Select laboratory network Air and indoor environment 35 Human biomonitoring 101 Water 42 Water 42 Filter Reset filters Type of laboratory External laboratory 2 Substance group Metals and trace elements 2 Other chemicals 1 Matrix Surface water 39 Drinking/Tap water 32 Ground water 27 Treated sewage/outlet 17 Mineral/Spring water 16 Untreated sewage/inlet 14 Saline/Marine water 10 Leachate 8 Industrial effluent outlet 8 Regenerated water 7 Process water 6 Recreational water 6 Healthcare water 4 (-) Other water 2