HawaiiHB 17282025–2026 Regular Session (Year 2)HouseWALLET

RELATING TO RAINWATER CATCHMENT SYSTEMS.

Sponsored By: Luke A. Evslin (Democratic)

Signed by Governor

Summary

Requires the Department of Health to allow for the installation and operation of rainwater catchment systems for potable and nonpotable uses on all properties. Requires the Department of Health to regulate and enforce standards for the use of rainwater catchment systems. Effective 7/1/3000. (SD1)

CountiesRainwater Catchment SystemsEIG/WLA, JDC

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Bill Overview

Analyzed Economic Effects

1 provisions identified: 1 benefits, 0 costs, 0 mixed.

Homeowners can install rainwater systems

Beginning July 1, 2026, Hawaii counties must allow rainwater catchment systems on all properties, whether connected to county water or not. The systems can collect rainwater for drinking and other uses, including irrigation, toilet flushing, cleaning, and watering landscapes. Counties may require registration, inspection, or notice when needed to protect public health or water quality, but cannot unreasonably restrict or ban these systems.

Sponsors & Cosponsors

Sponsor

  • Luke A. Evslin

    Democratic • House

Cosponsors

  • Terez Amato

    Democratic • House

  • Della Au Belatti

    Democratic • House

  • Andrew Takuya Garrett

    Democratic • House

  • Tina Nakada Grandinetti

    Democratic • House

  • Greggor Ilagan

    Democratic • House

  • KEOHOKAPU-LEE LOY

    Affiliation unavailable

  • Darius K. Kila

    Democratic • House

  • Matthias Kusch

    Democratic • House

  • Lisa Marten

    Democratic • House

  • Tyson K. Miyake

    Democratic • House

  • Dee Morikawa

    Democratic • House

  • Scot Z. Matayoshi

    Democratic • House

  • Amy A. Perruso

    Democratic • House

  • Mahina Poepoe

    Democratic • House

  • REYES ODA

    Affiliation unavailable

  • Garner M. Shimizu

    Republican • House

  • Kanani Souza

    Republican • House

  • Gregg Takayama

    Democratic • House

  • David A. Tarnas

    Democratic • House

Roll Call Votes

All Roll Calls

Yes: 212 • No: 0

House vote • 5/6/2026

House Floor Vote

Yes: 51 • No: 0

House vote • 4/29/2026

The Conference Committee recommends that the measure be Passed, with Amendments....

Yes: 3 • No: 0

Senate vote • 4/29/2026

The Conference committee recommends that the measure be PASSED, WITH AMENDMENTS....

Yes: 3 • No: 0

Senate vote • 4/14/2026

Senate Floor Vote

Yes: 25 • No: 0

Senate vote • 4/7/2026

The committee(s) on JDC recommend(s) that the measure be PASSED, UNAMENDED. The...

Yes: 4 • No: 0

Senate vote • 3/19/2026

The committee(s) on EIG recommend(s) that the measure be PASSED, WITH AMENDMENT...

Yes: 5 • No: 0

Senate vote • 3/19/2026

The committee(s) on WLA recommend(s) that the measure be PASSED, WITH AMENDMENT...

Yes: 4 • No: 0

House vote • 3/10/2026

House Floor Vote

Yes: 50 • No: 0

House vote • 3/4/2026

The committee on JHA recommend that the measure be PASSED, UNAMENDED. The votes ...

Yes: 8 • No: 0

House vote • 2/11/2026

Passed Second Reading as amended in HD 1 and referred to the committee(s) on JHA...

Yes: 50 • No: 0

House vote • 2/3/2026

The committee on WAL recommend that the measure be PASSED, WITH AMENDMENTS. The ...

Yes: 9 • No: 0

Actions Timeline

  1. Act 209, 07/08/2026 (Gov. Msg. No. 1311).

    7/8/2026Senate
  2. Act 209, on 07/08/2026 (Gov. Msg. No. 1311).

    7/8/2026House
  3. Received notice of passage on Final Reading in House (Hse. Com. No. 888).

    5/8/2026Senate
  4. Transmitted to Governor.

    5/7/2026House
  5. Passed Final Reading, as amended (CD 1). Ayes, 25; Aye(s) with reservations: none . 0 No(es): none. 0 Excused: none.

    5/6/2026Senate
  6. Passed Final Reading as amended in CD 1 with none voting aye with reservations; none voting no (0) and none excused (0).

    5/6/2026House
  7. Received notice of Final Reading (Sen. Com. No. 816).

    5/6/2026House
  8. The Conference committee recommends that the measure be PASSED, WITH AMENDMENTS. The votes of the Senate Conference Managers were as follows: 3 Aye(s): Senator(s) Wakai, San Buenaventura, Fevella; Aye(s) with reservations: none ; 0 No(es): none; and 1 Excused: Senator(s) Lee, C..

    4/29/2026Senate
  9. The Conference Committee recommends that the measure be Passed, with Amendments. The votes were as follows: 3 Ayes: Representative(s) Hashem, Tarnas, Souza; Ayes with reservations: none; 0 Noes: none; and 0 Excused: none.

    4/29/2026House
  10. Reported from Conference Committee (Conf Com. Rep. No. 84-26) as amended in (CD 1).

    4/29/2026House
  11. Forty-eight (48) hours notice Wednesday 05-06-26.

    4/29/2026House
  12. Reported from Conference Committee as amended CD 1 (Conf. Com. Rep. No. 84-26).

    4/29/2026Senate
  13. 48 Hrs. Notice (as amended CD 1) 05-06-26

    4/29/2026Senate
  14. Conference committee meeting scheduled for 04-29-26 10:50AM; Conference Room 325.

    4/27/2026Senate
  15. House Conferees Appointed: Hashem, Tarnas Co-Chairs; Souza.

    4/20/2026House
  16. Received notice of appointment of House conferees (Hse. Com. No. 786).

    4/20/2026Senate
  17. Senate Conferees Appointed: Wakai Chair; Lee, C., San Buenaventura Co-Chairs; Fevella.

    4/20/2026Senate
  18. Received notice of Senate conferees (Sen. Com. No. 713).

    4/20/2026House
  19. Received notice of disagreement (Hse. Com. No. 780).

    4/17/2026Senate
  20. House disagrees with Senate amendment (s).

    4/16/2026House
  21. Report adopted; Passed Third Reading. Ayes, 25; Aye(s) with reservations: none . Noes, 0 (none). Excused, 0 (none). Transmitted to House.

    4/14/2026Senate
  22. Returned from Senate (Sen. Com. No. 614) in amended form (SD 1).

    4/14/2026House
  23. Reported from JDC (Stand. Com. Rep. No. 3748) with recommendation of passage on Third Reading.

    4/10/2026Senate
  24. One Day Notice 04-14-26.

    4/10/2026Senate
  25. The committee(s) on JDC recommend(s) that the measure be PASSED, UNAMENDED. The votes in JDC were as follows: 4 Aye(s): Senator(s) Rhoads, Gabbard, Chang, San Buenaventura; Aye(s) with reservations: none ; 0 No(es): none; and 1 Excused: Senator(s) Awa.

    4/7/2026Senate

Bill Text

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