River Stour at King's Mill
EA name: RIVER STOUR AT KING'S MILL
Environment Agency sampling point SW-50340488 · 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
- 10 Aug 2026, 09:3352 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 32 since 2 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 376616, 117109As published, to the nearest 1 m. Open in a map
- River, by its own name
- Stour
- River, by the map
- River StourPlaced on the river its name gives, 3 m from the line.
- Next gauge downstream
- Hammoon On the River Stour · 12 km along the river
- Nearest gauge upstream
- Wincanton On the River Cale · 19 km along the riverWINCANTON A303 19 km along the riverGillingham Le Neubourg Way On the River Stour · 22 km along the river
- Why it was sampled
- Monitoring (national agency policy) (21 samples)
Environmental monitoring statutory (EU directives) (11 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
76%
Sampled 10 Aug 2026, 52 days ago · 5 results banked
Every result (5)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 09:33 | 76 | 76% |
| 2 Jul 2026, 09:52 | 77.9 | 77.9% |
| 4 Jun 2026, 11:41 | 84.6 | 84.6% |
| 21 May 2026, 12:50 | 93.1 | 93.1% |
| 9 Apr 2026, 11:59 | 89.9 | 89.9% |
Dissolved oxygen
as O2 · code 9924 · mg/l
7.13 mg/l
Sampled 10 Aug 2026, 52 days ago · 5 results banked
Every result (5)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 09:33 | 7.13 | 7.13 mg/l |
| 2 Jul 2026, 09:52 | 7.33 | 7.33 mg/l |
| 4 Jun 2026, 11:41 | 8.38 | 8.38 mg/l |
| 21 May 2026, 12:50 | 9.24 | 9.24 mg/l |
| 9 Apr 2026, 11:59 | 9.41 | 9.41 mg/l |
Water temperature
code 0076 · °C
18.3 °C
Sampled 10 Aug 2026, 52 days ago · 5 results banked
Every result (5)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 09:33 | 18.3 | 18.3 °C |
| 2 Jul 2026, 09:52 | 18.2 | 18.2 °C |
| 4 Jun 2026, 11:41 | 15.7 | 15.7 °C |
| 21 May 2026, 12:50 | 15.6 | 15.6 °C |
| 9 Apr 2026, 11:59 | 13.2 | 13.2 °C |
pH
code 0061
7.73
Sampled 10 Aug 2026, 52 days ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 09:33 | 7.73 | 7.73 |
| 2 Jul 2026, 09:52 | 7.86 | 7.86 |
| 4 Jun 2026, 11:41 | 7.8 | 7.8 |
| 21 May 2026, 12:50 | 7.99 | 7.99 |
| 9 Apr 2026, 11:59 | 8.22 | 8.22 |
| 23 Feb 2026, 09:52 | 8.09 | 8.09 |
| 26 Jan 2026, 12:25 | 7.7 | 7.7 |
| 10 Dec 2025, 11:26 | 7.63 | 7.63 |
| 21 Nov 2025, 09:56 | 7.92 | 7.92 |
| 3 Oct 2025, 11:41 | 8.07 | 8.07 |
| 30 Sep 2025, 11:44 | 7.88 | 7.88 |
| 15 Sep 2025, 09:42 | 7.8 | 7.8 |
| 11 Aug 2025, 10:01 | 7.91 | 7.91 |
| 28 Jul 2025, 11:35 | 7.92 | 7.92 |
| 8 Jul 2025, 08:43 | 8.06 | 8.06 |
| 27 Jun 2025, 10:24 | 8.01 | 8.01 |
| 28 May 2025, 09:25 | 8.28 | 8.28 |
| 16 Apr 2025, 11:33 | 8.39 | 8.39 |
| 5 Feb 2025, 11:10 | 8.27 | 8.27 |
| 2 Dec 2024, 10:51 | 7.8 | 7.8 |
| 13 Sep 2024, 10:48 | 7.98 | 7.98 |
| 9 Aug 2024, 12:40 | 8.15 | 8.15 |
| 2 Jul 2024, 12:18 | 8.12 | 8.12 |
| 19 Jun 2024, 09:06 | 8.53 | 8.53 |
| 8 May 2024, 09:42 | 8.05 | 8.05 |
| 4 Apr 2024, 13:18 | 7.89 | 7.89 |
| 8 Mar 2024, 13:30 | 8.04 | 8.04 |
| 8 Feb 2024, 10:18 | 8.01 | 8.01 |
| 12 Jan 2024, 09:11 | 7.95 | 7.95 |
| 14 Dec 2023, 13:50 | 7.81 | 7.81 |
| 6 Nov 2023, 09:26 | 7.94 | 7.94 |
| 2 Oct 2023, 13:53 | 8.03 | 8.03 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 10 Aug 2026, 52 days ago · 5 results banked
Every result (5)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 09:33 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jul 2026, 09:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Jun 2026, 11:41 | 0.17 | 0.17 mg/l |
| 21 May 2026, 12:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Apr 2026, 11:59 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
5.09 mg/l
Sampled 10 Aug 2026, 52 days ago · 5 results banked
Every result (5)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 09:33 | 5.09 | 5.09 mg/l |
| 2 Jul 2026, 09:52 | 5.59 | 5.59 mg/l |
| 4 Jun 2026, 11:41 | 5.92 | 5.92 mg/l |
| 21 May 2026, 12:50 | 5.78 | 5.78 mg/l |
| 9 Apr 2026, 11:59 | 6.19 | 6.19 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.14 mg/l
Sampled 10 Aug 2026, 52 days ago · 5 results banked
Every result (5)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 09:33 | 0.14 | 0.14 mg/l |
| 2 Jul 2026, 09:52 | 0.21 | 0.21 mg/l |
| 4 Jun 2026, 11:41 | 0.23 | 0.23 mg/l |
| 21 May 2026, 12:50 | 0.12 | 0.12 mg/l |
| 9 Apr 2026, 11:59 | 0.094 | 0.094 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
613 µS/cm
Sampled 10 Aug 2026, 52 days ago · 5 results banked
Every result (5)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 09:33 | 613 | 613 µS/cm |
| 2 Jul 2026, 09:52 | 630 | 630 µS/cm |
| 4 Jun 2026, 11:41 | 567 | 567 µS/cm |
| 21 May 2026, 12:50 | 591 | 591 µS/cm |
| 9 Apr 2026, 11:59 | 598 | 598 µS/cm |
Everything measured here
27 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 27 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 5 | Apr 2026 – Aug 2026 | 76% 10 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 5 | Apr 2026 – Aug 2026 | 7.13 mg/l 10 Aug 2026 |
| Temperature of Water 0076 | River water | 5 | Apr 2026 – Aug 2026 | 18.3 °C 10 Aug 2026 |
| pH 0061 | River water | 32 | Oct 2023 – Aug 2026 | 7.73 10 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 5 | Apr 2026 – Aug 2026 | below 0.03 mg/l 10 Aug 2026 |
| Nitrate as N 0117 | River water | 5 | Apr 2026 – Aug 2026 | 5.09 mg/l 10 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 5 | Apr 2026 – Aug 2026 | 0.14 mg/l 10 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 5 | Apr 2026 – Aug 2026 | 613 µS/cm 10 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 5 | Apr 2026 – Aug 2026 | 210 mg/l 10 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 5 | Apr 2026 – Aug 2026 | below 0.00055 mg/l 10 Aug 2026 |
| Calcium 0241 | River water | 10 | Oct 2023 – Jul 2026 | 100 mg/l 2 Jul 2026 |
| Calcium, Dissolved 0239 | River water | 29 | Oct 2023 – Aug 2026 | 98 mg/l 10 Aug 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 29 | Oct 2023 – Aug 2026 | 2.9 mg/l 10 Aug 2026 |
| Chromium Hexavalent, Dissolved :- {Cr VI} 6619 | River water | 10 | Oct 2023 – Jul 2026 | 0.12 µg/l 2 Jul 2026 |
| Chromium, Dissolved 3409 | River water | 10 | Oct 2023 – Jul 2026 | 0.71 µg/l 2 Jul 2026 |
| Copper : BLM Bioavailable 4821 | River water | 10 | Oct 2023 – Jul 2026 | 0.3 µg/l 2 Jul 2026 |
| Copper, Dissolved 6450 | River water | 10 | Oct 2023 – Jul 2026 | 2.6 µg/l 2 Jul 2026 |
| Hardness, Total as CaCO3 0158 | River water | 10 | Oct 2023 – Jul 2026 | 264 mg/l 2 Jul 2026 |
| Lead : BLM Bioavailable 3377 | River water | 28 | Oct 2023 – Aug 2026 | 0.12 µg/l 10 Aug 2026 |
| Lead, Dissolved 0052 | River water | 29 | Oct 2023 – Aug 2026 | 0.36 µg/l 10 Aug 2026 |
| Magnesium 0237 | River water | 10 | Oct 2023 – Jul 2026 | 3.5 mg/l 2 Jul 2026 |
| Nickel : BLM Bioavailable 3878 | River water | 28 | Oct 2023 – Aug 2026 | 0.72 µg/l 10 Aug 2026 |
| Nickel, Dissolved 3410 | River water | 29 | Oct 2023 – Aug 2026 | 1.9 µg/l 10 Aug 2026 |
| Nitrite as N 0118 | River water | 5 | Apr 2026 – Aug 2026 | 0.0099 mg/l 10 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 5 | Apr 2026 – Aug 2026 | 5.1 mg/l 10 Aug 2026 |
| Zinc 6455 | River water | 10 | Oct 2023 – Jul 2026 | below 5 µg/l 2 Jul 2026 |
| Zinc, Dissolved 3408 | River water | 10 | Oct 2023 – Jul 2026 | 5.4 µg/l 2 Jul 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.