Lakespan is a conceptual mobile app designed to educate the public about harmful algal blooms (HABs) and promote environmental awareness through citizen engagement. Created in response to the growing health and ecological risks of HABs, the app provides accessible educational resources, live waterway updates, and community-submitted reports to keep users informed and safe. The interactive interface prioritizes ease of use and clarity, allowing users to quickly assess water conditions and contribute their own observations. Lakespan empowers individuals to take part in preserving freshwater ecosystems, blending public health, environmental science, and design into one unified digital platform.