Metropolitan St Louis Sewer District-Grand Glaize Wastewater Treatment Plant
Valley Park, MO · St. Louis County · Publicly Owned Treatment Works
- Average flow
- 10.4 MGD
- Design flow
- —
- NPDES permit
- MO0101362
- Effective
- Permit expires
- August 2031
- Population served
- 113,693
- CWNS 2022
Metropolitan St Louis Sewer District-Grand Glaize Wastewater Treatment Plant is a publicly owned wastewater treatment works in Valley Park, St. Louis County, Missouri treating an average of 10.4 million gallons per day, serving about 113,693 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches, biogas silos, biological treatment, other, biosolids thickening and other unit processes. It discharges under NPDES permit MO0101362 (effective), which expires in August 2031, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Carrousels / oxidation ditches
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Biogas silos
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Biological Treatment, Other
unit processBiosolids Thickening
unit processDechlorination
unit processDisinfection, chlorine/ chloramine
unit processFlow Equalization
unit processScreening
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Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Metropolitan St Louis Sewer District-Grand Glaize Wastewater Treatment Plant, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Metropolitan St Louis Sewer District-Grand Glaize Wastewater Treatment Plant, plus the full compliance history and discharge data.
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Fenton · 5 mi away
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Fenton · 6 mi away
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High Ridge · 6 mi away
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High Ridge · 9 mi away
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Eureka · 9 mi away
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House Springs · 10 mi away
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House Springs · 10 mi away
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Metropolitan St Louis Sewer District-Grand Glaize Wastewater Treatment Plant: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated April 24, 2025.