Welcome to Custom Built Pools and Spas - DBA Rasmussen Pools, your trusted swimming pool contractor in Fontana, CA. With over 50 years of experience, we have proudly served the Inland Empire, continuing a family legacy of creating custom pools and spas that elevate outdoor living spaces. Whether you're envisioning a serene retreat or a lively entertainment hub, we bring your dream to life through impeccable craftsmanship and attention to detail. No project is too big or small - we are committed to excellence in everything we do.