Hillsboro WWTP
1520 N High St, Hillsboro, OH 45133 · Highland County · Publicly Owned Treatment Works
- Average flow
- 1.35 MGD
- Design flow
- 1.5 MGD
- NPDES permit
- OH0020389
- Effective
- Permit expires
- December 2027
- Population served
- 6,483
- CWNS 2022
Hillsboro WWTP is a publicly owned wastewater treatment works in Hillsboro, Highland County, Ohio treating an average of 1.35 million gallons per day against a permitted design capacity of 1.5 MGD, serving about 6,483 residents. It discharges under NPDES permit OH0020389 (effective), which expires in December 2027, with 6 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Hillsboro WWTP.
Available with a free Klarifi account
See the full treatment train at Hillsboro WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 6
- Effluent violations
- 6
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Hillsboro WWTP, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Hillsboro WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Ohio
Hillsboro · 2 mi away
0.006 MGD
New Vienna · 8 mi away
0.1 MGD
Leesburg · 9 mi away
0.35 MGD
New Vienna · 10 mi away
0.0006 MGD
Lynchburg · 11 mi away
0.14 MGD
Bainbridge · 13 mi away
0.0023 MGD
Lees Creek · 13 mi away
0.0042 MGD
Greenfield · 14 mi away
0.91 MGD
Hillsboro 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 October 10, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms