Figure 9: Map of wastewater disposal in Lower Rio Grande Valley colonias (data from CHIPS 2007). According to CHIPS, problems with wastewater disposal are concentrated in Starr County, where most colonias settlements appear to have only partial access to adequate wastewater disposal (shown as orange). Across Hidalgo and Cameron Counties, access to wastewater disposal is more unequally distributed. In these two counties, colonias are marked as having either adequate wastewater or no wastewater disposal at all. This clear divide between ``served'' and ``unserved'' begins to suggest different approaches to colonias utilities improvement at the county level.