Severn at Castlefields

EA name: SEVERN AT CASTLEFIELDS (also listed as “RSN0966 SEVERN AT CASTLEFIELDS”)
Environment Agency sampling point MD-RSN0966 · 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
29 Dec 2023, 12:042.8 years ago · time as the Environment Agency records it (UK clock time; the source gives no time zone). Not sampled since, as far as the archive shows: the Environment Agency was asked up to 27 Oct 2026 and had nothing newer.
Samples banked
3 since 19 Oct 2023 Imported periods: 1 Oct 2023 – 27 Oct 2026. Samples outside them are not shown here.
Latest sample
River / running surface water Monitoring (national agency policy)
Where
National Grid 350316, 313236As published, to the nearest 1 m. Open in a map
River, by its own name
Severn
River, by the map
Afon HafrenPlaced on the river its name gives, 16 m from the line.
Next gauge downstream
Buildwas On the River Severn · 31 km along the river
Nearest gauge upstream
Welsh Bridge On the River Severn · 3.5 km along the riverHookagate On the Rea Brook · 10.0 km along the river
Why it was sampled
Monitoring (national agency policy) (3 samples)

1 visit found no water to sample (recorded as “No flow”).

Main measurements, river water

Dissolved oxygen

% saturation · code 9901 · %

93.2%

Sampled 1 Nov 2023, 3 years ago · 2 results banked

92.692.89393.2%202420252026no sample published after Nov 202319 Oct 2023, 09:28: 92.8%1 Nov 2023, 12:32: 93.2%
Every result (2)
SampledResult as publishedReads as
1 Nov 2023, 12:3293.2 93.2%
19 Oct 2023, 09:2892.8 92.8%

Dissolved oxygen

as O2 · code 9924 · mg/l

10.2 mg/l

Sampled 1 Nov 2023, 3 years ago · 2 results banked

89101112mg/l202420252026no sample published after Nov 202319 Oct 2023, 09:28: 10.2 mg/l1 Nov 2023, 12:32: 10.2 mg/l
Every result (2)
SampledResult as publishedReads as
1 Nov 2023, 12:3210.2 10.2 mg/l
19 Oct 2023, 09:2810.2 10.2 mg/l

Water temperature

code 0076 · °C

11.1 °C

Sampled 1 Nov 2023, 3 years ago · 2 results banked

910111213°C202420252026no sample published after Nov 202319 Oct 2023, 09:28: 11.1 °C1 Nov 2023, 12:32: 11.1 °C
Every result (2)
SampledResult as publishedReads as
1 Nov 2023, 12:3211.1 11.1 °C
19 Oct 2023, 09:2811.1 11.1 °C

pH

code 0061

7.82

Sampled 1 Nov 2023, 3 years ago · 2 results banked

7.827.837.847.85202420252026no sample published after Nov 202319 Oct 2023, 09:28: 7.851 Nov 2023, 12:32: 7.82
Every result (2)
SampledResult as publishedReads as
1 Nov 2023, 12:327.82 7.82
19 Oct 2023, 09:287.85 7.85

Ammonia

ammoniacal nitrogen as N · code 0111 · mg/l

0.065 mg/l

Sampled 1 Nov 2023, 3 years ago · 2 results banked

0.050.0550.060.065mg/l202420252026no sample published after Nov 202319 Oct 2023, 09:28: 0.051 mg/l1 Nov 2023, 12:32: 0.065 mg/l
Every result (2)
SampledResult as publishedReads as
1 Nov 2023, 12:320.065 0.065 mg/l
19 Oct 2023, 09:280.051 0.051 mg/l

Nitrate

as nitrogen (N) · code 0117 · mg/l

2.77 mg/l

Sampled 1 Nov 2023, 3 years ago · 2 results banked

2.72.82.933.1mg/l202420252026no sample published after Nov 202319 Oct 2023, 09:28: 3.08 mg/l1 Nov 2023, 12:32: 2.77 mg/l
Every result (2)
SampledResult as publishedReads as
1 Nov 2023, 12:322.77 2.77 mg/l
19 Oct 2023, 09:283.08 3.08 mg/l

Phosphate

orthophosphate, reactive, as P · code 0180 · mg/l

0.1 mg/l

Sampled 1 Nov 2023, 3 years ago · 2 results banked

0.10.120.140.16mg/l202420252026no sample published after Nov 202319 Oct 2023, 09:28: 0.14 mg/l1 Nov 2023, 12:32: 0.1 mg/l
Every result (2)
SampledResult as publishedReads as
1 Nov 2023, 12:320.1 0.1 mg/l
19 Oct 2023, 09:280.14 0.14 mg/l

Conductivity

at 25 °C · code 0077 · µS/cm

236 µS/cm

Sampled 1 Nov 2023, 3 years ago · 2 results banked

220225230235240µS/cm202420252026no sample published after Nov 202319 Oct 2023, 09:28: 223 µS/cm1 Nov 2023, 12:32: 236 µS/cm
Every result (2)
SampledResult as publishedReads as
1 Nov 2023, 12:32236 236 µS/cm
19 Oct 2023, 09:28223 223 µS/cm

Everything measured here

18 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 18 rows
DeterminandMaterialResults First – lastLatest result
Oxygen, Dissolved, % Saturation 9901 River water 2 Oct 2023 – Nov 2023 93.2% 1 Nov 2023
Oxygen, Dissolved as O2 9924 River water 2 Oct 2023 – Nov 2023 10.2 mg/l 1 Nov 2023
Temperature of Water 0076 River water 2 Oct 2023 – Nov 2023 11.1 °C 1 Nov 2023
pH 0061 River water 2 Oct 2023 – Nov 2023 7.82 1 Nov 2023
Ammoniacal Nitrogen as N 0111 River water 2 Oct 2023 – Nov 2023 0.065 mg/l 1 Nov 2023
Nitrate as N 0117 River water 2 Oct 2023 – Nov 2023 2.77 mg/l 1 Nov 2023
Orthophosphate, reactive as P 0180 River water 2 Oct 2023 – Nov 2023 0.1 mg/l 1 Nov 2023
Conductivity at 25 C 0077 River water 2 Oct 2023 – Nov 2023 236 µS/cm 1 Nov 2023
Alkalinity to pH 4.5 as CaCO3 0162 River water 2 Oct 2023 – Nov 2023 66 mg/l 1 Nov 2023
Ammonia un-ionised as N 0119 River water 2 Oct 2023 – Nov 2023 0.00085 mg/l 1 Nov 2023
Carbon, Organic, Dissolved as C :- {DOC} 0301 River water 2 Oct 2023 – Nov 2023 7.9 mg/l 1 Nov 2023
Chloride 0172 River water 2 Oct 2023 – Nov 2023 16 mg/l 1 Nov 2023
Nitrite as N 0118 River water 2 Oct 2023 – Nov 2023 0.026 mg/l 1 Nov 2023
Nitrogen, Total as N 9686 River water 2 Oct 2023 – Nov 2023 3.8 mg/l 1 Nov 2023
Nitrogen, Total Oxidised as N 0116 River water 2 Oct 2023 – Nov 2023 2.8 mg/l 1 Nov 2023
No flow /No sample 7668 River water 1 Dec 2023 – Dec 2023 Sample pnt inaccessible eg flooding etc 29 Dec 2023
Phosphorus, Total as P 0348 River water 2 Oct 2023 – Nov 2023 0.15 mg/l 1 Nov 2023
Silica, reactive as SiO2 0182 River water 2 Oct 2023 – Nov 2023 6.2 mg/l 1 Nov 2023

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.