How to read a pesticide label

Why the label matters

Before registering a pesticide, EPA requires extensive data on its health and environmental effects and makes sure the label turns those findings into directions and precautions defining who may use it and where.^[1]

State and federal agencies enforce label requirements. WSU Extension puts it plainly: any violation of the label directions breaks both state and federal law, and the label spells out where a product may be used, how much, how often, and what you must do to protect people and the environment.^[1][17]

"Labeling" covers more than the sticker on the bottle. Under federal pesticide law it includes booklets and other printed matter that come with the product or that the label refers to. Some products also have supplemental labeling for added uses; EPA requires that you have both the product label and the supplemental labeling with you when you use the product.^[1][6]

• Mandatory statements tell you to do or not do something specific, usually in directive words such as "must" or "do not". EPA's examples include "Wear chemical-resistant gloves", "Do not apply directly to water" and "Do not enter into treated areas for 12 hours."^[6][10][16]
• Advisory statements give background or tips and use softer words such as "should" or "may". They can't override a mandatory statement.^[6][10]
• WSU Extension's rule of thumb: read the label before you buy, before you mix, before you apply, and before you store or throw away the product or its container.^[17]

Parts to read before you buy and use

NPIC lists the questions a label answers: what's in the product, how toxic it is, how to use it safely, what to do if it gets in your eyes, mouth, lungs or on your skin, what it can do to the environment, what to wear, how and where to use it and how much, how to store and dispose of it, and how to reach the company.^[5]

• The sites and pests the product is labeled for.^[3]
• Directions for use, including how much to apply.^[3][4]
• Precautions, including protective equipment, and how to protect people, pets and the environment.^[4][3]
• How to store the product safely, and first aid instructions and emergency phone numbers.^[4]

The front panel: name, ingredients and registration number

• Brand name: the manufacturer's name for the product. Different companies sell products with the same active ingredient under different names, and products with the same active ingredient can be registered for different uses, so the name alone doesn't tell you what you can do with it.^[15][16]
• Product type: a short line under the name saying in general terms what it controls, for example an insecticide for certain insects on fruits, nuts and ornamentals.^[15]
• Ingredient statement: each active ingredient by its common or chemical name and its percentage. Inert ingredients (solvents, carriers, propellants and the like) don't have to be named, but their total percentage does. Inerts don't control pests but can still be hazardous if mishandled.^[15][17][16]
• Shopping by active ingredient: extension and garden articles often name the active ingredient rather than a brand. Many different products contain the same one, so buy by the ingredient and then check that the label lists your plant or site.^[17]
• EPA Reg. No.: shows the product is registered with EPA and its label was approved. The number is a company number, a dash, then the product number. You can use it to look up the product, and it is the key identifier emergency responders use after a spill or exposure.^[15][13][16]
• EPA Est. No.: identifies the facility that made the product.^[15][13]
• No EPA registration number? Some products qualify as minimum risk pesticides, which EPA exempts from federal registration. States may still require them to be registered.^[14]
• RESTRICTED USE PESTICIDE: if a product is restricted use, the first page says so. These pose higher risk to people or the environment and can only be bought and used by licensed applicators.^[16][17]
• "Keep Out of Reach of Children" is required on the front panel of nearly every pesticide label, whatever its toxicity, next to the signal word.^[7][15]

Signal words

The signal word describes the product's short-term (acute) toxicity and must appear on the front panel in capital letters. DANGER products are highly toxic by at least one route or corrosive to skin or eyes; if highly toxic when swallowed, absorbed or inhaled, the label also says POISON in red.^[2]

Products in the lowest toxicity category by every route of exposure are not required to show a signal word.^[2]

The signal word comes from lab tests on the product as sold: swallowing, breathing it in, skin contact, and eye and skin irritation. The worst result sets the word. NPIC's example is a product with low toxicity when eaten, moderate when inhaled and high on the skin, which gets DANGER because of the skin result.^[2][7]

• CAUTION: slightly toxic if eaten, absorbed through the skin or inhaled, or causes slight eye or skin irritation.^[2][17]
• WARNING: moderately toxic by those routes, or causes moderate eye or skin irritation.^[2][17]
• DANGER on its own usually means corrosive: the product can cause irreversible eye damage or severe skin injury. WSU Extension notes that few home and garden pesticides carry it.^[17][2]
• DANGER with POISON and a skull and crossbones: highly toxic if swallowed, absorbed through the skin or inhaled. EPA requires POISON and the symbol for products in the top toxicity category by any of those three routes, with POISON in red. WSU says very few home and garden products carry it, and most that do are rodenticides.^[7][17][2]
• For scale, NPIC's table puts a product in the top category if an oral dose of 50 mg/kg or less killed half the test animals; CAUTION covers greater than 500 through 5000 mg/kg. Smaller numbers mean more toxic.^[2]
• The signal word reflects short-term toxicity only. NPIC points out that any product can poison at a high enough dose, and suggests using the signal word to pick the least toxic product that will still do the job.^[2][15]

Precautionary statements and protective equipment

Under "Hazards to Humans and Domestic Animals" the label repeats the signal word and names the routes of exposure most likely to harm you (mouth, skin, lungs or eyes), so you know which parts of your body to protect. It then says how to avoid exposure, such as wearing gloves or eye protection.^[17][16][15]

• The wording tracks the signal word. For swallowing, EPA's typical statements are "Harmful if swallowed" on CAUTION products, "May be fatal if swallowed" on WARNING products and "Fatal if swallowed" on DANGER-POISON products, each followed by an instruction to wash with soap and water after handling and before eating, drinking, chewing gum, using tobacco or using the toilet.^[7]
• The protective equipment listed on the label is the minimum. NPIC suggests you can add more to cut your exposure further.^[3]
• On products sold to homeowners, EPA reviewers can swap professional terms for gear consumers can buy, for example "shoes" instead of "chemical-resistant footwear" or "safety glasses" instead of "protective eyewear".^[7]
• OSU Extension advises always wearing a long-sleeved shirt, pants, safety glasses and closed-toed shoes or chemical-resistant boots when working with pesticides. WSU adds waterproof gloves and a hat, with eye protection for overhead applications. Our protective equipment guide covers each piece.^[16][17]
• Physical or chemical hazards is a separate heading that warns about fire, explosion or chemical reactions the product could cause.^[15][17]

First aid

The first aid section (sometimes headed "Statement of Practical Treatment") says what to do if the product is swallowed, inhaled, or gets on skin or clothing or in the eyes. A "Note to Physician" section, if present, may include antidote information.^[16][17][7]

• EPA requires first aid statements whenever any of the product's acute toxicity results fall in categories I to III. On the most toxic products they go on the front panel; otherwise the front panel should tell you which panel to turn to.^[7]
• EPA's standard wording ends: "Have the product container or label with you when calling a poison control center or doctor, or going for treatment." Extension programs give the same advice.^[7][16][15]
• The Poison Control hotline is 1-800-222-1222.^[15][17]
• Unless you're trained, don't give an exposed person food, drink or medicine unless the label or medical staff tell you to.^[17]

Environmental hazards

This section warns about risks to wildlife, birds, fish, bees, plants and water, and often contains prohibitions you must follow. OSU Extension's example is a product that can't be used within 300 feet of a waterway.^[17][15][16]

• Most outdoor products carry EPA's standard water statement: do not apply directly to water or to areas where surface water is present, and do not contaminate water when disposing of equipment washwater or rinsate.^[8]
• Bee statements: for products very toxic to bees, EPA's model wording is "This product is highly toxic to bees and other pollinating insects", followed by a ban on applying it or letting it drift to blooming crops or weeds while bees are visiting. A less toxic group gets "toxic" or "moderately toxic" wording. Our pollinator guide explains these statements.^[8][17]
• A groundwater advisory means the chemical may leach into groundwater where soils are permeable, especially where the water table is shallow.^[8]
• Some limits on drift, runoff, plant damage and temperature extremes appear in the directions for use rather than this box, so read both.^[17]

Directions for use

This section starts with the statement "It is a violation of Federal law to use this product in a manner inconsistent with its labeling." It tells you which pests the product controls, where it can be used, how to apply it, how much to use, when and how often, how soon a crop can be eaten, and when people and animals can go back into a treated area.^[17][15][10]

• Your pest and your site both have to be listed. Penn State's examples: a product labeled only for termites may not be labeled for fleas, and one labeled for an azalea bed may not be labeled for an annual flower bed.^[15][3]
• Products with similar names can be meant for very different uses, so don't assume one bought for one job can be used for another without checking.^[5]
• Rates: a label may give a range (low for light infestations or young pests, high for heavy ones), a single rate, or different rates for different pests. Using more than the label allows is illegal and can damage plants and kill beneficial organisms.^[17]
• NPIC adds that over-applying wastes money, can harm people, pets and the environment, and may even control the pest less well.^[5]
• The directions also carry maximum rates per application and per year, how often you can reapply, and any limits on weather, time of day or season.^[10][16]
• Some products require you to calibrate your sprayer or spreader so you actually apply the label rate. Our calibration guide and mixing calculator walk through it.^[17]

Re-entry (REI) and preharvest (PHI) intervals

A restricted entry interval (REI) is the time right after an application when no one should enter the treated area. If the label says four hours, keep people out for those first four hours.^[17][9]

• On farm and greenhouse products covered by the Worker Protection Standard, the REI is usually set by toxicity: 12 hours for the lowest categories, 24 hours for category II and 48 hours for category I, with 72 hours for certain organophosphates used in dry areas. Some reduced-risk products qualify for 4 hours.^[9]
• Home and other non-farm products put their entry rules in plain words, often in a "Non-Agricultural Use Requirements" box, for example "Keep children and pets out of the treated area until sprays have dried."^[9]
• If a label states no entry time, WSU Extension says people and pets can go back in once sprays have dried and dusts have settled. NPIC also suggests ventilating treated rooms, and keeping children and pets off lawns until granules have dissolved.^[17][3]
• A preharvest interval (PHI) is the time after an application that lets residues break down before you pick. WSU's example: with a 7-day PHI on apples, wait the full seven days before picking. EPA's label manual says PHIs are given in days or weeks, sometimes crop by crop, such as "BROCCOLI (7-day PHI)".^[17][10]
• Washing produce is still a good idea, but it doesn't replace waiting out the PHI.^[17]

Storage and disposal

The storage and disposal section says how to store the product and what to do with leftovers and the empty container. Keep products in their original containers, out of reach of children and pets; if you throw away the original container, you throw away the information needed in an emergency.^[15][4][5]

• Most labels carry: "Do not contaminate water, food, or feed by storage or disposal."^[12]
• Typical wording on household containers: "Nonrefillable container. Do not reuse or refill this container. If empty: Place in trash or offer for recycling, if available. If partly filled: Call your local solid waste agency for disposal instructions. Never place unused product down any indoor or outdoor drain."^[12]
• Buy only what you need. Leftovers are a storage and disposal risk.^[5][17]
• Never remove the label from a container or use an unlabeled pesticide.^[5]

Words that should make you suspicious

EPA treats claims that a pesticide is safe, harmless, nonpoisonous or nontoxic to people and pets as false or misleading, even with "when used as directed" added. The same goes for statements like "contains all natural ingredients".^[11]

Natural doesn't mean exempt from review. WSU Extension notes that active ingredients from nature and synthetic ones go through the same federally required screening, and the hazards found end up on the label.^[17]

Common questions

What does "the label is the law" mean?

Every pesticide label carries the statement "It is a violation of Federal law to use this product in a manner inconsistent with its labeling." Using it on an unlisted pest or site, at a higher rate, or without the required precautions breaks federal and state law.^[1][17]

Which signal word is the most toxic?

DANGER, and DANGER with POISON and a skull and crossbones is the most toxic of all. WARNING is moderate and CAUTION is the lowest. Some very low toxicity products carry no signal word.^[2][16]

What is the REI on a pesticide label?

The restricted entry interval: how long after an application no one should enter the treated area. If the label lists none, wait until sprays have dried and dusts have settled.^[17][9]

What does PHI mean on a pesticide label?

Preharvest interval: the number of days that must pass between the last application and harvest, so residues can break down. A 7-day PHI means waiting the full seven days before picking.^[17][10]

Can I use more than the label says for a bad infestation?

No. Applying more than the label rate is illegal, can harm people, pets, plants and beneficial organisms, and NPIC says it may control the pest less well. If the label gives a range, use the high end for heavy infestations.^[17][5]

Where do I find what to wear?

In the precautionary statements, usually under "Hazards to Humans and Domestic Animals". That list is the minimum; you can wear more.^[17][3]

Sources

1. U.S. Environmental Protection Agency, “Introduction to Pesticide Labels.” www.epa.gov/pesticide-labels/introduction-pesticide-labels (accessed 2026-11-10)
2. National Pesticide Information Center, “Signal Words Fact Sheet.” npic.orst.edu/factsheets/signalwords.html (accessed 2026-11-10)
3. National Pesticide Information Center, “Minimizing Pesticide Exposures.” npic.orst.edu/health/minexp.html (accessed 2026-11-10)
4. U.S. Environmental Protection Agency, “Read the Label First: Protect Your Pets.” www.epa.gov/pets/read-label-first-protect-your-pets (accessed 2026-11-10)
5. National Pesticide Information Center, “Reading Pesticide Labels.” npic.orst.edu/health/readlabel.html (accessed 2026-11-10)
6. U.S. Environmental Protection Agency, “Label Review Manual, Chapter 3: General Labeling Requirements.” www.epa.gov/sites/default/files/2018-04/documents/chap-03-mar-2018_1.pdf (accessed 2026-11-10)
7. U.S. Environmental Protection Agency, “Label Review Manual, Chapter 7: Precautionary Statements.” www.epa.gov/sites/default/files/2018-04/documents/chap-07-mar-2018.pdf (accessed 2026-11-10)
8. U.S. Environmental Protection Agency, “Label Review Manual, Chapter 8: Environmental Hazards.” www.epa.gov/sites/default/files/2015-03/documents/chap-08-sep-2012.pdf (accessed 2026-11-10)
9. U.S. Environmental Protection Agency, “Label Review Manual, Chapter 10: Worker Protection Labeling.” www.epa.gov/sites/default/files/2016-02/documents/chap-10-feb-2016.pdf (accessed 2026-11-10)
10. U.S. Environmental Protection Agency, “Label Review Manual, Chapter 11: Directions for Use.” www.epa.gov/system/files/documents/2024-12/lrm-chapter11_2024.pdf (accessed 2026-11-10)
11. U.S. Environmental Protection Agency, “Label Review Manual, Chapter 12: Labeling Claims.” www.epa.gov/sites/default/files/2017-10/documents/chap-12-nov-2013.pdf (accessed 2026-11-10)
12. U.S. Environmental Protection Agency, “Label Review Manual, Chapter 13: Storage and Disposal.” www.epa.gov/sites/default/files/2017-10/documents/chap-13-jul-2013.pdf (accessed 2026-11-10)
13. U.S. Environmental Protection Agency, “Label Review Manual, Chapter 14: Identification Numbers.” www.epa.gov/sites/default/files/2015-03/documents/chap-14-nov-2012.pdf (accessed 2026-11-10)
14. U.S. Environmental Protection Agency, “Conditions for Minimum Risk Pesticides.” www.epa.gov/minimum-risk-pesticides/conditions-minimum-risk-pesticides (accessed 2026-11-10)
15. Penn State Extension (Pesticide Education Program), “What You Need to Know about Reading a Pesticide Label.” extension.psu.edu/what-you-need-to-know-about-reading-a-pesticide-label (accessed 2026-11-10)
16. Oregon State University Extension Service, “How to Read a Pesticide Label: A Guide for Small and Beginning Farmers (EM 9410).” extension.oregonstate.edu/catalog/em-9410-how-read-pesticide-label-guide-small-beginning-farmers (accessed 2026-11-10)
17. Washington State University Extension, “Pacific Northwest Gardener's Handbook, Chapter 22: Understanding Pesticides.” extension.wsu.edu/pnw-gardeners-handbook/chapter-22-understanding-pesticides/ (accessed 2026-11-10)