The highest salary for a Registered Respiratory Therapist (RRT) in California can reach approximately $146,061 annually, which typically corresponds to the top earners in the field. This figure reflects those with extensive experience, advanced certifications, or specialized skills that command higher compensation. On an hourly basis, top earners may earn around $70 per hour. It's important to note that salaries vary depending on factors such as geographic location, level of experience, workplace setting, and additional qualifications. Overall, while the average salary for RRTs in California is about $100,305 annually, the highest earners can significantly exceed this amount, highlighting the potential for lucrative career growth within the respiratory therapy profession.