Externship Program


Central Contra Costa Sanitary District (Central San) has had 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). Central San now hosts an 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.


Central San will not be holding a Fall 2021 Externship Program, but we do hope to host a cohort of externs in person for live job shadowing and tours of our facilities this spring. Please send an email to externships@centralsan.org to be added to our electronic mailing list and be notified when we announce our Spring 2022 Externship Program. 


  • An extern must be currently enrolled in an accredited school, college, university, vocational or technical school. All academic standings and majors are welcome. Students who are not currently enrolled may also qualify to be an extern if they have graduated from college within the last year. Interested high school students may also apply.
  • Externs are considered “at-will,” short-term, non-continuous visitors with no grievance rights, benefits, or guarantees of regular employment with the District.


This externship is an unpaid position. Students are responsible for all expenses related to the externship, including travel (none needed for the virtual session), accommodations (if any), meals where not specified, etc.


A career in wastewater is a rewarding and challenging path that not everyone may consider. We offer jobs for a range of majors and fields of study. Check us out and see if there might be a place you’ll fit in – whether at Central San or somewhere else in the wastewater community!


Not sure if there’s a nexus between your field of study and what we’ll be covering in the program? Have any other questions? Don’t hesitate to contact externships@centralsan.org.