Preventing Sewer Overflows

Overflow Protection Device

An Overflow Protection Device can prevent a very unpleasant and potentially costly sewer back-up into your home.

Protecting your home from sewage overflows

Wherever a sewer system exists, so does the potential for overflows. Most sewage overflows occur when sewer lines are blocked by roots, grease, debris, or breakage. Raw sewage can then backup into your home or business, resulting in property damage and environmental problems.

When you see or experience a sewage overflow, report it to NSD at (707) 258-6000.  Our crew will respond within minutes, locate the blockage and determine if it is in the public sewer. If it is, the crew will remove the blockage and end the sewage overflow.

If the NSD crew determines that the problem is in the lateral sewer connecting your plumbing to the public sewer, it is YOUR responsibility, and NSD cannot remove the blockage or make repairs. You or a licensed plumber will need to make the necessary repairs.  YOU -- as a property owner -- are responsible for your plumbing!

Do YOU have an Overflow Protection Device?

Sewer Overflow Prevention  To prevent sewage from backing up into your home or business, you can install an Overflow Protection Device. This device (see diagram) can prevent sewage from entering your home or business and reroute the spill to outside your building. If you don't have one, you may want to have one installed to avoid smelly and costly sewage overflow clean-ups.

The device must be installed according to District specifications. NSD recommends that a licensed plumber install the device since elevation and location are critical to its proper operation. Once installed, keep the device accessible and free from obstructions (e.g., vegetation and dirt).

Where can you buy an Overflow Protection Device?

The device is available at plumbing supply stores.

No FOG (Fats, Oil & Grease) Down the Drain!

The main cause of clogs in sewer pipes? Fats, oil and grease (FOG) that are put down the drain! To protect your property from smelly and potentially expensive sewer overflows, just follow these simple tips:

FOG fry pan  Never pour grease or oil down the drain or into toilets. Even if you wash FOG down with hot water and soap, when the water cools the FOG solidifies in your pipes. 
Scrape all fat, grease and food scraps into the trash can.
Recycle used cooking oil at the Hazardous Waste Collection Facility or the Devlin Road Reuse & Recycle Center. 
Put baskets/strainers in sink drains to catch food scraps, and empty them into the trash.
Get a FREE grease scraper by calling the District at (707) 258-6000.

NSD also requires food service businesses to install and maintain a grease removal device (grease trap, interceptor or vault) to prevent FOG from going down the drain. Emergency Service for Sewer Back-ups

Napa Sanitation District has a sewer emergency on-call service available 24-hours a day, every day of the year. Our goal is to respond to all calls within 30 minutes. NSD will clear all plugged sewer laterals from the property line down to the main line and all District main lines. If the problem is in the homeowner's section of the lateral (from the house to the property line), the NSD crew will inform them of the situation. The homeowner is responsible for the upper lateral and house plumbing. For sewer emergencies, call (707) 258-6000.