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World wastewater treatment plant observatory · data as reported by each inventory

Wastewater treatment plants in United States · Hawaii

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22 inventory records · EPA Clean Watersheds Needs Survey 2022

Data years: 2022. The inventory date does not establish current operation.

22 results

CompareNameNative sizeYear
SAND ISLAND WWTPHonolulu90 MGD (million gallons per day)2022
HONOULIULI WWTPEwa Beach38 MGD (million gallons per day)2022
KAILUA WWTPKailua15.25 MGD (million gallons per day)2022
LAHAINA WWRFLahaina9 MGD (million gallons per day)2022
WAILUKU-KAHULUI WWTFKahului7.9 MGD (million gallons per day)2022
KIHEI WWTFKihei7.5 MGD (million gallons per day)2022
KEALAKEHE WWTPKailua Kona5.3 MGD (million gallons per day)2022
WAIANAE WWTPWaianae5.2 MGD (million gallons per day)2022
HILO WWTFHilo5 MGD (million gallons per day)2022
WAHIAWA WWTPWahiawa2.5 MGD (million gallons per day)2022
LIHUE WWTFLihue2.5 MGD (million gallons per day)2022
WAIMANALO WWTFWaimanalo1.1 MGD (million gallons per day)2022
LAIE WRFLaie0.9 MGD (million gallons per day)2022
WAILUA WWTFWaialua0.8 MGD (million gallons per day)2022
ELEELE WWTFEleele0.8 MGD (million gallons per day)2022
LANAI CITY WWTFLanai City0.54 MGD (million gallons per day)2022
KULAIMANO WWTFPepeekeo0.5 MGD (million gallons per day)2022
KAHUKU WWTPKahuku0.4 MGD (million gallons per day)2022
PAPAIKOU/PAUKAA WWTFPapaikou0.35 MGD (million gallons per day)2022
KAUNAKAKAI WWTFKaunakakai0.3 MGD (million gallons per day)2022
PAALAA KAI WWTPWaialua0.144 MGD (million gallons per day)2022
HONOKAA WWTFHonokaa0.056 MGD (million gallons per day)2022

Regulatory context

General reference. This is not an exhaustive review of applicable law.

United States: Clean Water Act / NPDES

NPDES regulates pollutant discharges from point sources to waters of the United States. The permit sets limits and monitoring conditions. A CWNS code identifies an inventory record, not an NPDES permit.

  • Permit identifier and permitting authority: EPA or an authorized state.
  • Outfall and receiving water; sewer connections follow a different control route.
  • Current permit conditions, limits and dated measurements; these are not included in CWNS.

References reviewed: 2026-11-06. Individual applicability: undetermined. This profile does not establish authorization or compliance.