Some places to find a schematic of a well water system include CleanWaterStore.com and WaterPumpSupply.com. Both of these websites offer the diagrams and schematics at no cost as of 2016.
At CleanWaterStore.com, there are numerous well water system schematics, including ozone systems, iron filters, ultraviolet sterilizer systems and aeration systems. This website offers an online chat feature to talk to a specialist during business hours for help choosing the correct diagram.
WaterPumpSupply.com provides more than 10 schematics, but not all of them are for well water systems. There are a couple of schematics for battery operated sump pumps, submersible well pumps and shallow well pumps. Builders can send questions to the company and receive answers back by email.