St Vrain Sanitation District
6501 Weld Cr 26, City Of Longmont, CO 80504 · Weld County · Publicly Owned Treatment Works
- Average flow
- 3.34 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 3.34 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 4 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in September 2025.
Treatment technology
Treatment structures and unit processes at St Vrain Sanitation District.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 4
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for St Vrain Sanitation District in EPA's ICIS system.
- Formal actions
- 1
- 1 since FY2020
- Penalties assessed
- $3,000
- all cases
- EPA inspections
- 0
- none on record
Latest case · Sep 2025
St.Vrain Biosolids ESA CWA 309G2E AO For Class I Penalties - Biosolids Expedited Settlement Program
Administrative order · CWA, NPDES Permit Violations · Final Order With Penalty · Penalty $3,000
EPA's description of the case:
“Facility generates Class A biosolids for public sale. The biosolids did not meet the requirements of 503.”
Source: EPA ECHO, civil enforcement case 07-2025-0092.
Full case history with a free Klarifi account
Every action against St Vrain Sanitation District with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
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
0.23 MGD
Berthoud · 10 mi away
1.36 MGD
Fort Lupton · 10 mi away
3.02 MGD
Brighton · 11 mi away
3.11 MGD
Lafayette · 12 mi away
2.39 MGD
Milliken · 14 mi away
0.46 MGD
Louisville · 15 mi away
2.34 MGD
Westminster · 16 mi away
6.94 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 October 26, 2026; facility record last updated December 19, 2024.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Ozonation · Activated sludge · all terms