Wailua Wastewater Treatment Plant
Kapaa, HI · Kauai County · Publicly Owned Treatment Works
- Average flow
- 0.34 MGD
- Design flow
- 1.5 MGD
- NPDES permit
- HI0020257
- Administratively continued
- Permit expires
- October 2024
- Population served
- 3,512
- CWNS 2022
Wailua Wastewater Treatment Plant is a publicly owned wastewater treatment works in Kapaa, Kauai County, Hawaii treating an average of 0.34 million gallons per day against a permitted design capacity of 1.5 MGD, serving about 3,512 residents. Treatment on site includes clarifiers. It discharges under NPDES permit HI0020257 (administratively continued), which expires in October 2024, with 4 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Compliance snapshot (last 3 years)
- Total violations
- 4
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Wailua Wastewater Treatment Plant.
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Nearby wastewater treatment plants in Hawaii
Hilo · 315 mi away
0.05 MGD
Hilo · 322 mi away
3.53 MGD
Wailua Wastewater Treatment Plant: 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 September 1, 2025.