A commercial compost facility needs five functions covered every operating day: receiving and inspection, mixing and pile building, process monitoring, equipment maintenance, and compliance records. At a small site one or two people do all five. At a large site they are separate jobs. How many people you need depends on tonnage, feedstock, method and how much material handling the method requires, so plan staffing from a task list for your own site and not from a ratio borrowed from another one.

Key takeaways

• Staff by task and hours. List every recurring task, estimate the time, and build the roster from that.
• The method drives the labor profile. Turning-based methods put hours on machines. Static, aerated methods shift hours to pile building, monitoring and maintenance.
• Training is partly a legal requirement. California requires documented training for all personnel, and Ohio and Maryland tie facility operation to state operator training or certification (Ohio’s rule allows three years from December 2025 to comply).
• The US Composting Council’s Certified Compost Operations Manager credential requires a multi-day course and two years of experience, so plan for it over time and not at startup.
• Safety training covers moving equipment, lockout, noise, dust and molds, and fire. Each one has a specific routine behind it.
• Vendor commissioning training is a start. Written procedures, checklists and cross-training are what keep a site running through turnover.

The functions every site has to cover

Function	Daily tasks	Skills	Often combined with
Site or operations manager	Schedule receiving and batches, review process data, talk to regulators, haulers and neighbors, approve product release	Composting science, permit conditions, supervision, communication	Compliance at small sites
Scale and receiving	Weigh loads, inspect for contamination and prohibited material, direct trucks, reject or surcharge loads	Feedstock recognition, customer handling, recordkeeping	Administration
Equipment operators	Grind, mix to recipe, build and break down piles, move material to curing, screen, load out	Loader, grinder and screen operation, recipe judgment by feel and by test	Pile monitoring at small sites
Process monitor	Check temperatures, oxygen and moisture, adjust aeration, sample, log pathogen reduction data, walk the site for odor	Reading trends, sampling, instrument care	Manager or lead operator
Maintenance	Pre- and post-shift inspections, greasing, wear parts, blower and probe checks, repairs	Mechanical and electrical basics, lockout procedures	Operators, or a contract mechanic
Compliance and records	Keep temperature logs, training records, complaint log, inspection reports, lab results, agency reports	Attention to detail, familiarity with the permit	Manager or administration

What changes the size of the crew

Tonnage and delivery pattern. Labor follows the peaks. A site that receives most of its material in a few hours each morning, or in a fall leaf season, needs enough operators for the peak and useful work for them the rest of the time.

Feedstock. Food scraps and biosolids need prompt mixing on arrival and more inspection. Contaminated loads add sorting time at the front and screening time at the back.

Method. Turned windrows require repeated passes with a turner or loader across the whole active area. Aerated static piles replace most turning with blowers, so machine hours fall and attention shifts to building piles correctly the first time. Covered systems add cover placement and removal to pile building. Negative aeration with a biofilter adds media monitoring and periodic replacement. Enclosed and in-vessel systems add mechanical and air-handling maintenance. Our comparison of windrow, aerated static pile and in-vessel methods describes each.

Automation. Continuous temperature and oxygen logging with alerts reduces manual probing and transcription. Sustainable Generation’s SG COMPOST CONTROL™ System page describes remote access from any device, automated alerts by email, text or dashboard, and exportable compliance reports. Tools like this change who can check a pile and when. They do not replace someone walking the site.

Operating hours and coverage. Weekend receiving, holidays, vacations and sick days all need a named backup for each function.

Skills that matter most

Equipment skill is the easiest to hire for and the least specific to composting. The harder skills are judgment about material and discipline about routine.

In an interview published by SG, Cesar Mendoza, SG’s technical manager and a former organics supervisor, calls training of the day-to-day operators “the real secret” of equipment maintenance, because they see and touch the equipment every day. He names poorly trained operators as the biggest factor in equipment problems and recommends daily pre- and post-shift inspections, written inspection forms, and standard operating procedures as the repeatable way to get consistent results. He also describes honesty and accurate records as the basis of working with regulators.

For operators, the composting-specific skills are:

• Judging moisture and structure in a mix, and knowing when to test instead of guess
• Building a pile to the designed dimensions without compacting it
• Recognizing contamination and prohibited material at the tipping area
• Reading a temperature trend and knowing what a stalled or overheating pile looks like
• Noticing odor at its source and tracing it to a cause

Safety training

Moving equipment and machinery

Loaders, grinders, turners and screens are the heaviest hazards on a compost site. Cornell’s fact sheet on composting health and safety points out that composting and chipping equipment contains flails, knives or hammers rotating at high speed, which should be well shielded from human contact. Training covers traffic patterns, spotters, blind spots, and keeping the public and truck drivers out of working areas.

Maintenance on that equipment falls under the federal lockout standard. OSHA’s 29 CFR 1910.147 covers servicing and maintenance of machines where unexpected energization or startup could injure employees, and it requires training for authorized employees, affected employees and others who work in the area, with retraining when jobs, equipment or procedures change. Clearing a jammed grinder or screen is the classic case.

Noise

Grinders and screens are loud. Under OSHA’s occupational noise standard, 29 CFR 1910.95, an employer must run a hearing conservation program whenever employee exposures equal or exceed an 8-hour time-weighted average of 85 decibels on the A scale. Measure exposure at the grinder and screen positions before deciding who is in the program.

Dust, molds and bioaerosols

Active compost carries large populations of molds and fungi. The Cornell fact sheet states that these can cause allergic reactions in sensitive individuals, lists conditions that raise a person’s risk (including a weakened immune system, allergies and asthma), and recommends dust masks or respirators in dry and dusty conditions, especially when compost is being turned. Practical controls are enclosed, filtered loader cabs, keeping material moist, limiting turning and screening in high wind, and telling new staff about the hazard before they start. Methods that disturb piles less often, and methods that contain the pile, reduce the number of dusty events.

Fire

Spontaneous combustion is a known risk in large, dry stockpiles. The same Cornell fact sheet gives the at-risk moisture range as 25 to 45% and notes the material must first heat past 93 degrees Celsius (200 degrees Fahrenheit), which typically requires a pile over 12 feet high. A BioCycle article on preventing and extinguishing compost fires recommends weekly monitoring of all piles, attention to vents on the pile surface, limits on pile depth, and meeting the fire department in advance. Staff should know who checks stockpiles, what temperature triggers action, and how a hot pile is broken down.

Odor response

Odor is a training topic and a compliance topic at once. In California, 14 CCR 17863.4 requires an odor impact minimization plan that includes a monitoring protocol, a complaint response and recordkeeping protocol, and operating procedures for minimizing odor, and the operator must review it annually. Every employee should know what the plan says and who takes a complaint call. Our guide to compost odor management covers the plan in detail.

Certifications and state training rules

US Composting Council credentials

The USCC Certification Commission offers two credentials. Its eligibility requirements for the Certified Compost Operations Manager (CCOM) are: age 21 or older, a high school diploma or equivalent, an instructor-led basic compost operations training course of three or more days, and at least two years of full-time experience related to organics recycling, including at least one year working full-time in compost facility operations. Candidates then pass an exam.

The Certified Composting Professional (CCP) is aimed at roles such as consultant, engineer, designer, compliance staff and educator. It requires at least five days of training and a minimum of four years of full-time experience related to composting facility design, implementation or operation.

Because of the experience requirement, a new site cannot produce a CCOM in its first months unless it hires one. A realistic plan sends the lead operator to a multi-day course early and targets the credential once the experience is in place.

State requirements

Rules differ by state, and the three below are examples as of October 2026. Check the current text for your state.

• California. 14 CCR 17867.5 requires operators to ensure that all personnel assigned to the operation are trained in subjects pertinent to operations and maintenance, including contaminant and hazardous materials recognition and screening, with emphasis on odor impact management and emergency procedures. A record of the training must be kept on site.
• Ohio. The operating rule for Class II composting facilities, OAC 3745-560-210, took effect on December 1, 2025. Not later than three years after that date, the owner or operator must ensure that the technical operation and maintenance of the facility is under the responsible charge of an operator certified by the director as having completed the state’s operator training.
• Maryland. COMAR 26.04.11.09 requires facilities to keep a listing of personnel who hold a composting operator certification issued by the Maryland Department of Agriculture, and to complete and document operator training in the basics of composting facility operations.

A training plan for a new site

1. Before construction ends. Hire the manager and lead operator. Send them to a multi-day compost operations course and, if possible, to work for a few days at an operating facility that uses the same method.
2. Write the procedures. Draft standard operating procedures for receiving, mixing, pile building, monitoring, cover or media handling, equipment inspection, complaint response and emergencies. Write them with the vendor’s manuals and the permit open side by side.
3. Commissioning. Have the technology supplier train the whole crew on site, on the installed equipment, with real feedstock. Record who attended and what was covered.
4. First batches. Run the first several batches with the supplier’s technician available. Review each batch against the procedure and correct the procedure where it was wrong.
5. Safety program. Complete lockout, equipment, noise, dust and fire training before each person does the task alone. Walk the site with the fire department.
6. Cross-train. Within the first three months, make sure at least two people can do each function, including the compliance records.
7. First year. Hold short monthly refreshers tied to what went wrong that month. Review the odor plan and the training records before the first annual inspection.
8. Ongoing. Plan the lead operator’s path to certification, retrain when equipment or procedures change, and train every new hire from the written procedures.

What to ask a technology vendor about training

• Who delivers commissioning training, for how many days, and to how many of our staff?
• What written procedures, checklists and manuals come with the system?
• Who answers the phone when a blower, probe or control fault appears, and during what hours?
• What routine maintenance do our staff do, and what requires the vendor?

SG’s own pages answer some of these for its systems. The pilots and demos page states that on-site commissioning and training are included with a pilot, and the leasing program page lists system training and ongoing technical assistance. The operator training and support page describes technicians who remain available for the life of the system under an extended service contract, for maintenance guidance, troubleshooting, adjustments for new feedstock and component repairs. Get the scope of any vendor’s training and support written into the contract, a point our composting technology RFP guide covers.

FAQ

How many people does it take to run a compost facility?

It depends on tonnage, feedstock, method and operating hours, so no single number applies. Small sites run with one or two people covering every function. Larger sites separate receiving, equipment operation, monitoring, maintenance and compliance. Build your estimate from a task list with hours, and include backup coverage for weekends, vacations and peak seasons.

Is compost operator certification required by law?

In some states. Ohio’s rule for Class II composting facilities, effective December 1, 2025, gives owners three years to put the facility under the responsible charge of an operator certified by the director, and Maryland’s rules refer to operator certification issued by its Department of Agriculture. California requires documented training for all personnel without naming a credential. Check your state’s composting rule and your permit conditions, as of October 2026 and at each renewal.

What is the Certified Compost Operations Manager credential?

It is a professional certification from the US Composting Council’s Certification Commission. Candidates must be at least 21, hold a high school diploma or equivalent, complete an instructor-led compost operations course of three or more days, have two years of related experience including one year in facility operations, and pass an exam.

What safety hazards should compost workers be trained on?

Moving equipment and rotating machinery, lockout during maintenance, noise from grinders and screens, dust and mold exposure during turning and screening, heat and cold stress, and fire in stockpiles. Each needs a written procedure and a named person responsible. Workers with asthma, allergies or weakened immune systems should be told about mold exposure before they start.

Next step

Draft your task list and training plan before you compare technologies, then ask each vendor to mark which tasks its system changes. To see how training fits into a trial, read about SG’s pilots and demos, or talk through staffing for your site with the consulting team.

Related guides

• Compost Process Control: Oxygen, Temperature, Moisture and C:N
• Compost Facility Odor Management
• Converting a Windrow Site to Covered ASP
• Compost Facility Lifecycle Cost
• Composting Technology RFP Guide

← All commercial composting guides

Test covered ASP on your own feedstock

An SG Mobile® pilot runs real batches of your material and produces the data a permit, grant or board decision asks for.

Start a pilot · Talk to the SG team