Is that organic food free of chemicals?

Everyone is on the organic bandwagon, and I understand the reasoning, but people are also assuming that organic means chemical free, and sorry but that just is not the case. Generally they can use natural chemicals, and even a few synthetics. This list is from the US governments website listing allowed synthetics. Also keep in mind that not all organic farms will use this stuff, the big corporate ones may (if it means more money they will do it, a small farm is less likely since they are eating it too). Anyway here's the list :

§ 205.601   Synthetic substances allowed for use in organic crop production.

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In accordance with restrictions specified in this section, the following synthetic substances may be used in organic crop production: Provided, That, use of such substances do not contribute to contamination of crops, soil, or water. Substances allowed by this section, except disinfectants and sanitizers in paragraph (a) and those substances in paragraphs (c), (j), (k), and (l) of this section, may only be used when the provisions set forth in §205.206(a) through (d) prove insufficient to prevent or control the target pest.
(a) As algicide, disinfectants, and sanitizer, including irrigation system cleaning systems.
(1) Alcohols.
(i) Ethanol.
(ii) Isopropanol.
(2) Chlorine materials— Except, That, residual chlorine levels in the water shall not exceed the maximum residual disinfectant limit under the Safe Drinking Water Act.
(i) Calcium hypochlorite.
(ii) Chlorine dioxide.
(iii) Sodium hypochlorite.
(3) Copper sulfate—for use as an algicide in aquatic rice systems, is limited to one application per field during any 24-month period. Application rates are limited to those which do not increase baseline soil test values for copper over a timeframe agreed upon by the producer and accredited certifying agent.
(4) Hydrogen peroxide.
(5) Ozone gas—for use as an irrigation system cleaner only.
(6) Peracetic acid—for use in disinfecting equipment, seed, and asexually propagated planting material.
(7) Soap-based algicide/demossers.
(8) Sodium carbonate peroxyhydrate (CAS #–15630–89–4)—Federal law restricts the use of this substance in food crop production to approved food uses identified on the product label.
(b) As herbicides, weed barriers, as applicable.
(1) Herbicides, soap-based—for use in farmstead maintenance (roadways, ditches, right of ways, building perimeters) and ornamental crops.
(2) Mulches.
(i) Newspaper or other recycled paper, without glossy or colored inks.
(ii) Plastic mulch and covers (petroleum-based other than polyvinyl chloride (PVC)).
(c) As compost feedstocks—Newspapers or other recycled paper, without glossy or colored inks.
(d) As animal repellents—Soaps, ammonium—for use as a large animal repellant only, no contact with soil or edible portion of crop.
(e) As insecticides (including acaricides or mite control).
(1) Ammonium carbonate—for use as bait in insect traps only, no direct contact with crop or soil.
(2) Aqueous potassium silicate (CAS #–1312–76–1)—the silica, used in the manufacture of potassium silicate, must be sourced from naturally occurring sand.
(3) Boric acid—structural pest control, no direct contact with organic food or crops.
(4) Copper sulfate—for use as tadpole shrimp control in aquatic rice production, is limited to one application per field during any 24-month period. Application rates are limited to levels which do not increase baseline soil test values for copper over a timeframe agreed upon by the producer and accredited certifying agent.
(5) Elemental sulfur.
(6) Lime sulfur—including calcium polysulfide.
(7) Oils, horticultural—narrow range oils as dormant, suffocating, and summer oils.
(8) Soaps, insecticidal.
(9) Sticky traps/barriers.
(10) Sucrose octanoate esters (CAS #s—42922–74–7; 58064–47–4)—in accordance with approved labeling.
(f) As insect management. Pheromones.
(g) As rodenticides.
(1) Sulfur dioxide—underground rodent control only (smoke bombs).
(2) Vitamin D₃.
(h) As slug or snail bait. Ferric phosphate (CAS # 10045–86–0).
(i) As plant disease control.
(1) Aqueous potassium silicate (CAS #–1312–76–1)—the silica, used in the manufacture of potassium silicate, must be sourced from naturally occurring sand.
(2) Coppers, fixed—copper hydroxide, copper oxide, copper oxychloride, includes products exempted from EPA tolerance, Provided, That, copper-based materials must be used in a manner that minimizes accumulation in the soil and shall not be used as herbicides.
(3) Copper sulfate—Substance must be used in a manner that minimizes accumulation of copper in the soil.
(4) Hydrated lime.
(5) Hydrogen peroxide.
(6) Lime sulfur.
(7) Oils, horticultural, narrow range oils as dormant, suffocating, and summer oils.
(8) Peracetic acid—for use to control fire blight bacteria.
(9) Potassium bicarbonate.
(10) Elemental sulfur.
(11) Streptomycin, for fire blight control in apples and pears only.
(12) Tetracycline, for fire blight control only and for use only until October 21, 2012.
(j) As plant or soil amendments.
(1) Aquatic plant extracts (other than hydrolyzed)—Extraction process is limited to the use of potassium hydroxide or sodium hydroxide; solvent amount used is limited to that amount necessary for extraction.
(2) Elemental sulfur.
(3) Humic acids—naturally occurring deposits, water and alkali extracts only.
(4) Lignin sulfonate—chelating agent, dust suppressant, floatation agent.
(5) Magnesium sulfate—allowed with a documented soil deficiency.
(6) Micronutrients—not to be used as a defoliant, herbicide, or desiccant. Those made from nitrates or chlorides are not allowed. Soil deficiency must be documented by testing.
(i) Soluble boron products.
(ii) Sulfates, carbonates, oxides, or silicates of zinc, copper, iron, manganese, molybdenum, selenium, and cobalt.
(7) Liquid fish products—can be pH adjusted with sulfuric, citric or phosphoric acid. The amount of acid used shall not exceed the minimum needed to lower the pH to 3.5.
(8) Vitamins, B₁, C, and E.
(9) Sulfurous acid (CAS # 7782–99–2) for on-farm generation of substance utilizing 99% purity elemental sulfur per paragraph (j)(2) of this section.
(k) As plant growth regulators. Ethylene gas—for regulation of pineapple flowering.
(l) As floating agents in postharvest handling.
(1) Lignin sulfonate.
(2) Sodium silicate—for tree fruit and fiber processing.
(m) As synthetic inert ingredients as classified by the Environmental Protection Agency (EPA), for use with nonsynthetic substances or synthetic substances listed in this section and used as an active pesticide ingredient in accordance with any limitations on the use of such substances.
(1) EPA List 4—Inerts of Minimal Concern.
(2) EPA List 3—Inerts of unknown toxicity—for use only in passive pheromone dispensers.
(n) Seed preparations. Hydrogen chloride (CAS # 7647–01–0)—for delinting cotton seed for planting.

Then you have a list of "nonagricultural" things allowed:
The following nonagricultural substances may be used as ingredients in or on processed products labeled as “organic” or “made with organic (specified ingredients or food group(s))” only in accordance with any restrictions specified in this section.
(a) Nonsynthetics allowed:
Acids (Alginic; Citric—produced by microbial fermentation of carbohydrate substances; and Lactic).
Agar-agar.
Animal enzymes—(Rennet—animals derived; Catalase—bovine liver; Animal lipase; Pancreatin; Pepsin; and Trypsin).
Bentonite.
Calcium carbonate.
Calcium chloride.
Calcium sulfate—mined.
Carrageenan.
Dairy cultures.
Diatomaceous earth—food filtering aid only.
Egg white lysozyme (CAS # 9001–63–2)
Enzymes—must be derived from edible, nontoxic plants, nonpathogenic fungi, or nonpathogenic bacteria.
Flavors, nonsynthetic sources only and must not be produced using synthetic solvents and carrier systems or any artificial preservative.
Gellan gum (CAS # 71010–52–1)—high-acyl form only.
Glucono delta-lactone—production by the oxidation of D-glucose with bromine water is prohibited.
Kaolin.
L-Malic acid (CAS # 97–67–6).
Magnesium sulfate, nonsynthetic sources only.
Microorganisms—any food grade bacteria, fungi, and other microorganism.
Nitrogen—oil-free grades.
Oxygen—oil-free grades.
Perlite—for use only as a filter aid in food processing.
Potassium chloride.
Potassium iodide.
Sodium bicarbonate.
Sodium carbonate.
Tartaric acid—made from grape wine.
Waxes—nonsynthetic (Carnauba wax; and Wood resin).
Yeast—nonsynthetic, growth on petrochemical substrate and sulfite waste liquor is prohibited (Autolysate; Bakers; Brewers; Nutritional; and Smoked—nonsynthetic smoke flavoring process must be documented).
(b) Synthetics allowed:
Activated charcoal (CAS #s 7440–44–0; 64365–11–3)—only from vegetative sources; for use only as a filtering aid.
Alginates.
Ammonium bicarbonate—for use only as a leavening agent.
Ammonium carbonate—for use only as a leavening agent.
Ascorbic acid.
Calcium citrate.
Calcium hydroxide.
Calcium phosphates (monobasic, dibasic, and tribasic).
Carbon dioxide.
Cellulose—for use in regenerative casings, as an anti-caking agent (non-chlorine bleached) and filtering aid.
Chlorine materials—disinfecting and sanitizing food contact surfaces, Except, That, residual chlorine levels in the water shall not exceed the maximum residual disinfectant limit under the Safe Drinking Water Act (Calcium hypochlorite; Chlorine dioxide; and Sodium hypochlorite).
Cyclohexylamine (CAS # 108–91–8)—for use only as a boiler water additive for packaging sterilization.
Diethylaminoethanol (CAS # 100–37–8)—for use only as a boiler water additive for packaging sterilization.
Ethylene—allowed for postharvest ripening of tropical fruit and degreening of citrus.
Ferrous sulfate—for iron enrichment or fortification of foods when required by regulation or recommended (independent organization).
Glycerides (mono and di)—for use only in drum drying of food.
Glycerin—produced by hydrolysis of fats and oils.
Hydrogen peroxide.
Lecithin—bleached.
Magnesium carbonate—for use only in agricultural products labeled “made with organic (specified ingredients or food group(s)),” prohibited in agricultural products labeled “organic”.
Magnesium chloride—derived from sea water.
Magnesium stearate—for use only in agricultural products labeled “made with organic (specified ingredients or food group(s)),” prohibited in agricultural products labeled “organic”.
Nutrient vitamins and minerals, in accordance with 21 CFR 104.20, Nutritional Quality Guidelines For Foods.
Octadecylamine (CAS # 124–30–1)—for use only as a boiler water additive for packaging sterilization.
Ozone.
Pectin (low-methoxy).
Peracetic acid/Peroxyacetic acid (CAS # 79–21–0)—for use in wash and/or rinse water according to FDA limitations. For use as a sanitizer on food contact surfaces.
Phosphoric acid—cleaning of food-contact surfaces and equipment only.
Potassium acid tartrate.
Potassium carbonate.
Potassium citrate.
Potassium hydroxide—prohibited for use in lye peeling of fruits and vegetables except when used for peeling peaches during the Individually Quick Frozen (IQF) production process.
Potassium iodide—for use only in agricultural products labeled “made with organic (specified ingredients or food group(s)),” prohibited in agricultural products labeled “organic”.
Potassium phosphate—for use only in agricultural products labeled “made with organic (specific ingredients or food group(s)),” prohibited in agricultural products labeled “organic”.
Silicon dioxide.
Sodium acid pyrophosphate (CAS # 7758–16–9)—for use only as a leavening agent.
Sodium citrate.
Sodium hydroxide—prohibited for use in lye peeling of fruits and vegetables.
Sodium phosphates—for use only in dairy foods.
Sulfur dioxide—for use only in wine labeled “made with organic grapes,” Provided, That, total sulfite concentration does not exceed 100 ppm.
Tartaric acid—made from malic acid.
Tetrasodium pyrophosphate (CAS # 7722–88–5)—for use only in meat analog products.
Tocopherols—derived from vegetable oil when rosemary extracts are not a suitable alternative.
Xanthan gum.
(c)–(z) [Reserved]
[68 FR 61993, Oct. 31, 2003, as amended as 68 FR 62217, Nov. 3, 2003; 71 FR 53302, Sept. 11, 2006; 72 FR 58473, Oct. 16, 2007; 73 FR 59481, Oct. 9, 2008; 75 FR 77524, Dec. 13, 2010]

My opinion is buy local, don't worry so much about organic, there will always be big corporate farms pushing the rules, and finding ways to make healthy, well unhealthy. If you have a local organic farmer, by all means buy from them, they deserve a little extra. Something else to keep in mind is pesticides travel on the wind (ever see a cloud after they spray?) so if an organic farm is close to a no-organic one the pesticides very well are on the produce (although not as much, well unless right next door). I've only touched on the produce side, the livestock side has some regulations too, that I'll try to make a post about tomorrow (if my memory is good enough that is). What I hope this does for you is makes you more aware of what you are buying.