Sewage data
Welcome to the Conham Bathing sewage data dashboard!
Here you can find both live and historical data on CSO (storm overflow) usage in the lower Bristol Avon.
The data comes directly from Wessex Water and covers the following four CSO locations: Hanham (the nearest CSO to the Conham bathing spot), two CSOs in Keynsham, and Saltford.
Please note this page works better in desktop version.
CSO map
The map shows the status of each of the CSO locations that we track.
If a green tick is shown our data indicates that this CSO hasn't discharged in the last 48 hours.
If a red exclamation mark is shown, our data indicates this CSO is either discharging now or has discharged in the last 48 hours. This means there could be sewage in this section of the watercourse.
Is there sewage in the river now?
This table shows the latest sewage spill date for each CSO location. Note that the “Date of last spill” is when the CSO stopped spilling, but it may have started on a previous date.
You can also see the number of hours since the CSO stopped spilling (in the third column). If it’s been 48 hours or less since the last spill, this will appear red, indicating that it is not recommended to swim there.
How much sewage has been spilled in the last month?
The chart above is a timeline summary of the past month’s spill activity across each of the CSO locations. CSO spills are shaded blue. Hover your mouse over these blue sections to view the spill duration in minutes.
This chart will only show if there have been spills recorded in the past month.
The table to the right shows the total spill durations (in minutes) for each CSO location over the past month.
Annual summary of all locations
The calendar above is a summary of combined CSO spill activity over the past year (data collection began in May 2022)
It shows spill durations, in minutes, of all 4 CSO locations combined. For example if we had 4 sites each spilling for 60 minutes in one day, it would show 240 minutes for that day. Each day is shaded blue, with the deepest blues indicating the days with the most spill activity. Hover your mouse over each day to see the combined spill activity for the day in minutes. Periods where data has not been collected are hatched.
The table below shows total spill durations (in minutes) per calendar month for each CSO location.
Please note: the 2022 annual summary is partial and only includes data from May 2022, when data collection began. The actual figure is likely to be significantly larger.