U.S. EPA has released a database called ToxRefDB, which allows users to search and download thousands of toxicity testing results on hundreds of chemicals. The database captures 30 years and $2 billion of testing results.
ToxRefDB provides detailed chemical toxicity data in an accessible format. It is a part of ACToR (Aggregated Computational Toxicology Resource), an online data warehouse that collects data from about 500 public sources on tens of thousands of environmentally relevant chemicals. Specific chemicals can be queried to find all available public hazards, exposure and risk-assessment data, as well as previously unpublished studies related to cancer, reproductive, and developmental toxicity.