1. Act 681/2014 on the Amendment of the Water Services Act, 2014.(Original in Finnish) FINLEX ® - Säädöksetalkuperäisinä: 681/2014. .
2. ASCE, 2013a. Failure to act: The impact of current investment trend on America's economic future. .
3. ASCE, 2013b.2013 Report card for America's infrastructure.http://www.infrastructurereportcard.org/a/#p/grade-sheet/gpa.
4. AWWA, 2013. 2013 AWWA State of the Water Industry Report. .
5. AWWA, 2014. 2014 AWWA State of the Water Industry Report. .