- Seosan WWTP : 40,000㎥/day
- Daesan WWTP : 3,000㎥/day
- Seongyeon WWTP : 2,000㎥/day
- Eumam Public WWTP : 800㎥/day
- Dodang Public WWTP : 800㎥/day
- Seosan Night- Soil Treatmetn Facility : 150㎥/day
- Hongju Town Sewer Networks and 8 more (Samll Scale)