4460 Nalu Road, Kapaa, HI 96746 · Kauai County · Publicly Owned Treatment Works
Wailua Wastewater Treatment Plant is a publicly owned wastewater treatment works in Kapaa, Kauai County, Hawaii treating an average of 0.48 million gallons per day against a permitted design capacity of 1.5 MGD, serving about 3,512 residents. It discharges under NPDES permit HI0020257 (administratively continued), which expires in October 2024, with 4 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in August 1999.
One treatment structure or unit process identified at Wailua Wastewater Treatment Plant.
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See the full treatment train at Wailua Wastewater Treatment Plant: structures, unit processes and planned upgrades, with exact unit counts.
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Federal civil enforcement cases, compliance inspections and informal actions recorded for Wailua Wastewater Treatment Plant in EPA's ICIS system.
Latest case · Aug 1999
COUNTY OF KAUAI
Administrative order · CWA, Violation of Existing AO · Unilateral Administrative Order Without Adjudication
Source: EPA ECHO, civil enforcement case 09-1999-0150.
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Every action against Wailua Wastewater Treatment Plant with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Decision-makers at Wailua Wastewater Treatment Plant.
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Hilo · 315 mi away
0.1 MGD
Hilo · 322 mi away
3.85 MGD
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 September 1, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Sludge dewatering · Biological nutrient removal · all terms