Mulgoa MP Tanya Davies has announced the St Marys methadone clinic will be relocated to Mount Druitt.
Mrs Davies has confirmed the speculation the Star broke exclusively last month that the clinic will be relocated from Queen Street to Mount Druitt Hospital.
The Star has been following this story since Mrs Davies announced in her speech on 2011 state election night that relocating the clinic was one of her three priorities.
Mrs Davies is delighted about the Ministry of Health's decision
''This is a monumental shift for St Marys businesses and the community,'' she said.
''It puts St Marys on a level playing field with Penrith in terms of investment opportunities and allows small businesses to grow.
She is unsure whereabouts the clinic will go on hospital grounds but said it is scheduled to be relocated mid next year.
Half of the clinic's clients are from Mount Druitt, according to Mrs Davies.
''It means a far better service on a hospital campus and easier access to additional services,'' she said.
Mount Druitt MP Richard Amery is disappointed at the decision but feared it would happen.
''I can't believe it,'' he said.
''It's not a good exchange.''
Initial reaction on social media has been mixed.
Join the conversation on the St Marys-Mt Druitt Star Facebook page or comment at stmarysstar.com.au
More on this story in the December 17 edition.