Water quality improvements: a contingent valuation study of the Chao Phraya river

Water quality improvements: a contingent valuation study of the Chao Phraya river

Are Bangkok residents willing to pay extra money in order to increase the water quality of the Chao Phraya river?

To assess how much the cleanliness of the Chao Phraya river is worth to the residents of Bangkok, this study

  • estimates the willingness of Bangkok residents to pay for improved water quality by conducting a contingent valuation survey
  • suggests economic instruments to encourage this willingness to pay, such as user fees, property taxes, and other measures.

The study offers several variants of the contingent valuation method survey. In one variant, households are presented two possible water quality scenarios. They are simply asked how much they are willing to pay for wastewater treatment charges for the following scenarios:

  • Scenario 1: Improve the water quality from ‘boatable’ to a level where fishing could take place
  • Scenario 2: Further improve water quality from ‘boatable’ to a level where swimming is possible.

Main conclusion: deteriorating water quality in Bangkok is one of the major problems and the treatment might be inevitable. In addition, more than two-thirds of the respondents under the survey indicated their willingness to pay for the water treatment service should it be available, whether to improve quality to enable fishes to live in it or to allow for swimming

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