Chief Treatment Plant Operator

The City of Mill Valley and Sewerage Agency of Southern Marin (SASM) are seeking an experienced wastewater professional to serve as Chief Treatment Plant Operator.

This key supervisory position oversees the safe, reliable, and efficient operation of SASM’s wastewater treatment facilities. Responsibilities include supervising the operations team, managing process control, supporting regulatory compliance, coordinating equipment maintenance and repairs, and contributing to agency planning and priorities. SASM serves approximately 30,000 Southern Marin residents and operates a treatment plant with an average dry weather flow of 1.8 MGD.

The successful candidate will be an experienced and collaborative manager who can represent the agency professionally, train and mentor staff, and respond effectively to operational needs and after-hours emergencies.

Please see the CalOpps.org application for detailed information about the opportunity, minimum qualifications, and a list of essential duties and responsibilities for the position. 

Minimum Qualifications

• Five (5) to seven (7) years of progressively responsible wastewater treatment plant operations and maintenance experience, including supervisory responsibilities
• High school diploma or equivalent
• California Grade IV Wastewater Treatment Plant Operator Certification or higher
• Ability to work nontraditional hours and participate in on-call and emergency response assignments

Benefits

The City offers excellent benefits, including City-paid medical and dental coverage, CalPERS retirement, generous leave, paid family leave, deferred compensation matching, professional development opportunities, and discounted access to City recreation programs and facilities.

Please see the CalOpps.org application and City of Mill Valley website to learn more about benefits of the position. 

Save the Dates

First-round interviews: October 15, 2026
Second-round interviews: October 22, 2026

Interviews are expected to be held in person at SASM. Virtual participation must be requested and approved in advance.

A completed application, cover letter, and resume are required. Please read the ‘Special Instructions’ section on the CalOpps.org application for information about the application process.