The average custodian salary at Fairfield was $90,770 , which is 24 percent higher than the average salary for this job in California, and 28 percent higher than the national average for this job . Custodian salaries at Fairfield typically range from $79,961 to $96,233 (25th to 75th percentile). The highest reported custodian salary was $96,233. There are 3 employees at Fairfield with the job title custodian.