Thank you for your question. The answer is ABSOLUTELY NONE.
Your question represents one major concern of most people who hear "pouring acidic water on the plants", because it gives an image like pouring hydrochloric acid on the plant.
The amount of electron is the biggest difference between drinkable faucet water and acidic water produced by electrolysis. Acidic water is just the regular water in a stage of extreme lacking of electron. (To be precise, chlorine content is probably 0.1ppm higher than faucet water, pottasium ions and also low level of HClO are included.)
Because of lacking of electron, acidic water takes electrons away from anything it touches, and turn into just a regular water. Since the energy source of bacteria and viruses is electron, they die very quickly (within 30 sec.) when their electrons are taken away. This is why acidic water is absolutely non-toxic to human, animal and plants (which are covered by thick wall), but a real killer to bacteria and viruses.
This feature, however, limits its effectiveness; i.e. acidic water works only on the surface unless large amount stays at one place for extended time. So, it is highly effective to prevent disease from plants, but not effective once disease occurs and goes inside the plant.
The basic concept if EWA is to prevent disease with acidic water, and enhance growth with alkaline water.
I hope I answered your question, and explained the reasons. If not, please ask me more questions.