As the Yarra became unsuitable as a source of water, several attempts were made to find alternative sources for the growing population of Melbourne. It was not until 1891 that the efforts to sewer Melbourne came to fruition with the setting up of the Melbourne Metropolitan Board of Works (MMBW), now known as Melbourne Water. From 1891 until 1992, it was the responsibility of the MMBW to safeguard public health by providing a sewerage system and a safe water supply system. In 1992, The MMBW merged with a number of smaller urban water authorities to form Melbourne Water
This MMBW flag is of historical significance for its association with the former Melbourne and Metropolitan Board of Works (MMBW). This flag is relatively intact with only two of its kind held in the collection. The flag is significant as is represents a proud organisation and demonstrates the organisations historical development of services, a strong theme of the collection. The flags navy and gold colour is aesthetically pleasing while the coat of arms represented on the flag holds great meaning.
Navy and gold Melbourne Metropolitan Board of Works (MMBW) flag with the Southern Cross and MMBW coat of arms. The coat of arms incorporates Melbourne and the United Kingdom, and the motto of the board 'Publica Merces Salus Mea', 'Public Health is my Reward'.