That farmers have been allegedly wrapping apples in pesticide coated wrapping paper to protect crops. As Shandong is the leading exporter of apples in China, it is against the law to use that technique.
It argues of the need to protect the fruit via pesticides. And it highlights media reports that these types of wrapping have been found within the city.
Although it is against the law, there seems to be no guarantee that consumers will not end up with tainted apples due to the expanse of the sector. In this instance you as the consumer are simply not in control of the safety of these apples for consumption.
Your best bet is to stop eating apples all together, as we simply not aware of the truth. These apples may or may not be infected and due to the wide expanse of food export networks, it stands a good chance of settling on your plate.
Conversely, a blog post from Rural Renewable Energies for Farmers highlights an uncomplicated method to purify and disinfect water using Ultraviolet (UVA) rays in as little as 6 hours rather than using chemicals or other scientific methods.
Water is not consumable due to bacteria and viruses, toxic minerals and metals as well as deposits or particles in suspension (i.e. mud) In this example, rather than abstaining from consuming water (which is highly unadvised) you are entirely able to ensure it is safe for consumption.
Ensuring food safety is a difficult topic within the agri sector as these two examples have shown. However we can gather that each situation is different. It depends on you to be vigilant and ensure your own health and food safety.
At the stage of consumption within your household there are many steps that you can take to prevent or reduce the risk associated with food consumption, especially if you are unaware of its origin. http://homefoodsafety.org/ provides further details.