The average custodial salary at Onalaska Isd was $18,651 , which is 29 percent lower than the average salary for this job in Texas, and 43 percent lower than the national average for this job . Custodial salaries at Onalaska Isd typically range from $17,363 to $19,536 (25th to 75th percentile). The highest reported custodial salary was $22,135. There are 10 employees at Onalaska Isd with the job title custodial.