| 28 Tythebarn St | River Darwen | Not Discharging | 13:04 Feb 20 | 01:37 Feb 24 |
| Anyon Street/Laurel Ave CSO | Culverted tributary of River Darwen (Union Street) | Not Discharging | 19:32 Feb 23 | 01:37 Feb 24 |
| Back Queens Park Rd | Culverted Tributary of River Blakewater | Not Discharging | 07:30 Dec 20 2024 | 01:37 Feb 24 |
| Balle Street Hilton Street CSO | Culverted section of River Darwen | Not Discharging | 19:48 Feb 23 | 01:37 Feb 24 |
| Balle Street Hilton Street CSO | A culverted section of the River Darwen via a surface water sewer | Not Discharging | 19:48 Feb 23 | 01:37 Feb 24 |
| Belgrave Road CSO | Tributary of the River Darwen | Not Discharging | 24:00 Jan 01 1970 | 01:37 Feb 24 |
| Bolton Road Combined Sewer Overflow | River Darwen | Not Discharging | 13:13 Feb 20 | 01:37 Feb 24 |
| Bolton Road CSO | Unnamed tributary of the River Darwen | Not Discharging | 24:00 Jan 01 1970 | 15:52 Dec 20 2024 |
| Bolton Road CSO | Culverted Tributary of the River Darwen | Not Discharging | 07:30 Feb 21 | 01:37 Feb 24 |
| Bolton Road/Astley Street CSO | Kebbs Brook via a culvert, a tributary of the River Darwen | Not Discharging | 13:07 Feb 20 | 01:37 Feb 24 |
| Church Street/Parliament Street CSO | Culverted section of River Darwen | Not Discharging | 09:18 Jan 27 | 01:37 Feb 24 |
| Clarence Street CSO | River Darwen | Not Discharging | 20:05 Feb 23 | 01:37 Feb 24 |
| Coal Pit Lane CSO | River Medlock (via surface water sewer) | Not Discharging | 11:04 Jan 20 | 01:37 Feb 24 |
| Cotton Hall Street CSO | Culverted tributary of River Darwen | Not Discharging | 12:34 Feb 20 | 01:37 Feb 24 |
| Cranberry Lane CSO | Unnamed tributary of the River Darwen | Not Discharging | 06:34 Jan 01 | 01:37 Feb 24 |
| Cumberland Street CSO | Queens Park Culvert (Tributary of River Blakewater) | Not Discharging | 13:15 Feb 20 | 01:37 Feb 24 |
| Dickens Street CSO | Queens Park Culvert (tributary of River Blakewater) | Not Discharging | 03:40 Jan 27 | 01:37 Feb 24 |
| Footpath Nr Cross St CSO | River Darwen | Not Discharging | 15:30 Feb 23 | 01:37 Feb 24 |
| Grimshaw Park CSO | Culverted section of an unnamed trib. of River Blakewater | Not Discharging | 24:00 Jan 01 1970 | 01:37 Feb 24 |
| Grimshaw Street CSO | River Darwen via SWS | Not Discharging | 13:21 Feb 20 | 01:37 Feb 24 |
| Higher Perry St/Black Laurel St CSO | Culverted tributary of River Darwen via surface water sewer | Not Discharging | 19:54 Feb 23 | 01:37 Feb 24 |
| Hindle Street CSO | River Darwen via surface water sewer | Not Discharging | 01:44 Jan 31 | 01:37 Feb 24 |
| Infirmary Street CSO 05050 | Leeds Liverpool Canal | Not Discharging | 02:24 Jan 01 | 01:37 Feb 24 |
| Kay Street CSO | Culverted tributary of the River Darwen | Not Discharging | 02:30 Jan 27 | 01:37 Feb 24 |
| Lower Audley CSO | Culverted tributary of River Blakewater | Not Discharging | 19:45 Feb 23 | 01:37 Feb 24 |
| Lower Eccleshill Road CSO | River Darwen | Not Discharging | 11:36 Jan 09 | 01:37 Feb 24 |
| Merchants Landing Culvert St CSO | River Blakewater via the Culvert street culvert | Not Discharging | 09:16 Feb 19 | 01:37 Feb 24 |
| Pringle Street CSO | Culverted tributary of River Blakewater | Not Discharging | 03:02 Dec 21 2024 | 01:37 Feb 24 |
| Queens Road (Darwen) CSO | Culverted tributary of the River Darwen | Not Discharging | 11:12 Feb 14 | 01:37 Feb 24 |
| Railway Road/South Street CSO | A culverted section of River Darwen | Not Discharging | 12:46 Jan 30 | 01:37 Feb 24 |
| Redearth Road/Sudell Road CSO | Culverted section of River Darwen | Not Discharging | 23:32 Dec 20 2024 | 01:37 Feb 24 |
| Sharples Street CSO | Culverted tributary of River Darwen | Not Discharging | 21:44 Feb 23 | 01:37 Feb 24 |
| Sudell Road CSO | Culverted tributary of River Darwen | Not Discharging | 13:18 Feb 20 | 01:37 Feb 24 |
| Sudellside Street | Culverted tributary of the River Darwen via a surface water sewer | Not Discharging | 24:00 Jan 01 1970 | 01:37 Feb 24 |
| Vale Street | Tributary of the River Darwen | Not Discharging | 04:40 Jan 01 | 01:37 Feb 24 |
| Waterside CSO 052z1 | Waterside Brook | Not Discharging | 04:30 Jan 27 | 01:37 Feb 24 |
| Wellington Road CSO | River Darwen | Not Discharging | 13:06 Feb 20 | 01:37 Feb 24 |
| Woodvale Flats CSO | Tributary of the River Darwen | Not Discharging | 06:06 Dec 21 2024 | 01:37 Feb 24 |
