| ASR | aquifer storage and recovery |
| ASTR | aquifer storage, transfer, and recovery |
| ATW | advanced treated water |
| BLM | Bureau of Land Management |
| CEC | Contaminant of Emerging Concern |
| cfs | cubic feet per second |
| FERC | Federal Energy Regulatory Commission |
| gpm | gallons per minute |
| LID | low impact development |
| MAR | managed aquifer recharge |
| MCL | Maximum Contaminant Level |
| mgd | million gallons per day |
| MIW | mining-influenced waters |
| NGO | nongovernmental organization |
| NMFS | National Marine Fisheries Service |
| NOAA | National Oceanic and Atmospheric Administration |
| OCWD | Orange County Water District |
| OM&M | operations, maintenance, and monitoring |
| PFAS | per- and polyfluoroalkyl substances |
| RI | rapid infiltration |
| TDS | total dissolved solids |
| TOC | total organic carbon |
| TSS | total suspended solids |
| tTEM | towed transient electromagnetic methods |
| UIC | underground injection control |
| USACE | United States Army Corps of Engineers |
| USBR | United States Bureau of Reclamation |
| USFWS | United States Fish and Wildlife Service |
| USDW | underground source of drinking water |
| USEPA | United States Environmental Protection Agency |
