The Indiana Department of Environmental Management (IDEM) recently announced that National Pollutant Discharge Elimination System (NPDES) permits submitted for renewal or modification after January 1, 2019 will include total nitrogen monitoring requirements for sanitary dischargers who have a 1.0 MGD average design flow or greater. With the inclusion of total nitrogen monitoring in NPDES permits, it’s important to understand why nitrogen is being monitored and what is being required by IDEM.
This past September, the City of Monticello Wastewater Treatment Plant (WWTP) was the site of a Lunch and Learn, as well as a comprehensive tour of the new and improved plant that was last upgraded 17 years ago. The event was hosted by the Indiana Water Environment Association Residuals and Resource Recovery Committee and the City's Wastewater Superintendent, Adam Downey. The Lunch and Learn included presentations on the various aspects and details of the improved plant. The included video highlights the day's activities and shows off some of the new improvements.
Public water systems that have elevated nitrates in the water they produce and distribute are required to monitor the levels regularly.
If a nitrate concentration exceeds the maximum contaminant level (MCL), they must perform additional testing and, when the additional testing confirms that the levels are higher than the MCL, must issue a public notice.