Tetbury Avon at Slads Farm
EA name: TETBURY AVON AT SLADS FARM
Environment Agency sampling point SW-Z6540101 · 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
- 1 Jul 2026, 13:113 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 13 since 5 Oct 2023 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)
- Where
- National Grid 389707, 192002As published, to the nearest 1 m. Open in a map
- River, by its own name
- Tetbury Avon
- River, by the map
- River Avon (Tetbury Branch)Placed on a river whose name partly matches its own, 2 m from the line.
- Next gauge downstream
- Brokenborough On the Tetbury Avon · 5.9 km along the river
- Why it was sampled
- Monitoring (national agency policy) (10 samples)
Environmental monitoring statutory (EU directives) (3 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
92.1%
Sampled 16 Nov 2023, 2.9 years ago · 1 result banked
Every result (1)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Nov 2023, 08:32 | 92.1 | 92.1% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.4 mg/l
Sampled 16 Nov 2023, 2.9 years ago · 1 result banked
Every result (1)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Nov 2023, 08:32 | 10.4 | 10.4 mg/l |
Water temperature
code 0076 · °C
9.8 °C
Sampled 16 Nov 2023, 2.9 years ago · 1 result banked
Every result (1)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Nov 2023, 08:32 | 9.8 | 9.8 °C |
pH
code 0061
7.54
Sampled 1 Jul 2026, 3 months ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Jul 2026, 13:11 | 7.54 | 7.54 |
| 13 May 2026, 09:44 | 7.5 | 7.5 |
| 14 Jan 2026, 13:54 | 7.72 | 7.72 |
| 13 Oct 2025, 07:50 | 8.32 | 8.32 |
| 30 Jul 2025, 10:35 | 7.58 | 7.58 |
| 3 Apr 2025, 13:05 | 7.74 | 7.74 |
| 15 Jan 2025, 14:23 | 7.72 | 7.72 |
| 4 Oct 2024, 15:34 | 7.67 | 7.67 |
| 2 Aug 2024, 14:45 | 7.42 | 7.42 |
| 11 Apr 2024, 09:15 | 7.74 | 7.74 |
| 2 Jan 2024, 12:52 | 7.83 | 7.83 |
| 16 Nov 2023, 08:32 | 7.6 | 7.6 |
| 5 Oct 2023, 09:24 | 7.57 | 7.57 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.073 mg/l
Sampled 16 Nov 2023, 2.9 years ago · 1 result banked
Every result (1)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Nov 2023, 08:32 | 0.073 | 0.073 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
7.29 mg/l
Sampled 16 Nov 2023, 2.9 years ago · 1 result banked
Every result (1)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Nov 2023, 08:32 | 7.29 | 7.29 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.047 mg/l
Sampled 16 Nov 2023, 2.9 years ago · 1 result banked
Every result (1)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Nov 2023, 08:32 | 0.047 | 0.047 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
585 µS/cm
Sampled 16 Nov 2023, 2.9 years ago · 1 result banked
Every result (1)
| Sampled | Result as published | Reads as |
|---|---|---|
| 16 Nov 2023, 08:32 | 585 | 585 µS/cm |
Everything measured here
63 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 63 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 1 | Nov 2023 – Nov 2023 | 92.1% 16 Nov 2023 |
| Oxygen, Dissolved as O2 9924 | River water | 1 | Nov 2023 – Nov 2023 | 10.4 mg/l 16 Nov 2023 |
| Temperature of Water 0076 | River water | 1 | Nov 2023 – Nov 2023 | 9.8 °C 16 Nov 2023 |
| pH 0061 | River water | 13 | Oct 2023 – Jul 2026 | 7.54 1 Jul 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 1 | Nov 2023 – Nov 2023 | 0.073 mg/l 16 Nov 2023 |
| Nitrate as N 0117 | River water | 1 | Nov 2023 – Nov 2023 | 7.29 mg/l 16 Nov 2023 |
| Orthophosphate, reactive as P 0180 | River water | 1 | Nov 2023 – Nov 2023 | 0.047 mg/l 16 Nov 2023 |
| Conductivity at 25 C 0077 | River water | 1 | Nov 2023 – Nov 2023 | 585 µS/cm 16 Nov 2023 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 2 Aug 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 2 Aug 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 2 Aug 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 1 | Aug 2024 – Aug 2024 | below 0.002 µg/l 2 Aug 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 2 Aug 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 2 Aug 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 2 Aug 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 1 | Aug 2024 – Aug 2024 | below 0.004 µg/l 2 Aug 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Aug 2024 – Aug 2024 | below 0.005 µg/l 2 Aug 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 2 Aug 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 1 | Aug 2024 – Aug 2024 | 0.019 µg/l 2 Aug 2024 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 2 Aug 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 2 Aug 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 1 | Nov 2023 – Nov 2023 | 260 mg/l 16 Nov 2023 |
| Ammonia un-ionised as N 0119 | River water | 1 | Nov 2023 – Nov 2023 | 0.00053 mg/l 16 Nov 2023 |
| Calcium, Dissolved 0239 | River water | 12 | Oct 2023 – Jul 2026 | 100 mg/l 1 Jul 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 11 | Oct 2023 – Jul 2026 | 2.8 mg/l 1 Jul 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 2 Aug 2024 |
| Iron, Dissolved 6460 | River water | 12 | Oct 2023 – Jul 2026 | 54 µg/l 1 Jul 2026 |
| Magnesium, Dissolved 0235 | River water | 12 | Oct 2023 – Jul 2026 | 8.3 mg/l 1 Jul 2026 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 1 | Aug 2024 – Aug 2024 | below 0.002 µg/l 2 Aug 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 1 | Aug 2024 – Aug 2024 | below 0.002 µg/l 2 Aug 2024 |
| Nitrite as N 0118 | River water | 1 | Nov 2023 – Nov 2023 | 0.014 mg/l 16 Nov 2023 |
| Nitrogen, Total Oxidised as N 0116 | River water | 1 | Nov 2023 – Nov 2023 | 7.3 mg/l 16 Nov 2023 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 2 Aug 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 2 Aug 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 2 Aug 2024 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 2 Aug 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 2 Aug 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 1 | Aug 2024 – Aug 2024 | 0.002 µg/l 2 Aug 2024 |
| Perfluorobutanoic acid 2995 | River water | 1 | Aug 2024 – Aug 2024 | 0.0017 µg/l 2 Aug 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 1 | Aug 2024 – Aug 2024 | 0.0012 µg/l 2 Aug 2024 |
| Perfluorodecanesulfonic acid 2969 | River water | 1 | Aug 2024 – Aug 2024 | below 0.002 µg/l 2 Aug 2024 |
| Perfluorodecanoic acid 8892 | River water | 1 | Aug 2024 – Aug 2024 | below 0.002 µg/l 2 Aug 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 1 | Aug 2024 – Aug 2024 | below 0.005 µg/l 2 Aug 2024 |
| Perfluorododecanoic acid 8894 | River water | 1 | Aug 2024 – Aug 2024 | below 0.002 µg/l 2 Aug 2024 |
| Perfluoroheptanesulfonic acid 2967 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 2 Aug 2024 |
| Perfluoroheptanoic acid 8889 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 2 Aug 2024 |
| Perfluorohexanesulfonamide 2965 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 2 Aug 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 2 Aug 2024 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 2 Aug 2024 |
| Perfluorohexanoic acid 8888 | River water | 1 | Aug 2024 – Aug 2024 | 0.00079 µg/l 2 Aug 2024 |
| Perfluorononanesulfonic acid 2963 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 2 Aug 2024 |
| Perfluorononanoic acid 8891 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 2 Aug 2024 |
| Perfluorooctadecanoic acid 2962 | River water | 1 | Aug 2024 – Aug 2024 | below 0.002 µg/l 2 Aug 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 2 Aug 2024 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 2 Aug 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 1 | Aug 2024 – Aug 2024 | 0.00079 µg/l 2 Aug 2024 |
| Perfluorooctanoic acid 8890 | River water | 1 | Aug 2024 – Aug 2024 | 0.001 µg/l 2 Aug 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 2 Aug 2024 |
| Perfluoropentanoic acid 8887 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 2 Aug 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 1 | Aug 2024 – Aug 2024 | below 0.006 µg/l 2 Aug 2024 |
| Perfluorotridecanoic acid 2955 | River water | 1 | Aug 2024 – Aug 2024 | below 0.005 µg/l 2 Aug 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 1 | Aug 2024 – Aug 2024 | below 0.004 µg/l 2 Aug 2024 |
| Perfluoroundecanoic acid 8893 | River water | 1 | Aug 2024 – Aug 2024 | below 0.002 µg/l 2 Aug 2024 |
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.