**4. Discussion and conclusions**

The study assumed the scenario "the government guarantees that quality of reclaimed water conforms with city water specifications, no interruption of supply 365 days a year with assured quality and loss indemnification on supply interruption," and that "dedicated pipeline to be installed for reclaimed water delivery, plus with free-of-charge pipe connection," and that "50% deduction on wastewater treatment charge if total consumption of reclaimed water exceeds 40% of total industrial water consumption of the company", factories are willing to purchase the reclaimed water at an average price of 0.48\$/ton. The Scenario mach the policy that Taiwan government wants to promote to use of reclaimed water for new water source other than diversion from river, reservoir water, building new reservoir or groundwater extraction.

 The study results show the WTP under the Scenario exceed the existing price of city water indicate that the assumption of senior as about are the works if which need to be done in the future. We presume the reason behind this are that: 1) the factories that are willing to assist the survey had suffered from water shortage in the past operation and therefore are willing to procure the reclaimed water at a cost higher than the city water under the assumed scenario. 2) It appear to be under the changing climate, the Industrial water users are more concern about the stable water source. 3) We speculated that the Scenario of "50% deduction on wastewater treatment charge" have a great incentives to use reclaimed water.
