There are a few potential risks associated with using essential oils diluted with water, but the majority of them are minor. The most common risk is adverse reactions to the plant oil itself. If you’re diluting your oil with too much water, it may not be effective in treating your condition and could even lead to irritation or toxicity. Additionally, if you’re using an undiluted essential oil for internal use (such as culinary purposes), it may cause skin irritations or other health problems. The second major risk is poor quality control when making these blends. Not all plants contain the same predominant compounds, so mixing different types of oils together can result in unwanted side effects such as nausea or vomiting.