, 14:45 | <0.01 | below 0.01 mg/l (not detected above this) |
| 11 Apr 2024, 12:26 | 0.015 | 0.015 mg/l |
Turbidity
code 6396 · NTU
31 NTU
Sampled 11 Apr 2024, 2.5 years ago · 1 result banked
Every result (1)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Apr 2024, 12:26 | 31 | 31 NTU |
Conductivity
at 25 °C · code 0077 · µS/cm
158 µS/cm
Sampled 3 Sep 2026, 28 days ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Sep 2026, 12:38 | 158 | 158 µS/cm |
| 3 Aug 2026, 15:44 | 166 | 166 µS/cm |
| 1 Jul 2026, 10:20 | 124 | 124 µS/cm |
| 9 Jun 2026, 11:33 | 146 | 146 µS/cm |
| 5 May 2026, 10:18 | 154 | 154 µS/cm |
| 13 Apr 2026, 14:21 | 146 | 146 µS/cm |
| 12 Mar 2026, 09:56 | 149 | 149 µS/cm |
| 10 Feb 2026, 12:02 | 138 | 138 µS/cm |
| 15 Jan 2026, 10:48 | 150 | 150 µS/cm |
| 3 Dec 2025, 12:48 | 157 | 157 µS/cm |
| 6 Nov 2025, 12:19 | 155 | 155 µS/cm |
| 7 Oct 2025, 13:59 | 159 | 159 µS/cm |
| 7 Apr 2025, 14:45 | 156 | 156 µS/cm |
E. coli
confirmed, membrane filtration · code 2348 · per 100 ml
510 per 100 ml
Sampled 20 Sep 2024, 2 years ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 20 Sep 2024, 10:08 | 510 | 510 per 100 ml |
| 10 Sep 2024, 10:00 | 1100 | 1100 per 100 ml |
| 3 Sep 2024, 10:20 | 640 | 640 per 100 ml |
| 26 Aug 2024, 12:51 | 4300 | 4300 per 100 ml |
| 23 Aug 2024, 14:30 | 640 | 640 per 100 ml |
| 13 Aug 2024, 10:00 | 700 | 700 per 100 ml |
| 8 Aug 2024, 10:05 | 5800 | 5800 per 100 ml |
| 29 Jul 2024, 10:30 | 880 | 880 per 100 ml |
| 24 Jul 2024, 14:15 | 1000 | 1000 per 100 ml |
| 21 Jul 2024, 10:00 | 1500 | 1500 per 100 ml |
| 8 Jul 2024, 17:38 | 100000 | 100000 per 100 ml |
| 3 Jul 2024, 10:02 | 4400 | 4400 per 100 ml |
| 24 Jun 2024, 14:43 | 1800 | 1800 per 100 ml |
| 17 Jun 2024, 15:48 | 530 | 530 per 100 ml |
| 11 Jun 2024, 13:03 | 410 | 410 per 100 ml |
| 4 Jun 2024, 10:07 | 500 | 500 per 100 ml |
| 16 Apr 2024, 14:30 | 170 | 170 per 100 ml |
| 11 Apr 2024, 12:26 | 460 | 460 per 100 ml |
Everything measured here
23 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 23 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 14 | Apr 2024 – Sep 2026 | 102.5% 3 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 13 | Apr 2025 – Sep 2026 | 9.56 mg/l 3 Sep 2026 |
| Temperature of Water 0076 | River water | 14 | Apr 2024 – Sep 2026 | 18.6 °C 3 Sep 2026 |
| pH 0061 | River water | 14 | Apr 2024 – Sep 2026 | 7.23 3 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 14 | Apr 2024 – Sep 2026 | below 0.03 mg/l 3 Sep 2026 |
| Nitrate as N 0117 | River water | 13 | Apr 2025 – Sep 2026 | 1.2 mg/l 3 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 14 | Apr 2024 – Sep 2026 | 0.024 mg/l 3 Sep 2026 |
| Turbidity 6396 | River water | 1 | Apr 2024 – Apr 2024 | 31 NTU 11 Apr 2024 |
| Conductivity at 25 C 0077 | River water | 13 | Apr 2025 – Sep 2026 | 158 µS/cm 3 Sep 2026 |
| Escherichia coli : Confirmed : MF 2348 | River water | 18 | Apr 2024 – Sep 2024 | 510 per 100 ml 20 Sep 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 13 | Apr 2025 – Sep 2026 | 10 mg/l 3 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 14 | Apr 2024 – Sep 2026 | below 0.00018 mg/l 3 Sep 2026 |
| BOD : 5 Day ATU 0085 | River water | 1 | Apr 2024 – Apr 2024 | 1.1 mg/l 11 Apr 2024 |
| Chloride 0172 | River water | 1 | Apr 2024 – Apr 2024 | 21 mg/l 11 Apr 2024 |
| Enterococci: Intestinal: Confirmed: MF 3723 | River water | 1 | Apr 2024 – Apr 2024 | 18 colony forming units / 100ml 16 Apr 2024 |
| Enterococci: Intestinal: Presumptive: MF 3722 | River water | 17 | Apr 2024 – Sep 2024 | 370 colony forming units / 100ml 20 Sep 2024 |
| MST Filtration 4926 | River water | 18 | Apr 2024 – Sep 2024 | DNA Stored 20 Sep 2024 |
| National Grid Reference : Whole : Field report 7434 | River water | 1 | Apr 2024 – Apr 2024 | 1 unitless value 11 Apr 2024 |
| Nitrite as N 0118 | River water | 13 | Apr 2025 – Sep 2026 | below 0.004 mg/l 3 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 14 | Apr 2024 – Sep 2026 | 1.2 mg/l 3 Sep 2026 |
| Salinity : In Situ 7608 | River water | 1 | Apr 2024 – Apr 2024 | 0.07 parts per thousand 11 Apr 2024 |
| Solids, Suspended at 105 C 0135 | River water | 14 | Apr 2024 – Sep 2026 | 8.3 mg/l 3 Sep 2026 |
| Volume of Sample Filtered 4865 | River water | 18 | Apr 2024 – Sep 2024 | 780 millilitre 20 Sep 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.