Hampshire Avon upstream of Downton sewage treatment works

EA name: HAMPSHIRE AVON U/S DOWNTON STW (also listed as “HAMPSHIRE AVON UPSTREAM OF DOWNTON STW”)
Environment Agency sampling point SW-50260338 · 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: 15 Sep 2026, 10:5816 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
Samples banked: 41 since 1 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)
Where: National Grid 417536, 120789As published, to the nearest 1 m. Open in a map
River, by its own name: Hampshire Avon
River, by the map: River AvonPlaced on a river whose name partly matches its own, 8 m from the line.
Next gauge downstream: East Mills Flume On the River Avon · 11 km along the river
Nearest gauge upstream: Downton Iron Bridge On the River Avon · 1.1 km along the river
Why it was sampled: Planned investigation (local monitoring) (41 samples)

Main measurements, river water

E. coli

confirmed, membrane filtration · code 2348 · per 100 ml

360 per 100 ml

Sampled 15 Sep 2026, 16 days ago · 41 results banked

Every result (41)

Sampled	Result as published	Reads as
15 Sep 2026, 10:58	360	360 per 100 ml
8 Sep 2026, 11:15	1600	1600 per 100 ml
1 Sep 2026, 11:52	220	220 per 100 ml
27 Aug 2026, 11:05	200	200 per 100 ml
20 Aug 2026, 12:50	210	210 per 100 ml
14 Aug 2026, 10:50	200	200 per 100 ml
8 Aug 2026, 11:56	140	140 per 100 ml
27 Jul 2026, 11:54	200	200 per 100 ml
20 Jul 2026, 10:46	230	230 per 100 ml
13 Jul 2026, 11:24	140	140 per 100 ml
6 Jul 2026, 12:23	200	200 per 100 ml
30 Jun 2026, 11:23	270	270 per 100 ml
23 Jun 2026, 10:20	190	190 per 100 ml
18 Jun 2026, 11:39	340	340 per 100 ml
10 Jun 2026, 11:18	410	410 per 100 ml
5 Jun 2026, 11:47	330	330 per 100 ml
31 May 2026, 12:17	380	380 per 100 ml
26 May 2026, 11:37	400	400 per 100 ml
18 May 2026, 11:39	500	500 per 100 ml
22 Sep 2025, 14:25	650	650 per 100 ml
16 Sep 2025, 11:04	330	330 per 100 ml
7 Sep 2025, 10:04	300	300 per 100 ml
1 Sep 2025, 10:17	330	330 per 100 ml
26 Aug 2025, 11:49	290	290 per 100 ml
19 Aug 2025, 11:01	230	230 per 100 ml
13 Aug 2025, 10:53	220	220 per 100 ml
4 Aug 2025, 10:44	130	130 per 100 ml
24 Jul 2025, 10:03	190	190 per 100 ml
18 Jul 2025, 12:00	210	210 per 100 ml
7 Jul 2025, 11:22	820	820 per 100 ml
1 Jul 2025, 11:19	390	390 per 100 ml
26 Jun 2025, 14:50	540	540 per 100 ml
18 Jun 2025, 11:36	290	290 per 100 ml
12 Jun 2025, 10:42	440	440 per 100 ml
7 Jun 2025, 10:35	340	340 per 100 ml
2 Jun 2025, 10:41	420	420 per 100 ml
29 May 2025, 14:45	420	420 per 100 ml
28 May 2025, 10:36	5700	5700 per 100 ml
22 May 2025, 10:56	4700	4700 per 100 ml
16 May 2025, 10:52	530	530 per 100 ml
1 May 2025, 10:41	820	820 per 100 ml

Everything measured here

4 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 4 rows

Determinand	Material	Results	First – last	Latest result
Escherichia coli : Confirmed : MF 2348	River water	41	May 2025 – Sep 2026	360 per 100 ml 15 Sep 2026
Enterococci: Intestinal: Presumptive: MF 3722	River water	41	May 2025 – Sep 2026	160 colony forming units / 100ml 15 Sep 2026
MST Filtration 4926	River water	41	May 2025 – Sep 2026	DNA Stored 15 Sep 2026
Volume of Sample Filtered 4865	River water	41	May 2025 – Sep 2026	740 millilitre 15 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.