The County of Santa Clara Public Health Department provides an overview of SARS-CoV-2 virus concentration in wastewater samples collected at wastewater treatment facilities that serve people in Santa Clara County.

Protocol of Sample Collection & Testing: Samples for testing consist of “settled solids” from wastewater entering each treatment plant. Samples are collected 7 days a week from the wastewater treatment plants and are transported daily to a commercial lab for analysis. Laboratory staff process the samples to quantify pieces of the SARS-CoV-2 viral genome in the wastewater. These procedures use methods to concentrate solids and extract RNA and detect viral RNA. Results are typically ready within 24 hours of sample drop-off and are uploaded to this page. The quick turnaround and posting are one of the major advantages of utilizing this data.

Interpretation of Plots: Data reflected in the table below shows the results for one SARS-CoV-2 gene (N gene), and the concentrations are “normalized” by the concentration of a plant virus that is harmless to humans but is shed in stool (pepper mild mottle virus, or PMMoV). Normalizing by PMMoV adjusts for changes in the amount of feces in the sample and the efficiency of the procedures from day to day.

Wastewater typically contains waste from a variety of sources, such as from your shower or a commercial process. These types of waste do not have stool (which is the source of SARS-CoV-2) so they dilute the sample. Therefore, we adjust this sample to the known amount of feces in the wastewater to get an accurate result.
The curves displayed are the “7-day trimmed average” of the sample results. This is done by using 7 consecutive samples, eliminating the maximum and minimum among the 7 samples, and then taking the mean. The smoothing is right aligned. Trends in wastewater have been shown to track trends in COVID incidence.

For more information, please visit dashboard view https://covid19.sccgov.org/dashboard-wastewater.

This table is updated Monday, Wednesday, and Fridays.

This dataset includes information on worksite outbreaks reported to the Santa Clara County Public Health Department. Data are updated as the County receives information that is more complete or accurate, therefore the number of outbreaks and information about each outbreak may change through this process. Please note that there is a lag in the data due to the time required for outbreaks to be investigated, closed, and the data processed.

This data table was updated for the last time on April 18, 2022

Cumulative COVID-19 positivity rate among county residents per 100 COVID-19 tests performed by census tract. Source: California Department of Public Health, California Reportable Disease Information Exchange (CalREDIE). Note: Data are not presented if the test count is between 1 to 10 and/or population size is less than 1000 in a census tract.

COVID-19 cumulative positivity rate by census tract is updated the first Tuesday of each month. This table was updated for the last time on January 24, 2023.

Cumulative COVID-19 case rate among county residents per 100,000 people residing in the census tract. Source: California Department of Public Health, California Reportable Disease Information Exchange (CalREDIE). Note: Data are not presented if the case count is between 1 to 10 and/or population size is less than 1000 in a census tract.

COVID-19 cumulative case rate by census tract is updated the first Tuesday of each month. This table was updated for the last time on January 24, 2023.

This table contains the daily 7-day average case rates for Santa Clara County residents by age and vaccination status as well as the 7-day average case counts and population estimates to calculate these rates. Residents are considered fully vaccinated two weeks after the final dose of the vaccine, and residents are considered unvaccinated if they have not received any doses of a COVID-19 vaccine. People who are partially vaccinated are not included in either category.

Counties are experiencing temporary fluctuations in vaccination data received from the State of California due to a data reconciliation process involving integration of vaccination data systems by the State. The data reconciliation process and associated fluctuations in county vaccination are expected to be resolved by mid-April 2022

Cumulative COVID-19 tests performed among county residents per 100,000 people residing in the census tract. Source: California Department of Public Health, California Reportable Disease Information Exchange (CalREDIE). Note: Data are not presented if the test count is between 1 to 10 and/or population size is less than 1000 in a census tract.

COVID-19 cumulative test rate by census tract is updated the first Tuesday of each month. This table was updated for the last time on January 24, 2023.

Percentage of county residents with completed COVID-19 vaccination by census tract of residence. Source: California Immunization Registry. Note: Number of people with completed vaccination is the number of county residents who either received a vaccine requiring a single dose or received the final dose of a vaccine requiring multiple doses. Percent of residents vaccinated and population age 5 years and older is based in part on estimates of the number of people residing in the census tract from a population-based survey sample, which is subject to error. As a result, percent vaccinated may be over- or under-estimated. For this reason, the displayed percent of residents vaccinated in a census tract is capped at 95%.

COVID-19 vaccination among county residents by census tract is updated every Tuesday. This table was updated for the last time on January 24, 2023.

This dataset aggregates SARS‑CoV‑2 test results for inmates at Elmwood and Main Jail. It includes nucleic acid amplification tests (e.g., PCR tests) and antigen tests collected by Santa Clara County Custody Health Services since 2020 up to yesterday. It does not include indeterminate results or invalid tests; as of December 2022, fewer than 0.015% of tests collected have reported indeterminate results, and fewer than 0.007% have been reported as invalid.

Percentage of county residents who are boosted with COVID-19 vaccines by census tract of residence. Source: California Immunization Registry. Note: Doses administered are categorized as a booster dose if the dose is a third dose administered six or more months after a second dose of Pfizer or Moderna or if the dose is a second dose administered two or more months after a dose of Janssen/Johnson & Johnson. Percent of residents who are boosted with COVID-19 vaccines and population age 12 years and older is based in part on estimates of the number of people residing in the census tract from a population-based survey sample, which is subject to error. As a result, percent vaccinated may be over- or under-estimated. For this reason, the displayed percent of residents vaccinated in a census tract is capped at 95%.

COVID-19 vaccination among county residents by census tract is updated every Tuesday. This table was updated for the last time on January 24, 2023.

This dataset aggregates inmate cases of COVID-19; it includes cases confirmed by nucleic acid amplification tests (e.g., PCR tests) collected internally (at Elmwood and Main Jail by Santa Clara County Custody Health Services) and externally (outside Elmwood and Main Jail).

The Office of the Sheriff updates this dataset weekdays, typically between 10:00 and 12:00 PM, after receiving a snapshot report from Custody Health Services at 06:00 AM, investigating custody statuses of inmates, and incorporating updates around the clock.

Because the case count includes cases confirmed by tests collected internally and externally, the case count may be greater than the positive test result count, which is based on tests collected by Custody Health Services only.