1   Number of sewerage systems (treatment plants and direct discharges), divided on treatment method and county. 1999
  Total Chemical/
biological
Chemical Biological Mechanical Other treatment Direct discharges
Whole country (01-20) 3 415 323 251 125 1 634 538 544
North Sea counties (01-10) 921 246 202 27 70 373 3
Other counties (11-20) 2 494 77 49 98 1 564 165 541
               
01 Østfold 57 24 12 3 8 9 1
02/03 Oslo og Akershus 60 21 29 2 - 8 -
04 Hedmark 132 39 26 2 - 65 -
05 Oppland 218 76 21 - 6 115 -
06 Buskerud 190 23 46 1 6 114 -
07 Vestfold 34 20 10 - 2 2 -
08 Telemark 108 18 30 12 9 39 -
09 Aust-Agder 50 11 16 2 12 9 -
10 Vest-Agder 72 14 12 5 27 12 2
11 Rogaland 289 3 15 10 232 23 6
12 Hordaland 359 16 5 10 290 13 25
14 Sogn og Fjordane 228 7 3 9 134 30 45
15 Møre og Romsdal 551 2 1 4 288 16 240
16 Sør-Trøndelag 124 15 6 18 56 21 8
17 Nord-Trøndelag 168 21 9 25 94 15 4
18 Nordland 434 3 6 15 343 29 38
19 Troms 171 5 2 6 87 7 64
20 Finnmark 170 5 2 1 40 11 111
Source: Waste water treatment statistics, Statistics Norway.

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