| 28 Tythebarn St | River Darwen | Not Discharging | 18:42 Mar 24 | 16:36 Jun 13 |
| Accrington Road CSO | Culverted section of Knuzden Brook | Not Discharging | 04:14 Jun 10 | 16:36 Jun 13 |
| Anyon Street/Laurel Ave CSO | Culverted tributary of River Darwen (Union Street) | Not Discharging | 01:14 May 28 | 16:36 Jun 13 |
| Back Queens Park Rd | Culverted Tributary of River Blakewater | Not Discharging | 18:06 Feb 27 | 16:36 Jun 13 |
| Balle Street Hilton Street CSO | Culverted section of River Darwen | Not Discharging | 11:38 Jun 11 | 16:36 Jun 13 |
| Balle Street Hilton Street CSO | A culverted section of the River Darwen via a surface water sewer | Not Discharging | 04:20 Jun 10 | 16:36 Jun 13 |
| Belgrave Road CSO | Tributary of the River Darwen | Not Discharging | 09:02 Aug 25 2025 | 16:36 Jun 13 |
| Bolton Road CSO | Unnamed tributary of the River Darwen | Not Discharging | 19:40 Nov 11 2025 | 16:36 Jun 13 |
| Bolton Road CSO | Culverted Tributary of the River Darwen | Not Discharging | 05:14 Jun 09 | 16:36 Jun 13 |
| Bolton Road/Astley Street CSO | Kebbs Brook via a culvert, a tributary of the River Darwen | Not Discharging | 16:55 Apr 15 | 16:36 Jun 13 |
| Church Street/Parliament Street CSO | Culverted section of River Darwen | Not Discharging | 06:02 Jun 08 | 16:36 Jun 13 |
| Clarence Street CSO | River Darwen | Not Discharging | 06:32 Jun 08 | 16:36 Jun 13 |
| Coal Pit Lane CSO | River Medlock (via surface water sewer) | Not Discharging | 16:14 May 13 | 16:36 Jun 13 |
| Cotton Hall Street CSO | Culverted tributary of River Darwen | Not Discharging | 06:10 Jun 08 | 16:36 Jun 13 |
| Cranberry Lane CSO | Unnamed tributary of the River Darwen | Not Discharging | 16:56 Apr 15 | 16:36 Jun 13 |
| Cumberland Street CSO | Queens Park Culvert (Tributary of River Blakewater) | Not Discharging | 06:12 Jun 08 | 16:36 Jun 13 |
| Dickens Street CSO | Queens Park Culvert (tributary of River Blakewater) | Not Discharging | 01:38 May 28 | 16:36 Jun 13 |
| Footpath Nr Cross St CSO | River Darwen | Not Discharging | 12:30 Dec 09 2025 | 16:36 Jun 13 |
| Grimshaw Park CSO | Culverted section of an unnamed trib. of River Blakewater | Not Discharging | 13:17 Mar 09 | 16:36 Jun 13 |
| Grimshaw Street CSO | River Darwen via SWS | Not Discharging | 04:12 Jun 10 | 16:36 Jun 13 |
| Higher Perry St/Black Laurel St CSO | Culverted tributary of River Darwen via surface water sewer | Not Discharging | 11:34 Jun 11 | 16:36 Jun 13 |
| Hindle Street CSO | River Darwen via surface water sewer | Not Discharging | 01:14 May 28 | 16:36 Jun 13 |
| Kay Street CSO | Culverted tributary of the River Darwen | Not Discharging | 02:30 Jan 27 2025 | 16:36 Jun 13 |
| Lower Audley CSO | Culverted tributary of River Blakewater | Not Discharging | 22:32 Jun 07 | 16:36 Jun 13 |
| Lower Eccleshill Road CSO | River Darwen | Not Discharging | 17:44 Jun 11 | 16:36 Jun 13 |
| Merchants Landing Culvert St CSO | River Blakewater via the Culvert street culvert | Not Discharging | 08:30 Jun 12 | 16:36 Jun 13 |
| Pringle Street CSO | Culverted tributary of River Blakewater | Not Discharging | 16:00 Jul 15 2025 | 16:36 Jun 13 |
| Queens Park Road CSO | Queens Park Culvert and then to the River Blakewater via surface water sewer | Not Discharging | 06:20 Jun 08 | 16:36 Jun 13 |
| Railway Road/South Street CSO | A culverted section of River Darwen | Not Discharging | 22:50 Jul 08 2025 | 16:36 Jun 13 |
| Redearth Road/Sudell Road CSO | Culverted section of River Darwen | Not Discharging | 18:18 Sep 20 2025 | 16:36 Jun 13 |
| Sudell Road CSO | Culverted tributary of River Darwen | Not Discharging | 06:04 Jun 08 | 16:36 Jun 13 |
| Sudellside Street | Culverted tributary of the River Darwen via a surface water sewer | Not Discharging | 14:16 Jun 24 2025 | 16:36 Jun 13 |
| Vale Street | Tributary of the River Darwen | Not Discharging | 11:14 Jun 11 | 16:36 Jun 13 |
| Waterside CSO 052z1 | Waterside Brook | Not Discharging | 24:18 Dec 18 2025 | 16:36 Jun 13 |
| Woodvale Flats CSO | Tributary of the River Darwen | Not Discharging | 12:14 Mar 22 | 16:36 Jun 13 |
