After a rise in Coronavirus cases, County Judge Lina Hidalgo issued an order that businesses require customers to wear masks. 

From ReadyHarris.org:

On Friday, June 19th, Harris County Judge Lina Hidalgo signed an order requiring businesses to generate, post, and implement health and safety policies which include, at a minimum, a requirement that workers, customers or visitors wear face coverings. The order takes effect at 12:01 am on Monday, June 22nd.

The order directs all commercial entities providing goods or services to require that all employees or visitors to a business premise wear face coverings in areas that involve any proximity to co-workers or the public. Face coverings may include homemade masks, scarfs, bandanas, or a handkerchief. Commercial entities must post the health and safety policy in a conspicuous location sufficient to provide notice to employees and visitors of all health and safety requirements.

To support the development of health and safety policies, Harris County is making available a sample health and safety policy and additional guidelines for businesses. Businesses that fail to develop, post, and implement a Health and Safety Policy are subject to a $1,000 for each violation.

A copy of the order may be found here.