The Palisades Water Index (ZWI) is a modified equal-dollar weighted stock market index. It is designed to track the performance of companies engaged in the global water industry such as pump and filter manufacturers, water utilities, and irrigation equipment manufacturers. The index was set at 1000 as of December 31, 2003.
The index was developed in 2003 by Steve Hoffmann. He established the Palisades Water Index Associates to manage and license the index.[1] A number of exchange traded funds (ETFs) were established that track the index.[2]
As of August 2008, the components of the index included the following companies:
The PowerShares Water Resources Fund is based on this index.