On January 2, 2018, Region 10 issued an administrative order on consent ( AOC ) to correct violations of the Clean Water Act by the City of Fairfield, Idaho ( Respondent ). Respondent, which operates a wastewater treatment plant ( Facility ) exceeded its NPDES permit limits for total suspended solids ( TSS ), pH, and biochemical oxygen demand ( BOD ). The Facility discharges annually from March through May and was found to have the same violations year after year. The City's sampling protocols also resulted in unrepresentative and unreliable effluent discharge data. Under the AOC, Respondent agreed to a timeline to study the cause of the effluent exceedances, conduct a sampling plan, and select and implement a course of action to eliminate effluent limit exceedances. Compliance with the Order will eliminate future discharges to waters of the U.S. in quantities greater than allowed by the permit.