Northwest Wastewater Treatment Plant
St Augustine, FL · St. Johns County · Publicly Owned Treatment Works
- Average flow
- 2.6 MGD
- Design flow
- 3 MGD
- NPDES permit
- FL0670651
- Effective
- Permit expires
- December 2026
- Population served
- 58,355
- CWNS 2022
Northwest Wastewater Treatment Plant is a publicly owned wastewater treatment works in St Augustine, St. Johns County, Florida treating an average of 2.6 million gallons per day against a permitted design capacity of 3 MGD, serving about 58,355 residents. Treatment on site includes clarifiers, uncovered lagoons, biological treatment, other, disinfection, uv, screening. It discharges under NPDES permit FL0670651 (effective), which expires in December 2026, with 69 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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Uncovered lagoons
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Biological Treatment, Other
unit processDisinfection, UV
unit processScreening
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Compliance snapshot (last 3 years)
- Total violations
- 69
- Effluent violations
- 13
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
5 verified contacts for Northwest 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 Northwest Wastewater Treatment Plant, plus the full compliance history and discharge data.
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Jacksonville · 12 mi away
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Green Cove Springs · 12 mi away
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Elkton · 13 mi away
—
Hastings · 18 mi away
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Ponte Vedra Beach · 19 mi away
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Orange Park · 19 mi away
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Northwest 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 March 27, 2025.