# Hawaii HB 1728: RELATING TO RAINWATER CATCHMENT SYSTEMS.

Hawaii HB 1728, RELATING TO RAINWATER CATCHMENT SYSTEMS., is a 2025–2026 Regular Session (Year 2) House bill sponsored by Luke A. Evslin (Democratic); status signed, last action 2026-07-08 (Act 209, 07/08/2026 (Gov. Msg. No. 1311).); PRIA reads it as touching household money (as of 2026-11-01).

- Canonical: https://policyrisk.com/state-bill/HI-HB1728-2026
- As of: 2026-11-01
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Bill: Hawaii HB 1728
- State: Hawaii
- Session: 2025–2026 Regular Session (Year 2)
- Title: RELATING TO RAINWATER CATCHMENT SYSTEMS.
- Status: signed
- Chamber: House
- Introduced: 2026-01-20
- Last action: 2026-07-08, Act 209, 07/08/2026 (Gov. Msg. No. 1311).
- Sponsor: Luke A. Evslin (Democratic)
- Cosponsors: 19
- Subjects: Counties, Rainwater Catchment Systems, EIG/WLA, JDC
- Touches household money: yes
- Roll calls: 11 (212 yes, 0 no in all)
- Economic provisions PRIA read: 1

## 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)

## Bill overview: provisions PRIA read

- Homeowners can install rainwater systems: benefit, low. 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 r…

## Sponsors and cosponsors

- Sponsor: Luke A. Evslin (Democratic), House
- Cosponsor: Terez Amato (Democratic), House
- Cosponsor: Della Au Belatti (Democratic), House
- Cosponsor: Andrew Takuya Garrett (Democratic), House
- Cosponsor: Tina Nakada Grandinetti (Democratic), House
- Cosponsor: Greggor Ilagan (Democratic), House
- Cosponsor: KEOHOKAPU-LEE LOY
- Cosponsor: Darius K. Kila (Democratic), House
- Cosponsor: Matthias Kusch (Democratic), House
- Cosponsor: Lisa Marten (Democratic), House
- Cosponsor: Tyson K. Miyake (Democratic), House
- Cosponsor: Dee Morikawa (Democratic), House
- Cosponsor: Scot Z. Matayoshi (Democratic), House
- Cosponsor: Amy A. Perruso (Democratic), House
- Cosponsor: Mahina Poepoe (Democratic), House
- Cosponsor: REYES ODA
- Cosponsor: Garner M. Shimizu (Republican), House
- Cosponsor: Kanani Souza (Republican), House
- Cosponsor: Gregg Takayama (Democratic), House
- Cosponsor: David A. Tarnas (Democratic), House

## Roll call votes

| Date | Chamber | Motion | Result | Yes | No | Other |
| --- | --- | --- | --- | --- | --- | --- |
| 2026-05-06 | House | House Floor Vote | pass | 51 | 0 |   |
| 2026-04-29 | House | The Conference Committee recommends that the measure be Passed, with Amendments.... | pass | 3 | 0 |   |
| 2026-04-29 | Senate | The Conference committee recommends that the measure be PASSED, WITH AMENDMENTS.... | pass | 3 | 0 |   |
| 2026-04-14 | Senate | Senate Floor Vote | pass | 25 | 0 |   |
| 2026-04-07 | Senate | The committee(s) on JDC recommend(s) that the measure be PASSED, UNAMENDED. The... | pass | 4 | 0 |   |
| 2026-03-19 | Senate | The committee(s) on EIG recommend(s) that the measure be PASSED, WITH AMENDMENT... | pass | 5 | 0 |   |
| 2026-03-19 | Senate | The committee(s) on WLA recommend(s) that the measure be PASSED, WITH AMENDMENT... | pass | 4 | 0 |   |
| 2026-03-10 | House | House Floor Vote | pass | 50 | 0 |   |
| 2026-03-04 | House | The committee on JHA recommend that the measure be PASSED, UNAMENDED. The votes ... | pass | 8 | 0 |   |
| 2026-02-11 | House | Passed Second Reading as amended in HD 1 and referred to the committee(s) on JHA... | pass | 50 | 0 |   |
| 2026-02-03 | House | The committee on WAL recommend that the measure be PASSED, WITH AMENDMENTS. The ... | pass | 9 | 0 |   |

## Actions (45)

- 2026-07-08: Act 209, 07/08/2026 (Gov. Msg. No. 1311). (Senate)
- 2026-07-08: Act 209, on 07/08/2026 (Gov. Msg. No. 1311). (House)
- 2026-05-08: Received notice of passage on Final Reading in House (Hse. Com. No. 888). (Senate)
- 2026-05-07: Transmitted to Governor. (House)
- 2026-05-06: Passed Final Reading, as amended (CD 1). Ayes, 25; Aye(s) with reservations: none . 0 No(es): none. 0 Excused: none. (Senate)
- 2026-05-06: Passed Final Reading as amended in CD 1 with none voting aye with reservations; none voting no (0) and none excused (0). (House)
- 2026-05-06: Received notice of Final Reading (Sen. Com. No. 816). (House)
- 2026-04-29: 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.. (Senate)
- 2026-04-29: 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. (House)
- 2026-04-29: Reported from Conference Committee (Conf Com. Rep. No. 84-26) as amended in (CD 1). (House)
- 2026-04-29: Forty-eight (48) hours notice Wednesday 05-06-26. (House)
- 2026-04-29: Reported from Conference Committee as amended CD 1 (Conf. Com. Rep. No. 84-26). (Senate)
- 2026-04-29: 48 Hrs. Notice (as amended CD 1) 05-06-26 (Senate)
- 2026-04-27: Conference committee meeting scheduled for 04-29-26 10:50AM; Conference Room 325. (Senate)
- 2026-04-20: House Conferees Appointed: Hashem, Tarnas Co-Chairs; Souza. (House)
- 2026-04-20: Received notice of appointment of House conferees (Hse. Com. No. 786). (Senate)
- 2026-04-20: Senate Conferees Appointed: Wakai Chair; Lee, C., San Buenaventura Co-Chairs; Fevella. (Senate)
- 2026-04-20: Received notice of Senate conferees (Sen. Com. No. 713). (House)
- 2026-04-17: Received notice of disagreement (Hse. Com. No. 780). (Senate)
- 2026-04-16: House disagrees with Senate amendment (s). (House)
- 2026-04-14: Report adopted; Passed Third Reading. Ayes, 25; Aye(s) with reservations: none . Noes, 0 (none). Excused, 0 (none). Transmitted to House. (Senate)
- 2026-04-14: Returned from Senate (Sen. Com. No. 614) in amended form (SD 1). (House)
- 2026-04-10: Reported from JDC (Stand. Com. Rep. No. 3748) with recommendation of passage on Third Reading. (Senate)
- 2026-04-10: One Day Notice 04-14-26. (Senate)
- 2026-04-07: 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. (Senate)
- 2026-04-01: The committee(s) on JDC will hold a public decision making on 04-07-26 10:15AM; Conference Room 016 & Videoconference. (Senate)
- 2026-03-30: Reported from EIG/WLA (Stand. Com. Rep. No. 3258) with recommendation of passage on Second Reading, as amended (SD 1) and referral to JDC. (Senate)
- 2026-03-30: Report adopted; Passed Second Reading, as amended (SD 1) and referred to JDC. (Senate)
- 2026-03-19: The committee(s) on WLA recommend(s) that the measure be PASSED, WITH AMENDMENTS. The votes in WLA were as follows: 4 Aye(s): Senator(s) Lee, C., Chang, Lamosao, DeCorte; Aye(s) with reservations: none ; 0 No(es): none; and 1 Excused: Senator(s) Inouye. (Senate)
- 2026-03-19: The committee(s) on EIG recommend(s) that the measure be PASSED, WITH AMENDMENTS. The votes in EIG were as follows: 5 Aye(s): Senator(s) Wakai, Chang, DeCoite, Richards, Fevella; Aye(s) with reservations: none ; 0 No(es): none; and 0 Excused: none. (Senate)
- 2026-03-16: The committee(s) on EIG/WLA has scheduled a public hearing on 03-19-26 3:00PM; Conference Room 224 & Videoconference. (Senate)
- 2026-03-12: Received from House (Hse. Com. No. 273). (Senate)
- 2026-03-12: Passed First Reading. (Senate)
- 2026-03-12: Referred to EIG/WLA, JDC. (Senate)
- 2026-03-10: Passed Third Reading with Representative(s) Iwamoto voting aye with reservations; none voting no (0) and none excused (0). Transmitted to Senate. (House)
- 2026-03-06: Reported from JHA (Stand. Com. Rep. No. 1184-26), recommending passage on Third Reading. (House)
- 2026-03-04: The committee on JHA recommend that the measure be PASSED, UNAMENDED. The votes were as follows: 8 Ayes: Representative(s) Tarnas, Poepoe, Hashem, Kahaloa, Sayama, Takayama, Garcia, Shimizu; Ayes with reservations: none; Noes: none; and 2 Excused: Representative(s) Belatti, Cochran. (House)
- 2026-02-27: Bill scheduled to be heard by JHA on Wednesday, 03-04-26 2:00PM in House conference room 325 VIA VIDEOCONFERENCE. (House)
- 2026-02-11: Reported from WAL (Stand. Com. Rep. No. 200-26) as amended in HD 1, recommending passage on Second Reading and referral to JHA. (House)
- 2026-02-11: Passed Second Reading as amended in HD 1 and referred to the committee(s) on JHA with none voting aye with reservations; none voting no (0) and Representative(s) Holt excused (1). (House)
- 2026-02-03: The committee on WAL recommend that the measure be PASSED, WITH AMENDMENTS. The votes were as follows: 9 Ayes: Representative(s) Hashem, Morikawa, Belatti, Ichiyama, Poepoe, Woodson, Souza; Ayes with reservations: Representative(s) Iwamoto, Shimizu; Noes: none; and Excused: none. (House)
- 2026-01-30: Bill scheduled to be heard by WAL on Tuesday, 02-03-26 9:00AM in House conference room 411 VIA VIDEOCONFERENCE. (House)
- 2026-01-26: Referred to WAL, JHA, referral sheet 1 (House)
- 2026-01-21: Introduced and Pass First Reading. (House)
- 2026-01-20: Prefiled. (House)

## Bill text

- Bill Text: [PDF](https://data.capitol.hawaii.gov/sessions/session2026/bills/HB1728_CD1_.pdf)
- HB1728_CD1: [HTML](https://data.capitol.hawaii.gov/sessions/session2026/bills/HB1728_CD1_.HTM)
- HB1728_HD1: [HTML](https://data.capitol.hawaii.gov/sessions/session2026/bills/HB1728_HD1_.HTM)
- HB1728_SD1: [HTML](https://data.capitol.hawaii.gov/sessions/session2026/bills/HB1728_SD1_.HTM)
- Original: [HTML](https://data.capitol.hawaii.gov/sessions/session2026/bills/HB1728_.HTM), [PDF](https://data.capitol.hawaii.gov/sessions/session2026/bills/GM1311_.PDF)

## Related bills

- SB 847: RELATING TO PSYCHOLOGISTS. (became law)
- SB 2338: RELATING TO HOUSING. (signed)
- HB 2344: RELATING TO SCHOOL FACILITIES. (signed)
- HB 2023: RELATING TO TRANSPORTATION. (signed)
- HB 2021: RELATING TO TRANSPORTATION. (signed)
- SB 2964: RELATING TO PROPERTY INSURANCE. (signed)

## Sources
- [Bill Text (PDF)](https://data.capitol.hawaii.gov/sessions/session2026/bills/HB1728_CD1_.pdf)
- [HB1728_CD1 (HTML)](https://data.capitol.hawaii.gov/sessions/session2026/bills/HB1728_CD1_.HTM)
- [HB1728_HD1 (HTML)](https://data.capitol.hawaii.gov/sessions/session2026/bills/HB1728_HD1_.HTM)
- [HB1728_SD1 (HTML)](https://data.capitol.hawaii.gov/sessions/session2026/bills/HB1728_SD1_.HTM)
- [Original (HTML)](https://data.capitol.hawaii.gov/sessions/session2026/bills/HB1728_.HTM)
- [Original (PDF)](https://data.capitol.hawaii.gov/sessions/session2026/bills/GM1311_.PDF)

## Related
- [SB 847: RELATING TO PSYCHOLOGISTS.](https://policyrisk.com/state-bill/HI-SB847-2026)
- [SB 2338: RELATING TO HOUSING.](https://policyrisk.com/state-bill/HI-SB2338-2026)
- [HB 2344: RELATING TO SCHOOL FACILITIES.](https://policyrisk.com/state-bill/HI-HB2344-2026)
- [HB 2023: RELATING TO TRANSPORTATION.](https://policyrisk.com/state-bill/HI-HB2023-2026)
- [HB 2021: RELATING TO TRANSPORTATION.](https://policyrisk.com/state-bill/HI-HB2021-2026)
- [SB 2964: RELATING TO PROPERTY INSURANCE.](https://policyrisk.com/state-bill/HI-SB2964-2026)
- [Hawaii bills](https://policyrisk.com/states/hawaii/bills)
- [Hawaii state hub](https://policyrisk.com/states/hawaii)
- [All state legislation](https://policyrisk.com/state-bills)

Source: PRIA, https://policyrisk.com/state-bill/HI-HB1728-2026 (as of 2026-11-01).