Water and wastewater companies with the highest environmental ratings also perform the best financially, according to a study by Innovest Strategic Value Advisors. British-based companies, Severn Trent Plc, and AWG Plc, and the French company, Vivendi Universal, received the highest Innovest EcoValue 21 environmental performance ratings, and the report predicts that they will outperform the rest of the water and waste management sector in the future.