Clean Water Branch

Watershed Planning and Polluted Runoff Control

Clean Water Act Section 319 funds are used to develop and implement watershed-based plans. The PRC Program supports and coordinates watershed planning activities. Only watersheds that have watershed-based plans or alternative watershed-based plans approved by the PRC Program are eligible for Section 319 project funds. Approved watershed-based plans and alternative watershed-based plans are available to view and download below and are also available on the Surface Water Protection (SWP) System Viewer. The PRC Program maintains a list of eligible watersheds, which are displayed on the interactive map below.

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Watershed-Based Plans

Below is a list of watersheds with approved watershed-based plans. Watersheds with a TMDL are noted; the full TMDL reports are available on the Clean Water Branch’s Integrated Report and TMDL webpage.

Kauaʻi

• Hanalei Bay watershed (includes Hanalei, Waikoko, Waipa, and Waioli)
  • Watershed Management Plan for Hanalei Bay Vol. 1 Watershed Characterization (2012)
  • Watershed Management Plan for Hanalei Bay Vol. 2 Strategies and Implementation with Invasive Species Addendum (2014)
  • TMDL Phase 1 – Streams and Estuaries (2008)
  • TMDL Phase 2 – Embayment (2011)
• Nawiliwili Bay watershed (includes Puali, Huleʻia, and Nawiliwili)
  • Restoration and Protection Plan for the Naw with Invasive Species Addendum iliwili Watershed (2004)
  • TMDL (2008)

Oʻahu

• Ala Wai watershed (includes Manoa-Palolo, Makiki, and Ala Wai)
  • Management and Implementation Plan (1998)
    • Volume I
    • Volume II (Appendices A-C, Appendices D-K with Invasive Species Addendum)
  • Ala Wai Canal TMDL (2002)
• Honouliuli watershed
  • Watershed-Based Management Plan for Honouliuli Watershed with Invasive Species Addendum (2013)
• Kaiaka Bay (includes Kiʻikiʻi and Paukauila)
  • Kaiaka Bay Watershed-Based Plan (2018)
    • Volume 1 Watershed Characterization
    • Volume 2 Implementation Plan
    • Appendix A & B – Geomorphic Assessment of Poamoho Stream & Invasive Species Addendum
    • Kaiaka Bay WBP 2018 Community Meeting Presentation
  • N. and S. Fork Kaukonahua Stream TMDL (2009)
• Kapakahi Stream watershed
  • Kapakahi Stream Watershed Plan with Invasive Species Addendum (2006)
• Koʻolaupoko watersheds (includes watersheds from Kualoa to Makapuʻu)
  • Koʻolaupoko Watershed Restoration Action Strategy (2007)
  • TMDLs
    • Kaneohe Stream TMDL (2009)
    • Kawa Stream TMDL (2005)
    • Waimanalo Stream TMDL (2001)
• Maʻiliʻili watershed
  • Maʻiliʻili Watershed Management Plan (2014)
  • Appendices with Invasive Species Addendum

• Waikele Watershed
  • Waikele Watershed Plan
  • Waikele Appendices with Invasive Species Addendum
• Wailupe Watershed
  • Watershed Based Plan for Reduction of Nonpoint Source Pollution in Wailupe Stream Watershed (2010)
  • Appendix A: Figures
  • Appendix B: Management Practices: Glossary and Design Features
  • Appendix C: Invasive Species Addendum

Molokaʻi

• Kawela watershed
  • Alternative Watershed-Based Plan for the Kawela Watershed, Molokaʻi, Hawaiʻi with Invasive Species Addendum (2019)

Maui

• Kahoma and Kaua’ula Watersheds
  • Alternative Watershed Plan for Kahoma and Kaua’ula Watersheds in West Maui, Hawai’i (2025)
• Ma’alaea Bay Watersheds
  • Ma’alaea Bay Watersheds Management Plan with Invasive Species Addendum (2023)
• Southwest Maui watersheds (includes Hapapa, Wailea, Moʻoloa)
  • Southwest Maui Watershed Management Plan with Invasive Species Addendum (2019)
• West Maui watersheds (includes Honokowai, Wahikuli, Kahana, Honokahua and Honolua)
  • Wahikuli-Honokowai Watershed Management Plan Vol. 1 Watershed Characterization (2012)
  • Wahikuli-Honokowai Watershed Management Plan Vol. 2 Strategies and Implementation with Invasive Species Addendum (2012)
  • Kahana, Honokahua and Honolua Watersheds Characterization Report (2016)
  • Kahana, Honokahua and Honolua Watersheds Strategies and Implementation Report with Invasive Species Addendum (2016)

• South Central Maui watershed
  • Pohakea Watershed Plan Final Report with Invasive Species Addendum (2023)

Kahoʻolawe

• Kaulana and Hakioawa watersheds
  • Watershed Based Plan for Kaulana and Hakioawa with Invasive Species Addendum (2006)
• Kamohio watershed
  • Watershed Based Plan for Kamohio with Invasive Species Addendum (2022)

Hawaiʻi

• Pelekane Bay watershed (Kawaihae watershed)
  • Pelekane Bay Watershed Management Plan with Invasive Species Addendum (2005)

• Waikoloa-Waiʻulaʻula Stream watershed
  • Waiʻulaʻula Watershed Management Plan with Invasive Species Addendum (2011)

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Additional Resources

Below are additional resources that may be referenced in the development and implementation of watershed-based plans.

• Estimating Pollutant Load Reductions Resulting from Control and Removal of Invasive Plant and Animal Species and Establishment of Native Species (August 2025)