Market ideology often obscures public choices about rea sonable and beneficial uses of water. Current debates in California water policy reflect the tug of war between the potential efficiency and flex ibility of water transfers (often called •water marketing") and the desire for a stable and re liable California water system. The water industry's para mount concern remains the protection of the reliability and stability of operations of its complex socio-technical sys tems for delivering water, particularly at a time when envi ronmental concerns over instream uses of water are increas ing. Loosening restrictions on water transfers while protecting appropriative rights is a fl exible approach to meeting long-term water demand. But given such market imperfections as oligopoly and redistributive land rents, state regulation of transfers of California's most political natural resource-for example, through a drought water bank-remains likely in the future. Since California voters defeated the Peripheral Canal in 1982, many water policy observers have believed the era of capital-intensive, large scale water projects is over. With a liberal admixture of market eco nomics and good old-fashioned Western boosterism, many of these observers, some of them market-oriented resource econom ists, some of them dyed-in-the-wool environmentalists argue that creating a free market for water would help achieve greater efficiency by reallocating water to the highest bidder and, therefore, its most economically bene ficial use. This would postpone the day, perhaps indefin itely, when new capital facilities would be needed to meet the water demands of California's growing economy. This scenario may be too good to be clearly understood. Market ideology often obscures public choices about reasonable and benefi cial uses of water. Market-induced uncertainties make the California water industry nervous because they put the water system's rel iabil ity at risk (Curie 1983, Gottlieb and FitzSimmons 1992). Current debates in California water policy reflect the tug of war between the potential efficiency and flexibility of water transfers (often called •water market ing") and the California water system's stability and reliabil ity. This es say reviews claims justifying a free market in water and focuses on oli gopoly and land rent as significant market imperfections that make state intervention necessary, rendering these claims moot.