Central Contra Costa Sanitary District (Central San) Externship Program

Our Spring 2021 Virtual Externship Program will be a five-day event from March 29 to April 2, held online from 10 a.m. to 2 p.m. PST every day, including a one-hour lunch break. Each of the five sessions will be an engaging and interactive introduction to our various departments and what types of careers our agency (exemplifying a public sector employer and wastewater treatment plant) can provide. Our staff will take you through a day in their lives, how they came to Central San, and what they enjoy about their jobs. Throughout the week, you will get to know all our departments - from administration, to engineering, to our plant operations - in a convenient and fun atmosphere with your peers from across the country. For more information, please visit https://www.centralsan.org/post/externship-program 

Central Contra Costa Sanitary District (Central San) is a local government agency founded in 1946. Our core service is providing wastewater treatment and collection to nearly 500,000 residents and over 3,000 businesses in Contra Costa County, about 30 miles northeast of San Francisco. In addition, we also operate a collection facility for household hazardous waste (such as batteries, paint, and fluorescent lights) and distribute recycled water. We have about 270 employees, all of whom are proud of our mission to protect public health and the environment. 

Central San is responsible for protecting the health of the public and the environment. We are committed to being good neighbors, using technology to increase quality and create efficiency, and providing a safe place for employees to work. Our mission is simply stated, but our means of accomplishing it is quite complex. 

We have a long-standing internship, co-op, and summer student program where we’ve given hands-on experiences to college students (many of whom have come back to work for us). This spring, Central San is also hosting a *virtual* week-long externship program for students from colleges and universities all over the country. Our cohort-style learning experience is designed as an insider look at multiple career paths in the wastewater industry and an opportunity to make connections, not only with established staff at Central San but also with fellow externs. The program is highly customizable and can go over any specific careers or departments the externs might be interested in. 

The location is usually REMOTE (MARTINEZ, CALIFORNIA).

To apply for an externship, visit:


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