COVID-⁠19 Switzerland

Information on the current situation, as of 27 September 2022

The key figures will be published each Tuesday at 15:30.

Epidemiological course,Appenzell Innerrhoden

Viral load in wastewater

The data published here are based on information obtained from the federal government's national wastewater monitoring system. Since January 2022, the national wastewater monitoring system of Switzerland and the Principality of Liechtenstein has determined the SARS-⁠CoV-⁠2 viral load in the wastewater of 110 wastewater treatment plants (WWTP) at regular intervals.

Wastewater samples are collected from wastewater treatment plants three to six times per week. The absolute viral load (gene copies/day) is specified per 100,000 inhabitants. A dilution factor based on the wastewater treatment plant's flow volume is taken into account, for instance during dry periods. The relative viral load is the measured viral load (gene copies/litre) as a proportion of the historically measured maximum value. The proportion of relative viral load is calculated by dividing the proportion of absolute viral load by the proportion of the historic maximum viral load value. The residential population comprises the catchment area of each wastewater treatment plant (WWTP). Seasonal fluctuations in the non-⁠permanent population, which influence the viral load particularly in busy tourist areas, are not included. Wastewater treatment plants (WWTP) no longer participating in the project will not be included when calculating the proportion of viral load per category. However, historical measurements will still be available when viewing the development over time.

Detailed information on the measuring methods and terminology can be found on the Eawag website. New findings may lead to changes in the calculation of the data.

Geographical distribution

Viral load in wastewater, Appenzell Innerrhoden, 07.02.2022 to 26.09.2022

The graph shows the relative viral load in per cent as a 7-⁠day average in the wastewater treatment plants (WWTPs) and the difference in viral load compared with the previous week in percentage points (pp) in Switzerland and Liechtenstein. The percentage point figure is used to compare percentages. The 7-⁠day relative share refers to the historical maximum values for each wastewater treatment plant.
Cant. Name Population coverage Relative viral load Difference to previous week
AG Aarau AG Aarau 78 255 9,2% −2,1
AG Aarburg AG Aarburg 30 884 36,5% 30,4
AG Baden AG Baden 59 560 11,5% 9,3
AG Bremgarten AG Bremgarten 22 613 3,3% −6,0
AG Brugg AG Brugg 46 250 7,7% -
AG Kaisten AG Kaisten 25 354 5,5% -
AG Lenzburg AG Lenzburg 54 568 10,7% 8,7
AG Reinach AG Reinach 23 817 1,0% -
AG Wohlen AG Wohlen 31 992 5,2% -
AG Zofingen AG Zofingen 35 577 2,4% -
AI Appenzell (Boedeli) AI Appenzell (Boedeli) 11 877 4,8% −1,3
AR Herisau (Bachwis) AR Herisau (Bachwis) 16 500 43,5% 20,2
BE Aarwangen (Zala) BE Aarwangen (Zala) 40 845 18,5% 3,5
BE Biel BE Biel 85 389 29,8% 12,9
BE Grindelwald BE Grindelwald 4153 50,4% 18,0
BE Interlaken BE Interlaken 27 945 38,7% -
BE Laupen BE Laupen 62 000 16,5% 3,1
BE Lauterbrunnen BE Lauterbrunnen 2553 31,0% −29,7
BE Lyss BE Lyss 36 358 26,0% 11,9
BE Mittl. Emmental BE Mittl. Emmental 25 733 13,7% 6,9
BE Moossee-Urtenenbach BE Moossee-Urtenenbach 33 844 5,7% −4,3
BE Region Bern BE Region Bern 224 557 22,9% 6,3
BE Saanen BE Saanen 9253 29,5% −6,1
BE Thunersee BE Thunersee 124 550 34,9% 21,3
BE Worblental BE Worblental 71 636 20,6% 3,1
BS Basel BS Basel 273 075 25,2% 0,2
FL Liechtenstein FL Liechtenstein 39 315 11,7% 5,6
FR Fribourg (Aele) FR Fribourg (Aele) 44 211 7,9% −52,6
FR Vuippens (Ais) FR Vuippens (Ais) 34 647 15,2% −9,5
GE Aire GE Aire 451 771 19,6% 2,3
GE Satigny/Bois-de-Bay GE Satigny/Bois-de-Bay 79 577 19,5% 7,6
GE Thonex/Villette GE Thonex/Villette 51 028 9,2% 5,2
GL Glarnerland GL Glarnerland 49 644 13,9% 8,3
GR Arosa GR Arosa 2049 3,5% 1,7
GR Cazis (Waldau) GR Cazis (Waldau) 10 963 2,7% 0,8
GR Chur GR Chur 55 000 17,5% 6,4
GR Davos (Gadenstatt) GR Davos (Gadenstatt) 9706 10,1% 4,6
GR Klosters (Gulfia) GR Klosters (Gulfia) 3155 11,2% 7,8
GR Landquart GR Landquart 17 054 9,4% 2,8
GR Poschiavo (Li Geri) GR Poschiavo (Li Geri) 3358 16,7% −0,8
GR S-chanf (Oberengadin) GR S-chanf (Oberengadin) 15 056 17,4% 4,0
GR Schluein (Gruob) GR Schluein (Gruob) 7823 8,7% −1,9
GR Scuol (Sot Ruinas) GR Scuol (Sot Ruinas) 3473 18,0% 11,0
GR Seewis (Vorderes Prättigau) GR Seewis (Vorderes Prättigau) 8003 5,3% −0,8
JU Delemont (Sede) JU Delemont (Sede) 36 484 24,1% 7,4
JU Porrentruy (Sepe) JU Porrentruy (Sepe) 16 500 60,7% −10,6
LU Buholz (Real) LU Buholz (Real) 183 511 24,1% 3,1
LU Rontal LU Rontal 28 771 15,7% −5,7
NE Colombier (La Saunerie) NE Colombier (La Saunerie) 27 582 10,2% −9,0
NE La-Chaux-de-Fonds NE La-Chaux-de-Fonds 35 360 1,9% 0,0
NE Neuchatel NE Neuchatel 40 697 13,8% −3,6
NW Stans (Rotzwinkel) NW Stans (Rotzwinkel) 21 214 23,7% 10,7
OW Alpnach (Sarneraatal) OW Alpnach (Sarneraatal) 30 657 15,5% −23,8
OW Engelberg OW Engelberg 4053 12,3% 6,0
SG Altenrhein SG Altenrhein 64 000 16,0% −7,9
SG Au (Rosenbergsau) SG Au (Rosenbergsau) 41 281 34,3% 18,3
SG Bad Ragaz SG Bad Ragaz 12 007 21,4% 12,6
SG Buchs SG Buchs 24 844 14,0% 3,5
SG Flawil (Oberglatt) SG Flawil (Oberglatt) 30 378 18,1% 7,2
SG Flums (Seez) SG Flums (Seez) 12 448 7,9% 0,6
SG Rapperswil-Jona SG Rapperswil-Jona 28 168 24,9% 13,8
SG St.Gallen (Au) SG St.Gallen (Au) 37 876 8,7% −0,3
SG St.Gallen (Hofen) SG St.Gallen (Hofen) 57 031 18,9% 3,6
SG Steinach (Morgental) SG Steinach (Morgental) 30 710 27,9% 18,5
SG Wil SG Wil 26 295 15,8% 9,8
SH Hallau (Klettgau) SH Hallau (Klettgau) 14 795 9,2% 7,5
SH Neuhausen A/Rhf. (Roeti) SH Neuhausen A/Rhf. (Roeti) 56 967 7,3% 2,8
SH Ramsen (Bibertal-Hegau) SH Ramsen (Bibertal-Hegau) 100 338 12,9% 9,6
SO Grenchen (Buerenamt) SO Grenchen (Buerenamt) 46 563 28,7% 0,6
SO Winznau (Zv Olten) SO Winznau (Zv Olten) 54 540 12,0% 3,3
SO Zuchwil (Soloth.-Emme) SO Zuchwil (Soloth.-Emme) 95 793 25,2% 0,9
SZ Hoefe SZ Hoefe 29 624 23,4% 9,8
SZ Schwyz SZ Schwyz 31 164 10,4% −4,8
SZ Untermarch SZ Untermarch 29 470 5,0% 0,5
TG Frauenfeld TG Frauenfeld 36 369 27,8% 13,0
TG Hefenhofen (Aachtal, Moos) TG Hefenhofen (Aachtal, Moos) 23 074 9,8% 6,6
TG Weinfelden (Mittelthurgau) TG Weinfelden (Mittelthurgau) 31 342 47,3% 29,0
TI Bellinzona (Giubiasco) TI Bellinzona (Giubiasco) 53 209 9,7% −0,1
TI Chiasso (Vacallo) TI Chiasso (Vacallo) 26 638 8,3% −9,8
TI Locarno (Foce Maggia) TI Locarno (Foce Maggia) 50 781 6,9% −29,4
TI Locarno (Foce Ticino) TI Locarno (Foce Ticino) 24 516 18,2% −3,4
TI Lugano TI Lugano 124 000 21,4% 1,8
TI Mendrisio (Rancate) TI Mendrisio (Rancate) 29 392 12,9% −7,8
UR Altdorf UR Altdorf 33 940 20,5% 3,0
VD Commugny VD Commugny 22 575 51,0% 29,7
VD Gland (Apec) VD Gland (Apec) 36 034 40,5% 19,2
VD Lausanne (Vidy) VD Lausanne (Vidy) 247 824 39,3% 17,5
VD Montreux/Pierrier VD Montreux/Pierrier 41 383 53,9% 16,4
VD Morges VD Morges 39 126 19,0% 2,4
VD Nyon VD Nyon 25 753 17,3% -
VD Vevey (Aviron) VD Vevey (Aviron) 53 864 35,9% 2,6
VD Yverdon VD Yverdon 35 462 51,7% 10,5
VS Bagnes-Le Châble VS Bagnes-Le Châble 7713 33,5% -
VS Brig-Glis (Briglina) VS Brig-Glis (Briglina) 28 678 100,0% 63,1
VS Goms VS Goms 4193 44,6% 21,8
VS Martigny VS Martigny 39 643 100,0% 29,4
VS Sierre/Noes VS Sierre/Noes 32 480 91,0% 60,9
VS Sion/Chateauneuf VS Sion/Chateauneuf 35 632 16,9% 3,5
VS Zermatt VS Zermatt 5507 75,4% 15,1
ZG Cham (Schoenau) ZG Cham (Schoenau) 146 942 13,2% −11,5
ZH Affoltern am Albis ZH Affoltern am Albis 30 226 24,5% 13,6
ZH Andelfingen ZH Andelfingen 7150 30,0% 16,8
ZH Bülach ZH Bülach 35 612 36,9% 20,6
ZH Dietikon (Limeco) ZH Dietikon (Limeco) 83 367 32,6% 23,9
ZH Dübendorf (Ika Neugut) ZH Dübendorf (Ika Neugut) 39 622 30,4% 4,6
ZH Horgen ZH Horgen 26 952 35,3% −2,4
ZH Illnau-Effretikon ZH Illnau-Effretikon 18 921 20,9% 8,1
ZH Meilen (Rorguet) ZH Meilen (Rorguet) 26 447 37,4% 16,0
ZH Niederglatt (Fischb.-Gl.) ZH Niederglatt (Fischb.-Gl.) 43 596 19,0% 4,9
ZH Uster (Jungholz) ZH Uster (Jungholz) 41 303 39,2% 23,2
ZH Werdhölzli ZH Werdhölzli 471 000 13,7% −2,7
ZH Wetzikon (Flos) ZH Wetzikon (Flos) 31 419 26,5% 4,8
ZH Winterthur ZH Winterthur 140 403 50,3% 4,1
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Source: FOPH – Status: 27.09.2022, 08.00h
Geographic distribution over time

View the development of the virus load in wastewater at various WWTPs in Switzerland and Liechtenstein.

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Development over time

The figure shows the 7-⁠day average absolute and relative viral load in percent in the wastewater treatment plants (WWTP) and the difference from the previous week's 7-⁠day average in percentage points (pp) in Switzerland and Liechtenstein. The relative proportion per 7-⁠day period refers to the historically measured maximum value per wastewater treatment plant.

Data only available for individual WWTP
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