Error message

  • Notice: Undefined offset: 3 in user_node_load() (line 3697 of /homepages/18/d443224071/htdocs/modules/user/user.module).
  • Notice: Trying to get property 'name' of non-object in user_node_load() (line 3697 of /homepages/18/d443224071/htdocs/modules/user/user.module).
  • Notice: Undefined offset: 3 in user_node_load() (line 3698 of /homepages/18/d443224071/htdocs/modules/user/user.module).
  • Notice: Trying to get property 'picture' of non-object in user_node_load() (line 3698 of /homepages/18/d443224071/htdocs/modules/user/user.module).
  • Notice: Undefined offset: 3 in user_node_load() (line 3699 of /homepages/18/d443224071/htdocs/modules/user/user.module).
  • Notice: Trying to get property 'data' of non-object in user_node_load() (line 3699 of /homepages/18/d443224071/htdocs/modules/user/user.module).
  • Warning: A non-numeric value encountered in theme_pager() (line 329 of /homepages/18/d443224071/htdocs/includes/pager.inc).
  • Warning: A non-numeric value encountered in theme_pager() (line 335 of /homepages/18/d443224071/htdocs/includes/pager.inc).
  • Notice: Undefined offset: 3 in user_node_load() (line 3697 of /homepages/18/d443224071/htdocs/modules/user/user.module).
  • Notice: Trying to get property 'name' of non-object in user_node_load() (line 3697 of /homepages/18/d443224071/htdocs/modules/user/user.module).
  • Notice: Undefined offset: 3 in user_node_load() (line 3698 of /homepages/18/d443224071/htdocs/modules/user/user.module).
  • Notice: Trying to get property 'picture' of non-object in user_node_load() (line 3698 of /homepages/18/d443224071/htdocs/modules/user/user.module).
  • Notice: Undefined offset: 3 in user_node_load() (line 3699 of /homepages/18/d443224071/htdocs/modules/user/user.module).
  • Notice: Trying to get property 'data' of non-object in user_node_load() (line 3699 of /homepages/18/d443224071/htdocs/modules/user/user.module).

In Norway, cyanobacterial blooms occur frequently in lakes used for drinking water and recreational use. The associated toxins that have been detected are microcystins and anatoxin-a. About 88 % of the Norwegian population is served with drinking water produced from surface waters and it is obvious that cyanobacterial blooms in potable waters can pose a human health threat. Several eutrofic Norwegian lakes are monitored regularly. There is no national legislation on toxic cyanobacteria in Norway and the Norwegian drinking water regulations do not require water works to monitor cyanobacterial toxins in the raw water.