Based on a comparison of 6 countries in 2014, Poland ranked the highest in Number of Wastewater Treatment Plants (Other - secondary treatment of plants) with 565 followed by Latvia and Estonia. On the other end of the scale was Serbia with 67.0, Croatia with 73.0 and Romania with 197.
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| Country | Unit |
| Austria | |
| Croatia | |
| Cyprus | |
| Estonia | |
| Germany | |
| Latvia | |
| Lithuania | |
| Luxembourg | |
| Netherlands | |
| Poland | |
| Romania | |
| Serbia | |
| Slovakia | |
| Turkey |
| 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 |
| ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... |
| ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | 59.0 | 66.0 | 66.0 | 82.0 | 89.0 | ... | |
| ... | ... | ... | ... | ... | ... | ... | ... | ... | |||||||||||
| ... | ... | ... | ... | ... | ... | ... | ... | ... | 176 | 240 | 250 | 254 | ... | ||||||
| ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | 478 | ... | ... | ... | ... | |||
| ... | ... | ... | ... | ... | ... | ... | ... | 135 | 202 | 219 | ... | ||||||||
| ... | ... | ... | ... | ... | ... | ... | ... | ... | 103 | 100 | 119 | 124 | 121 | ... | ... | ||||
| ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | |
| 138 | 148 | 157 | 154 | 154 | ... | ... | |||||||||||||
| 598 | 613 | 602 | 587 | 575 | ... | ||||||||||||||
| ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | 135 | 135 | 183 | 179 | 207 | |||||
| ... | ... | ... | ... | ... | 65.0 | 69.0 | 57.0 | 51.0 | 60.0 | ... | |||||||||
| ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | |
| ... | ... | ... | ... | ... | ... | ... | 937 | ... | 1,160 | ... | 1,307 | ... | ... |
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