Approximately 45 US states use the ABC/WPI standardized exam for water and wastewater operator certification. Echelon Institute covers operators in all of these states with content aligned to the 2025 WPI Need-to-Know Criteria.
Iowa (Iowa DNR), Minnesota (MDH), Wisconsin (WI DNR), Michigan (EGLE), Indiana (IDEM), Ohio (Ohio EPA), Missouri (MO DNR), North Dakota (NDDEQ), South Dakota (SD DANR), Nebraska (NDEE), Kansas (KDHE).
Maine (Maine DWP), New Hampshire (NHDES), Vermont (VT DEC), Massachusetts (MassDEP), Rhode Island (RIDOH), Connecticut (CT DPH), New Jersey (NJDEP), Delaware (DNREC), Maryland (MDE), Pennsylvania (PA DEP), West Virginia (WV BPH).
Virginia (VDH), North Carolina (NC DWR), South Carolina (SCDHEC), Georgia (Georgia EPD), Alabama (ADEM), Mississippi (MSDH), Arkansas (ADH), Oklahoma (Oklahoma DEQ), Louisiana (LDH), Kentucky (KY DOW), Tennessee (TDEC).
Washington (WA DOH), Oregon (OHA), Idaho (Idaho DEQ), Montana (Montana DEQ), Wyoming (Wyoming DEQ), Colorado (CDPHE), Utah (Utah DDW), Nevada (NDEP), Arizona (ADEQ), New Mexico (NMED), Alaska (Alaska DEC), Hawaii (Hawaii DOH).
California (SWRCB), Texas (TCEQ), Florida (FDEP), and New York (NYSDOH) use their own state-specific exam systems rather than the ABC/WPI standardized exam. Echelon does not currently offer prep for these state-specific exams.