COVID-⁠19 Switzerland

Information on the current situation, as of 31 January 2023

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

Epidemiological course,Switzerland and Liechtenstein

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 participating 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/day) 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 prompt adjustments to data calculations.

The timeframe desired can be selected using the slider below the chart.

Geographical distribution

Viral load in wastewater, Switzerland and Liechtenstein, 07.02.2022 to 30.01.2023

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 32,2% 24,9
AG Aarburg AG Aarburg 30 884 63,3% 58,3
AG Baden AG Baden 59 560 16,3% 13,3
AG Bremgarten AG Bremgarten 22 613 19,1% 15,4
AG Brugg AG Brugg 46 250 41,3% 39,4
AG Kaisten AG Kaisten 25 354 0,9% -
AG Lenzburg AG Lenzburg 54 568 47,1% -
AG Reinach AG Reinach 23 817 1,0% -
AG Wohlen AG Wohlen 31 992 22,6% 19,5
AG Zofingen AG Zofingen 35 577 3,5% −8,7
AI Appenzell (Boedeli) AI Appenzell (Boedeli) 11 877 8,5% 3,0
AR Herisau (Bachwis) AR Herisau (Bachwis) 16 500 10,5% −6,5
BE Aarwangen (Zala) BE Aarwangen (Zala) 40 845 12,4% 0,7
BE Biel BE Biel 85 389 17,9% −4,3
BE Grindelwald BE Grindelwald 4153 2,1% −5,7
BE Interlaken BE Interlaken 27 945 11,3% −9,9
BE Laupen BE Laupen 62 000 4,4% 0,3
BE Lauterbrunnen BE Lauterbrunnen 2553 14,6% -
BE Lyss BE Lyss 36 358 15,4% 4,5
BE Mittl. Emmental BE Mittl. Emmental 25 733 5,2% 1,1
BE Moossee-Urtenenbach BE Moossee-Urtenenbach 33 844 12,3% 3,9
BE Region Bern BE Region Bern 224 557 1,2% −4,5
BE Saanen BE Saanen 9253 40,6% 30,3
BE Thunersee BE Thunersee 124 550 2,0% 0,9
BE Worblental BE Worblental 71 636 9,0% −10,4
BS Basel BS Basel 273 075 12,6% 8,5
FL Liechtenstein FL Liechtenstein 39 315 2,1% −6,1
FR Fribourg (Aele) FR Fribourg (Aele) 44 211 2,7% −0,3
FR Vuippens (Ais) FR Vuippens (Ais) 34 647 11,2% −19,4
GE Aire GE Aire 451 771 7,3% −0,7
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 14,7% 3,0
GR Arosa GR Arosa 2049 16,0% −6,7
GR Cazis (Waldau) GR Cazis (Waldau) 10 963 9,0% −6,3
GR Chur GR Chur 55 000 7,8% −1,5
GR Davos (Gadenstatt) GR Davos (Gadenstatt) 9706 6,2% −5,3
GR Klosters (Gulfia) GR Klosters (Gulfia) 3155 66,2% −22,0
GR Landquart GR Landquart 17 054 46,6% 21,8
GR Poschiavo (Li Geri) GR Poschiavo (Li Geri) 3358 80,3% 70,2
GR S-chanf (Oberengadin) GR S-chanf (Oberengadin) 15 056 23,1% 1,5
GR Schluein (Gruob) GR Schluein (Gruob) 7823 21,6% 9,3
GR Scuol (Sot Ruinas) GR Scuol (Sot Ruinas) 3473 45,6% 23,1
GR Seewis (Vorderes Prättigau) GR Seewis (Vorderes Prättigau) 8003 17,1% 10,9
JU Delemont (Sede) JU Delemont (Sede) 36 484 1,5% −1,3
JU Porrentruy (Sepe) JU Porrentruy (Sepe) 16 500 2,3% −1,7
LU Buholz (Real) LU Buholz (Real) 183 511 6,2% −3,6
LU Rontal LU Rontal 28 771 32,2% −44,6
NE Colombier (La Saunerie) NE Colombier (La Saunerie) 27 582 5,4% −31,3
NE La-Chaux-de-Fonds NE La-Chaux-de-Fonds 35 360 0,4% −16,0
NE Neuchatel NE Neuchatel 40 697 3,3% 0,1
NW Stans (Rotzwinkel) NW Stans (Rotzwinkel) 21 214 8,0% −4,7
OW Alpnach (Sarneraatal) OW Alpnach (Sarneraatal) 30 657 29,0% 6,9
OW Engelberg OW Engelberg 4053 18,1% −3,2
SG Altenrhein SG Altenrhein 64 000 8,1% 0,0
SG Au (Rosenbergsau) SG Au (Rosenbergsau) 41 281 5,9% −5,0
SG Bad Ragaz SG Bad Ragaz 12 007 6,8% −1,6
SG Buchs SG Buchs 24 844 2,7% −5,2
SG Flawil (Oberglatt) SG Flawil (Oberglatt) 30 378 6,6% −9,8
SG Flums (Seez) SG Flums (Seez) 12 448 0,7% −0,5
SG Rapperswil-Jona SG Rapperswil-Jona 28 168 1,2% −1,4
SG St.Gallen (Au) SG St.Gallen (Au) 37 876 4,0% −1,9
SG St.Gallen (Hofen) SG St.Gallen (Hofen) 57 031 13,8% 6,2
SG Steinach (Morgental) SG Steinach (Morgental) 30 710 5,4% −1,3
SG Wil SG Wil 26 295 4,9% −1,5
SH Hallau (Klettgau) SH Hallau (Klettgau) 14 795 6,6% −2,1
SH Neuhausen A/Rhf. (Roeti) SH Neuhausen A/Rhf. (Roeti) 56 967 10,0% 8,0
SH Ramsen (Bibertal-Hegau) SH Ramsen (Bibertal-Hegau) 100 338 6,4% −4,2
SO Grenchen (Buerenamt) SO Grenchen (Buerenamt) 46 563 8,5% −8,2
SO Winznau (Zv Olten) SO Winznau (Zv Olten) 54 540 8,1% −6,7
SO Zuchwil (Soloth.-Emme) SO Zuchwil (Soloth.-Emme) 95 793 3,7% 0,4
SZ Hoefe SZ Hoefe 29 624 35,4% 4,6
SZ Schwyz SZ Schwyz 31 164 8,4% −3,4
SZ Untermarch SZ Untermarch 29 470 18,7% −0,3
TG Frauenfeld TG Frauenfeld 36 369 3,9% 0,7
TG Hefenhofen (Aachtal, Moos) TG Hefenhofen (Aachtal, Moos) 23 074 4,9% −0,1
TG Weinfelden (Mittelthurgau) TG Weinfelden (Mittelthurgau) 31 342 22,8% 11,2
TI Bellinzona (Giubiasco) TI Bellinzona (Giubiasco) 53 209 55,2% 16,8
TI Chiasso (Vacallo) TI Chiasso (Vacallo) 26 638 19,6% 11,3
TI Locarno (Foce Maggia) TI Locarno (Foce Maggia) 50 781 15,3% 4,9
TI Locarno (Foce Ticino) TI Locarno (Foce Ticino) 24 516 56,4% −21,6
TI Lugano TI Lugano 124 000 12,8% 0,5
TI Mendrisio (Rancate) TI Mendrisio (Rancate) 29 392 79,3% 34,2
UR Altdorf UR Altdorf 33 940 8,3% −0,2
VD Commugny VD Commugny 22 575 38,2% −12,8
VD Gland (Apec) VD Gland (Apec) 36 034 44,7% 3,3
VD Lausanne (Vidy) VD Lausanne (Vidy) 247 824 3,3% −4,5
VD Montreux/Pierrier VD Montreux/Pierrier 41 383 31,8% −13,2
VD Morges VD Morges 39 126 29,7% 11,8
VD Nyon VD Nyon 25 753 17,3% -
VD Vevey (Aviron) VD Vevey (Aviron) 53 864 32,2% −2,2
VD Yverdon VD Yverdon 35 462 43,1% −11,1
VS Bagnes-Le Châble VS Bagnes-Le Châble 7713 9,4% −5,3
VS Brig-Glis (Briglina) VS Brig-Glis (Briglina) 28 678 3,5% −0,4
VS Goms VS Goms 4193 15,3% −7,8
VS Martigny VS Martigny 39 643 0,8% −0,8
VS Sierre/Noes VS Sierre/Noes 32 480 5,2% −1,9
VS Sion/Chateauneuf VS Sion/Chateauneuf 35 632 10,3% −7,6
VS Zermatt VS Zermatt 5507 33,3% −18,5
ZG Cham (Schoenau) ZG Cham (Schoenau) 146 942 2,4% −9,7
ZH Affoltern am Albis ZH Affoltern am Albis 30 226 25,3% −4,4
ZH Andelfingen ZH Andelfingen 7150 31,7% −13,5
ZH Bülach ZH Bülach 35 612 13,3% 7,3
ZH Dietikon (Limeco) ZH Dietikon (Limeco) 83 367 16,0% 2,8
ZH Dübendorf (Ika Neugut) ZH Dübendorf (Ika Neugut) 39 622 89,4% −6,4
ZH Horgen ZH Horgen 26 952 76,8% 16,4
ZH Illnau-Effretikon ZH Illnau-Effretikon 18 921 18,2% −12,7
ZH Meilen (Rorguet) ZH Meilen (Rorguet) 26 447 44,9% 1,3
ZH Niederglatt (Fischb.-Gl.) ZH Niederglatt (Fischb.-Gl.) 43 596 25,6% −2,7
ZH Uster (Jungholz) ZH Uster (Jungholz) 41 303 37,7% −8,7
ZH Werdhölzli ZH Werdhölzli 471 000 9,2% 1,1
ZH Wetzikon (Flos) ZH Wetzikon (Flos) 31 419 58,2% 18,4
ZH Winterthur ZH Winterthur 140 403 30,4% 14,6
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Source: FOPH – Status: 31.01.2023, 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

Viral load in wastewater, Switzerland and Liechtenstein, 07.02.2022 to 30.01.2023

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.
Winterthur, ZH Population coverage: 140 403
7-⁠⁠day average from 25.01.2023
Relative viral load 30,4%
Absolute viral load 1.4e+13
Difference to previous week 14,6pp
Measured
7-⁠⁠day average

Relative viral load

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covid19.admin.ch
Source: FOPH – Status: 31.01.2023, 08.00h