Addiction staffing levels in the West and Northwest Community health organisation are the lowest in the country.
Data from the HSE reveal that there are 58.1 full time equivalent employees in the region, with the closest being HSE Midwest with 91.33.
The highest levels were in the Dublin and Midlands region, with 204.61.
Galway West Fianna Fáil TD John Connolly says that key positions in the service are not filled.