Environmental Decline
The lack of an outflow means that the Salton Sea is a system of accelerated change. Variations in agricultural runoff cause fluctuations in water level (and flooding of surrounding communities in the 1950s and 1960s), and the relatively high salinity of the inflow feeding the Sea has resulted in ever increasing salinity. By the 1960s it was apparent that the salinity of the Salton Sea was rising, jeopardizing some of the species in it. The Salton Sea has a salinity exceeding 4.0% w/v (saltier than seawater) and many species of fish can no longer survive. It is believed that once the salinity surpasses 4.4% w/v, only the tilapia will survive. Fertilizer runoffs combined with the increasing salinity have resulted in large algal blooms and elevated bacteria levels.
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