Table 1.
Location and main sources of pollution of the 30 sampling locations studied.
| Sample no. | Sample locations | aMain source of pollution | bType of sampling location |
|---|---|---|---|
| 1 | San Pedro River. Las Animas. | Urban runoff | UR |
| 2 | San Pedro River. FREASA | Slaughterhouse | S |
| 3 | San Pedro River. FREASA-PT. | Wastewater treatment plant effluent | WWTP-E |
| 4 | San Pedro River. San Antonio de los Horcones. | Open space | OS |
| 5 | San Pedro River. Rastro municipal de Jesus Maria. | Slaughterhouse | S |
| 6 | San Pedro River. Los Ramiez-Los Vasquez. | Human sewage + wastewater discharge | UR |
| 7 | Chicalote Creek. Jaltomate. | Urban runoff | UR |
| 8 | Chicalote Creek. El Becerro II. | Agricultural + farm | F |
| 9 | Chicalote Creek. El Becerro I. | Agricultural + farm | F |
| 10 | Chicalote Creek. Cañada Honda I. | Urban runoff | UR |
| 11 | Chicalote Creek. Cañada Honda II. | Open space | OS |
| 12 | Chicalote Creek. Loretito. | Open Space | OS |
| 13 | San Pedro-Chicalote River. Confluencia PIVA-Chicalote-Gomez Portugal. | Urban runoff + agricultural + wastewater + industrial sewage | IS |
| 14 | Chicalote Creek. Gomez Portugal - Area oeste. | Urban runoff + agricultural + wastewater | UR |
| 15 | Chicalote Creek. Gomez Portugal. | Agricultural + slaughterhouse | S |
| 16 | Chicalote Creek. Reserva Brandy. | Urban runoff + agricultural | AR |
| 17 | San Pedro-Chicalote River. Confluencia PIVA-Chicalote. | Urban runoff + agricultural + wastewater + industrial sewage + slaughterhouses | IS |
| 18 | Chicalote Creek. La Florida I. | Agricultural + farm | F |
| 19 | Chicalote Creek. La Florida II. | Agricultural + farm | F |
| 20 | San Pedro River-Chicalote Creek. | Open space | OS |
| 21 | San Pedro River. Paso Blanco. | Agricultural | AR |
| 22 | San Pedro River. Tepetate-San Miguelito. | Open space | OS |
| 23 | San Pedro River. Canal interceptor. | Urban runoff + wastewater discharge + industrial sewage | IS |
| 24 | San Pedro River. Puente Curtidores. | Urban runoff + wastewater discharge | UR |
| 25 | Morcinique Creek. Los Arquitos. | Urban runoff + agricultural + wastewater | UR |
| 26 | Morcinique. Los Negritos primera seccion. | Slaughterhouse | S |
| 27 | San Pedro River-Morcinique Creek. Aguascalientes Lopez Portillo. | Urban runoff | UR |
| 28 | San Pedro River-San Francisco Creek. | Open space | OS |
| 29 | San Pedro River-San Francisco Creek. Puente Bonaterra. | Industrial sewage | IS |
| 30 | San Pedro River. Fatima. | Agricultural + farm + human sewage | F |
a
Main source of pollution of location was determined based on the presence of discharge nearby and the type of land activity.
b
AR, agriculturally impaired; F, farm; IS, industrial sewage; OS, open spaces; S, slaughterhouse; UR, urban runoff; WWTP-E, wastewater treatment plant effluent.