Who should be responsible for monitoring the water and sanitation projects?

I am working in rural areas in water and sanitation projects. I am in dilemma that who should monitor the project? should it be a same NGO implementing it or should it be Govt? Some time I feel we NGO workers while reporting the truth are little biases as we have to show that we are creating some changes in the field where we work. May be thats what I think but reviews of all members are welcome.