River Coln above sewage treatment works
EA name: RIVER COLN ABOVE STW (also listed as “RIVER COLN ABOVE STW NEAR WHELFORD”)
Environment Agency sampling point TH-PUTR0364 · 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
- 21 Sep 2026, 11:2217 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 12 since 1 Oct 2025 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Planned investigation (local monitoring) · results completed 30 Sep 2026
- Where
- National Grid 418854, 198381As published, to the nearest 1 m. Open in a map
- River, by its own name
- Coln
- River, by the map
- River ColnPlaced on the river its name gives, 2 m from the line.
- Next gauge downstream
- St Johns Lock On the River Thames · 4.8 km along the river
- Nearest gauge upstream
- Fairford On the River Coln · 6.0 km along the river
- Why it was sampled
- Planned investigation (local monitoring) (12 samples)
Results here were completed a median of 10 days after the sample was taken (9 to 11 days, 4 samples).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
96%
Sampled 21 Sep 2026, 17 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 11:22 | 96 | 96% |
| 10 Aug 2026, 11:28 | 98.2 | 98.2% |
| 22 Jul 2026, 14:59 | 111.1 | 111.1% |
| 10 Jun 2026, 12:53 | 107.4 | 107.4% |
| 21 May 2026, 11:30 | 96.6 | 96.6% |
| 8 Apr 2026, 13:16 | 105.2 | 105.2% |
| 24 Mar 2026, 11:56 | 101 | 101% |
| 11 Feb 2026, 11:14 | 97.3 | 97.3% |
| 8 Jan 2026, 11:48 | 98.4 | 98.4% |
| 4 Dec 2025, 10:57 | 95 | 95% |
| 19 Nov 2025, 11:30 | 94.1 | 94.1% |
| 1 Oct 2025, 12:47 | 99.7 | 99.7% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.1 mg/l
Sampled 21 Sep 2026, 17 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 11:22 | 10.1 | 10.1 mg/l |
| 10 Aug 2026, 11:28 | 9.55 | 9.55 mg/l |
| 22 Jul 2026, 14:59 | 10.7 | 10.7 mg/l |
| 10 Jun 2026, 12:53 | 11.3 | 11.3 mg/l |
| 21 May 2026, 11:30 | 10.1 | 10.1 mg/l |
| 8 Apr 2026, 13:16 | 11.3 | 11.3 mg/l |
| 24 Mar 2026, 11:56 | 11.3 | 11.3 mg/l |
| 11 Feb 2026, 11:14 | 11 | 11 mg/l |
| 8 Jan 2026, 11:48 | 11.9 | 11.9 mg/l |
| 4 Dec 2025, 10:57 | 11.1 | 11.1 mg/l |
| 19 Nov 2025, 11:30 | 11.2 | 11.2 mg/l |
| 1 Oct 2025, 12:47 | 10.8 | 10.8 mg/l |
Water temperature
code 0076 · °C
12.9 °C
Sampled 21 Sep 2026, 17 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 11:22 | 12.9 | 12.9 °C |
| 10 Aug 2026, 11:28 | 16.6 | 16.6 °C |
| 22 Jul 2026, 14:59 | 17.2 | 17.2 °C |
| 10 Jun 2026, 12:53 | 13.1 | 13.1 °C |
| 21 May 2026, 11:30 | 13.4 | 13.4 °C |
| 8 Apr 2026, 13:16 | 12.2 | 12.2 °C |
| 24 Mar 2026, 11:56 | 10.2 | 10.2 °C |
| 11 Feb 2026, 11:14 | 9.7 | 9.7 °C |
| 8 Jan 2026, 11:48 | 7.2 | 7.2 °C |
| 4 Dec 2025, 10:57 | 8.4 | 8.4 °C |
| 19 Nov 2025, 11:30 | 7.7 | 7.7 °C |
| 1 Oct 2025, 12:47 | 11.8 | 11.8 °C |
pH
code 0061
8.38
Sampled 21 Sep 2026, 17 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 11:22 | 8.38 | 8.38 |
| 10 Aug 2026, 11:28 | 8.21 | 8.21 |
| 22 Jul 2026, 14:59 | 8.33 | 8.33 |
| 10 Jun 2026, 12:53 | 8.28 | 8.28 |
| 21 May 2026, 11:30 | 8.12 | 8.12 |
| 8 Apr 2026, 13:16 | 8.12 | 8.12 |
| 24 Mar 2026, 11:56 | 8.4 | 8.4 |
| 11 Feb 2026, 11:14 | 8.05 | 8.05 |
| 8 Jan 2026, 11:48 | 8.1 | 8.1 |
| 4 Dec 2025, 10:57 | 8.06 | 8.06 |
| 19 Nov 2025, 11:30 | 8.12 | 8.12 |
| 1 Oct 2025, 12:47 | 8.24 | 8.24 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 21 Sep 2026, 17 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 11:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Aug 2026, 11:28 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Jul 2026, 14:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Jun 2026, 12:53 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 May 2026, 11:30 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Apr 2026, 13:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Mar 2026, 11:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Feb 2026, 11:14 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Jan 2026, 11:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Dec 2025, 10:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Nov 2025, 11:30 | 0.032 | 0.032 mg/l |
| 1 Oct 2025, 12:47 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
3.39 mg/l
Sampled 21 Sep 2026, 17 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 11:22 | 3.39 | 3.39 mg/l |
| 10 Aug 2026, 11:28 | 3.59 | 3.59 mg/l |
| 22 Jul 2026, 14:59 | 3.69 | 3.69 mg/l |
| 10 Jun 2026, 12:53 | 4.29 | 4.29 mg/l |
| 21 May 2026, 11:30 | 3.59 | 3.59 mg/l |
| 8 Apr 2026, 13:16 | 5.59 | 5.59 mg/l |
| 24 Mar 2026, 11:56 | 5.8 | 5.8 mg/l |
| 11 Feb 2026, 11:14 | 6.19 | 6.19 mg/l |
| 8 Jan 2026, 11:48 | 6.29 | 6.29 mg/l |
| 4 Dec 2025, 10:57 | 5.99 | 5.99 mg/l |
| 19 Nov 2025, 11:30 | 6.29 | 6.29 mg/l |
| 1 Oct 2025, 12:47 | 3.3 | 3.3 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.095 mg/l
Sampled 21 Sep 2026, 17 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 11:22 | 0.095 | 0.095 mg/l |
| 10 Aug 2026, 11:28 | 0.063 | 0.063 mg/l |
| 22 Jul 2026, 14:59 | 0.082 | 0.082 mg/l |
| 10 Jun 2026, 12:53 | 0.053 | 0.053 mg/l |
| 21 May 2026, 11:30 | 0.098 | 0.098 mg/l |
| 8 Apr 2026, 13:16 | 0.039 | 0.039 mg/l |
| 24 Mar 2026, 11:56 | 0.024 | 0.024 mg/l |
| 11 Feb 2026, 11:14 | 0.025 | 0.025 mg/l |
| 8 Jan 2026, 11:48 | 0.032 | 0.032 mg/l |
| 4 Dec 2025, 10:57 | 0.044 | 0.044 mg/l |
| 19 Nov 2025, 11:30 | 0.059 | 0.059 mg/l |
| 1 Oct 2025, 12:47 | 0.094 | 0.094 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
559 µS/cm
Sampled 21 Sep 2026, 17 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 11:22 | 559 | 559 µS/cm |
| 10 Aug 2026, 11:28 | 550 | 550 µS/cm |
| 22 Jul 2026, 14:59 | 543 | 543 µS/cm |
| 10 Jun 2026, 12:53 | 542 | 542 µS/cm |
| 21 May 2026, 11:30 | 530 | 530 µS/cm |
| 8 Apr 2026, 13:16 | 549 | 549 µS/cm |
| 24 Mar 2026, 11:56 | 546 | 546 µS/cm |
| 11 Feb 2026, 11:14 | 527 | 527 µS/cm |
| 8 Jan 2026, 11:48 | 553 | 553 µS/cm |
| 4 Dec 2025, 10:57 | 556 | 556 µS/cm |
| 19 Nov 2025, 11:30 | 565 | 565 µS/cm |
| 1 Oct 2025, 12:47 | 570 | 570 µS/cm |
Everything measured here
13 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 13 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 12 | Oct 2025 – Sep 2026 | 96% 21 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 12 | Oct 2025 – Sep 2026 | 10.1 mg/l 21 Sep 2026 |
| Temperature of Water 0076 | River water | 12 | Oct 2025 – Sep 2026 | 12.9 °C 21 Sep 2026 |
| pH 0061 | River water | 12 | Oct 2025 – Sep 2026 | 8.38 21 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 12 | Oct 2025 – Sep 2026 | below 0.03 mg/l 21 Sep 2026 |
| Nitrate as N 0117 | River water | 12 | Oct 2025 – Sep 2026 | 3.39 mg/l 21 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 12 | Oct 2025 – Sep 2026 | 0.095 mg/l 21 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 12 | Oct 2025 – Sep 2026 | 559 µS/cm 21 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 12 | Oct 2025 – Sep 2026 | 240 mg/l 21 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 12 | Oct 2025 – Sep 2026 | below 0.00068 mg/l 21 Sep 2026 |
| BOD : 5 Day ATU 0085 | River water | 12 | Oct 2025 – Sep 2026 | below 3 mg/l 21 Sep 2026 |
| Nitrite as N 0118 | River water | 12 | Oct 2025 – Sep 2026 | 0.0053 mg/l 21 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 12 | Oct 2025 – Sep 2026 | 3.4 mg/l 21 Sep 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.