Ash Brook A602 Road Bridge Ashbrook
EA name: ASH BROOK A602 RD.BR.ASHBROOK
Environment Agency sampling point AN-13M10 · 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
- 3 Jul 2026, 12:163 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 14 since 4 Oct 2023 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 520200, 227700As published, to the nearest 100 m (so up to about 70 m out). Open in a map
- River, by its own name
- Ash Brook
- River, by the map
- Ash BrookPlaced on the river its name gives, 5 m from the line.
- Next gauge downstream
- Arlesey On the River Hiz · 13 km along the riverARLESEY GS 13 km along the river
- Why it was sampled
- Monitoring (national agency policy) (12 samples)
Environmental monitoring statutory (EU directives) (2 samples)
5 visits found no water to sample (recorded as “No flow”).
Everything measured here
65 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 65 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| (Perfluorohexanesulfonyl)[3-(trimethylazaniumyl)propyl]azanide 2890 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| 10:2 Fluorotelomer sulfonic acid 2994 | River water | 1 | Jan 2026 – Jan 2026 | below 0.002 µg/l 16 Jan 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 3 | Jun 2024 – Jan 2026 | below 0.001 µg/l 16 Jan 2026 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 2 | Jun 2024 – Jan 2026 | below 0.001 µg/l 16 Jan 2026 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 3 | Jun 2024 – Jan 2026 | below 0.001 µg/l 16 Jan 2026 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 3 | Jun 2024 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 3 | Jun 2024 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 2 | Jun 2025 – Jan 2026 | below 0.001 µg/l 16 Jan 2026 |
| 2H-Perfluoro-2-decenoic acid 2888 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 16 Jan 2026 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 2 | Jun 2025 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 3 | Jun 2024 – Jan 2026 | below 0.004 µg/l 16 Jan 2026 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 3 | Jun 2024 – Jan 2026 | below 0.001 µg/l 16 Jan 2026 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 2 | Jun 2025 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| 5:1:2 Fluorotelomer betaine 2887 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| 5:3 Fluorotelomer betaine 2886 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| 6:2 Fluorotelomer phosphate diester 2986 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 16 Jan 2026 |
| 6:2 Fluorotelomer sulfonamide amine oxide (6:2 FTNO) (Capstone A) 2841 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 16 Jan 2026 |
| 6:2 Fluorotelomer sulfonamide betaine 2985 | River water | 1 | Jan 2026 – Jan 2026 | 0.0013 µg/l 16 Jan 2026 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 3 | Jun 2024 – Jan 2026 | below 0.001 µg/l 16 Jan 2026 |
| 6:2/8:2 Fluorotelomer phosphate diester 2884 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 16 Jan 2026 |
| 6:6 Perfluorophosphinic acid 2883 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 16 Jan 2026 |
| 6:8 Perfluorophosphinic acid 2882 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 16 Jan 2026 |
| 8:2 Fluorotelomer phosphate diester 2880 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 16 Jan 2026 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 3 | Jun 2024 – Jan 2026 | below 0.001 µg/l 16 Jan 2026 |
| 8:8 Perfluorophosphinic acid 2879 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 16 Jan 2026 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 3 | Jun 2024 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 3 | Jun 2024 – Jan 2026 | below 0.001 µg/l 16 Jan 2026 |
| Hexafluoropropylene oxide trimer acid 2980 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 16 Jan 2026 |
| Iron, Dissolved 6460 | River water | 7 | Oct 2023 – Jul 2026 | 69 µg/l 3 Jul 2026 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 3 | Jun 2024 – Jan 2026 | below 0.002 µg/l 16 Jan 2026 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 3 | Jun 2024 – Jan 2026 | below 0.002 µg/l 16 Jan 2026 |
| No flow /No sample 7668 | River water | 5 | Apr 2024 – Jul 2025 | No flow/discharge at sampling point 25 Jul 2025 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 2 | Jun 2025 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 3 | Jun 2024 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 2 | Jun 2025 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 3 | Jun 2024 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 3 | Jun 2024 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| Perfluorobutanesulfonic acid 2972 | River water | 3 | Jun 2024 – Jan 2026 | 0.0015 µg/l 16 Jan 2026 |
| Perfluorobutanoic acid 2995 | River water | 3 | Jun 2024 – Jan 2026 | 0.0024 µg/l 16 Jan 2026 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 2 | Jun 2025 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| Perfluorodecanesulfonic acid 2969 | River water | 3 | Jun 2024 – Jan 2026 | below 0.001 µg/l 16 Jan 2026 |
| Perfluorodecanoic acid 8892 | River water | 3 | Jun 2024 – Jan 2026 | below 0.001 µg/l 16 Jan 2026 |
| Perfluorododecane sulfonic acid 2968 | River water | 3 | Jun 2024 – Jan 2026 | below 0.005 µg/l 16 Jan 2026 |
| Perfluorododecanoic acid 8894 | River water | 3 | Jun 2024 – Jan 2026 | below 0.002 µg/l 16 Jan 2026 |
| Perfluoroheptanesulfonic acid 2967 | River water | 3 | Jun 2024 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| Perfluoroheptanoic acid 8889 | River water | 3 | Jun 2024 – Jan 2026 | below 0.001 µg/l 16 Jan 2026 |
| Perfluorohexane sulfonamido amine 2874 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| Perfluorohexanesulfonamide 2965 | River water | 3 | Jun 2024 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 3 | Jun 2024 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 3 | Jun 2024 – Jan 2026 | 0.00094 µg/l 16 Jan 2026 |
| Perfluorohexanoic acid 8888 | River water | 2 | Jun 2025 – Jan 2026 | 0.0022 µg/l 16 Jan 2026 |
| Perfluorononanesulfonic acid 2963 | River water | 3 | Jun 2024 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| Perfluorononanoic acid 8891 | River water | 3 | Jun 2024 – Jan 2026 | below 0.001 µg/l 16 Jan 2026 |
| Perfluorooctadecanoic acid 2962 | River water | 3 | Jun 2024 – Jan 2026 | below 0.002 µg/l 16 Jan 2026 |
| Perfluorooctanesulfonamide 2961 | River water | 3 | Jun 2024 – Jan 2026 | below 0.001 µg/l 16 Jan 2026 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 3 | Jun 2024 – Jan 2026 | 0.0013 µg/l 16 Jan 2026 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 3 | Jun 2024 – Jan 2026 | 0.0016 µg/l 16 Jan 2026 |
| Perfluorooctanesulfonic acid (total) 2958 | River water | 1 | Jan 2026 – Jan 2026 | 0.0029 µg/l 16 Jan 2026 |
| Perfluorooctanoic acid 8890 | River water | 3 | Jun 2024 – Jan 2026 | 0.00094 µg/l 16 Jan 2026 |
| Perfluoropentanesulfonic acid 2957 | River water | 3 | Jun 2024 – Jan 2026 | below 0.0005 µg/l 16 Jan 2026 |
| Perfluoropentanoic acid 8887 | River water | 3 | Jun 2024 – Jan 2026 | 0.0022 µg/l 16 Jan 2026 |
| Perfluorotetradecanoic acid 8895 | River water | 3 | Jun 2024 – Jan 2026 | below 0.006 µg/l 16 Jan 2026 |
| Perfluorotridecanoic acid 2955 | River water | 3 | Jun 2024 – Jan 2026 | below 0.002 µg/l 16 Jan 2026 |
| Perfluoroundecane sulfonic acid 2953 | River water | 3 | Jun 2024 – Jan 2026 | below 0.004 µg/l 16 Jan 2026 |
| Perfluoroundecanoic acid 8893 | River water | 3 | Jun 2024 – Jan 2026 | below 0.001 µg/l 16 Jan 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.