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Find Out How Sewer Authority Mid-Coastside Keeps Our Poop Out of the Ocean at their 2023 Open House

November 18th, 2023 @ 10:00am - 2:00pm

Tours in English and Spanish.






Sewer Authority Mid-Coastside (SAM) Meetings ~ 2nd & 4th Mondays @ 7:00pm


Watch remotely. Comments and questions by email.

SAM Agendas and Zoom Links

SAM Meeting Videos via Pacific Coast TV




Contact Us

Our regular office hours are 7:00 a.m. through 4:00 p.m., Monday through Friday, excluding holidays. The Authority can be reached 24-hours a day at:
(650) 726-0124

Our Mailing Address is:

Sewer Authority Mid-Coastside
1000 Cabrillo Hwy N.
Half Moon Bay,  CA  94019

(650) 726-7833 (fax)


Regular Board Meetings are on the 2nd and 4th Mondays of each month at 7:00pm.

From time to time a meeting date may be changed, cancelled or relocated. Check the posted agenda for any changes to the normal schedule (click on links below).

The Sewer Authority Mid-Coastside (SAM) provides wastewater treatment services and contract collection maintenance services for a population of approximately 27,000 in the following areas:

  • City of Half Moon Bay
  • El Granada
  • Miramar
  • Montara
  • Moss Beach
  • Princeton by the Sea


SAM Directors

SAM is a joint powers authority (JPA) created by its three member agencies: City of Half Moon Bay (City), Granada Community Services District (GCSD), and the Montara Water and Sanitary District (MWSD).


The JPA is a separate, independent, public agency created by the member agencies to perform functions and share powers common to the member agencies. Those powers are outlined in a joint exercise of powers agreement (Agreement). The Agreement creating SAM can be found on the Documents page.


Each Agreement identifies how the independent agency will be governed. In the case of SAM, each member agency appoints two members from its governing board to represent it on the SAM Board of Directors, for a total of six directors.


The Agreement also establishes the weight of each director’s vote. The vote by each representatives from the City is given the weight of two votes. The vote by each representative from GCSD and MWSD is given the weight of one vote. The total number of possible votes is eight. A quorum is a minimum of five votes and resolutions require at least six votes to pass.


Barbara Dye

Vice-ChairRepresenting the Granada Community Services District

Deborah Ruddock

Secretary/TreasurerRepresenting the City of Half Moon Bay

Peter Dekker

Director, Representing the Montara Water & Sanitary District

Matthew Clark

DirectorRepresenting the Granada Community Services District



Video Tour of the SAM Plant


SAM Admin Building
1000 Cabrillo Hwy N
Half Moon Bay, CA 94019
+ Google Map