Maryville WWTP
Highway 136 East, Maryville, MO 64468 · Nodaway County · Publicly Owned Treatment Works
- Average flow
- 1.09 MGD
- Design flow
- —
- NPDES permit
- MO0033286
- Administratively continued
- Permit expires
- September 2022
- Population served
- 11,641
- CWNS 2022
Maryville WWTP is a publicly owned wastewater treatment works in Maryville, Nodaway County, Missouri treating an average of 1.09 million gallons per day, serving about 11,641 residents. It discharges under NPDES permit MO0033286 (administratively continued), which expires in September 2022, with 15 recorded violations in the last three years. EPA has recorded 2 formal enforcement actions naming the plant, the latest in April 2021.
Treatment technology
6 treatment structures and unit processes identified at Maryville WWTP.
Available with a free Klarifi account
See the full treatment train at Maryville WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 15
- Effluent violations
- 12
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 Maryville WWTP in EPA's ICIS system.
- Formal actions
- 2
- 0 since FY2020
- Penalties assessed
- $20,400
- all cases
- Compliance actions
- $35,000
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Apr 2021
CITY OF MARYVILLE
Administrative order · CWA, NPDES Permit Violations · Final Order No Penalty · Compliance actions $35,000
Source: EPA ECHO, civil enforcement case 07-2009-0141.
Full case history with a free Klarifi account
Every action against Maryville WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
3 verified contacts for Maryville WWTP, with validated emails and direct phone numbers.
Unlock 3 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Maryville WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Missouri
Ravenwood · 8 mi away
0.06 MGD
Pickering · 8 mi away
0.0033 MGD
Barnard · 11 mi away
0.02 MGD
Skidmore · 14 mi away
0.03 MGD
Hopkins · 15 mi away
0.21 MGD
Burlington Junction · 16 mi away
0.01 MGD
Maitland · 16 mi away
0.04 MGD
Clearmont · 16 mi away
0.02 MGD
Maryville 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 12, 2026; facility record last updated February 16, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Tertiary treatment · Significant industrial user · all terms