Important issues in the cleanups of illegal dumping sites of hazardous waste are cost, time, and safety. Two types of response actions, removal actions (off-site cleanups), and remedial actions (on-site cleanups), are likely to depend on these factors. However, the empirical evidence on this is lacking. Consequently, this study examines the determinants of removal decisions about dumped waste and contaminated soil from the site. Moreover, it examines the determinants of costs and periods to cleanup illegal dumping sites. This study indicates that removal actions tend not to be selected as the amount of dumped waste increases in case of pooled data. Removal actions tend to be selected when toxic materials are included in the sites in case of full removal and pooled data. Partial removals tend to be selected in higher income municipalities than in lower income ones, though this result is not an excellent fit to the model. Furthermore, this study shows that full and partial removal raises cleanup costs by approximately 236 and 180 %, respectively. However, the cleanup period remains unchanged regardless of whether removal or remedial actions are taken. On the other hand, inclusion of toxic waste prolongs the disposal period by approximately 69 %.