If you farm near an injection well in Ohio where they dump frack waste water, you might try this

The ideas described in this video will not hold up in court against a polluter should your well water be contaminated by frack waste, but this technique – and working with your neighbors – could give you an affordable way to track one aspect of water quality. An increase in the level of chlorides in your water over time could be the canary in the coal mine telling you to get professional testing done.