Hardin Pws
East Main & 10 Hwy, Hardin, MO 64035 · Ray County · Publicly Owned Treatment Works
- Average flow
- 0.03 MGD
- Design flow
- —
- NPDES permit
- MO0046655
- Administratively continued
- Permit expires
- December 2023
- Population served
- 655
- CWNS 2022
Hardin Pws is a publicly owned wastewater treatment plant in Hardin, Ray County, Missouri treating an average of 0.03 million gallons per day, serving about 655 residents. It discharges under NPDES permit MO0046655 (administratively continued), which expires in December 2023, with 41 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in August 2025.
Treatment technology
2 treatment structures and unit processes identified, 1 planned upgrade on record at Hardin Pws.
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See the full treatment train at Hardin Pws: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 41
- 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 Hardin Pws in EPA's ICIS system.
- Formal actions
- 1
- 1 since FY2020
- Compliance actions
- $573
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Aug 2025
Hardin PWS SDWA 1414G2 AO for Compliance
Administrative order · SDWA, National Drinking Water Regulations · Final Order No Penalty · Compliance actions $573
EPA's description of the case:
“Administrative order issued to the public water system for non-compliance with the SDWA for failure to submit the service line inventory pursuant to the SDWA regulations at 40 C.F.R. ?? 141.84(a) and…”
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Source: EPA ECHO, civil enforcement case 07-2025-0180.
Full case history with a free Klarifi account
Every action against Hardin Pws with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Hardin Pws.
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Nearby wastewater treatment plants in Missouri
Lexington · 7 mi away
0.37 MGD
Higginsville · 12 mi away
0.29 MGD
Wellington · 14 mi away
0.04 MGD
Higginsville · 15 mi away
0.0041 MGD
Mayview · 15 mi away
0.02 MGD
Corder · 15 mi away
0.01 MGD
Orrick · 17 mi away
0.05 MGD
Waverly · 17 mi away
0.21 MGD
Hardin Pws: 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 March 15, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biosolids · Filter press · all terms