A project finance structure allows waterprojects with attractive cash flows and risk profiles tosecure long-term private capital. But even in industrialcountries the credit strength of off-taking municipalgovernments and the sector's traditional monopolystructure expose lenders to potentially significant credit,regulatory, and political risks. These risks, combined withthe sunk, highly specific, and non-redeployable nature ofwater infrastructure investments, mean that lenders andinvestors are vulnerable to opportunistic contractingproblems and expropriation. Reviewing some recent innovativewater and sanitation projects, the authors show that privatecapital participation on a limited recourse or nonrecoursebasis has required support by third parties such asmultilaterals and federal government agencies to absorbnoncommercial risks.