The Mass Rural Water Association (MassRWA) is a non-profit trade association of rural water and wastewater systems. We are a nationally recognized Rural Water Association and the preferred provider of training and on-site technical assistance for small systems in Massachusetts. - Provide quality services to your customers - Promote professionalism among water and wastewater personnel - Represent the rural water and wastewater industry in legislative issues Contact our staff for more information. Mass Rural Water Association is a State Affiliate of the National Rural Water Association.