Submarine outfalls exist, existed or have been considered in the following locations, among many others:
;Africa
* Casablanca (Morocco).
* Cape Town (South Africa).
;Asia
* Manila Bay (Philippines).
* Mumbai (India).
* Mutwall ( Sri Lanka).
* Wellawaththa (Sri Lanka).
* Lunawa (Sri Lanka).
;Oceania
* Anglesea, Victoria.
* Geelong, Victoria.
* Sydney (e.g., Bondi Ocean Outfall Sewer)
;Europe
* Barcelona, Spain
* Costa do Estoril (Portugal)
* Marmara Sea near Istanbul (Turkey)
* San Sebastián (Spain)
* Split  (Croatia)
* Thames Estuary downstream of London (UK)
* Edinburgh, Scotland.
;North America
* Honolulu (USA)
* New York Bight (USA)
* Southern California Bight (USA). and
* Victoria, British Columbia, (Canada).
* Santa Monica, United States (world's first) 
* Boston, United States (world's largest) 
* The city of San Diego used Pacific Ocean dilution of primary treated effluent into the 21st century.
;Latin America and the Caribbean
* Cartagena, Colombia
* Ipanema Beach beach from Rio de Janeiro (Brazil). This outfall, built in 1975, discharges untreated wastewater through a pipe with a diameter of 2.4m and a length of 4,775m at a depth of 27m.
* Sosua (Dominican Republic).