The tool, which can be used to check if fields are located in a Drinking Water Safeguard Zone before making a decision to spray pesticides, will only be accessible at https://environment.data.gov.uk/farmers/ from 26 July 2019 onwards.
The old address - https://environment-agency.cloud.esriuk.com/farmers/ - will stop working on 26 July 2019.
Further information about what you can do to help protect watercourses from pesticides can be found on the Voluntary Initiative (VI) website.