A survey was conducted to assess environmental data users' interest in a referral system such as the National Environmental Data Referral Service (NEDRES) and to gauge user willingness to participate in a proposed NEDRES network and to comply with a system of NEDRES user fees. Twenty-one organizations were identified and 3,200 individuals were randomly selected for the survey. Valid responses from 794 individuals (25.2 percent) were returned. The survey addressed four areas of concern: Is there a need for NEDRES services? What is the ideal system configuration? What should the data base contain? How willing are potential users to participate in and pay for the service? Findings indicate that NEDRES would be useful, a computer searchable file of environmental data sources would be the most useful of proposed NEDRES services, and that on-line searching was the preferred method of accessing NEDRES. Additional findings indicate that NEDRES should include descriptions of the measured environmental parameters of each file listed, almost half of the respondents expressing a willingness to provide indexes of their data holdings to NEDRES, acceptability of training-related costs, and that nearly 30 percent were willing to pay for NEDRES services, although most preferred a "pay-as-you-go" system. (JN)