This position requires the ability to collect, interpret, and share data. Your interviewers will want to understand your level of familiarity to inform how much support and guidance you might need. When preparing for this question, refer to the job description to understand the level of data interpretation that might be required or desired.
"I have experience interpreting data in the water quality field for several years in educational and professional capacities. I have also interpreted other forms of data, including demographic and other environmental data."