| 28 Tythebarn St | River Darwen | Not Discharging | 08:27 Dec 10 2025 | 14:03 Jan 28 |
| Anyon Street/Laurel Ave CSO | Culverted tributary of River Darwen (Union Street) | Not Discharging | 10:22 Jan 27 | 14:03 Jan 28 |
| Aqueduct Road CSO | River Darwen | Not Discharging | 14:52 Jan 27 | 14:03 Jan 28 |
| Back Queens Park Rd | Culverted Tributary of River Blakewater | Not Discharging | 02:04 Dec 15 2025 | 14:03 Jan 28 |
| Balle Street Hilton Street CSO | Culverted section of River Darwen | Not Discharging | 09:44 Jan 27 | 14:03 Jan 28 |
| Balle Street Hilton Street CSO | A culverted section of the River Darwen via a surface water sewer | Not Discharging | 09:42 Jan 27 | 14:03 Jan 28 |
| Belgrave Road CSO | Tributary of the River Darwen | Not Discharging | 09:02 Aug 25 2025 | 14:03 Jan 28 |
| Bolton Road Combined Sewer Overflow | River Darwen | Not Discharging | 10:04 Jan 27 | 14:03 Jan 28 |
| Bolton Road CSO | Unnamed tributary of the River Darwen | Not Discharging | 19:40 Nov 11 2025 | 14:03 Jan 28 |
| Bolton Road CSO | Culverted Tributary of the River Darwen | Not Discharging | 09:28 Jan 18 | 14:03 Jan 28 |
| Bolton Road/Astley Street CSO | Kebbs Brook via a culvert, a tributary of the River Darwen | Not Discharging | 08:00 Dec 10 2025 | 14:03 Jan 28 |
| Church Street/Parliament Street CSO | Culverted section of River Darwen | Not Discharging | 11:48 Nov 28 2025 | 14:03 Jan 28 |
| Clarence Street CSO | River Darwen | Not Discharging | 10:26 Jan 27 | 14:03 Jan 28 |
| Coal Pit Lane CSO | River Medlock (via surface water sewer) | Not Discharging | 15:00 Dec 15 2025 | 14:03 Jan 28 |
| Cotton Hall Street CSO | Culverted tributary of River Darwen | Not Discharging | 10:38 Jan 27 | 14:03 Jan 28 |
| Cranberry Lane CSO | Unnamed tributary of the River Darwen | Not Discharging | 23:46 Sep 20 2025 | 14:03 Jan 28 |
| Cumberland Street CSO | Queens Park Culvert (Tributary of River Blakewater) | Not Discharging | 08:30 Dec 10 2025 | 14:03 Jan 28 |
| Dickens Street CSO | Queens Park Culvert (tributary of River Blakewater) | Not Discharging | 13:56 Dec 13 2025 | 14:03 Jan 28 |
| Footpath Nr Cross St CSO | River Darwen | Not Discharging | 12:30 Dec 09 2025 | 14:03 Jan 28 |
| Grimshaw Park CSO | Culverted section of an unnamed trib. of River Blakewater | Not Discharging | 20:18 Jul 22 2025 | 14:03 Jan 28 |
| Grimshaw Street CSO | River Darwen via SWS | Not Discharging | 13:38 Jan 12 | 14:03 Jan 28 |
| Higher Perry St/Black Laurel St CSO | Culverted tributary of River Darwen via surface water sewer | Not Discharging | 10:14 Jan 27 | 14:03 Jan 28 |
| Hindle Street CSO | River Darwen via surface water sewer | Not Discharging | 08:28 Dec 10 2025 | 14:03 Jan 28 |
| Infirmary Street CSO 05050 | Leeds Liverpool Canal | Not Discharging | 02:24 Jan 01 2025 | 14:03 Jan 28 |
| Kay Street CSO | Culverted tributary of the River Darwen | Not Discharging | 02:30 Jan 27 2025 | 14:03 Jan 28 |
| Lower Audley CSO | Culverted tributary of River Blakewater | Not Discharging | 09:24 Jan 27 | 14:03 Jan 28 |
| Lower Eccleshill Road CSO | River Darwen | Not Discharging | 14:45 Jan 27 | 14:03 Jan 28 |
| Merchants Landing Culvert St CSO | River Blakewater via the Culvert street culvert | Not Discharging | 13:22 Jan 26 | 14:03 Jan 28 |
| Pringle Street CSO | Culverted tributary of River Blakewater | Not Discharging | 16:00 Jul 15 2025 | 14:03 Jan 28 |
| Queens Road (Darwen) CSO | Culverted tributary of the River Darwen | Not Discharging | 12:52 Apr 08 2025 | 14:03 Jan 28 |
| Railway Road/South Street CSO | A culverted section of River Darwen | Not Discharging | 22:50 Jul 08 2025 | 14:03 Jan 28 |
| Redearth Road/Sudell Road CSO | Culverted section of River Darwen | Not Discharging | 18:18 Sep 20 2025 | 14:03 Jan 28 |
| Sharples Street CSO | Culverted tributary of River Darwen | Not Discharging | 18:14 Jan 27 | 14:03 Jan 28 |
| Sudell Road CSO | Culverted tributary of River Darwen | Not Discharging | 09:58 Jan 27 | 14:03 Jan 28 |
| Sudellside Street | Culverted tributary of the River Darwen via a surface water sewer | Not Discharging | 14:16 Jun 24 2025 | 14:03 Jan 28 |
| Vale Street | Tributary of the River Darwen | Not Discharging | 05:48 Sep 12 2025 | 14:03 Jan 28 |
| Waterside CSO 052z1 | Waterside Brook | Not Discharging | 24:18 Dec 18 2025 | 14:03 Jan 28 |
| Wellington Road CSO | River Darwen | Not Discharging | 20:56 Sep 20 2025 | 14:03 Jan 28 |
| Woodvale Flats CSO | Tributary of the River Darwen | Not Discharging | 04:02 Apr 19 2025 | 14:03 Jan 28 |