Setting up a database of compliance obligations may differ from country to country because legal and regulatory information may be more or less accessible in terms of easiness and completeness.
Start with your environmental assessment to determine environmental aspects and impacts. Then, you have to search the list of legislation applicable to your organization concerning each environmental aspect and impact. In my country, I use the services of an organization that sends me an email every day informing if there are changes in legislation at local, national and European Union level. Through them, I have access to all the environmental legislation of my country. I know organizations that have a similar service from their sector association, or some legal service from lawyers’ firms. Other organizations keep the information updated by searching frequently if any new or revised law was published.