Earth Day is one of the most widely recognized environmental events in the world. Every April 22, millions of people take part in activities focused on protecting the planet. But behind the cleanups and campaigns is a deeper story about how it started, what it represents, and why it continues to matter today.

Here are five things to know.

The Ecology Flag Was Created for the First Earth Day

The green and white Ecology Flag, often associated with early Earth Day imagery, was created in 1970 to help promote the first Earth Day. It quickly became a symbol of a growing environmental movement.

Its design was intentional. The green represents land, the white represents clean air, and the symbol reflects the relationship between living systems and the environment. It was simple, recognizable, and rooted in the idea that environmental awareness should be shared by everyone.

The First Earth Day Was a Massive Public Movement

The first Earth Day in 1970 brought together an estimated 20 million people across the United States. Communities organized teach-ins, demonstrations, and local events focused on pollution, conservation, and environmental protection.

It marked a turning point. Environmental issues moved from the margins into mainstream conversation and public policy.

It Helped Drive Real Change

Earth Day was not just symbolic. It helped build momentum for major environmental protections, including clean air and water regulations and the establishment of the Environmental Protection Agency.

It showed that public awareness, when combined with collective action, can lead to lasting impact.

The Message Has Expanded, But the Core Idea Remains

What began as a U.S.-based movement is now observed in more than 190 countries. Today’s Earth Day includes a wide range of focus areas, from climate education to waste reduction to sustainable resource management.

The 2026 theme, “Our Power, Our Planet,” reinforces a message that has been consistent from the beginning. Change happens when individuals and communities take action together.

Resource Management of Water Is Central to the Conversation Today

While early Earth Day efforts focused heavily on pollution, today’s conversations increasingly include how resources are used and managed over time.

Water, in particular, plays a critical role. From agriculture to landscapes to urban environments, how water is managed has a direct impact on sustainability, cost, and long-term environmental health.

From the first Earth Day in 1970 to today’s global movement, one idea has remained constant. Progress happens when awareness turns into action.

Whether it is large-scale policy or everyday decisions, the way resources are managed continues to shape long-term outcomes. Small improvements, applied consistently, can have a meaningful impact over time.

Explore ways to improve water efficiency this season.

You have the ability to improve long-term sustainability and performance through smarter water management. See our other Water Connections blogs for practical tips and proven approaches to reducing water waste and improving efficiency across your systems.