| 28 Tythebarn St | River Darwen | Not Discharging | 17:57 Oct 24 | 24:57 Oct 27 |
| Anyon Street/Laurel Ave CSO | Culverted tributary of River Darwen (Union Street) | Not Discharging | 12:00 Oct 26 | 24:57 Oct 27 |
| Aqueduct Road CSO | River Darwen | Not Discharging | 22:01 Oct 24 | 24:57 Oct 27 |
| Back Queens Park Rd | Culverted Tributary of River Blakewater | Not Discharging | 18:06 Feb 27 | 24:57 Oct 27 |
| Balle Street Hilton Street CSO | Culverted section of River Darwen | Not Discharging | 02:26 Oct 10 | 24:57 Oct 27 |
| Balle Street Hilton Street CSO | A culverted section of the River Darwen via a surface water sewer | Not Discharging | 18:14 Oct 24 | 24:57 Oct 27 |
| Belgrave Road CSO | Tributary of the River Darwen | Not Discharging | 09:02 Aug 25 2025 | 24:57 Oct 27 |
| Bolton Road Combined Sewer Overflow | River Darwen | Not Discharging | 14:29 Oct 25 | 24:57 Oct 27 |
| Bolton Road CSO | Unnamed tributary of the River Darwen | Not Discharging | 17:24 Oct 24 | 24:57 Oct 27 |
| Bolton Road CSO | Culverted Tributary of the River Darwen | Not Discharging | 06:48 Oct 26 | 24:57 Oct 27 |
| Church Street/Parliament Street CSO | Culverted section of River Darwen | Not Discharging | 17:56 Oct 24 | 24:57 Oct 27 |
| Clarence Street CSO | River Darwen | Not Discharging | 19:40 Oct 24 | 24:57 Oct 27 |
| Coal Pit Lane CSO | River Medlock (via surface water sewer) | Not Discharging | 19:04 Oct 24 | 24:57 Oct 27 |
| Cotton Hall Street CSO | Culverted tributary of River Darwen | Not Discharging | 20:32 Oct 24 | 24:57 Oct 27 |
| Cranberry Lane CSO | Unnamed tributary of the River Darwen | Not Discharging | 18:00 Oct 24 | 24:57 Oct 27 |
| Cumberland Street CSO | Queens Park Culvert (Tributary of River Blakewater) | Not Discharging | 18:20 Oct 24 | 24:57 Oct 27 |
| Dickens Street CSO | Queens Park Culvert (tributary of River Blakewater) | Not Discharging | 15:44 Oct 26 | 24:57 Oct 27 |
| Footpath Nr Cross St CSO | River Darwen | Not Discharging | 12:30 Dec 09 2025 | 24:57 Oct 27 |
| Grimshaw Park CSO | Culverted section of an unnamed trib. of River Blakewater | Not Discharging | 13:17 Mar 09 | 24:57 Oct 27 |
| Grimshaw Street CSO | River Darwen via SWS | Not Discharging | 18:14 Oct 24 | 24:57 Oct 27 |
| Higher Perry St/Black Laurel St CSO | Culverted tributary of River Darwen via surface water sewer | Not Discharging | 12:00 Oct 26 | 24:57 Oct 27 |
| Hindle Street CSO | River Darwen via surface water sewer | Not Discharging | 18:00 Oct 24 | 24:57 Oct 27 |
| Infirmary Street CSO 05050 | Leeds Liverpool Canal | Not Discharging | 02:24 Jan 01 2025 | 24:57 Oct 27 |
| Kay Street CSO | Culverted tributary of the River Darwen | Not Discharging | 02:30 Jan 27 2025 | 24:57 Oct 27 |
| Lower Audley CSO | Culverted tributary of River Blakewater | Not Discharging | 20:16 Oct 24 | 24:57 Oct 27 |
| Lower Eccleshill Road CSO | River Darwen | Not Discharging | 11:22 Oct 25 | 24:57 Oct 27 |
| Merchants Landing Culvert St CSO | River Blakewater via the Culvert street culvert | Not Discharging | 09:40 Sep 28 | 24:57 Oct 27 |
| Pringle Street CSO | Culverted tributary of River Blakewater | Not Discharging | 16:00 Jul 15 2025 | 24:57 Oct 27 |
| Queens Road (Darwen) CSO | Culverted tributary of the River Darwen | Not Discharging | 12:52 Apr 08 2025 | 24:57 Oct 27 |
| Railway Road/South Street CSO | A culverted section of River Darwen | Not Discharging | 22:50 Jul 08 2025 | 24:57 Oct 27 |
| Redearth Road/Sudell Road CSO | Culverted section of River Darwen | Not Discharging | 09:26 Aug 20 | 24:57 Oct 27 |
| Sharples Street CSO | Culverted tributary of River Darwen | Not Discharging | 12:28 Oct 26 | 24:57 Oct 27 |
| Sudell Road CSO | Culverted tributary of River Darwen | Not Discharging | 18:16 Oct 24 | 24:57 Oct 27 |
| Sudellside Street | Culverted tributary of the River Darwen via a surface water sewer | Not Discharging | 14:16 Jun 24 2025 | 24:57 Oct 27 |
| Vale Street | Tributary of the River Darwen | Not Discharging | 14:26 Oct 25 | 24:57 Oct 27 |
| Waterside CSO 052z1 | Waterside Brook | Not Discharging | 24:18 Dec 18 2025 | 24:57 Oct 27 |
| Wellington Road CSO | River Darwen | Not Discharging | 20:56 Sep 20 2025 | 24:57 Oct 27 |
| Woodvale Flats CSO | Tributary of the River Darwen | Not Discharging | 12:14 Mar 22 | 24:57 Oct 27 |