Granville treatment plant exceeds discharge limit

October 28, 2026

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Granville STP in LaSalle County is in significant non-compliance for exceeding its monthly average discharge limit for at least one pollutant.¹ Facilities violating monthly average limits are releasing treated wastewater above permitted concentrations and must correct the exceedance immediately; a violation that persists signals inadequate treatment capacity or process control.¹

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1. EPA ECHO

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