Town data Health

Wastewater virus levels, Chico sewer plant

Latest sample from Chico's sewer plant (October 19, 2026). 3.2x COVID-19 level, last three samples vs the two-year median.

Virus levels measured in raw sewage at the City of Chico Water Pollution Control Plant, which serves about 101,000 people. Rising levels usually show up here before they show up in clinics.

Up to dateUpdated (3 h ago)Refreshed daily check (samples about twice a week, posted a week later)Source

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2026-10-19latest sample from Chico's sewer plant
3.2xCOVID-19 level, last three samples vs the two-year median
2.1xflu A level, last three samples vs the two-year median
not detectedRSV in the last three samples

The records 250 of 287

Sample dateCOVID-19 (copies/L)Flu A (copies/L)RSV (copies/L)Mpox (copies/L)H5 bird flu
Oct 19, 2026184,9363,34400not detected
Oct 14, 2026204,7234,16400not detected
Oct 13, 2026290,2585,21100not detected
Oct 12, 2026163,6984,59600not detected
Oct 7, 2026301,34425,68200not detected
Oct 6, 2026331,87012,06000not detected
Oct 5, 2026162,3345,93400not detected
Sep 30, 2026389,1474,72500not detected
Sep 29, 2026376,8484,83100not detected
Sep 28, 2026198,5107,72700not detected
Sep 23, 2026194,9239,86700not detected
Sep 22, 2026215,7054,09600not detected
Sep 21, 2026147,3541,82200not detected
Sep 16, 2026307,1352,74400not detected
Sep 15, 2026197,8426,27700not detected
Sep 14, 2026280,031000not detected
Sep 9, 2026442,6813,98000not detected
Sep 8, 2026364,7063,03500not detected
Sep 2, 2026479,720000not detected
Sep 1, 2026958,0444,74600not detected
Aug 31, 2026294,8663,26500not detected
Aug 26, 2026343,3933,96400not detected
Aug 25, 2026227,0631,72200not detected
Aug 24, 2026217,484000not detected
Aug 19, 2026135,974000not detected
Aug 18, 2026144,168000not detected
Aug 17, 2026151,426000not detected
Aug 12, 2026161,077000not detected
Aug 11, 2026170,984000not detected
Aug 10, 2026120,565000not detected
Aug 5, 202697,405000not detected
Aug 4, 202632,369000not detected
Aug 3, 202636,201000not detected
Jul 29, 202638,648000not detected
Jul 28, 202682,381000not detected
Jul 22, 202645,997000not detected
Jul 21, 202643,746000not detected
Jul 20, 202648,485000not detected
Jul 15, 2026114,987000not detected
Jul 14, 20269,204000not detected
Jul 13, 202618,588000not detected
Jul 8, 202631,372000not detected
Jul 7, 202640,497000not detected
Jul 6, 202637,991000not detected
Jun 30, 202648,8112,6921,7860not detected
Jun 29, 202626,8363,33500not detected
Jun 24, 202634,739000not detected
Jun 23, 202612,376000not detected
Jun 22, 20263,816000not detected
Jun 17, 202612,75301,9920not detected
Jun 16, 202621,160000not detected
Jun 15, 202632,209000not detected
Jun 10, 202612,499000not detected
Jun 9, 20268,68302,4000not detected
Jun 8, 202610,3152,3193,7290not detected
Jun 3, 20267,29403,2170not detected
Jun 2, 20269,389000not detected
Jun 1, 202616,03606,3660not detected
May 27, 20263,220000not detected
May 26, 20264,57002,7310not detected
May 25, 202612,018000not detected
May 20, 20262,65801,5790not detected
May 19, 20265,09504,3920not detected
May 18, 20266,427010,9490not detected
May 13, 20269,55901,8760not detected
May 12, 202610,7461,7406,0080not detected
May 11, 20262,077000not detected
May 6, 202612,905000not detected
May 5, 202616,569000not detected
May 4, 202637,226000not detected
Apr 29, 202642,44502,5730not detected
Apr 28, 202634,2331,52518,8260not detected
Apr 27, 202624,68102,4260not detected
Apr 22, 202614,67803,4280not detected
Apr 21, 202613,5331,7512,2160not detected
Apr 20, 202646,81703,0070not detected
Apr 15, 20266,9742,1897,8130not detected
Apr 14, 202618,40704,4220not detected
Apr 13, 202611,8136,4047,8180not detected
Apr 8, 202615,2551,9959,2450not detected
Apr 7, 202623,3438,48611,9110not detected
Apr 6, 202615,0856,30814,4570not detected
Apr 1, 202618,0021,80920,5890not detected
Mar 31, 20266,8682,26924,2820not detected
Mar 30, 20267,5082,59417,2910not detected
Mar 25, 20268,0982,20433,1230not detected
Mar 24, 202612,344016,3020not detected
Mar 23, 20264,2954,75135,9650not detected
Mar 18, 20265,53210,05235,8370not detected
Mar 17, 202612,4985,16827,5880not detected
Mar 16, 202610,1349,18478,7960not detected
Mar 11, 202618,9503,84222,6750not detected
Mar 10, 20264,0379,90226,6170not detected
Mar 9, 202612,24910,274111,4750not detected
Mar 4, 202656,73711,35149,3160not detected
Mar 3, 202648,4193,09187,8580not detected
Mar 2, 202652,71111,058166,6610not detected
Feb 25, 202630,91843,05154,7400not detected
Feb 24, 202656,81613,68440,9600not detected
Feb 23, 202623,60013,31055,2410not detected
Feb 18, 202642,30486,18741,1620not detected
Feb 17, 202673,55666,51646,3740not detected
Feb 11, 202664,489140,02032,2370not detected
Feb 10, 2026122,982259,81969,2690not detected
Feb 9, 202653,648141,48639,9210not detected
Feb 4, 2026117,500218,72050,0650not detected
Feb 3, 202657,043164,78659,3060not detected
Feb 2, 202679,768127,19651,6220not detected
Jan 28, 2026119,543191,05729,3200not detected
Jan 27, 202657,860123,88057,5440not detected
Jan 26, 202624,022120,80936,2290not detected
Jan 21, 2026110,02168,51333,7600not detected
Jan 20, 202674,992112,71939,0150not detected
Jan 14, 202621,37153,79211,2110not detected
Jan 13, 202634,65244,03919,9450not detected
Jan 12, 202622,54414,647160,8240not detected
Jan 7, 202610,08531,16216,9450not detected
Jan 6, 20267,13119,6914,1460not detected
Jan 5, 202618,29253,65815,5470not detected
Dec 29, 202551,83830,30214,2750not detected
Dec 17, 202526,73230,3098,7490not detected
Dec 16, 202532,52335,4813,1430not detected
Dec 15, 2025195,84319,03238,6610not detected
Dec 10, 202570,7813,78300not detected
Dec 9, 202570,2661,6142,4340not detected
Dec 8, 202516,5111,6513,7900not detected
Dec 3, 202528,694000not detected
Dec 2, 202530,3576,4122,1370not detected
Dec 1, 202554,66104,3210not detected
Nov 24, 202530,72703,1010not detected
Nov 23, 202540,08608,4690not detected
Nov 19, 202533,4661,66800not detected
Nov 18, 202543,7385,52800not detected
Nov 17, 202516,1611,74500not detected
Nov 12, 202522,437000not detected
Nov 5, 202546,704000not detected
Nov 4, 202547,412000not detected
Nov 3, 202521,91103,0050not detected
Oct 29, 202553,766000not detected
Oct 28, 202553,958000not detected
Oct 27, 2025102,703000not detected
Oct 22, 202597,4029,9802,1130not detected
Oct 21, 202599,538000not detected
Oct 20, 202552,302000not detected
Oct 15, 202585,518000not detected
Oct 14, 202592,441000not detected
Oct 13, 202549,446000not detected
Oct 8, 202592,756000not detected
Oct 7, 2025123,493000not detected
Oct 6, 202587,264000not detected
Oct 1, 2025138,8561,61000not detected
Sep 30, 2025138,223000not detected
Sep 29, 2025220,2992,83000not detected
Sep 24, 2025140,191000not detected
Sep 23, 2025152,2061,82800not detected
Sep 22, 2025357,418000not detected
Sep 17, 2025220,309000not detected
Sep 16, 2025324,466000not detected
Sep 15, 2025261,809000not detected
Sep 10, 2025249,169000not detected
Sep 9, 2025548,5422,31000not detected
Sep 8, 2025427,581000not detected
Sep 3, 2025968,488000not detected
Sep 2, 2025504,594000not detected
Aug 27, 2025389,333000not detected
Aug 26, 2025352,952000not detected
Aug 25, 2025291,942000not detected
Aug 20, 2025257,437000not detected
Aug 19, 2025280,547000not detected
Aug 18, 202568,507000not detected
Aug 13, 20251,152,230000not detected
Aug 12, 2025167,969000not detected
Aug 11, 2025144,499000not detected
Aug 6, 2025187,462000not detected
Aug 5, 2025377,829000not detected
Aug 4, 2025172,900000not detected
Jul 30, 2025327,115000not detected
Jul 28, 202580,503000not detected
Jul 23, 2025154,604000not detected
Jul 22, 2025217,76202,2620not detected
Jul 21, 202590,70102,1270not detected
Jul 16, 2025291,737000not detected
Jul 15, 2025329,713000not detected
Jul 14, 2025181,898020,0680not detected
Jul 9, 20251,028,770000not detected
Jul 8, 2025252,2442,26900not detected
Jul 7, 2025214,7922,20100not detected
Jul 1, 202583,415000not detected
Jun 30, 2025153,131000not detected
Jun 25, 2025155,459000not detected
Jun 24, 2025238,793000not detected
Jun 23, 2025107,716000not detected
Jun 18, 2025110,290000not detected
Jun 17, 2025102,434000not detected
Jun 16, 2025170,923000not detected
Jun 11, 202584,925010,1880not detected
Jun 10, 202545,04308,0950not detected
Jun 9, 202579,4471,72000not detected
Jun 4, 2025101,6151,68900not detected
Jun 3, 202558,437000not detected
Jun 2, 2025164,9812,28800not detected
May 28, 2025179,385000not detected
May 27, 2025103,0002,0555,1270not detected
May 21, 2025181,8212,01000not detected
May 20, 2025177,902000not detected
May 19, 202599,450000not detected
May 14, 202583,0393,81700not detected
May 13, 2025184,17702,1400not detected
May 12, 2025126,405000not detected
May 7, 2025128,0811,7821,7680not detected
May 6, 2025149,55503,5110not detected
May 5, 202544,705000not detected
Apr 30, 202578,4623,16000not detected
Apr 29, 202575,85302,5900not detected
Apr 28, 202550,465000not detected
Apr 23, 202575,0502,0816,2390not detected
Apr 22, 2025135,1561,53218,8850not detected
Apr 21, 202566,0243,60618,4960not detected
Apr 16, 202540,20902,2100not detected
Apr 15, 202576,32407,3570not detected
Apr 14, 202575,36105,8130not detected
Apr 9, 202538,974000not detected
Apr 8, 202578,2581,57400not detected
Apr 7, 2025143,74509,4514,594not detected
Apr 2, 202592,6402,35012,9990not detected
Apr 1, 202568,1962,92717,6640not detected
Mar 31, 202555,1093,2235,8370not detected
Mar 26, 2025254,4923,33532,6210not detected
Mar 25, 202597,6464,54737,4480not detected
Mar 24, 202558,62810,23633,3280not detected
Mar 19, 202552,1872,65948,4820not detected
Mar 18, 202525,47218,75455,3830not detected
Mar 17, 202540,76220,37229,5400not detected
Mar 12, 202525,4607,9188,5180not detected
Mar 11, 202571,3109,570204,6370not detected
Mar 10, 202566,9947,41638,1770not detected
Mar 5, 202563,05727,99486,4510not detected
Mar 4, 202577,22416,73949,7560not detected
Mar 3, 202570,38642,53165,3020not detected
Feb 26, 202522,96425,782105,2170not detected
Feb 25, 202552,81247,35492,8840not detected
Feb 24, 20258,11228,51342,6390not detected
Feb 23, 202527,49736,54790,3130not detected
Feb 19, 202564,09818,91526,7210not detected
Feb 18, 202578,32051,33343,5350not detected
Feb 12, 202542,25458,65362,0420not detected
Feb 11, 202528,77442,51735,7780not detected
Feb 10, 202510,11111,4484,4080not detected
Feb 5, 2025169,03575,21563,0120not detected
Feb 4, 202543,564127,78543,0060not detected

Concentrations are copies of viral genetic material per liter of wastewater, as reported by the CDPH lab; 0 means below the detection limit. Day-to-day values are noisy: look at the trend over several samples. H5 in sewage can come from animal sources such as milk or birds, not only from people.