Business & Residential Rates

Sewer service fees appear on Marin County Property Tax Statements. The fees charged for residential dwellings and businesses are calculated differently. Business fees are based on water usage. The more water that is used by a business, the more wastewater created for collection by the district and treatment by the sewage treatment plant.


You should be aware that while your sewer fee appears as one charge on your tax bill, the fee actually funds two separate and independent organizations: Ross Valley Sanitary District, which provides the collection system that delivers wastewater to the treatment plant, and Central Marin Sanitation Agency, which treats wastewater before pumping it into the San Francisco Bay.

Requests for Refunds

If you believe that you have been billed incorrectly for the Sewer Service Charge, you may request a refund within 3 years of the date of the charge in question. View the refund request form.