• Sanitary District 5: Serving Tiburon and Belvedere, CA

    Sanitary District 5: Serving Tiburon and Belvedere, CA

    The District serves over 3,500 households, collecting, processing, and treating wastewater in accordance with State and Federal Regulations under a National Pollution Discharge Elimination System Permit.

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Sani5 News


Backflow Preventers

If a blockage occurs in the sanitary sewer system, sewage will rise through a manhole and overflow to the surrounding area. However, if your house plumbing is below the level of the overflowing manhole, the sewage can backup through your house side sewer lateral and enter your home through your plumbing drains. Backflow prevention devices are designed to prevent sewage from entering your home and are mandated by building code as well as District ordinance. When the need for a backflow prevention device is overlooked or ignored, the consequences can be devastating.


Environmental Initiatives

Water recycling

With cost estimates approaching $600,000, limited storage capacity and a lengthy payback period (40+ years), a program to deliver "Title 22" recycled water to the community-at-large is difficult to justify even if funds were available. Undaunted however, the District is pursuing opportunities with individual home-owners where their proximity to its facilities makes it feasible.

Alternative Energy

Although the main plant is located in a south-facing, "solar-power sweet spot," the District's facilities are without sufficient roof-area or adjacent real-estate for the installation of photovoltaic panels to make a meaningful contribution to its energy needs. However, through its participation in PG&E's demand reduction programs and through the use of the methane gas that is a byproduct of operations, the District was able to reduce its utility costs by 1.5% over the previous year.


Proposed 2010-2014 Sewer Rate Increases

Sewer Service Charge Increase Proposed to Ensure Continued Public Health and Environmental Protection

Although wastewater collection and treatment is a service we all rely on many times each day, it works so well that most of us never stop to think about it.

But now, a sewer service charge increase is needed, and we are working to inform our customers about it. Without the increase, the District will not be able to pay for critically needed upgrades, increasing the risk of having to pay far more to regulators for not complying. In the event of a spill, there could be astronomical fines, and potential damage to the environment and public health.

Although we have taken every reasonable step to lower costs and stretch funds, it has been determined that rate increases are necessary to cover the costs of the upgrades.


Report on May 13, 2008 Discharge Event

On May 13, 2008 between 12:00 a.m. and 7:00 a.m. the main treatment facility located at 2001 Paradise Drive released 67,500 gallons of water into Raccoon Straits in the usual method.  However, the discharged water had undergone only Primary treatment and Disinfection, not the usual Secondary treatment.  Under our NPDES Permit, releasing water with only primary treatment is allowed only during extreme wet weather.  Therefore, the District immediately notified the State Office of Emergency Services, Regional Water Quality Control Board, Directors of Environmental Health, Marin County Department of Health Services and the County Public Health Officer.  Within thirty minutes of reporting, warning signs were placed along the Bay notifying the public to stay out of the water.


New Paradise Cove Treatment Plant

Paradise Cove's new self-contained wastewater treatment plant is slated for delivery and installation in June and will replace an existing plant that is currently twenty years older than it's projected twenty year service life. The new 'plant' is actually two plants that will operate in tandem, increasing capacity, reducing the load on any single plant and also facilitating regular preventative maintenance. One plant can stay on-line while the other is undergoing maintenance.

Kudos to the District's staff for keeping the existing Paradise Cove plant operational and incident-free for over forty years!

The engineering firm responsible for installation of the new plant had planned to use a helicopter to deliver the equipment, but our ever vigilant District Manager, Bob Lynch, convinced them that he could have it delivered by barge at significantly less expense and without the disturbance to the neighborhood that the helicopters would have created. This saved the District between $60,000 and $80,000.

Sewer Emergencies

24 Hours

(415) 779-9048

Dial 9-1-1 if public health or property is threatened.

Our Mission

Sanitary District No.5 of Marin County is a special District, which while meeting or exceeding all applicable local, state and federal laws and regulations, is dedicated to the protection of public health and the environment through effective and economical collection, conveyance, treatment and disposal of wastewater.