Externship Program


Every March and October, Central San hosts a 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.


Our Spring 2021 session will be a five-day event (March 29-April 2) held online from 10 a.m. to 2 p.m. 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) can provide.


This October, depending on the status of the pandemic, Central San hopes to host a cohort of externs in person.

The word “externship” is a hybrid of “experience” and “internship.” Central San’s externship is an unpaid and informal internship where students get exposure to life at Central San via job shadowing. The shorter duration of these week-long externships is an opportunity for the group to observe, explore, and ask questions. It does not provide the same extensive, hands-on work experience as our internships, which typically last three to six months. With a small time commitment and minimal investment, our externship program is recommended to those who would like an introduction to the wastewater industry.

Throughout the one-week externship, the cohort will receive an orientation about Central San and go on to shadow individuals in multiple main functional areas (see sample schedule below). If there are particular interests from participants in the cohort, we are able to customize the program to an extent to provide a window into specific careers.


Interested students or schools can contact externships@centralsan.org to get started. We are always looking for more schools to work with and more students to welcome to the Central San community, so don’t hesitate to contact us!


  • For purposes of this program, an extern must be currently enrolled in an accredited school, college, or university and must have completed 2 full years of study. (Extern must have completed enough college units to be considered a 3rd year student). A student may also be enrolled in a vocational school.
  • Students who are not currently enrolled may qualify to be an extern if they have graduated from college or were previously enrolled within 1 year of the start of the externship.
  • Externs are considered “at-will,” short-term, non-continuous visitors with no grievance rights, benefits, or guarantees of regular employment with the District.


An externship is an unpaid position. Students are responsible for all expenses related to the externship, including travel, accommodations (if any), meals where not specified, etc.