Hullavington WwTW
Storm overflow run by Wessex Water, discharging into Gauze Brook.
"Not discharging" means the company's monitor reports no discharge right now — not that the water is clean. The feed publishes status only; no discharge volume is measured.
Year by year
The Environment Agency's official annual returns, counted the EA's way (12/24-hour spills). 2026 is our own running count, the same way, from the live feed: our own log of it begins on 28 February, and the discharges before that are Top of the Poops' record of the same feed. The official figure is published next spring.
A spill is the EA's 12/24-hour count: the first 12 hours of a discharge count as one, each further 24 hours with discharge as one more. "Monitor" is the share of that year the monitor was working, so a 0 beside a working monitor is a real zero; "no data" means the monitor produced no usable data that year — not zero. Years before 2024 are matched to this site by name and location, because the EA's site IDs changed that year; a monitor figure beside one of them means the outlet's permit confirms the match.
Twin outlet
Wessex Water runs another overflow within 300 m that also discharges into Gauze Brook. They share the sewer and the storm, so one outlet's figures are only part of what reaches the water.
This overflow (Hullavington Inlet): 0 spills in 2024. Distances are between the published outlet points. The names in brackets are Wessex Water's own, from its return.
Downstream of this overflow
The next gauge downstream that the river map places is Rodbourne (Gauze Brook), 5.8 km along the river.
Water-sampling points downstream
The nearest Environment Agency sampling points the river map places below Rodbourne. Points between this overflow and that gauge cannot be put in order with it on the map, so they are not listed.
- Gauze Brook at Rodbourne
5.9 km along the river, below Rodbourne · Last sampled 25 Jul 2019, before the imported period - Bristol Avon at St House, Little Somerford
9.4 km along the river, below Rodbourne · Last sampled 10 Dec 2024 · 22 months ago - Avon Somerford
11 km along the river, below Rodbourne · Last sampled 13 Aug 2026 · 2 months ago
A sample is dated: it is not the river now, and its results are on its own page. A sample taken after a discharge does not show that the discharge caused what was measured. Samples: Environment Agency Water Quality Archive, © Environment Agency and/or database right 2026, Open Government Licence v3.0.
A river gauge measures the level of the river; it does not measure this overflow's discharge, and a spill does not by itself explain a change there. Traced on OS Open Rivers (edition 2026-04), which leaves out many small channels.
Contains OS data © Crown copyright and database rights 2026.
What the 2024 return says
From Wessex Water's annual return to the Environment Agency for this overflow.
"High spill threshold not met" means this overflow did not spill often enough to trigger the EA's formal high-spill review for that year. It is not a statement that the spills were harmless.
Discharges we have recorded
No discharge has been recorded from the live feed for this overflow since we started following it. The official annual figure above is the record to rely on.
Rain nearby last 30 days
Nearest live rain gauge: Rainfall gauge nr Shipton Moyne, 5.8 km away. Brown shading = when this overflow was discharging; ▼ = a discharge start.
Overflow shading is a timing match, not proof of cause — heavy rain and spills share a trigger. Times come from the water company’s event-duration monitor (site status only; no discharge volume is published).
Where it is
Tell me when this overflow discharges
One message when the company's monitor reports a new discharge here. At most one every 6 hours.
Setting this alert needs JavaScript. The alerts you already have are on your alerts page.
The alert repeats the monitor's status: whether the overflow is discharging, not how much or why. It can only tell you about a discharge that starts after you turn it on.
Concerned about this overflow?
Report pollution you can see or smell to the regulator straight away; the company handles complaints about the overflow itself.
Live status: © Wessex Water storm overflow activity data, licensed under CC BY 4.0. Annual spill figures: Environment Agency Event Duration Monitoring return, © Environment Agency copyright and/or database right, Open Government Licence (OGL) v3.0. Discharges marked "via Top of the Poops", and this year's figures before 28 February, come from Top of the Poops' record of the same company feed, used under CC BY-SA 4.0: the feed's own start and end times as its pages print them, not their derived hours. Times are shown in UK local time. FloodRadar republishes the monitor's status and the EA's figures; it does not measure discharges itself. Constituency and council area from the EA's return: contains OS data © Crown copyright and database right 2026.