On 1 Jul 2002, Ondeo began a US$ 4 billion (EUR 4 billion), 10-year waterworks operations and maintenance (O&M) contract for Puerto Rico Aqueduct and Sewer Authority (PRASA). The contract, awarded to Ondeo in conjunction with its US subsidiary United Water in May 2002, is the largest O&M contract for water services ever awarded, with the venture beating the Water Company (a subsidiary of Vivendi Environnement) and Thames Water to win the deal. The terms of the contract include an extension provision and cover the production and distribution of drinking water for all four million of Puerto Rico's inhabitants. It also includes the collection and treatment of wastewater for the entire island. Ondeo is responsible for operation, maintenance, and renovation of the infrastructure, client service, and human resources management.

Source: Frost & Sullivan, 3 Jul 2002