Castle Aquatics
Heirloom water features for serious gardens
Cast-stone fountains, koi pond systems, and architectural waterfalls — engineered in California, built to last a generation.
20-Year Warranties
Engineered in California
White-Glove Freight Delivery
Direct Access to Pond Builders
Show-Grade Koi Filtration
Our story
Built by pond people, for pond people.
Castle Aquatics was founded in Hayward, California by James Holt — a third-generation pond builder who got tired of cheap imports. Today our team designs and assembles fountains, filtration systems, and complete pond kits to a single standard: good enough to put in our own gardens.
Engineered to outlast every other water feature in your yard ·
Designed for koi welfare ·
Built and supported in the United States ·