National Irrigation Authority is a United States-focused information and provider network for landscaping and irrigation services. It brings together provider listings, technical guidance, and regulatory references to help homeowners, businesses, and other users understand the services available and make more informed choices. Its coverage ranges from residential lawn irrigation to commercial landscape systems, with emphasis on water management, system design, efficiency, and contractor qualifications.

The site offers resources on irrigation installation, audits, seasonal startup and winterization, maintenance, scheduling, and cost planning. It explains system types and components, including drip and micro-irrigation, sprinklers, smart controllers, soil-moisture sensors, and backflow prevention. Additional guidance addresses zoning, water budgeting, conservation strategies, rainwater harvesting, greywater reuse, and drought-tolerant landscaping. Visitors can also consult material on applicable codes, standards, licensing requirements, and qualifications to consider when selecting a provider. National Irrigation Authority features published provider profiles and a process to claim a listing, alongside sourced articles, official updates, and editorial policies for corrections and contributions.