Wa Dnr Larch Mountain Corr
15314 NE Dole Valley Rd, Yacolt, WA 98675 · Clark County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- WAR314494
- Effective
- Permit expires
- December 2030
- Population served
- —
- CWNS 2022
Wa Dnr Larch Mountain Corr is a publicly owned wastewater treatment plant in Yacolt, Clark County, Washington. It discharges under NPDES permit WAR314494 (effective), which expires in December 2030, with 4 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Wa Dnr Larch Mountain Corr.
Available with a free Klarifi account
See the full treatment train at Wa Dnr Larch Mountain Corr: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 4
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
3 verified contacts for Wa Dnr Larch Mountain Corr, with validated emails and direct phone numbers.
Unlock 3 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Wa Dnr Larch Mountain Corr, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Washington
Washougal · 11 mi away
1.09 MGD
La Center · 18 mi away
0.31 MGD
Vancouver · 19 mi away
—
North Bonneville · 19 mi away
0.07 MGD
Ridgefield · 20 mi away
0.37 MGD
Stevenson · 22 mi away
0.31 MGD
Kalama · 31 mi away
0.49 MGD
Longview · 38 mi away
17.43 MGD
Wa Dnr Larch Mountain Corr: 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 April 13, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Oxidation ditch · Anaerobic digester · all terms