ONAS figures are made up annually at the end of April











 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2009

2008

2007

2006

2005

2003

1997

Indicators

160

157
157
155
155
146
117

Number of municipalities in O.N.A.S. action zone

6.2
6.1
6.0
5.9
5.8
5.5
4.7

Number of inhabitants in the municipalities in O.N.A.S. action zone  in million inhabitants 

5.5
5.3
5.2
5.1
5.0
4.6
3.7

Number of inhabitants connected to O.N.A.S. sewerage network in million inhabitants 

88,7%
87,6%
86,8%
86,6%
%86
%84
%78

Rate of connection to the public sewerage network in the municipalities in O.N.A.S. action zone

1502
1438
1382
1322
1270
1131
713

Number of subscribers in thousand subscribers

14503
14147
13839
13514
12711
11425
7700

Length of the network in km

106
100
98
95
83
70
52

- Number of wastewater treatment plants

256
250
234.9
226.7
219
193
152

Quantity of water consumed by O.N.A.S. subscribers in million m3

238
230
225.5
215.6
201
188
123

Quantity of wastewater treated at the WWTPs** for O.N.A.S. subscribers in million m3 

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