The contract is worth up to £50m over the next six years.
Fife-based PSI, and Yorkshire-based Lintott Control Systems have been appointed as Framework Suppliers for Chemical Dosing Equipment.
The contract will see Scottish Water provided with standardised chemical dosing systems for water treatment works.
The systems are pre-assembled in a factory before delivery into water treatment works.
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Ken Hutchison, Scottish Water's Capital Delivery Controller, said: "The quality of drinking water received by customers through their taps has never been higher, and in the years ahead we want to build on the improvements which have been made to our services.
"Investing in our infrastructure will ensure our treatment works and network of pipes are of the highest possible standard for the benefit of our customers.
"Dosing equipment forms an important part of the water treatment process and by adopting standardised designs for these installations at Scottish Water, we can make savings on design costs and ensure consistency in the roll-out of new equipment."
The contract was awarded following an open tendering process.
(LM)
