Residential Food Waste Composting Collection in Seattle: Your Guide

Seattle’s Food & Yard Waste Program Explained

Seattle has established one of the most robust food and yard waste programs in the nation, managed by Seattle Public Utilities (SPU). This essential service is designed to divert organic materials from landfills, where they produce harmful methane gas, and instead transform them into nutrient-rich compost. For most Seattle residents, participation is not just encouraged, but mandatory. By composting, you contribute directly to reducing greenhouse gas emissions, creating valuable soil amendments for local agriculture, and promoting a more sustainable Seattle.

The program encompasses a wide range of organic materials, making it easy to integrate into daily household routines. Understanding the guidelines ensures your efforts effectively contribute to the city’s environmental goals.

What’s Accepted: Food Scraps, Soiled Paper & Yard Waste

Your green food and yard waste cart is designed for a broad spectrum of organic materials. Knowing what belongs helps prevent contamination and ensures your waste is properly processed into compost.

All Food Scraps

This includes, but is not limited to:

  • Fruits and vegetables: Raw, cooked, or spoiled.
  • Meat, poultry, and fish: Bones, shells, and all animal products.
  • Dairy products: Cheese, yogurt, and other dairy items.
  • Grains and pasta: Bread, rice, noodles, cereal.
  • Coffee grounds and tea bags: Including paper filters.
  • Eggshells.
  • Grease and oils: Small amounts, absorbed by paper towels or other compostable materials. Large quantities of liquid oils should not be poured directly into the cart.

Approved Soiled Paper

Materials that are primarily paper and contaminated with food can go in, such as:

  • Paper towels and napkins (used).
  • Pizza boxes (greasy sections are fine, remove plastic inserts).
  • Paper plates (uncoated).
  • Paper grocery bags (used for food scraps).
  • Compostable food service ware (look for BPI certification).

Yard Waste

Common garden and landscape materials are also accepted:

  • Grass clippings.
  • Leaves.
  • Branches (under 4 inches in diameter and 4 feet long).
  • Weeds.
  • Plant trimmings.

What’s NOT Accepted: Avoiding Contamination

To maintain the integrity of the composting stream and ensure efficient processing, it’s critical to keep certain items out of your green cart. Contamination can lead to loads being rejected, additional processing costs, and environmental harm.

Prohibited Items Include:

  • Plastics: Any form of plastic, including plastic bags (unless certified compostable by BPI), plastic packaging, plastic wrap, or plastic food containers.
  • Glass: Bottles, jars, broken glass.
  • Metals: Aluminum foil, cans, utensils.
  • Liquids: Large quantities of soups, juices, or cooking oils. Small amounts absorbed by compostable materials are acceptable.
  • Pet waste & animal litter: This includes dog waste, cat litter, and any animal feces.
  • Diapers: Both disposable and cloth diapers are not compostable.
  • Styrofoam: Any foam product.
  • Hazardous waste: Chemicals, paint, batteries, electronics.
  • Treated or painted wood: Lumber, furniture.
  • Rocks, dirt, and sod: Large quantities of these should be handled separately.

Setting Up Your Kitchen & Outdoor Collection

Establishing an efficient system for composting at home makes the process simple and hygienic.

Indoor Food Scrap Collection

  • Kitchen Bin: Use a small, sealable container on your countertop or under the sink. Many residents find a 1-gallon bin ideal. Look for containers specifically designed for food scrap collection, often with ventilation to reduce odors.
  • Compostable Bags: To keep your kitchen bin clean and manage odors, use BPI-certified compostable bags. These bags are designed to break down in commercial composting facilities. Alternatively, you can line your bin with newspaper or simply go bag-free, rinsing the bin regularly.
  • Storage: Keep your kitchen bin accessible for daily use but in a place that minimizes odors, such as under the sink or in a pantry.

Preparing Your Outdoor Green Cart

  • Regular Transfer: Transfer your kitchen scraps to your large green SPU cart regularly, ideally every few days or as your kitchen bin fills.
  • Layering: To prevent food scraps from sticking to the bottom of the green cart and to absorb moisture, layer them with yard waste (leaves, grass clippings) or newspaper.
  • Placement: Ensure the lid of your green cart can close completely. Overfilled carts may not be collected.

Collection Day & Service Schedule Logistics

Seattle Public Utilities provides weekly collection for food and yard waste, ensuring regular removal of organic materials.

  • Collection Frequency: Residential food and yard waste carts are collected once a week.
  • Finding Your Collection Day: Your specific collection day is typically determined by your address. You can easily find this information using the “Find Your Collection Day” tool on the Seattle Public Utilities website by entering your address.
  • Cart Placement: On your collection day, place your green cart at the curb or alley by 7:00 AM. Ensure there’s at least three feet of clearance around the cart from other objects, including other bins, cars, and mailboxes, to allow the collection truck’s automated arm to access it. The cart handles should face the street.
  • Lid Closure: The cart lid must be fully closed. Overfilled carts or those with overflowing materials next to them may not be collected, or could incur extra charges.

Troubleshooting & Best Practices for Odor & Pests

Managing odors and deterring pests are common concerns with composting. Here are practical tips to keep your system clean and problem-free:

  • Use Compostable Bags: As mentioned, BPI-certified compostable bags for kitchen scraps help contain odors and moisture.
  • Layering in Green Cart: Placing a layer of yard waste (like dry leaves or grass clippings) at the bottom of your green cart, and then layering food scraps between yard waste, helps absorb moisture, reduce odors, and prevent items from sticking.
  • Rinse Bins Regularly: After emptying, rinse your kitchen compost bin and, if possible, your outdoor green cart with water. A mild dish soap can be used for kitchen bins. Allow them to air dry.
  • Store in Shade: Keep your outdoor green cart in a shaded area if possible, especially during warmer months, to slow down decomposition and reduce odors.
  • Freeze Odorous Items: For particularly smelly items like meat scraps or seafood, store them in a small bag in your freezer until collection day.
  • Deter Pests: Keeping lids tightly closed on both indoor and outdoor bins is the primary defense against pests. Regularly cleaning bins also helps remove attractants.

Guidance for Apartments & Condos

Composting in multi-family buildings often involves slightly different logistics than single-family homes. If you live in an apartment, condo, or co-op, here’s what you need to know:

  • Shared Bins: Most multi-family buildings in Seattle provide shared food and yard waste carts, typically larger bins labeled for compost.
  • Property Manager Communication: Your property manager or building owner is your primary point of contact for composting guidelines specific to your building. They can inform you about the location of the shared bins, collection schedule, and any internal rules for depositing your food scraps.
  • Indoor Collection: You will still use a small kitchen bin for collecting food scraps in your unit before transferring them to the building’s shared compost bin.
  • Educational Materials: Ask your property manager for any educational flyers or posters provided by SPU or the building that detail what is and isn’t accepted in the shared compost bins.

How to Verify in Seattle Today

To ensure you have the most current and accurate information for residential food waste composting in Seattle, here are practical steps you can take:

  1. Visit the SPU Website: Go to the official Seattle Public Utilities website and navigate to their “Food & Yard Waste” section. This is the definitive source for current guidelines, accepted materials, collection schedules, and any program updates. Look for specific PDF guides or search tools for your address.
  2. Use the SPU Collection Day Tool: Enter your address into SPU’s “Find Your Collection Day” online tool. This will confirm your exact weekly food and yard waste collection day, ensuring you place your cart out on time.
  3. Check for BPI Certification: When purchasing compostable bags or food service ware, verify they carry the BPI (Biodegradable Products Institute) certification label. This ensures they meet the standards for commercial composting facilities in Seattle.

Your Composting Decision Checklist

Before putting your green cart out, consider these questions:

  • Do I have a green food & yard waste cart from Seattle Public Utilities?
  • Am I using BPI-certified compostable bags (or no bags) for food scraps?
  • Do I know my designated weekly collection day for food and yard waste?
  • Have I reviewed the ‘What’s Accepted’ and ‘What’s Not Accepted’ lists recently?
  • Is my green cart placed correctly at the curb by 7 AM on collection day with the lid closed?

Common Composting Mistakes to Avoid

Steer clear of these frequent errors to ensure smooth composting and avoid collection issues:

  • Using regular plastic bags for food scraps, which contaminates the compost stream.
  • Including liquids like soups or cooking oils, which cause mess and processing issues.
  • Placing pet waste or animal litter in the green cart; this is not accepted.
  • Failing to separate non-compostable packaging from food items (e.g., plastic trays, foil wrappers).
  • Overfilling the green cart, preventing the lid from closing, and potentially incurring extra fees or missed collection.

Frequently Asked Questions (FAQ)

Q: Is food waste composting mandatory in Seattle?
A: Yes, for most Seattle residents with curbside collection, separating food and yard waste for composting is mandatory. SPU can impose fines for repeated non-compliance.

Q: What if I don’t have a green food and yard waste cart?
A: If you are a Seattle resident with curbside service and do not have a green cart, you should contact Seattle Public Utilities directly to request one.

Q: Can I put greasy pizza boxes in the compost?
A: Yes, greasy pizza boxes (without plastic liners or inserts) are accepted in Seattle’s food and yard waste program.

Q: Where can I buy BPI-certified compostable bags?
A: BPI-certified compostable bags are widely available at most major grocery stores, home improvement stores, and online retailers. Look for the BPI logo on the packaging.