Marsing WWTP
E 1st St N, Marsing, ID 83639 · Owyhee County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.3 MGD
- NPDES permit
- ID0021202
- Administratively continued
- Permit expires
- October 2020
- Population served
- 11,229
- CWNS 2022
Marsing WWTP is a publicly owned wastewater treatment works in Marsing, Owyhee County, Idaho, serving about 11,229 residents. It discharges under NPDES permit ID0021202 (administratively continued), which expires in October 2020, with 8 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in June 2007.
Treatment technology
3 treatment structures and unit processes identified at Marsing WWTP.
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See the full treatment train at Marsing WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 8
- Effluent violations
- 7
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 Marsing WWTP in EPA's ICIS system.
- Formal actions
- 1
- 0 since FY2020
- Penalties assessed
- $3,500
- all cases
- Compliance actions
- $600,000
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Jun 2007
CITY OF MARSING
Administrative order · CWA, NPDES Permit Violations · Final Order With Penalty · Penalty $3,500 · Compliance actions $600,000
EPA's description of the case:
“Region issued the City a OTC letter for effluent violations of the NPDES permit. The parameters in violation were BOD, BOD % removal, TSS, TSS % removal, TRC, and E.Coli bacteria which occurred…”
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Source: EPA ECHO, civil enforcement case 10-2007-0108.
Full case history with a free Klarifi account
Every action against Marsing WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
4 verified contacts for Marsing WWTP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Marsing WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Idaho
Greenleaf · 9 mi away
0.06 MGD
Homedale · 10 mi away
0.25 MGD
Wilder · 10 mi away
0.11 MGD
Nampa · 12 mi away
10.69 MGD
Notus · 12 mi away
0.06 MGD
Parma · 18 mi away
0.18 MGD
Star · 18 mi away
1.52 MGD
Meridian · 19 mi away
1.3 MGD
Marsing 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 February 9, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · WWTP · Biosolids · all terms