| 28 Tythebarn St | River Darwen | Not Discharging | 05:03 Jan 01 | 23:52 Jan 18 |
| Anyon Street/Laurel Ave CSO | Culverted tributary of River Darwen (Union Street) | Not Discharging | 21:16 Jan 05 | 23:52 Jan 18 |
| Aqueduct Road CSO | River Darwen | Not Discharging | 16:44 Jan 14 | 23:52 Jan 18 |
| Back Queens Park Rd | Culverted Tributary of River Blakewater | Not Discharging | 07:30 Dec 20 2024 | 23:52 Jan 18 |
| Balle Street Hilton Street CSO | Culverted section of River Darwen | Not Discharging | 11:10 Jan 18 | 23:52 Jan 18 |
| Balle Street Hilton Street CSO | A culverted section of the River Darwen via a surface water sewer | Not Discharging | 21:26 Jan 05 | 23:52 Jan 18 |
| Belgrave Road CSO | Tributary of the River Darwen | Not Discharging | 24:00 Jan 01 1970 | 23:52 Jan 18 |
| Bolton Road Combined Sewer Overflow | River Darwen | Not Discharging | 21:40 Jan 05 | 23:52 Jan 18 |
| 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 | 15:54 Jan 07 | 23:52 Jan 18 |
| Bolton Road/Astley Street CSO | Kebbs Brook via a culvert, a tributary of the River Darwen | Not Discharging | 02:09 Jan 01 | 23:52 Jan 18 |
| Church Street/Parliament Street CSO | Culverted section of River Darwen | Not Discharging | 18:58 Dec 31 2024 | 23:52 Jan 18 |
| Clarence Street CSO | River Darwen | Not Discharging | 22:26 Jan 05 | 23:52 Jan 18 |
| Coal Pit Lane CSO | River Medlock (via surface water sewer) | Not Discharging | 22:00 Jan 18 | 23:52 Jan 18 |
| Cotton Hall Street CSO | Culverted tributary of River Darwen | Not Discharging | 11:32 Jan 01 | 23:52 Jan 18 |
| Cranberry Lane CSO | Unnamed tributary of the River Darwen | Not Discharging | 06:34 Jan 01 | 23:52 Jan 18 |
| Cumberland Street CSO | Queens Park Culvert (Tributary of River Blakewater) | Not Discharging | 21:26 Jan 05 | 23:52 Jan 18 |
| Dickens Street CSO | Queens Park Culvert (tributary of River Blakewater) | Not Discharging | 11:30 Jan 06 | 23:52 Jan 18 |
| Footpath Nr Cross St CSO | River Darwen | Not Discharging | 23:00 Jan 18 | 23:52 Jan 18 |
| Grimshaw Park CSO | Culverted section of an unnamed trib. of River Blakewater | Not Discharging | 24:00 Jan 01 1970 | 23:52 Jan 18 |
| Grimshaw Street CSO | River Darwen via SWS | Not Discharging | 06:48 Jan 01 | 23:52 Jan 18 |
| Higher Perry St/Black Laurel St CSO | Culverted tributary of River Darwen via surface water sewer | Not Discharging | 24:30 Jan 06 | 23:52 Jan 18 |
| Hindle Street CSO | River Darwen via surface water sewer | Not Discharging | 21:06 Jan 05 | 23:52 Jan 18 |
| Infirmary Street CSO 05050 | Leeds Liverpool Canal | Not Discharging | 02:24 Jan 01 | 23:52 Jan 18 |
| Kay Street CSO | Culverted tributary of the River Darwen | Not Discharging | 03:24 Jan 01 | 23:52 Jan 18 |
| Lower Audley CSO | Culverted tributary of River Blakewater | Not Discharging | 21:26 Jan 06 | 23:52 Jan 18 |
| Lower Eccleshill Road CSO | River Darwen | Not Discharging | 11:36 Jan 09 | 23:52 Jan 18 |
| Merchants Landing Culvert St CSO | River Blakewater via the Culvert street culvert | Not Discharging | 14:48 Jan 05 | 23:52 Jan 18 |
| Pringle Street CSO | Culverted tributary of River Blakewater | Not Discharging | 03:02 Dec 21 2024 | 23:52 Jan 18 |
| Queens Road (Darwen) CSO | Culverted tributary of the River Darwen | Not Discharging | 13:06 Nov 25 2024 | 23:52 Jan 18 |
| Railway Road/South Street CSO | A culverted section of River Darwen | Not Discharging | 24:00 Jan 01 1970 | 23:52 Jan 18 |
| Redearth Road/Sudell Road CSO | Culverted section of River Darwen | Not Discharging | 23:32 Dec 20 2024 | 23:52 Jan 18 |
| Sharples Street CSO | Culverted tributary of River Darwen | Not Discharging | 24:08 Jan 17 | 23:52 Jan 18 |
| Sudell Road CSO | Culverted tributary of River Darwen | Not Discharging | 07:22 Jan 01 | 23:52 Jan 18 |
| Sudellside Street | Culverted tributary of the River Darwen via a surface water sewer | Not Discharging | 24:00 Jan 01 1970 | 23:52 Jan 18 |
| Vale Street | Tributary of the River Darwen | Not Discharging | 04:40 Jan 01 | 23:52 Jan 18 |
| Waterside CSO 052z1 | Waterside Brook | Not Discharging | 24:46 Jan 06 | 23:52 Jan 18 |
| Wellington Road CSO | River Darwen | Not Discharging | 19:38 Dec 31 2024 | 23:52 Jan 18 |
| Woodvale Flats CSO | Tributary of the River Darwen | Not Discharging | 06:06 Dec 21 2024 | 23:52 Jan 18 |