In addition to retrieving data stored in SFEI's Regional Data Center (RDC), you can access data uploaded to other California Environmental Data Exchange Network (CEDEN) RDCs.
The CD3 REST API is registered with the USEPA's Reusable Component Services.
Citation: Regional Monitoring Program for Water Quality in San Francisco Bay. Contaminant Data Display & Download (CD3). Accessed [date retrieved]. https://cd3.sfei.org.