National Office of Sanitation of Tunisia (ONAS)

ONAS was established by Law No. 73/74 of 3 August 1974, with the mission of ensuring the management of the sanitation sector.

The Law Establishing the Office was amended by Law No. 93/41, dated April 19, 1993, under which ONAS moved from the role of manager of the sewerage system to that of main stakeholder in the field of the protection of the water environment and the fight against all sources of pollution.

ONAS is a public institution of an industrial and commercial character, endowed with the civil personality and the financial autonomy. It is under the supervision of the Ministry of Local Affairs and Environment