Thank you for all of the ...

Thank you for all of the responses.  In each group of, for example, 125-150 people (let's call these "sub-groups") I plan to have a community water group of 10-15 people.  My organization will work directly with the water groups, and the water groups will convey information to the sub-groups, and convey questions back to us.  The water groups will also help with collecting data and our education program. 

I plan to have the community involved in all aspects of the project.  They will be involved in designing/planning the project, they will provide labor for the project, and they will maintain the project after it is complete.  

They will also help collect data through participatory mapping and surveys.    

Also, there will be an education program to teach the community 1) about the health implications of drinking dirty water and practicing poor sanitation and hygiene, about the specifics of their water and health problems, etc., and 2) once the project is being built, about how the different aspects of the project work. For example, how to use a hygiene station properly to wash their hands.

Let me know if I can give any other information that would help.  With the information given, does 125-150 people per group sound manageable? 

Rafael, thank you for your note on managing different groups.  I may message you separately to talk about this topic.