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In page Pollution in California:

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The use of leaded gasoline up until 1992, when it was phased out, caused a large amount of lead to be introduced into the California water systems. 90% of the lead emitted in California is from leaded gasoline which is higher than the total global emissions from leaded gasoline. The reason it is greater in California is due to the high use of cars in California. The amount of lead in the water system is similar to mercury in that its concentration in the water increases during peak flows. The overall amount of lead recorded in the California water system has been declining over the past few decades.[citation needed]