River Hems at Littlehempston
EA name: RIVER HEMS AT LITTLEHEMPSTON
Environment Agency sampling point SW-70721716 · 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
- 18 Sep 2026, 12:5913 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 41 since 2 May 2025 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Planned investigation (local monitoring) · results completed 22 Sep 2026
- Where
- National Grid 281257, 62569As published, to the nearest 1 m. Open in a map
- River, by its own name
- Hems
- River, by the map
- River HemsPlaced on the river its name gives, 1 m from the line. A tidal reach: water runs both ways, so no gauge order is claimed.
- Next gauge downstream
- Not known
- Why it was sampled
- Planned investigation (local monitoring) (35 samples)
Environmental monitoring statutory (EU directives) (6 samples)
Results here were completed a median of 4 days after the sample was taken (4 to 71 days, 25 samples).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
105%
Sampled 1 Sep 2026, 30 days ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Sep 2026, 13:39 | 105 | 105% |
| 21 Aug 2026, 13:50 | 100.9 | 100.9% |
| 5 Jul 2026, 11:21 | 105.8 | 105.8% |
| 11 Jun 2026, 10:08 | 93.9 | 93.9% |
| 7 May 2026, 11:39 | 94.3 | 94.3% |
| 23 Apr 2026, 13:24 | 106.5 | 106.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.4 mg/l
Sampled 1 Sep 2026, 30 days ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Sep 2026, 13:39 | 10.4 | 10.4 mg/l |
| 21 Aug 2026, 13:50 | 9.84 | 9.84 mg/l |
| 5 Jul 2026, 11:21 | 10.2 | 10.2 mg/l |
| 11 Jun 2026, 10:08 | 10.1 | 10.1 mg/l |
| 7 May 2026, 11:39 | 10.4 | 10.4 mg/l |
| 23 Apr 2026, 13:24 | 11.5 | 11.5 mg/l |
Water temperature
code 0076 · °C
15.5 °C
Sampled 1 Sep 2026, 30 days ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Sep 2026, 13:39 | 15.5 | 15.5 °C |
| 21 Aug 2026, 13:50 | 16.4 | 16.4 °C |
| 5 Jul 2026, 11:21 | 16.9 | 16.9 °C |
| 11 Jun 2026, 10:08 | 11.9 | 11.9 °C |
| 7 May 2026, 11:39 | 10.8 | 10.8 °C |
| 23 Apr 2026, 13:24 | 11.9 | 11.9 °C |
pH
code 0061
8.43
Sampled 1 Sep 2026, 30 days ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Sep 2026, 13:39 | 8.43 | 8.43 |
| 21 Aug 2026, 13:50 | 8.23 | 8.23 |
| 5 Jul 2026, 11:21 | 8.42 | 8.42 |
| 11 Jun 2026, 10:08 | 8.03 | 8.03 |
| 7 May 2026, 11:39 | 8.34 | 8.34 |
| 23 Apr 2026, 13:24 | 8.68 | 8.68 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 1 Sep 2026, 30 days ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Sep 2026, 13:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Aug 2026, 13:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Jul 2026, 11:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Jun 2026, 10:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 May 2026, 11:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Apr 2026, 13:24 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
4.29 mg/l
Sampled 1 Sep 2026, 30 days ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Sep 2026, 13:39 | 4.29 | 4.29 mg/l |
| 21 Aug 2026, 13:50 | 4.19 | 4.19 mg/l |
| 5 Jul 2026, 11:21 | 4.09 | 4.09 mg/l |
| 11 Jun 2026, 10:08 | 4.09 | 4.09 mg/l |
| 7 May 2026, 11:39 | 3.89 | 3.89 mg/l |
| 23 Apr 2026, 13:24 | 4.09 | 4.09 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.14 mg/l
Sampled 1 Sep 2026, 30 days ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Sep 2026, 13:39 | 0.14 | 0.14 mg/l |
| 21 Aug 2026, 13:50 | 0.16 | 0.16 mg/l |
| 5 Jul 2026, 11:21 | 0.11 | 0.11 mg/l |
| 11 Jun 2026, 10:08 | 0.1 | 0.1 mg/l |
| 7 May 2026, 11:39 | 0.094 | 0.094 mg/l |
| 23 Apr 2026, 13:24 | 0.068 | 0.068 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
540 µS/cm
Sampled 1 Sep 2026, 30 days ago · 6 results banked
Every result (6)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Sep 2026, 13:39 | 540 | 540 µS/cm |
| 21 Aug 2026, 13:50 | 551 | 551 µS/cm |
| 5 Jul 2026, 11:21 | 534 | 534 µS/cm |
| 11 Jun 2026, 10:08 | 505 | 505 µS/cm |
| 7 May 2026, 11:39 | 501 | 501 µS/cm |
| 23 Apr 2026, 13:24 | 495 | 495 µS/cm |
E. coli
confirmed, membrane filtration · code 2348 · per 100 ml
2900 per 100 ml
Sampled 18 Sep 2026, 13 days ago · 38 results banked
Every result (38)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Sep 2026, 12:59 | 2900 | 2900 per 100 ml |
| 7 Sep 2026, 11:29 | 1100 | 1100 per 100 ml |
| 1 Sep 2026, 13:39 | 1100 | 1100 per 100 ml |
| 21 Aug 2026, 13:50 | 610 | 610 per 100 ml |
| 17 Aug 2026, 11:30 | 1400 | 1400 per 100 ml |
| 7 Aug 2026, 13:19 | 1200 | 1200 per 100 ml |
| 3 Aug 2026, 10:40 | 4800 | 4800 per 100 ml |
| 21 Jul 2026, 11:40 | 1200 | 1200 per 100 ml |
| 18 Jul 2026, 12:05 | 1000 | 1000 per 100 ml |
| 10 Jul 2026, 13:12 | 1800 | 1800 per 100 ml |
| 5 Jul 2026, 11:21 | 1500 | 1500 per 100 ml |
| 26 Jun 2026, 12:40 | 2500 | 2500 per 100 ml |
| 23 Jun 2026, 11:20 | 1500 | 1500 per 100 ml |
| 19 Jun 2026, 10:35 | 1700 | 1700 per 100 ml |
| 11 Jun 2026, 10:08 | 1200 | 1200 per 100 ml |
| 8 Jun 2026, 15:25 | 910 | 910 per 100 ml |
| 4 Jun 2026, 15:17 | 2800 | 2800 per 100 ml |
| 26 May 2026, 15:11 | 2700 | 2700 per 100 ml |
| 22 May 2026, 12:14 | 1700 | 1700 per 100 ml |
| 24 Sep 2025, 12:59 | 660 | 660 per 100 ml |
| 15 Sep 2025, 11:11 | 7300 | 7300 per 100 ml |
| 10 Sep 2025, 13:22 | 19000 | 19000 per 100 ml |
| 1 Sep 2025, 15:25 | 2300 | 2300 per 100 ml |
| 26 Aug 2025, 13:46 | 1500 | 1500 per 100 ml |
| 18 Aug 2025, 13:00 | 1900 | 1900 per 100 ml |
| 11 Aug 2025, 15:39 | 2300 | 2300 per 100 ml |
| 5 Aug 2025, 12:49 | 2000 | 2000 per 100 ml |
| 15 Jul 2025, 14:41 | 1500 | 1500 per 100 ml |
| 10 Jul 2025, 11:17 | 1300 | 1300 per 100 ml |
| 3 Jul 2025, 13:14 | 1400 | 1400 per 100 ml |
| 30 Jun 2025, 11:46 | 2200 | 2200 per 100 ml |
| 26 Jun 2025, 11:00 | 2400 | 2400 per 100 ml |
| 15 Jun 2025, 15:32 | 1800 | 1800 per 100 ml |
| 5 Jun 2025, 10:56 | 2000 | 2000 per 100 ml |
| 2 Jun 2025, 10:41 | 2500 | 2500 per 100 ml |
| 29 May 2025, 14:17 | 450 | 450 per 100 ml |
| 19 May 2025, 14:46 | 790 | 790 per 100 ml |
| 2 May 2025, 14:14 | 270 | 270 per 100 ml |
Everything measured here
35 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 35 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 6 | Apr 2026 – Sep 2026 | 105% 1 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 6 | Apr 2026 – Sep 2026 | 10.4 mg/l 1 Sep 2026 |
| Temperature of Water 0076 | River water | 6 | Apr 2026 – Sep 2026 | 15.5 °C 1 Sep 2026 |
| pH 0061 | River water | 6 | Apr 2026 – Sep 2026 | 8.43 1 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 6 | Apr 2026 – Sep 2026 | below 0.03 mg/l 1 Sep 2026 |
| Nitrate as N 0117 | River water | 6 | Apr 2026 – Sep 2026 | 4.29 mg/l 1 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 6 | Apr 2026 – Sep 2026 | 0.14 mg/l 1 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 6 | Apr 2026 – Sep 2026 | 540 µS/cm 1 Sep 2026 |
| Escherichia coli : Confirmed : MF 2348 | River water | 38 | May 2025 – Sep 2026 | 2900 per 100 ml 18 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 6 | Apr 2026 – Sep 2026 | 220 mg/l 1 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 6 | Apr 2026 – Sep 2026 | below 0.00082 mg/l 1 Sep 2026 |
| Bacteroides HF183 primer 5886 | River water | 5 | Jun 2025 – Sep 2025 | Present / 100ml 15 Sep 2025 |
| Bacteroidetes Marker : All 4907 | River water | 5 | Jun 2025 – Sep 2025 | Present 15 Sep 2025 |
| Bacteroidetes Marker : Human copy number 3820 | River water | 5 | Jun 2025 – Sep 2025 | 4.7 log (10) gene copies / 100ml 15 Sep 2025 |
| Bacteroidetes Marker : Ruminant 4906 | River water | 5 | Jun 2025 – Sep 2025 | Present 15 Sep 2025 |
| Bacteroidetes Marker : Ruminant copy number 3819 | River water | 5 | Jun 2025 – Sep 2025 | 6.6 log (10) gene copies / 100ml 15 Sep 2025 |
| Bacteroidetes marker: All copy number 3818 | River water | 5 | Jun 2025 – Sep 2025 | 7.7 log (10) gene copies / 100ml 15 Sep 2025 |
| Catellicoccus Marker : Seabird 3120 | River water | 5 | Jun 2025 – Sep 2025 | Present 15 Sep 2025 |
| Catellicoccus Marker : Seabird Copy Number 3116 | River water | 5 | Jun 2025 – Sep 2025 | below 2 log (10) gene copies / 100ml 15 Sep 2025 |
| Enterococci: Intestinal: Presumptive: MF 3722 | River water | 38 | May 2025 – Sep 2026 | 1500 colony forming units / 100ml 18 Sep 2026 |
| Microbial Source Tracking 4876 | River water | 5 | Jun 2025 – Sep 2025 | 1 text result 15 Sep 2025 |
| Mitochondrial Marker : Avian 4871 | River water | 5 | Jun 2025 – Sep 2025 | Not found 15 Sep 2025 |
| Mitochondrial Marker : Avian copy number 3817 | River water | 5 | Jun 2025 – Sep 2025 | below 2 log (10) gene copies / 100ml 15 Sep 2025 |
| Mitochondrial Marker : Canine 4870 | River water | 5 | Jun 2025 – Sep 2025 | Present 15 Sep 2025 |
| Mitochondrial Marker : Cattle 4755 | River water | 5 | Jun 2025 – Sep 2025 | Present 15 Sep 2025 |
| Mitochondrial Marker : Cattle copy number 3789 | River water | 5 | Jun 2025 – Sep 2025 | 4.5 log (10) gene copies / 100ml 15 Sep 2025 |
| Mitochondrial Marker : Human 4869 | River water | 5 | Jun 2025 – Sep 2025 | Present 15 Sep 2025 |
| Mitochondrial Marker : Human copy number 3812 | River water | 5 | Jun 2025 – Sep 2025 | 3.5 log (10) gene copies / 100ml 15 Sep 2025 |
| Mitochrondrial Marker: Canine copy number 3816 | River water | 5 | Jun 2025 – Sep 2025 | 2.9 log (10) gene copies / 100ml 15 Sep 2025 |
| MST Filtration 4926 | River water | 38 | May 2025 – Sep 2026 | DNA Stored 18 Sep 2026 |
| Nitrite as N 0118 | River water | 6 | Apr 2026 – Sep 2026 | 0.0082 mg/l 1 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 6 | Apr 2026 – Sep 2026 | 4.3 mg/l 1 Sep 2026 |
| Preparation: DNA 5923 | River water | 5 | Jun 2025 – Sep 2025 | Done 15 Sep 2025 |
| Salinity : In Situ 7608 | River water | 38 | May 2025 – Sep 2026 | 0.27 parts per thousand 18 Sep 2026 |
| Volume of Sample Filtered 4865 | River water | 38 | May 2025 – Sep 2026 | 850 millilitre 18 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.