STW Resources Holding Corp , an integrated provider of water management, including water reclamation and remediation, and oilfield services, announced today the completion of the previously announced contract for the custom design, engineering and construction of the Horizon City Municipal Utility District Reverse Osmosis Concentrator. STW Water, a wholly-owned subsidiary of STW Resources, was selected as the manufacturer/technology integrator for the $2.2 million project and will maintain the system under a contract with Horizon City.