I think it is worthwhile for any grower who is concerned about the use of potentially toxic chemicals or non-sustainable practices to browse the copious documents available from the USDA on the National Organic Program site (link in FmGrowit's post, above).
If you diligently follow the "organic" standards, but transact less than $5,000 per year in organic produce sales, then you can actually label your product as "Organic" (which is now a legally qualified term, rather than a description of your practices) WITHOUT needing to pay for inspections, chemical residue tests and the cost of formal "Organic" certification.
If, on the other hand, you label your product as "Organic," and have failed to meet the federal standards for certification, regardless of whether or not you are required to formally obtain certification, then you may be subject to a penalty of $11,000 per individual violation. Nasty business.
Most small growers of agricultural products that are raised chemical-free, and in a sustainable and healthy manner simply avoid the onerous governmental costs and threats by labeling their products using any descriptive term other than "organic." So, labels such as "pesticide-free," "chemical-free," "natural," "sustainably-grown," etc. are yours to use as your conscience allows. The term "organic" is owned by the government, and subject to their jurisdiction.
Bob