Receiving watercourse
River Colne (Hertfordshire)
2 monitored storm overflows on the River Colne (Hertfordshire) are listed in the National Storm Overflow Hub. Operated by Thames Water.
The data records River Colne in more than one place, so it is split across 3 pages. This page is River Colne (Hertfordshire); see also River Colne (West Yorkshire) and River Colne (Essex).
2
Storm overflows
0
Active right now
0
Monitors offline
6
Spill events · 12 months
19h
Recorded discharge · 12 months
0
Open discrepancies
Every monitored overflow· 2
Each links to its full record — spill history, nearby water-quality sampling, citizen reports, and pre-filled accountability letters.
Seen something?
Sewage debris, foam, dead fish — citizen sightings are cross-referenced against the official discharge data above and strengthen the public record.