River Barle at Tarr Steps

EA name: RIVER BARLE AT TARR STEPS
Environment Agency sampling point SW-70581085 · 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, 13:3917 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
Samples banked
6 since 27 Apr 2026 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
Latest sample
River / running surface water Monitoring (national agency policy) · results completed 1 Oct 2026
Where
National Grid 286774, 132118As published, to the nearest 1 m. Open in a map
River, by its own name
Barle
River, by the map
River BarlePlaced on the river its name gives, 6 m from the line.
Next gauge downstream
Brushford On the River Barle · 13 km along the river
Nearest gauge upstream
Simonsbath On the River Barle · 17 km along the river
Why it was sampled
Monitoring (national agency policy) (6 samples)

Results here were completed a median of 10 days after the sample was taken (9 to 21 days, 4 samples).

Main measurements, river water

Dissolved oxygen

% saturation · code 9901 · %

103.7%

Sampled 21 Sep 2026, 17 days ago · 6 results banked

100102104106%20242025202627 Apr 2026, 11:57: 105.8%14 May 2026, 14:58: 104.8%25 Jun 2026, 11:36: 100.1%15 Jul 2026, 16:08: 101%7 Aug 2026, 13:03: 104.7%21 Sep 2026, 13:39: 103.7%
Every result (6)
SampledResult as publishedReads as
21 Sep 2026, 13:39103.7 103.7%
7 Aug 2026, 13:03104.7 104.7%
15 Jul 2026, 16:08101 101%
25 Jun 2026, 11:36100.1 100.1%
14 May 2026, 14:58104.8 104.8%
27 Apr 2026, 11:57105.8 105.8%

Dissolved oxygen

as O2 · code 9924 · mg/l

10.9 mg/l

Sampled 21 Sep 2026, 17 days ago · 6 results banked

9101112mg/l20242025202627 Apr 2026, 11:57: 11.7 mg/l14 May 2026, 14:58: 11.1 mg/l25 Jun 2026, 11:36: 9.13 mg/l15 Jul 2026, 16:08: 9.09 mg/l7 Aug 2026, 13:03: 10.5 mg/l21 Sep 2026, 13:39: 10.9 mg/l
Every result (6)
SampledResult as publishedReads as
21 Sep 2026, 13:3910.9 10.9 mg/l
7 Aug 2026, 13:0310.5 10.5 mg/l
15 Jul 2026, 16:089.09 9.09 mg/l
25 Jun 2026, 11:369.13 9.13 mg/l
14 May 2026, 14:5811.1 11.1 mg/l
27 Apr 2026, 11:5711.7 11.7 mg/l

Water temperature

code 0076 · °C

13.1 °C

Sampled 21 Sep 2026, 17 days ago · 6 results banked

1012.51517.52022.5°C20242025202627 Apr 2026, 11:57: 10.9 °C14 May 2026, 14:58: 12.5 °C25 Jun 2026, 11:36: 19.7 °C15 Jul 2026, 16:08: 20.4 °C7 Aug 2026, 13:03: 15 °C21 Sep 2026, 13:39: 13.1 °C
Every result (6)
SampledResult as publishedReads as
21 Sep 2026, 13:3913.1 13.1 °C
7 Aug 2026, 13:0315 15 °C
15 Jul 2026, 16:0820.4 20.4 °C
25 Jun 2026, 11:3619.7 19.7 °C
14 May 2026, 14:5812.5 12.5 °C
27 Apr 2026, 11:5710.9 10.9 °C

pH

code 0061

7.57

Sampled 21 Sep 2026, 17 days ago · 6 results banked

7.57.67.77.87.920242025202627 Apr 2026, 11:57: 7.914 May 2026, 14:58: 7.8225 Jun 2026, 11:36: 7.6515 Jul 2026, 16:08: 7.97 Aug 2026, 13:03: 7.6221 Sep 2026, 13:39: 7.57
Every result (6)
SampledResult as publishedReads as
21 Sep 2026, 13:397.57 7.57
7 Aug 2026, 13:037.62 7.62
15 Jul 2026, 16:087.9 7.9
25 Jun 2026, 11:367.65 7.65
14 May 2026, 14:587.82 7.82
27 Apr 2026, 11:577.9 7.9

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 · 6 results banked

-0.500.51mg/l20242025202627 Apr 2026, 11:57: below 0.03 mg/l (not detected above this)14 May 2026, 14:58: below 0.03 mg/l (not detected above this)25 Jun 2026, 11:36: below 0.03 mg/l (not detected above this)15 Jul 2026, 16:08: below 0.03 mg/l (not detected above this)7 Aug 2026, 13:03: below 0.03 mg/l (not detected above this)21 Sep 2026, 13:39: below 0.03 mg/l (not detected above this)
Every result (6)
SampledResult as publishedReads as
21 Sep 2026, 13:39<0.03 below 0.03 mg/l (not detected above this)
7 Aug 2026, 13:03<0.03 below 0.03 mg/l (not detected above this)
15 Jul 2026, 16:08<0.03 below 0.03 mg/l (not detected above this)
25 Jun 2026, 11:36<0.03 below 0.03 mg/l (not detected above this)
14 May 2026, 14:58<0.03 below 0.03 mg/l (not detected above this)
27 Apr 2026, 11:57<0.03 below 0.03 mg/l (not detected above this)

Nitrate

as nitrogen (N) · code 0117 · mg/l

0.356 mg/l

Sampled 21 Sep 2026, 17 days ago · 6 results banked

0.250.30.350.40.450.5mg/l20242025202627 Apr 2026, 11:57: 0.346 mg/l14 May 2026, 14:58: 0.296 mg/l25 Jun 2026, 11:36: 0.486 mg/l15 Jul 2026, 16:08: 0.406 mg/l7 Aug 2026, 13:03: 0.286 mg/l21 Sep 2026, 13:39: 0.356 mg/l
Every result (6)
SampledResult as publishedReads as
21 Sep 2026, 13:390.356 0.356 mg/l
7 Aug 2026, 13:030.286 0.286 mg/l
15 Jul 2026, 16:080.406 0.406 mg/l
25 Jun 2026, 11:360.486 0.486 mg/l
14 May 2026, 14:580.296 0.296 mg/l
27 Apr 2026, 11:570.346 0.346 mg/l

Phosphate

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

below 0.01 mg/l (not detected above this)

Sampled 21 Sep 2026, 17 days ago · 6 results banked

-0.500.51mg/l20242025202627 Apr 2026, 11:57: below 0.01 mg/l (not detected above this)14 May 2026, 14:58: below 0.01 mg/l (not detected above this)25 Jun 2026, 11:36: below 0.01 mg/l (not detected above this)15 Jul 2026, 16:08: below 0.01 mg/l (not detected above this)7 Aug 2026, 13:03: below 0.01 mg/l (not detected above this)21 Sep 2026, 13:39: below 0.01 mg/l (not detected above this)
Every result (6)
SampledResult as publishedReads as
21 Sep 2026, 13:39<0.01 below 0.01 mg/l (not detected above this)
7 Aug 2026, 13:03<0.01 below 0.01 mg/l (not detected above this)
15 Jul 2026, 16:08<0.01 below 0.01 mg/l (not detected above this)
25 Jun 2026, 11:36<0.01 below 0.01 mg/l (not detected above this)
14 May 2026, 14:58<0.01 below 0.01 mg/l (not detected above this)
27 Apr 2026, 11:57<0.01 below 0.01 mg/l (not detected above this)

Conductivity

at 25 °C · code 0077 · µS/cm

70 µS/cm

Sampled 21 Sep 2026, 17 days ago · 6 results banked

70758085µS/cm20242025202627 Apr 2026, 11:57: 74 µS/cm14 May 2026, 14:58: 77 µS/cm25 Jun 2026, 11:36: 77 µS/cm15 Jul 2026, 16:08: 82 µS/cm7 Aug 2026, 13:03: 84 µS/cm21 Sep 2026, 13:39: 70 µS/cm
Every result (6)
SampledResult as publishedReads as
21 Sep 2026, 13:3970 70 µS/cm
7 Aug 2026, 13:0384 84 µS/cm
15 Jul 2026, 16:0882 82 µS/cm
25 Jun 2026, 11:3677 77 µS/cm
14 May 2026, 14:5877 77 µS/cm
27 Apr 2026, 11:5774 74 µS/cm

Everything measured here

14 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 14 rows
DeterminandMaterialResults First – lastLatest result
Oxygen, Dissolved, % Saturation 9901 River water 6 Apr 2026 – Sep 2026 103.7% 21 Sep 2026
Oxygen, Dissolved as O2 9924 River water 6 Apr 2026 – Sep 2026 10.9 mg/l 21 Sep 2026
Temperature of Water 0076 River water 6 Apr 2026 – Sep 2026 13.1 °C 21 Sep 2026
pH 0061 River water 6 Apr 2026 – Sep 2026 7.57 21 Sep 2026
Ammoniacal Nitrogen as N 0111 River water 6 Apr 2026 – Sep 2026 below 0.03 mg/l 21 Sep 2026
Nitrate as N 0117 River water 6 Apr 2026 – Sep 2026 0.356 mg/l 21 Sep 2026
Orthophosphate, reactive as P 0180 River water 6 Apr 2026 – Sep 2026 below 0.01 mg/l 21 Sep 2026
Conductivity at 25 C 0077 River water 6 Apr 2026 – Sep 2026 70 µS/cm 21 Sep 2026
Alkalinity to pH 4.5 as CaCO3 0162 River water 6 Apr 2026 – Sep 2026 11 mg/l 21 Sep 2026
Ammonia un-ionised as N 0119 River water 6 Apr 2026 – Sep 2026 below 0.00026 mg/l 21 Sep 2026
BOD : 5 Day ATU 0085 River water 6 Apr 2026 – Sep 2026 below 3 mg/l 21 Sep 2026
Carbon, Organic, Dissolved as C :- {DOC} 0301 River water 6 Apr 2026 – Sep 2026 2.1 mg/l 21 Sep 2026
Nitrite as N 0118 River water 6 Apr 2026 – Sep 2026 below 0.004 mg/l 21 Sep 2026
Nitrogen, Total Oxidised as N 0116 River water 6 Apr 2026 – Sep 2026 0.36 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.