Residents of Toolville have discovered dangerous concentrations of nitrates in their water supply, because of the fertilizers in runoff from irrigating surrounding farms. Toolville is a colonia, or unincorporated and informal settlement of over 100 families in the rural San Joaquin Valley. They have to buy bottled water for drinking and cooking. Valeria Alvarado is a Mixtex immigrant from Oaxaca, and lives in a trailer in Toolville with her husband, son and three daughters. She is a leader of the community's effort to gain safe drinking water.