Hartsbourne at Hartsbourne Stream Fsa
EA name: HARTSBOURNE AT HARTSBOURNE STREAM FSA (also listed as “RSN0146 HARTSBOURNE AT HARTSBOURNE STREAM FSA”)
Environment Agency sampling point TH-RSN0146 · 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
- 12 Dec 2023, 12:212.8 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 30 Sep 2026 and had nothing newer.
- Samples banked
- 3 since 10 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 512974, 193261As published, to the nearest 1 m. Open in a map
- River, by its own name
- Hartsbourne
- River, by the map
- HartsbournePlaced on the river its name gives, 1 m from the line.
- Next gauge downstream
- Moor Lane On the River Colne · 7.1 km along the river
- Why it was sampled
- Monitoring (national agency policy) (3 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
93.9%
Sampled 12 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Dec 2023, 12:21 | 93.9 | 93.9% |
| 9 Nov 2023, 10:12 | 95.9 | 95.9% |
| 10 Oct 2023, 12:01 | 58.7 | 58.7% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11 mg/l
Sampled 12 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Dec 2023, 12:21 | 11 | 11 mg/l |
| 9 Nov 2023, 10:12 | 11 | 11 mg/l |
| 10 Oct 2023, 12:01 | 5.98 | 5.98 mg/l |
Water temperature
code 0076 · °C
8.4 °C
Sampled 12 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Dec 2023, 12:21 | 8.4 | 8.4 °C |
| 9 Nov 2023, 10:12 | 9.3 | 9.3 °C |
| 10 Oct 2023, 12:01 | 14.4 | 14.4 °C |
pH
code 0061
7.74
Sampled 12 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Dec 2023, 12:21 | 7.74 | 7.74 |
| 9 Nov 2023, 10:12 | 7.85 | 7.85 |
| 10 Oct 2023, 12:01 | 7.69 | 7.69 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 12 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Dec 2023, 12:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Nov 2023, 10:12 | 0.031 | 0.031 mg/l |
| 10 Oct 2023, 12:01 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.796 mg/l
Sampled 12 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Dec 2023, 12:21 | 0.796 | 0.796 mg/l |
| 9 Nov 2023, 10:12 | 0.441 | 0.441 mg/l |
| 10 Oct 2023, 12:01 | 0.206 | 0.206 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.06 mg/l
Sampled 12 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Dec 2023, 12:21 | 0.06 | 0.06 mg/l |
| 9 Nov 2023, 10:12 | 0.062 | 0.062 mg/l |
| 10 Oct 2023, 12:01 | 0.16 | 0.16 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
315 µS/cm
Sampled 12 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Dec 2023, 12:21 | 315 | 315 µS/cm |
| 9 Nov 2023, 10:12 | 490 | 490 µS/cm |
| 10 Oct 2023, 12:01 | 843 | 843 µS/cm |
Everything measured here
60 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 60 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 3 | Oct 2023 – Dec 2023 | 93.9% 12 Dec 2023 |
| Oxygen, Dissolved as O2 9924 | River water | 3 | Oct 2023 – Dec 2023 | 11 mg/l 12 Dec 2023 |
| Temperature of Water 0076 | River water | 3 | Oct 2023 – Dec 2023 | 8.4 °C 12 Dec 2023 |
| pH 0061 | River water | 3 | Oct 2023 – Dec 2023 | 7.74 12 Dec 2023 |
| Ammoniacal Nitrogen as N 0111 | River water | 3 | Oct 2023 – Dec 2023 | below 0.03 mg/l 12 Dec 2023 |
| Nitrate as N 0117 | River water | 3 | Oct 2023 – Dec 2023 | 0.796 mg/l 12 Dec 2023 |
| Orthophosphate, reactive as P 0180 | River water | 3 | Oct 2023 – Dec 2023 | 0.06 mg/l 12 Dec 2023 |
| Conductivity at 25 C 0077 | River water | 3 | Oct 2023 – Dec 2023 | 315 µS/cm 12 Dec 2023 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 1 | Dec 2023 – Dec 2023 | below 0.001 µg/l 12 Dec 2023 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Dec 2023 – Dec 2023 | below 0.001 µg/l 12 Dec 2023 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 1 | Dec 2023 – Dec 2023 | below 0.001 µg/l 12 Dec 2023 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 1 | Dec 2023 – Dec 2023 | below 0.002 µg/l 12 Dec 2023 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 1 | Dec 2023 – Dec 2023 | below 0.0005 µg/l 12 Dec 2023 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 1 | Dec 2023 – Dec 2023 | below 0.001 µg/l 12 Dec 2023 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 1 | Dec 2023 – Dec 2023 | below 0.0005 µg/l 12 Dec 2023 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 1 | Dec 2023 – Dec 2023 | below 0.004 µg/l 12 Dec 2023 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Dec 2023 – Dec 2023 | below 0.005 µg/l 12 Dec 2023 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 1 | Dec 2023 – Dec 2023 | below 0.0005 µg/l 12 Dec 2023 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 1 | Dec 2023 – Dec 2023 | below 0.001 µg/l 12 Dec 2023 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 1 | Dec 2023 – Dec 2023 | below 0.001 µg/l 12 Dec 2023 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 1 | Dec 2023 – Dec 2023 | below 0.0005 µg/l 12 Dec 2023 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 3 | Oct 2023 – Dec 2023 | 82 mg/l 12 Dec 2023 |
| Ammonia un-ionised as N 0119 | River water | 3 | Oct 2023 – Dec 2023 | below 0.00027 mg/l 12 Dec 2023 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 3 | Oct 2023 – Dec 2023 | 17 mg/l 12 Dec 2023 |
| Chloride 0172 | River water | 3 | Oct 2023 – Dec 2023 | 18 mg/l 12 Dec 2023 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 1 | Dec 2023 – Dec 2023 | below 0.001 µg/l 12 Dec 2023 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 1 | Dec 2023 – Dec 2023 | below 0.002 µg/l 12 Dec 2023 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 1 | Dec 2023 – Dec 2023 | below 0.002 µg/l 12 Dec 2023 |
| Nitrite as N 0118 | River water | 3 | Oct 2023 – Dec 2023 | below 0.004 mg/l 12 Dec 2023 |
| Nitrogen, Total as N 9686 | River water | 3 | Oct 2023 – Dec 2023 | 2.2 mg/l 12 Dec 2023 |
| Nitrogen, Total Oxidised as N 0116 | River water | 3 | Oct 2023 – Dec 2023 | 0.8 mg/l 12 Dec 2023 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 1 | Dec 2023 – Dec 2023 | below 0.0005 µg/l 12 Dec 2023 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 1 | Dec 2023 – Dec 2023 | below 0.0005 µg/l 12 Dec 2023 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 1 | Dec 2023 – Dec 2023 | below 0.0005 µg/l 12 Dec 2023 |
| Perfluorobutanesulfonic acid 2972 | River water | 1 | Dec 2023 – Dec 2023 | 0.0042 µg/l 12 Dec 2023 |
| Perfluorobutanoic acid 2995 | River water | 1 | Dec 2023 – Dec 2023 | 0.0023 µg/l 12 Dec 2023 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 1 | Dec 2023 – Dec 2023 | 0.001 µg/l 12 Dec 2023 |
| Perfluorodecanesulfonic acid 2969 | River water | 1 | Dec 2023 – Dec 2023 | below 0.002 µg/l 12 Dec 2023 |
| Perfluorodecanoic acid 8892 | River water | 1 | Dec 2023 – Dec 2023 | below 0.002 µg/l 12 Dec 2023 |
| Perfluorododecane sulfonic acid 2968 | River water | 1 | Dec 2023 – Dec 2023 | below 0.005 µg/l 12 Dec 2023 |
| Perfluorododecanoic acid 8894 | River water | 1 | Dec 2023 – Dec 2023 | below 0.002 µg/l 12 Dec 2023 |
| Perfluoroheptanesulfonic acid 2967 | River water | 1 | Dec 2023 – Dec 2023 | below 0.0005 µg/l 12 Dec 2023 |
| Perfluoroheptanoic acid 8889 | River water | 1 | Dec 2023 – Dec 2023 | 0.001 µg/l 12 Dec 2023 |
| Perfluorohexanesulfonamide 2965 | River water | 1 | Dec 2023 – Dec 2023 | below 0.0005 µg/l 12 Dec 2023 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 1 | Dec 2023 – Dec 2023 | below 0.0005 µg/l 12 Dec 2023 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 1 | Dec 2023 – Dec 2023 | 0.0017 µg/l 12 Dec 2023 |
| Perfluorohexanoic acid 8888 | River water | 1 | Dec 2023 – Dec 2023 | 0.0017 µg/l 12 Dec 2023 |
| Perfluorononanesulfonic acid 2963 | River water | 1 | Dec 2023 – Dec 2023 | below 0.0005 µg/l 12 Dec 2023 |
| Perfluorononanoic acid 8891 | River water | 1 | Dec 2023 – Dec 2023 | below 0.001 µg/l 12 Dec 2023 |
| Perfluorooctadecanoic acid 2962 | River water | 1 | Dec 2023 – Dec 2023 | below 0.002 µg/l 12 Dec 2023 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | Dec 2023 – Dec 2023 | below 0.001 µg/l 12 Dec 2023 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 1 | Dec 2023 – Dec 2023 | 0.004 µg/l 12 Dec 2023 |
| Perfluorooctanoic acid 8890 | River water | 1 | Dec 2023 – Dec 2023 | 0.0028 µg/l 12 Dec 2023 |
| Perfluoropentanesulfonic acid 2957 | River water | 1 | Dec 2023 – Dec 2023 | below 0.0005 µg/l 12 Dec 2023 |
| Perfluorotetradecanoic acid 8895 | River water | 1 | Dec 2023 – Dec 2023 | below 0.006 µg/l 12 Dec 2023 |
| Perfluorotridecanoic acid 2955 | River water | 1 | Dec 2023 – Dec 2023 | below 0.005 µg/l 12 Dec 2023 |
| Perfluoroundecane sulfonic acid 2953 | River water | 1 | Dec 2023 – Dec 2023 | below 0.004 µg/l 12 Dec 2023 |
| Perfluoroundecanoic acid 8893 | River water | 1 | Dec 2023 – Dec 2023 | below 0.002 µg/l 12 Dec 2023 |
| Phosphorus, Total as P 0348 | River water | 3 | Oct 2023 – Dec 2023 | 0.17 mg/l 12 Dec 2023 |
| Silica, reactive as SiO2 0182 | River water | 3 | Oct 2023 – Dec 2023 | 9.9 mg/l 12 Dec 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.