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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 · HydroWASTE v1.0 / United States

Data years: 2012. The inventory date does not establish current operation.

22 results

CompareNameNative sizeYear
SAND ISLAND WWTPHW:27344418,655 population served2012
HONOULIULI WWTPHW:27346188,905 population served2012
KAILUA WWTPHW:2734582,019 population served2012
KIHEI WWTFHW:2735844,325 population served2012
WAILUKU KAHULUI WWTFHW:2735637,492 population served2012
WAIANAE WWTPHW:2735136,884 population served2012
HILO WWTFHW:2733936,000 population served2012
LAHAINA WWRFHW:2735734,998 population served2012
WAHIAWA WWTPHW:2734920,207 population served2012
KEALAKEHE WWTPHW:2734217,616 population served2012
LIHUE WWTFHW:2735210,200 population served2012
WAIMANALO WWTFHW:273508,200 population served2012
ELEELE WWTFHW:273557,500 population served2012
WAILUA WWTFHW:273533,300 population served2012
WAIMEA WWTF KauaiHW:273543,000 population served2012
LANAI CITY WWTFHW:273602,140 population served2012
KAUNAKAKAI WWTFHW:273591,821 population served2012
KULAIMANO WWTFHW:273411,605 population served2012
HONOKAA WWTFHW:273431,500 population served2012
KAHUKU WWTPHW:273471,500 population served2012
PAPAIKOU_PAUKAA WWTFHW:273401,326 population served2012
PAALAA KAI WWTPHW:27348950 population served2012

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.