St Vrain Sanitation District
City Of Longmont, CO · Weld County · Publicly Owned Treatment Works
- Average flow
- 3.55 MGD
- Design flow
- 6 MGD
- NPDES permit
- CO0041700
- Administratively continued
- Permit expires
- November 2017
- Population served
- 52,634
- CWNS 2022
St Vrain Sanitation District is a publicly owned wastewater treatment plant in City Of Longmont, Weld County, Colorado treating an average of 3.55 million gallons per day against a permitted design capacity of 6 MGD, serving about 52,634 residents. It discharges under NPDES permit CO0041700 (administratively continued), which expires in November 2017, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Treatment structure data not yet analyzed for this facility.
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
Decision-makers at St Vrain Sanitation District.
No verified contacts on file yet
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Nearby wastewater treatment plants in Colorado
Mead · 5 mi away
0.33 MGD
Berthoud · 10 mi away
1.61 MGD
Fort Lupton · 10 mi away
3.86 MGD
Brighton · 11 mi away
3.65 MGD
Lafayette · 12 mi away
3.03 MGD
Milliken · 14 mi away
0.53 MGD
Louisville · 15 mi away
2.68 MGD
Westminster · 16 mi away
6.9 MGD
St Vrain Sanitation District: 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 December 19, 2024.