Culdesac WWTP
N Main St, Culdesac, ID 83524 · Nez Perce County · Publicly Owned Treatment Works
- Average flow
- 0.06 MGD
- Design flow
- 0.06 MGD
- NPDES permit
- ID0024490
- Effective
- Permit expires
- September 2028
- Population served
- 413
- CWNS 2022
Culdesac WWTP is a publicly owned wastewater treatment works in Culdesac, Nez Perce County, Idaho treating an average of 0.06 million gallons per day against a permitted design capacity of 0.06 MGD, serving about 413 residents. It discharges under NPDES permit ID0024490 (effective), which expires in September 2028, with 58 recorded violations in the last three years. EPA has recorded 2 formal enforcement actions naming the plant, the latest in October 2016.
Treatment technology
One treatment structure or unit process identified at Culdesac WWTP.
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See the full treatment train at Culdesac WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 58
- Effluent violations
- 11
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 Culdesac WWTP in EPA's ICIS system.
- Formal actions
- 2
- 0 since FY2020
- Penalties assessed
- $1,000
- all cases
- Compliance actions
- $800
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Oct 2016
CITY OF CULDESAC, IDAHO - WASTEWATER TREATMENT FACILITY
Administrative order · CWA, NPDES Permit Violations · Final Order No Penalty
EPA's description of the case:
“Pursuant to Section 309(a) of the Clean Water Act, EPA Region 10 has issued a compliance order to the City of Culdesac, Idaho (City) for violations of the Citys NPDES permit (Permit Number…”
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Source: EPA ECHO, civil enforcement case 10-2012-0082.
Full case history with a free Klarifi account
Every action against Culdesac WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
1 verified contact for Culdesac WWTP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Culdesac WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Idaho
Winchester · 10 mi away
0.01 MGD
Juliaetta · 13 mi away
0.03 MGD
Craigmont · 15 mi away
0.3 MGD
Kendrick · 16 mi away
0.03 MGD
Lewiston · 17 mi away
3.36 MGD
Genesee · 17 mi away
—
Genesee · 17 mi away
0.3 MGD
Orofino · 19 mi away
0.28 MGD
Culdesac 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 October 26, 2026; facility record last updated November 5, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biosolids · Filter press · all terms