Big Lake WWTP
Mount Vernon, WA · Skagit County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- WA0030597
- Administratively continued
- Permit expires
- February 2026
- Population served
- 2,101
- CWNS 2022
Big Lake WWTP is a publicly owned wastewater treatment works in Mount Vernon, Skagit County, Washington, serving about 2,101 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit WA0030597 (administratively continued), which expires in February 2026, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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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.
Capital improvement projects in Mount Vernon
Mount Vernon's capital improvement plan lists 5 water, sewer and wastewater line items worth $5M starting 2024–2026. The largest budgeted items are shown here.
All water and sewer capital projects in Mount Vernon →
| Project | Budget | Years |
|---|---|---|
| Sewer Restoration Program | $3,000,000 | 2024–2029 |
| Combined Sewer System Improvements | $750,000 | 2026–2026 |
| Wastewater Treatment Plant Upgrades | $600,000 | 2024–2029 |
| Sewer Extensions to Non-Sewered Parcels | $100,000 | 2026–2026 |
| Sewer Collection System Expansion | $60,000 | 2026–2026 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
Decision-makers at Big Lake WWTP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Washington
Burlington · 6 mi away
—
Sedro-Woolley · 7 mi away
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Mount Vernon · 11 mi away
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Stanwood · 12 mi away
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Marysville · 24 mi away
0.17 MGD
Granite Falls · 25 mi away
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Port Townsend · 31 mi away
—
Bellingham · 32 mi away
0.07 MGD
Big Lake WWTP: 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 November 20, 2025.