In Texas, colonia refers to a residential area along the Texas-Mexico border that lacks basic infrastructure such as water and sewer systems, electricity, paved roads, and safe and sanitary housing. There are more than 1,400 recognized colonias in Texas.
typically, a residential area lacking some basic infrastructure like a drinking water supply, sewage treatment, paved roads, adequate drainage, etc. "Colonia" is a Spanish word for neighborhood.
an unincorporated settlement, lacking a safe water supply and waste water treatment