EPA Composting at Home Guide: The Complete Backyard Composting Reference
What Is the EPA Composting at Home Guide? The EPA Composting at Home Guide is the United States Environmental Protection Agency's official reference for ba
What Is the EPA Composting at Home Guide?
The EPA Composting at Home Guide is the United States Environmental Protection Agency’s official reference for backyard composting. Published as part of the EPA’s broader recycling and sustainable materials management initiative, this guide provides authoritative, science-backed instructions for converting kitchen scraps, yard waste, and other organic materials into nutrient-rich compost that improves soil health and reduces landfill waste.
Composting is one of the most impactful actions a household can take to reduce its environmental footprint. The EPA estimates that food scraps and yard waste together make up more than 28 percent of what we throw away. By composting these materials at home, you divert waste from landfills — where it would generate methane, a potent greenhouse gas — and instead transform it into a valuable soil amendment that enhances plant growth, improves water retention, and reduces the need for synthetic fertilizers.
The guide covers everything a beginner needs to know, from the basic science of how decomposition works to the specific ingredient ratios (greens and browns) that produce the best results. It includes clear lists of what to add and what to avoid, step-by-step instructions for starting and maintaining a compost pile or bin, troubleshooting tips for common problems like odors and pests, and guidance on when your compost is finished and ready to use. As a government-published resource, it is regularly updated, scientifically accurate, and completely free to access.
Key Features
- Greens and Browns Ratio Guide: Clear explanation of the ideal carbon-to-nitrogen ratio (roughly 3 parts browns to 1 part greens) with examples of each category to help you build a balanced pile.
- What to Add and What to Avoid: Comprehensive lists of compostable materials (fruit peels, coffee grounds, leaves, grass clippings) and items that should never go in a home pile (meat, dairy, diseased plants, pet waste).
- Step-by-Step Setup Instructions: Detailed directions for starting a compost pile or bin, including site selection, layering techniques, and initial sizing recommendations.
- Troubleshooting Section: Solutions for common composting problems such as foul odors, fruit flies, slow decomposition, and overly wet or dry piles.
- Maintenance Schedule: Guidance on how often to turn your pile, monitor moisture levels, and add new materials for optimal decomposition speed.
- Multiple Composting Methods: Descriptions of various approaches including open piles, enclosed bins, tumblers, and vermicomposting (worm composting) so you can choose the method that fits your space and lifestyle.
Pros and Cons
| Pros | Cons |
|---|---|
| Published by the EPA — scientifically authoritative | Not a tool or calculator — it is a reference guide |
| Comprehensive and beginner-friendly | Lacks region-specific climate guidance |
| Completely free and accessible online | No interactive features or calculators |
| Regularly updated with current best practices | Print version requires self-printing |
| Covers multiple composting methods | Does not cover advanced topics like thermal composting for pathogens |
Pricing
The EPA Composting at Home Guide is completely free. It is published on the EPA’s official website at epa.gov/recycle/composting-home as a public service resource. There are no subscriptions, paywalls, or hidden costs. You can read the guide online, bookmark it for future reference, or print it at home for a physical copy to keep near your compost bin. The EPA also offers related free resources on recycling, reducing food waste, and sustainable yard care through their website.
How to Use the EPA Composting at Home Guide
Follow these steps to go from reading the guide to producing finished compost:
Step 1: Visit epa.gov/recycle/composting-home and read through the guide. Pay special attention to the greens and browns ratio section and the lists of approved and prohibited materials.
Step 2: Choose your composting method based on your available space. An open pile works well for large yards, while an enclosed bin or tumbler is better for small suburban lots. The guide describes the pros and cons of each approach.
Step 3: Select a site for your compost setup. The EPA recommends a dry, shady spot near a water source. Avoid placing your pile directly against wooden structures to prevent rot.
Step 4: Start building your pile using alternating layers of browns (dry leaves, shredded paper, cardboard) and greens (vegetable scraps, coffee grounds, grass clippings). Aim for a 3:1 ratio of browns to greens by volume. Moisten each layer as you build.
Step 5: Maintain your pile by turning it every 1 to 2 weeks with a pitchfork or compost aerator to introduce oxygen. Monitor moisture — the pile should feel like a wrung-out sponge. Add water if it is too dry or additional browns if it is too wet. Finished compost is ready when it is dark, crumbly, and smells like earth, typically in 2 months to a year depending on conditions.
Who Should Use This Tool?
This guide is essential for first-time composters who want clear, reliable instructions without having to sort through contradictory advice on gardening blogs. Homeowners with yards who want to reduce their household waste and improve their garden soil will find it immediately practical. School garden coordinators and community garden leaders can use it as a teaching resource for workshops and volunteer training. Even experienced composters will benefit from the EPA’s troubleshooting section when they encounter problems like persistent odors or slow breakdown. If you have any outdoor space and generate kitchen scraps or yard waste, this guide will help you turn that waste into garden gold.
Recommended Products
- Outdoor Compost Bin (80 Gallon): A sturdy, enclosed compost bin is the most popular choice for suburban and urban backyard composting. This model features a secure lid to deter pests, ventilation holes for airflow, and a large access door at the base for harvesting finished compost.
- Dual-Chamber Compost Tumbler: Tumblers speed up the composting process by making turning effortless. The dual-chamber design lets you fill one side while the other cures, ensuring a continuous supply of finished compost.
- Compost Thermometer (20-Inch Probe): Monitor your pile’s internal temperature to track decomposition progress. Active composting occurs between 130°F and 160°F, and this long-probe thermometer lets you check without disturbing the pile.
Frequently Asked Questions
Can I compost during winter?
Yes. Decomposition slows significantly in cold temperatures but does not stop entirely. You can continue adding materials to your pile throughout winter. The outer layers may freeze, but the core often remains active. Decomposition will accelerate again when temperatures rise in spring.
How do I keep pests and animals out of my compost?
The EPA recommends never adding meat, bones, dairy, oils, or greasy foods — these are the primary attractants. Use an enclosed bin with a secure lid rather than an open pile if pests are a concern. Bury fresh green materials under a layer of browns to reduce odors that attract animals.
How long does it take to make finished compost?
With active management — regular turning, proper moisture, and a good greens-to-browns ratio — you can produce finished compost in as little as 2 to 3 months. A more relaxed approach with infrequent turning typically takes 6 to 12 months. Finished compost is dark, crumbly, and has an earthy smell with no recognizable food scraps remaining.
Can I compost citrus peels and onion scraps?
Yes, in moderation. The EPA guide includes citrus and onion scraps as compostable materials. While some sources claim they harm worm populations in vermicompost bins, they are perfectly fine in standard backyard piles as long as they are mixed with plenty of browns.
Do I need to add special starters or activators to my compost?
No. The microorganisms that drive decomposition are naturally present on the surface of the materials you add. Simply mixing greens and browns in the correct ratio and maintaining adequate moisture and oxygen is sufficient. Commercial compost activators are available but not necessary for home composting success.