If you are in England, UK:

 

 

Consumer Council for Water : Consumer Council for Water via kwout

 

 

If you are in Victoria, Australia:

 

 

 

If you are in Indonesia:

 

 

 

 

With one caveat however. The Indonesian Ombudsman does not deal particularly with water (or utilities issues). So I have no idea how they can help, especially when the service is privatized. Read my article here.

 

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Missing water and shadow users
Human Right Aspects of Private Sector Participation in the Water Sector
14 Disturbing Facts about Jakarta's Water
Water companies duty to satisfy reasonable demands