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City of Cambridge

Curbside Composting

Compost Rollout City Hall Lawn Sign In 2009, the City set a goal to reduce residential trash disposal by 30% by 2020, and by 80% by 2050 . With that goal in mind, the City has committed to expanding the current curbside compost program to all residential buildings with 1 to 12 units beginning April 2018. This will increase the program from 5,200 households to 25,000 households (8,100 buildings).

The Curbside Compost Program will expand to all buildings with 1 to 12 units on April 2. Food scraps and compostables will be picked up weekly on the same day as trash and recycling. Residents with Tuesday, Wednesday, Thursday and Friday trash collection will automatically receive information and materials starting on March 26. Weekly curbside collection begins citywide the first week in April.

By composting our food scraps, we can:
  • Reduce our climate change impact. Instead of landfilling food waste, we can create clean energy from our compost. 
  • Grow more food. Composting helps make fertilizer for New England farms.

Tips and FAQs

How can I participate?

Eligible Cambridge residents will receive a kitchen compost bin and a lockable curbside bin.
  • Collect compostable items in the kitchen compost bin and empty them into the curbside bin.
  • Put curbside bin out on your regular trash/recycling day.

March 26 – April 5: Compost bins delivered.

April 2: Curbside Compost Pickup begins the first week of April on your trash/recycling day.

Who is eligible to participate?

Cambridge residents with city trash/recycling pickup in buildings with up to 12 units.

If you’re not eligible, simply bring your food scraps to:
  • Cambridge Community Center 5 Callender St. (Howard St. side)
  • Danehy Park New St. Parking Lot
  • Recycling Center 147 Hampshire St. (Tues/Thurs 4-7:30pm, Sat 9am-4pm)

I live in a building with more than 12 units, will my building be eligible to participate eventually?

We hope to expand curbside compost collection to 13+ unit-buildings with City trash collection in the near future.

When is my curbside compost picked up?

Just as you do with your trash, recycling, and yard waste, place your curbside compost cart on the curb weekly by 7am the day of collection or after 6pm the night before on your regular collection day.

What are some tips for the Curbside Compost program?

To keep bins clean: Use compostable bags and drain liquids. Wash compost carts with warm water and dish soap. Drain soapy water from your compost cart onto grass or soil -- not on the sidewalk, driveway, or into storm drains. Never pour fats, oils or grease down the drain.

To keep odors down: Wrap meat, fish and shellfish in newspaper. Set the cart out on the curb every week -- even if it is not full. In the summer, keep food scraps in the refrigerator or freezer until just before pickup. Sprinkle baking soda on the bottom of your bins.

To manage fruit flies: Add food-soiled napkins or paper towels to food scraps. Store your kitchen bin in the freezer. Set a fruit fly trap by placing a container of cider vinegar and a bit of dish soap near your kitchen bin. 

Is composting mandatory?

Composting is voluntary, but we hope everyone will participate. Start with something simple, like apple cores and banana peels, and put them in your kitchen bin instead of the trash.

My building isn't eligible. How can I still compost?

Cambridge residents may still compost by:

Also, 13+ unit buildings with City trash collection will eligible for the curbside compost program in the next 1-2 years. Stay tuned!

Can residents get finished compost back from the City?

Yes! Finished compost is available to Cambridge residents mid-April through mid-October on Tuesday's and Thursday's 4pm-7:30pm & Saturday's 9am-4pm at the DPW Recycling Center, 147 Hampshire Street 
Residents are allowed 10 gallons per visit. Bring your own bucket or receptacle to fill. 

I use an in-sink garbage disposer. Should I discontinue that?

Yes, to reduce the risk of costly sewer backups, we strongly recommend using the curbside compost program rather than using in-sink disposals. 

I already compost in my backyard. Should I discontinue that?

Not necessarily. Feel free to continue composting in your yard. Residents may use the curbside compost program to compost whatever you can’t put in your backyard compost. You may also use curbside composting as backup in the winter. Also, if your backyard compost bin is attracting rodents, we suggest switching to the curbside compost program. 

What if my curbside compost bin is missed on collection day?

It's the same protocol for if your trash or recycling is missed. 

Report a missed curbside compost pickup at CambridgeMA.Gov/CommonwealthConnect between 4pm on collection day and 9am the day after your collection. 

Why should residents use compostable bags?

Compostable plastic bags keep bins clean and keep odors to a minimum. They also make it easier to bring food scraps from your kitchen out to your compost cart on your way out. You may line your kitchen bin with paper bags instead, but please no regular plastic bags; they aren't accepted.

How can I get more compostable bags?

Your kitchen kit includes a 6-month supply of EcoSafe 6400 compostable bags. These BPI-certified bags are available online through Amazon.com. You can also buy them by special order at Ace hardware stores. The City is presently working with local retailers to increase access to EcoSafe 6400 bags in stores at a discounted rate. Check the website in the fall of 2018 for a list of stores that carry EcoSafe and other BPI-certified compostable bags.

Will composting smell in my home?

If you use compostable bags and keep liquids out, you should be able to keep bins nearly odor free. Bring food scraps out to the curbside compost bin every 3-4 days to minimize odors.

Will the curbside compost bin attract rodents?

The curbside compost bins are more secure than trash bins for disposal. By moving your food from your trash bin into thicker-walled carts equipped with rodent-proof latching lids, you should be able to reduce rodent activity. To keep critters out, keep your curbside compost bin locked at all times. 

After DPW picks up the compost, where does it go?

DPW brings food scraps and other compostables to a facility in Charlestown where it is screened to remove contaminants and blended into a slurry that has a consistency similar to cooked oatmeal. The slurry then goes into an anaerobic digestion tank that uses microbes to eat the organic material, releasing methane. The methane is captured to make clean energy in the form of heat and electricity. Remaining solids are made into a nutrient-rich fertilizer for use on agricultural fields in Massachusetts.

Are any other cities doing this?

Composting has deep roots in Cambridge. Many Cambridge residents remember placing food scraps in in-ground buckets which were then collected to feed to pigs. The City has assisted with backyard composting, offered worm composting workshops, and helped businesses set up composting operations. In addition to piloting curbside collection, Cambridge now composts in every school, and also maintains 3 food scrap drop-off locations.

Residents in cities like San Francisco and New York City have been composting at the curb for years. Massachusetts is home to many pilot curbside compost collection programs. As the first municipality in the state to offer citywide collection free of charge, Cambridge is leading the way in waste reduction. 

Page was posted on 1/30/2018 9:57 AM
Page was last modified on 2/15/2018 8:47 AM

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