| Year (number of countries) | Collected without treatment | Primary | Secondary | Tertiary |
|---|---|---|---|---|
| NORTHERN | ||||
| 1990 (3) | 0 | 5.9 | 0.4 | 59.2 |
| 1995 (4) | 0 | 3.6 | 3.1 | 74.6 |
| 2000 (4) | 4.9 | 5.7 | 2.6 | 72.1 |
| 2002 (4) | 4.6 | 5 | 2.9 | 72.9 |
| 2005-2006 (3) | 5.6 | 7.8 | 3.9 | 71.4 |
| 2010 (3) | 0.9 | 5.3 | 2.3 | 76.6 |
| CENTRAL | ||||
| 1990 (6) | 0 | 6.9 | 60.1 | 15.9 |
| 1995 (8) | 0.1 | 5.2 | 31.4 | 51.2 |
| 2003-2004 (6) | 2.6 | 0 | 21.6 | 71 |
| 2005-2006 (6) | 2 | 0.1 | 22.1 | 72.7 |
| 2007-2009 (6) | 1.1 | 2.09 | 21.56 | 70.4 |
| 2010 (7) | 0.2 | 0.66 | 19.54 | 77.36 |
| SOUTHERN | ||||
| 1994-5 (3) | 0 | 15.4 | 33 | 4.4 |
| 1997-2000 (4) | 0.6 | 7.8 | 63.4 | 14.9 |
| 2003-4 (4) | 0.5 | 0.8 | 49.2 | 36.7 |
| 2005-2007 (6) | 0.5 | 0.8 | 52.2 | 37.5 |
| 2008-2009 (4) | 0.4 | 1.6 | 30.9 | 49.3 |
| 2010-2011 (3) | 2 | 3 | 32.8 | 60.3 |
| EASTERN | ||||
| 1995 (3) | 4.9 | 6.9 | 27.6 | 4.1 |
| 2000-2001 (5) | 1.6 | 6.8 | 24.3 | 17.7 |
| 2004-2005 (8) | 13.8 | 4.7 | 19.1 | 34.2 |
| 2007 (8) | 12.9 | 1.9 | 19.6 | 39.2 |
| 2009 (7) | 12.9 | 1 | 13.3 | 48 |
| 2011 (6) | 13.1 | 1.3 | 10.6 | 51.5 |
| SOUTH EASTERN | ||||
| 1995 (2) | 0 | 5.4 | 6.8 | 0 |
| 1998 (2) | 41.5 | 7.2 | 11.1 | 0 |
| 2004 (3) | 26.7 | 9.9 | 21 | 2.5 |
| 2006 (3) | 24.3 | 11.9 | 20.2 | 7.2 |
| 2007-2008 (3) | 20.6 | 12.7 | 20.5 | 8.6 |
| 2010-2011 (3) | 21.5 | 12.4 | 21.8 | 15.6 |
| WEST BALKAN | ||||
| 2003 (3) | 8.4 | 1.7 | 3.2 | 0.3 |
| 2005 (3) | 27.9 | 1.9 | 3.7 | 0.3 |
| 2007 (3) | 30.4 | 2 | 4 | 0.3 |
| 2009-2010 (4) | 37.3 | 1.4 | 4.7 | 0.7 |
| 2011-2012 (3) | 43.1 | 0.7 | 6.2 | 0.8 |