Sanitary sewer overflows (SSOs) contribute pathogens, nutrients and other contaminants to surface waters across the state. According to the MD Dept. of Environment, between 2005-2015, more than 9,000 SSOs discharged approximately 900 million gallons of raw untreated sewage into MD streams. Of these, 40% were reported to be caused by blockages of grease, rags, trash. We developed a social marketing campaign to encourage proper disposal of household grease and baby wipes in order to reduce this preventable pollution problem. Our campaign focused on the use of a pledge drive conducted at churches and food pantries in the City of Baltimore. In the first year of the campaign, 729 people pledged to properly dispose of grease and wipes. Results of our formative research and campaign suggest that grease disposal is an easier behavior to influence that wipes disposal.