The extensive rebuilding and refurbishment work forms part of an estimated £60m investment in the region.
Works will take place between 2020 and 2025 across several sites including Seedy Mill water treatment works near Lichfield and Hampton Loade water treatment works near Bridgnorth.
Both schemes will be delivered to BIM level 2 compliance.
Andy Langman, managing director for the water business unit, said: “We are looking forward to working in collaboration with South Staffs Water and delivering this long-term plan to benefit their customers.”
Phil Newland, managing director at South Staffs Water, said: “This contract with nmcn represents a programme of investment that will substantially improve both the quality of the water and the resilience of our water treatment works.”