Figure 2. Map of Knights Landing Environmental Health Survey recruitment zones.

Promotora-researchers designated geographic zones to represent the sub-populations of Knights Landing. The downtown residential area (D) which covers the Knights Landing Census Designated Place (US Census Bureau 2017) was split along major roads to include quadrants of approximately equal numbers of residents. The periphery zones (P) include a migrant farm-worker labor camp, trailer homes, and farmhouses considered to be underrepresented subpopulations. Representative map was rendered using ArcGIS Online.