The plant is the first in Northern Ireland to use Ultra Violet Light technology - a system that removes bacteria from the treatment process without the use of chemical disinfectants, which improves water quality.
The NI Water Larne Wastewater Treatment Works, which caters for a population of 33,000, will ensure the level of treatment meets European standards.
Minister Murphy said: "This investment will ensure that this facility supports the growth and ongoing development within the area, while protecting the local environment. Protection of the Lough's eco-system is particularly important in this designated Area of Special Scientific Interest.
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"Investment of approximately £1 million per day is taking place in upgrading the water and sewerage system infrastructure. This facility is just one example of the scale of investment required to provide cleaner beaches and rivers, meet European standards, respond to increasing demand and provide the region with a modern service."
Chris Mellor, Chairman and Chief Executive of NI Water said: "Extensive research was conducted into sourcing environmentally friendly technology with a proven track record that could meet the standards set by the Northern Ireland Environment Agency for this area.
"Using UV technology is better for the environment as there are less chemicals used in the treatment processes and it also allows an increase in the capacity of water which can be treated, reducing the likelihood of flooding in the area."
(PR/JM)
