Southwest Regional WWTP
Medway, OH · Clark County · Publicly Owned Treatment Works
- Average flow
- 1.09 MGD
- Design flow
- 4 MGD
- NPDES permit
- OH0049794
- Effective
- Permit expires
- November 2026
- Population served
- 23,925
- CWNS 2022
Southwest Regional WWTP is a publicly owned wastewater treatment works in Medway, Clark County, Ohio treating an average of 1.09 million gallons per day against a permitted design capacity of 4 MGD, serving about 23,925 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit OH0049794 (effective), which expires in November 2026, with 2 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 2
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Southwest Regional WWTP.
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Nearby wastewater treatment plants in Ohio
Huber Hts · 3 mi away
3.48 MGD
New Carlisle · 4 mi away
0.4 MGD
Dayton · 8 mi away
7.07 MGD
Yellow Springs · 9 mi away
0.26 MGD
Springfield · 10 mi away
12.27 MGD
Kettering · 11 mi away
5.68 MGD
Xenia · 11 mi away
2.05 MGD
Dayton · 12 mi away
7.3 MGD
Southwest Regional 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 September 11, 2026; facility record last updated May 23, 2025.