September 25, 2022

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Regulatory Update: Missouri's Domestic and Industrial Wastewater Treatment Plants Total Phosphorus Discharges

In August 2023, the Missouri Department of Natural Resources will impose a new rule (10 CSR 7.015(9)(B)2) for major wastewater treatment plants (WWTPs) with phosphorus discharges.

Additional treatment may be necessary to meet the new total phosphorus limit of 1 mg/L as an annual average based on the design flow. Alternatively, the WWTP can achieve an overall reduction of influent total phosphorus concentration of 75 percent. Combined sewer systems have the option to request alternative considerations if an operating permit exists.

This update may raise some important questions for you

                                                                    
  • What are the new total phosphorus limits?
  • Why is Missouri adopting these new discharge limits?
  • What is the implementation schedule?
  • What are the options for compliance?
  • How can Geosyntec help with adaptation to the new rules?

Read Geosyntec's summary on the rule and see our suggestions for first steps. Download the file now.

For a consultation or more info, contact our experts:

Adrienne Nemura, P.E., Principal

This email address is being protected from spambots. You need JavaScript enabled to view it. | (734) 476-0357
Adrienne is a water resources engineer who helps municipalities, industries, and other stakeholders implement and comply with all facets of the Clean Water Act. For 37 years, she has helped clients put discharges in context with other sources and identify cost-effective and sustainable solutions to meet surface-water-quality goals. She models the effects of nutrients on water quality, develops new and revised water quality criteria, conducts National Pollutant Discharge Elimination System (NPDES) permitting, and helps clients manage watersheds.

Nicholas Muenks, Principal

This email address is being protected from spambots. You need JavaScript enabled to view it. | (573) 499-5447
Nick offers clients 21 years of experience addressing many aspects of surface-water-quality. He provides water quality regulatory and monitoring support to municipal, utility, and industrial clients throughout the Midwest and works on local and national projects to evaluate the role of human actions on water quality. He routinely manages regulatory support and water quality monitoring projects to help clients understand and address the complex interactions of surface waters and their surrounding environments.

Nigel Pickering, PhD., P.E., Senior Engineer

This email address is being protected from spambots. You need JavaScript enabled to view it. | (612) 253-8214
Nigel is an agricultural engineer who specializes in water resources and who brings 30 years of diverse experience in the academic, nonprofit, and consulting worlds. He guides clients on watershed monitoring and modeling, water resources planning, stormwater design, and modeling, crop modeling, and flooding and climate change. In addition, Nigel codeveloped a USEPA-approved watershed assessment model and a field-scale model for phosphorus losses from agricultural fields.

Rishab Mahajan, P.E., CFM, CPSWQ, Senior Engineer

This email address is being protected from spambots. You need JavaScript enabled to view it. | (630) 203-3361
A water resources engineer, Rishab provides numerical modeling and data analyses to help clients find affordable and effective solutions to their regulatory obligations. For more than 14 years, he has crafted and calibrated watershed and surface-water models and developed nutrient criteria to meet client goals. To guide other practitioners, Rishab recently coauthored a Water Environment Federation Manual entitled "Stormwater, Watershed, and Receiving Water Quality Modeling."