La Conner STP
Mount Vernon, WA · Skagit County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- WA0022446
- Administratively continued
- Permit expires
- February 2024
- Population served
- 1,013
- CWNS 2022
La Conner STP is a publicly owned wastewater treatment works in Mount Vernon, Skagit County, Washington, serving about 1,013 residents. Treatment on site includes clarifiers, uncovered lagoons, carrousels / oxidation ditches. It discharges under NPDES permit WA0022446 (administratively continued), which expires in February 2024, with 9 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
Unlock
Uncovered lagoons
Unlock
Carrousels / oxidation ditches
Unlock
Unlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 9
- Effluent violations
- 9
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
1 verified contact for La Conner STP, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at La Conner STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Washington
Burlington · 9 mi away
—
Mount Vernon · 11 mi away
—
Stanwood · 12 mi away
—
Sedro-Woolley · 14 mi away
—
Lopez Island · 22 mi away
—
Port Townsend · 22 mi away
—
Marysville · 26 mi away
0.17 MGD
Bellingham · 28 mi away
0.07 MGD
La Conner STP: 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 8, 2025.