I would ask the local growers what they use on their crops. Many do not use pesticides or chemical fertilizers, and are happy to answer your questions, especially if you buy at a farmer's market. The people are usually proud of their product and will gladly give you information.
To be certified organic is very expensive, and many small growers cannot afford the certification. Another consideration is that in getting the certification the grower must agree to allow government officials onto their property at any time, and those government people can go just about anywhere on the land that they want to, even inside homes. There are very strict standards and regulations too, a lot of which don't make sense and are just hardships on the farmers.
I was going to do certified organic, but the more I read about it the quicker I decided against it. I even stopped growing extra food to sell. We grow enough for our family and that's it. I don't know what your living situation is, but if you have space I suggest growing your own. I have a black-thumb but can grow most veggies. They are simple, don't take much space to grow at all, and you decide what is safe or not safe to put on your plants. Oh, and it is a lot cheaper than store bought!