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COVID-19 Information for Hays County Residents

COVID-19 Information for Hays County Residents

This page is periodically updated with new and changing information. Last update:  August 14, 2023

Visit the Hays County Health Department Webpage

COVID-19 Dashboard

Hays County COVID-19 statistics are published on a weekly basis here.

Hays County Local Health Department (HCLHD) often receives COVID-19 case information days, weeks or months after the fact. This is the result of data reporting lags from a variety of sources including medical care providers, hospitals, labs, and other health departments. Discrepancies in the cumulative counts are the result of these data backlogs as well as ongoing data verification.

COVID-19 Quarantine and Isolation Guidelines

Current Quarantine and Isolation Guidelines.

Report at-home COVID-19 Test Results

Report COVID-19 home test results here. All information is confidential and no identifying information is collected. Home test results are not included in the official case counts—they are used to increase our understanding of community spread.

COVID-19 Testing Information

Most local medical facilities offer COVID-19 testing. Insurance or out-of-pocket costs may apply. Call ahead to confirm.

COVID-19 Vaccine Information

Use this website to find a vaccination clinic near you.

Walk-in vaccine appointments are available every morning from 8-11 a.m. at the Christus Trinity Clinic located at 401A Broadway St in San Marcos. Please note, there is a fee for these vaccines.

Improving Indoor Air Quality

The most common way that COVID-19 is transmitted is through tiny airborne particles of the virus. People who are infected release these particles into the air when they exhale (breathing, speaking, coughing, etc.). The aerosol particles can spread throughout a large room and linger in the air for hours. Because most people spend approximately 90% of their lives indoors, improving the quality of indoor air reduces the spread of respiratory viruses and improves overall health.

Three ways to improve indoor air:

1) Increase air flow (ventilation)

  • Open windows and doors to increase the flow of outdoor air into the building.
  • Increase the amount of outdoor air that is pulled in by the Heating, Ventilation, and Cooling (HVAC) system to 100%.

 2) Clean indoor air (filtration)

  • Filter viruses and other pollutants out of indoor air.
  • If possible, use high-efficiency filters in your HVAC system (MERV 13 or higher). You may need to have your system evaluated by a specialist to determine if your system can handle the high-efficiency filters.
  • Use portable HEPA air filters.
  • A lower cost option is to make a DIY air filter with a box fan and 4 MERV 13 air filters (Corsi-Rosenthal box).

3) Kill germs in the air using upper room ultraviolet germicidal irradiation

  • Ultraviolet Germicidal Irradiation (UVGI) systems can kill germs in the air but do not remove the pollutants. They should be used in addition to improvements in ventilation and filtration.
  • UVGI is only intended for specific spaces and not for inside homes. Work with a specialist to see if it will work for your space.

How do you know if your indoor space has adequate ventilation?

One way to test for adequate ventilation is to monitor CO2 levels. We exhale CO2 when we breathe. When people enter a room, the CO2 levels will rise for the first 20 or 30 minutes and then stabilize. If CO2 levels continue to rise after this time, it means that the room is inadequately ventilated, and action to increase airflow should be taken. The CO2 itself is not dangerous (unless it is at extremely high levels); measuring the CO2 levels is a proxy for overall ventilation.

Hays County Local Health Department has CO2 monitors available for local businesses, schools, etc. to check out for 2-3 days at a time. If you are interested in assessing the ventilation in your indoor space, please contact for more information.

Improving indoor air quality resources:

Clean Air in Buildings Challenge

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