TopNav Template photo identifier

Survey of Permitted and Inspected Customers

Survey Methodology

To ensure the results are statistically valid and the surveying is confidential and nonpartisan, we contract with a statistics service to perform the survey. From 2002 to 2014, we contracted with the U.S. Department of Agriculture’s National Agricultural Statistics Service. Starting in 2016, we are contracting with the Social and Economic Research Center at Washington State University.


  1. The statistics service takes a stratified random sample of permitted and inspected customers and selects them for the survey; meaning that they randomly select which customers to survey from within each category of permit or inspection type.

  2. Trained surveyors call the selected customers and conduct the survey over the phone.

  3. The statistics service then uses statistical software to enter the response data, tabulate the answers, and report the results to Ecology. To ensure confidentiality, the statistics service only provides Ecology with the final tabulated results.

Customer Response