Hamler WWTP
871 Cr E, Hamler, OH 43524 · Henry County · Publicly Owned Treatment Works
- Average flow
- 0.18 MGD
- Design flow
- 0.11 MGD
- NPDES permit
- OH0021105
- Effective
- Permit expires
- November 2027
- Population served
- 599
- CWNS 2022
Hamler WWTP is a publicly owned wastewater treatment works in Hamler, Henry County, Ohio treating an average of 0.18 million gallons per day against a permitted design capacity of 0.11 MGD, serving about 599 residents. It discharges under NPDES permit OH0021105 (effective), which expires in November 2027, with 60 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in February 2023.
Treatment technology
One treatment structure or unit process identified at Hamler WWTP.
Available with a free Klarifi account
See the full treatment train at Hamler WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 60
- Effluent violations
- 60
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 Hamler WWTP in EPA's ICIS system.
- Formal actions
- 1
- 1 since FY2020
- Compliance actions
- $100,000
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Feb 2023
Hamler WWTP AOC
Administrative order · CWA, NPDES Permit Violations · Final Order Issued · Compliance actions $100,000
EPA's description of the case:
“AOC to address permit effluent violations and return facility to compliance.”
Source: EPA ECHO, civil enforcement case 05-2023-0313.
Full case history with a free Klarifi account
Every action against Hamler WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
1 verified contact for Hamler WWTP, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at Hamler WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Ohio
Holgate · 6 mi away
—
Deshler · 8 mi away
0.45 MGD
Leipsic · 10 mi away
1 MGD
Mcclure · 11 mi away
—
Miller City · 11 mi away
0.01 MGD
Napoleon · 11 mi away
1.7 MGD
Hoytville · 13 mi away
—
Liberty Center · 13 mi away
0.07 MGD
Hamler 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 September 16, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms