Markle WWTP
305 W Morse Street, Markle, IN 46770 · Huntington County · Publicly Owned Treatment Works
- Average flow
- 0.14 MGD
- Design flow
- 0.45 MGD
- NPDES permit
- IN0023736
- Effective
- Permit expires
- February 2030
- Population served
- 1,435
- CWNS 2022
Markle WWTP is a publicly owned wastewater treatment works in Markle, Huntington County, Indiana treating an average of 0.14 million gallons per day against a permitted design capacity of 0.45 MGD, serving about 1,435 residents. It discharges under NPDES permit IN0023736 (effective), which expires in February 2030, with 12 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Markle WWTP.
Available with a free Klarifi account
See the full treatment train at Markle WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 12
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Markle WWTP, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Markle WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Indiana
Uniondale · 5 mi away
0.01 MGD
Huntington · 9 mi away
4.95 MGD
Roanoke · 10 mi away
0.17 MGD
Ossian · 10 mi away
0.69 MGD
Bluffton · 10 mi away
1.81 MGD
Warren · 11 mi away
0.37 MGD
Mount Etna · 13 mi away
0.02 MGD
Huntington · 13 mi away
0.0063 MGD
Markle 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 6, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Sludge dewatering · Biological nutrient removal · all terms