Teichert Aggregates, a part of Teichert, is one of the largest, oldest aggregate producers in the United States. Its plants produce graded rock and sand products for various projects. The company maintains locations throughout northern California. Teichert Aggregates also conducts online customer service surveys. Founded in 1887, Teichert is a family-owned business that operates various subsidiaries, including Teichert Construction, Angelo Utilities and Teichert Materials. It additionally maintains a mobile equipment division. The company offers concrete precast products for underground utilities and infrastructure construction applications. Teichert also operates the Teichert Foundation. It uses technologies from Construction Industry Institute. The company also has undertaken projects for Thunder Valley Casino, Mountain House and Hewlett-Packard.