Resumo. Conservation Units (CUs) have ecological and economic importance and, in Brazil, are divided into two categories: full protection and sustainable use. Within the CUs of full protection are the Ecological Stations (ECST), typology where public visitation is prohibited and that demands an effective security apparatus so that its ecological function is achieved. Thus, the objective of the study was to analyze the security of ‘Águas Emendadas’ Ecological Station (AEECST). To do so, from the responses to the questionnaire applied in person to the Environmental Military Police (EMP) of AEECST, it was used the regression analysis to identify the determinants that affect the working conditions of the security in the unit. In addition, it was evaluated the profile of EMP from AEECST by descriptive statistics and investigated working conditions in the unit by correspondence analysis. The determinants for effective security of ESECAE were the contingent size followed by the appreciation of the police by the administration and, finally, the amount of equipment needed to carry out the work of the EMP in the unit. The results showed that the AEECST battalion is experienced and in sufficient quantity, excepting the lack of some basic equipment, in general, working conditions in the unit are satisfactory and the safety is effective, ensuring the limitations of use in the area provided by law.