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

7580859095%2024202520269 Apr 2026, 11:59: 89.9%21 May 2026, 12:50: 93.1%4 Jun 2026, 11:41: 84.6%2 Jul 2026, 09:52: 77.9%10 Aug 2026, 09:33: 76%
Every result (5)
SampledResult as publishedReads as
10 Aug 2026, 09:3376 76%
2 Jul 2026, 09:5277.9 77.9%
4 Jun 2026, 11:4184.6 84.6%
21 May 2026, 12:5093.1 93.1%
9 Apr 2026, 11:5989.9 89.9%

Dissolved oxygen

as O2 · code 9924 · mg/l

7.13 mg/l

Sampled 10 Aug 2026, 52 days ago · 5 results banked

78910mg/l2024202520269 Apr 2026, 11:59: 9.41 mg/l21 May 2026, 12:50: 9.24 mg/l4 Jun 2026, 11:41: 8.38 mg/l2 Jul 2026, 09:52: 7.33 mg/l10 Aug 2026, 09:33: 7.13 mg/l
Every result (5)
SampledResult as publishedReads as
10 Aug 2026, 09:337.13 7.13 mg/l
2 Jul 2026, 09:527.33 7.33 mg/l
4 Jun 2026, 11:418.38 8.38 mg/l
21 May 2026, 12:509.24 9.24 mg/l
9 Apr 2026, 11:599.41 9.41 mg/l

Water temperature

code 0076 · °C

18.3 °C

Sampled 10 Aug 2026, 52 days ago · 5 results banked

1214161820°C2024202520269 Apr 2026, 11:59: 13.2 °C21 May 2026, 12:50: 15.6 °C4 Jun 2026, 11:41: 15.7 °C2 Jul 2026, 09:52: 18.2 °C10 Aug 2026, 09:33: 18.3 °C
Every result (5)
SampledResult as publishedReads as
10 Aug 2026, 09:3318.3 18.3 °C
2 Jul 2026, 09:5218.2 18.2 °C
4 Jun 2026, 11:4115.7 15.7 °C
21 May 2026, 12:5015.6 15.6 °C
9 Apr 2026, 11:5913.2 13.2 °C

pH

code 0061

7.73

Sampled 10 Aug 2026, 52 days ago · 32 results banked

7.57.7588.258.58.752024202520262 Oct 2023, 13:53: 8.036 Nov 2023, 09:26: 7.9414 Dec 2023, 13:50: 7.8112 Jan 2024, 09:11: 7.958 Feb 2024, 10:18: 8.018 Mar 2024, 13:30: 8.044 Apr 2024, 13:18: 7.898 May 2024, 09:42: 8.0519 Jun 2024, 09:06: 8.532 Jul 2024, 12:18: 8.129 Aug 2024, 12:40: 8.1513 Sep 2024, 10:48: 7.982 Dec 2024, 10:51: 7.85 Feb 2025, 11:10: 8.2716 Apr 2025, 11:33: 8.3928 May 2025, 09:25: 8.2827 Jun 2025, 10:24: 8.018 Jul 2025, 08:43: 8.0628 Jul 2025, 11:35: 7.9211 Aug 2025, 10:01: 7.9115 Sep 2025, 09:42: 7.830 Sep 2025, 11:44: 7.883 Oct 2025, 11:41: 8.0721 Nov 2025, 09:56: 7.9210 Dec 2025, 11:26: 7.6326 Jan 2026, 12:25: 7.723 Feb 2026, 09:52: 8.099 Apr 2026, 11:59: 8.2221 May 2026, 12:50: 7.994 Jun 2026, 11:41: 7.82 Jul 2026, 09:52: 7.8610 Aug 2026, 09:33: 7.73
Every result (32)
SampledResult as publishedReads as
10 Aug 2026, 09:337.73 7.73
2 Jul 2026, 09:527.86 7.86
4 Jun 2026, 11:417.8 7.8
21 May 2026, 12:507.99 7.99
9 Apr 2026, 11:598.22 8.22
23 Feb 2026, 09:528.09 8.09
26 Jan 2026, 12:257.7 7.7
10 Dec 2025, 11:267.63 7.63
21 Nov 2025, 09:567.92 7.92
3 Oct 2025, 11:418.07 8.07
30 Sep 2025, 11:447.88 7.88
15 Sep 2025, 09:427.8 7.8
11 Aug 2025, 10:017.91 7.91
28 Jul 2025, 11:357.92 7.92
8 Jul 2025, 08:438.06 8.06
27 Jun 2025, 10:248.01 8.01
28 May 2025, 09:258.28 8.28
16 Apr 2025, 11:338.39 8.39
5 Feb 2025, 11:108.27 8.27
2 Dec 2024, 10:517.8 7.8
13 Sep 2024, 10:487.98 7.98
9 Aug 2024, 12:408.15 8.15
2 Jul 2024, 12:188.12 8.12
19 Jun 2024, 09:068.53 8.53
8 May 2024, 09:428.05 8.05
4 Apr 2024, 13:187.89 7.89
8 Mar 2024, 13:308.04 8.04
8 Feb 2024, 10:188.01 8.01
12 Jan 2024, 09:117.95 7.95
14 Dec 2023, 13:507.81 7.81
6 Nov 2023, 09:267.94 7.94
2 Oct 2023, 13:538.03 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

00.050.10.150.2mg/l2024202520269 Apr 2026, 11:59: below 0.03 mg/l (not detected above this)21 May 2026, 12:50: below 0.03 mg/l (not detected above this)4 Jun 2026, 11:41: 0.17 mg/l2 Jul 2026, 09:52: below 0.03 mg/l (not detected above this)10 Aug 2026, 09:33: below 0.03 mg/l (not detected above this)
Every result (5)
SampledResult as publishedReads 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, 11:410.17 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

55.566.5mg/l2024202520269 Apr 2026, 11:59: 6.19 mg/l21 May 2026, 12:50: 5.78 mg/l4 Jun 2026, 11:41: 5.92 mg/l2 Jul 2026, 09:52: 5.59 mg/l10 Aug 2026, 09:33: 5.09 mg/l
Every result (5)
SampledResult as publishedReads as
10 Aug 2026, 09:335.09 5.09 mg/l
2 Jul 2026, 09:525.59 5.59 mg/l
4 Jun 2026, 11:415.92 5.92 mg/l
21 May 2026, 12:505.78 5.78 mg/l
9 Apr 2026, 11:596.19 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

0.050.10.150.20.25mg/l2024202520269 Apr 2026, 11:59: 0.094 mg/l21 May 2026, 12:50: 0.12 mg/l4 Jun 2026, 11:41: 0.23 mg/l2 Jul 2026, 09:52: 0.21 mg/l10 Aug 2026, 09:33: 0.14 mg/l
Every result (5)
SampledResult as publishedReads as
10 Aug 2026, 09:330.14 0.14 mg/l
2 Jul 2026, 09:520.21 0.21 mg/l
4 Jun 2026, 11:410.23 0.23 mg/l
21 May 2026, 12:500.12 0.12 mg/l
9 Apr 2026, 11:590.094 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

560580600620640µS/cm2024202520269 Apr 2026, 11:59: 598 µS/cm21 May 2026, 12:50: 591 µS/cm4 Jun 2026, 11:41: 567 µS/cm2 Jul 2026, 09:52: 630 µS/cm10 Aug 2026, 09:33: 613 µS/cm
Every result (5)
SampledResult as publishedReads as
10 Aug 2026, 09:33613 613 µS/cm
2 Jul 2026, 09:52630 630 µS/cm
4 Jun 2026, 11:41567 567 µS/cm
21 May 2026, 12:50591 591 µS/cm
9 Apr 2026, 11:59598 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
DeterminandMaterialResults First – lastLatest 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.