6.3 EPA Worker Protection Standard (WPS) & Agricultural Employer Duties
Key Takeaways
- The EPA Worker Protection Standard (40 CFR Part 170) applies to agricultural establishments (farms, forests, nurseries, greenhouses) and commercial pesticide handling establishments that employ agricultural workers or handlers.
- WPS distinguishes between Workers (who perform hand labor in treated areas) and Handlers (who mix, load, apply, clean equipment, or enter treated areas during an active REI); both require mandatory annual EPA-approved safety training before performing tasks.
- Central Posting Locations must continuously display the 2018 EPA WPS safety poster, emergency medical contact information, and specific pesticide application records (displayed before application and retained for 30 days post-REI; application logs retained for 2 years).
- Decontamination supplies must be stationed within 1/4 mile of all workers (1 gallon water per worker, soap, single-use towels) and handlers (3 gallons water per handler, soap, towels, clean clothes, and a 15-minute continuous eye flush station).
- Under the 2024 AEZ rule effective December 3, 2024, the Application Exclusion Zone is 100 feet for aerial, air-blast, fumigant/smoke/mist/fog and smaller-than-medium spray qualities and 25 feet for ground applications released more than 12 inches above the soil using medium or larger spray quality; it applies both on and off the agricultural establishment, and the handler must suspend the application whenever any person is inside it.
6.3 EPA Worker Protection Standard (WPS) & Agricultural Employer Duties
Statutory Scope: Codified at 40 CFR Part 170, the Worker Protection Standard (WPS) is a federal regulation issued by the EPA under FIFRA. It is designed to reduce the risk of pesticide poisonings and injuries among agricultural workers and pesticide handlers on farms, forests, nurseries, and enclosed commercial greenhouse establishments, as well as commercial pesticide handling enterprises.
Compliance with the WPS is mandatory for all agricultural employers and commercial pesticide handling employers in Colorado. The WPS establishes legally enforceable duties across three core pillars: Information, Protection, and Mitigation.
1. Scope, Purpose, and Key Definitions
The WPS defines two distinct categories of agricultural employees based on their occupational tasks:
┌─────────────────────────────────────────────────────────────────────────────┐
│ WPS OCCUPATIONAL CLASSIFICATIONS │
├─────────────────────────────────────────────────────────────────────────────┤
│ │
│ 1. AGRICULTURAL WORKER (40 CFR § 170.305) │
│ • Any person employed for compensation who performs hand-labor tasks │
│ in an agricultural field, forest, nursery, or greenhouse. │
│ • Tasks: Harvesting, weeding, thinning, pruning, planting, irrigating. │
│ • Protections: Entry restrictions (REI), central posting, basic training│
│ and field decontamination stations (1 gallon water per worker). │
│ │
│ 2. PESTICIDE HANDLER (40 CFR § 170.305) │
│ • Any person employed for compensation who directly interacts with │
│ pesticides, concentrated chemicals, or unrinsed application equipment.│
│ • Tasks: Mixing, loading, transferring, applying, flagging, cleaning, │
│ servicing spray rigs, handling open containers, or early REI entry. │
│ • Protections: Mandatory PPE, respirator clearance, handler training, │
│ enhanced decontamination (3 gal water/handler + 15-min eye flush). │
│ │
└─────────────────────────────────────────────────────────────────────────────┘
Minimum Age Restrictions
Under the revised WPS rules, agricultural employers must ensure that all pesticide handlers and early-entry workers are at least 18 years of age. (An exemption from this age restriction applies only to the agricultural establishment owner and members of their immediate family on their own family farm).
2. Central Information Display & Application Records
Agricultural employers must establish a Central Posting Location that is easily accessible to all workers and handlers at all times during normal working hours (e.g., at a main packing shed, central office, or break area).
┌─────────────────────────────────────────────────────────────────────────────┐
│ CENTRAL POSTING THREE-PART DISPLAY │
├─────────────────────────────────────────────────────────────────────────────┤
│ 1. EPA WPS SAFETY POSTER (2018 Revised Version): Contains safety concepts, │
│ dermal decontamination guidance, emergency rules, and anti-retaliation. │
│ 2. EMERGENCY MEDICAL INFORMATION: Specific name, physical street address, │
│ and direct telephone number of the nearest emergency medical facility. │
│ 3. PESTICIDE APPLICATION SPECIFIC INFORMATION: Detailed record of every │
│ application made on the establishment within the past 30 days. │
└─────────────────────────────────────────────────────────────────────────────┘
Specific Application Information Requirements
Before any pesticide application begins (or before workers enter the establishment), the employer must post:
- Product Identity: Product brand name, EPA Registration Number, and active ingredient(s).
- Location: Exact description and map/delineation of the treated agricultural area.
- Timing: Scheduled application date, start time, and estimated completion time.
- Restricted-Entry Interval (REI): Exact duration of the label-mandated REI.
- Safety Data Sheet (SDS): OSHA Safety Data Sheet for each pesticide applied.
Display and Record Retention Timelines
- Posting Duration: The application information and SDS must remain displayed at the central location for at least 30 consecutive days after the expiration of the active REI.
- Historical Recordkeeping: Employers must retain all pesticide application records and SDSs for 2 years following the application date, and make them available upon request to employees, treating medical personnel, or state (CDA) / federal (EPA) inspectors.
3. Worker and Handler Training Mandates
Under 40 CFR §§ 170.401 and 170.501, agricultural employers must ensure that all workers and handlers receive EPA-approved safety training:
- Frequency: Annual Training Required. Training is valid for exactly 1 year (12 months). (The historical 5-year grace period was abolished in the 2015/2018 WPS revisions).
- Timing: Training must be completed before a worker enters any treated area where an REI has been in effect within the last 30 days, and before a handler performs any handling activity.
- Approved Trainers: Training may only be conducted by a certified commercial or private applicator, a designated state lead agency (CDA) trainer, or an individual who has completed an EPA-approved "Train-the-Trainer" instructional course.
- Training Delivery: Must use EPA-approved instructional materials (videos, manuals) presented either orally or visually in a language that the workers/handlers understand.
- Training Records: Employer must document each training session (employee name, signature, date, trainer's credentials, EPA approval number of the training materials) and retain training logs on file for 2 years.
4. Decontamination Supplies & Emergency Medical Assistance
Agricultural employers must provide dedicated decontamination stations located together within 1/4 mile (1,320 feet) of every worker and handler, or at the nearest point of vehicular access.
| Decontamination Requirement | Agricultural Workers (40 CFR § 170.411) | Pesticide Handlers (40 CFR § 170.509) |
|---|---|---|
| Potable Water Volume | 1 gallon of clean, potable water per worker | 3 gallons of clean, potable water per handler |
| Cleaning Supplies | Soap and single-use clean paper towels | Soap and single-use clean paper towels |
| Emergency Eyewash | Clean water suitable for eye flush | Dedicated continuous-flow emergency eyewash capable of delivering 0.4 gpm for 15 minutes (if label mandates eye protection) |
| Change of Attire | Not required at field station | Clean change of clothes / clean coveralls immediately available at mixing site |
| Maximum Distance | Within 1/4 mile of work site; never inside treated area under active REI | Within 1/4 mile of handling site, mixing station, and decontamination point |
┌─────────────────────────────────────────────────────────────────────────────┐
│ EMERGENCY MEDICAL ASSISTANCE DUTIES │
├─────────────────────────────────────────────────────────────────────────────┤
│ If an agricultural worker or handler experiences acute pesticide poisoning │
│ or chemical exposure, the agricultural employer is legally mandated to: │
│ 1. IMMEDIATE TRANSPORTATION: Provide prompt emergency transportation from │
│ the agricultural establishment to an emergency medical facility. │
│ 2. MEDICAL INFORMATION PACKET: Promptly furnish treating physicians with: │
│ • Safety Data Sheets (SDS) and container product label. │
│ • EPA Registration Number, trade name, active ingredients. │
│ • Exact circumstances of application and estimated exposure dose/route. │
└─────────────────────────────────────────────────────────────────────────────┘
5. Application Exclusion Zone (AEZ) & Early-Entry Rules
Application Exclusion Zone (AEZ) Standards
The Application Exclusion Zone (AEZ) is the horizontal area immediately surrounding operating application equipment during an outdoor production-agriculture application. Three properties of the AEZ are tested constantly:
- It exists only during the application. When the application stops, the AEZ ceases to exist — although post-application restrictions such as the REI still govern the treated area.
- It moves with the equipment. It is not a fixed boundary drawn around the field.
- It is not limited by the property line. It can extend off the establishment onto school grounds, sidewalks, roads, and residential yards.
[!IMPORTANT] Know which rule you are being tested on. EPA published an AEZ rule in October 2020 that would have confined the AEZ to the employer's own property and narrowed it; a federal court enjoined it and it never took effect. EPA then finalized the current rule on October 4, 2024, effective December 3, 2024. The 2024 rule (a) restores AEZ applicability beyond the establishment boundary, (b) removes the easement exception, so an application must be suspended even where an easement prevents the employer from excluding people, and (c) replaces the old single 294-micron VMD cut-off with the ASABE spray-quality classification. Any study material still teaching "294 microns" or "the AEZ stops at the property line" is out of date.
APPLICATION EXCLUSION ZONE (AEZ) DISTANCES
┌─────────────────────────────────────────────────────────────────┐
│ 100-FOOT AEZ (minimum, horizontally in all directions) when │
│ the pesticide is applied: │
│ • By air (fixed-wing aircraft or helicopter). │
│ • By an air-blast or air-propelled method. │
│ • As a fumigant, smoke, mist, or fog. │
│ • As a spray with a spray quality SMALLER THAN MEDIUM under │
│ ASABE - i.e. Fine (F), Very Fine (VF) or Extremely Fine(XF).│
├─────────────────────────────────────────────────────────────────┤
│ 25-FOOT AEZ when the pesticide is NOT in any of the categories │
│ above AND is sprayed from a height GREATER THAN 12 INCHES │
│ above the soil surface or planting medium using MEDIUM or │
│ LARGER spray quality. │
├─────────────────────────────────────────────────────────────────┤
│ NO AEZ REQUIRED when the pesticide is released 12 INCHES OR │
│ LESS from the soil surface or planting medium using MEDIUM or │
│ LARGER spray quality (and is not aerial, air-blast, fumigant, │
│ smoke, mist or fog). │
└─────────────────────────────────────────────────────────────────┘
Spray quality is read off the nozzle manufacturer's ASABE classification for the tip, pressure and orientation actually in use — not estimated in the field. Separately from the AEZ, WPS carries a "do not contact" duty that has no distance limit at all: a handler must not apply a pesticide in a way that contacts any person, whether or not that person is on the establishment and however far away they are.
The Mandatory "Shut-Off" / Suspension Rule
Under 40 CFR § 170.505(b), the handler performing the application must immediately suspend it if any person other than an appropriately trained and equipped handler involved in the application is in the AEZ. The 2024 rule also clarifies when work may restart: the application may resume once those individuals have left the AEZ — including when they have left an area subject to an easement. In parallel, 40 CFR § 170.405 obliges the agricultural employer and the establishment owner to keep workers and other people out of the AEZ while it is within the boundaries of the establishment.
The suspension duty is absolute. Slowing down, turning nozzles away, switching to a coarser tip, or sounding a horn does not satisfy it.
Early-Entry Workers During Active REI
Entering a treated area while a Restricted-Entry Interval (REI) remains in effect is strictly prohibited, except under tightly defined statutory exceptions:
- Absolute Ban on First 4 Hours: No worker may enter a treated area under any exception during the first 4 hours post-application, or until required ventilation criteria are fully satisfied.
- Permitted Early-Entry Exceptions (After 4 Hours):
- No-Contact Activities: Worker will not contact any treated surface (soil, water, foliage).
- Short-Term Tasks: Maximum 1 hour of work in any 24-hour period (e.g., critical irrigation repairs) without performing hand labor.
- Agricultural Emergencies: Declared formal state/federal weather or pest emergency.
- Early-Entry Protections: Employers must ensure early-entry workers are at least 18 years old, receive full handler-level PPE, understand specific hazards, and have immediate access to complete decontamination facilities.
Under the EPA Worker Protection Standard (40 CFR Part 170), what are the required water volumes and maximum distances for field decontamination stations serving agricultural workers and pesticide handlers?
An applicator is operating a tractor-mounted air-blast sprayer in an orchard. A field worker walks within 75 feet of the operating sprayer. Under the Application Exclusion Zone (AEZ) rule, what action is legally required?
What three mandatory components must be displayed at an agricultural establishment's Central Posting Location under the EPA Worker Protection Standard?
Under current EPA Worker Protection Standard regulations, how frequently must agricultural workers and pesticide handlers complete approved safety training, and what is the minimum age requirement for handlers?