Hawaii HB1728: Relating to Rainwater Catchment Systems.

What the bill says

A bill for an act relating to rainwater catchment systems.

From the enrolled text:

A BILL FOR AN ACT RELATING TO RAINWATER CATCHMENT SYSTEMS. SECTION 1. The legislature finds that limited water infrastructure is a major barrier to new housing and sustainable land use in the State. Many properties, whether connected or not to county water systems, face restrictions that prevent efficient water use or new development. Rainwater catchment systems offer a low-cost, sustainable way to supplement water supply for potable and nonpotable uses. The legislature further finds that allowing these systems across all zoning types can reduce strain on public infrastructure, support local selfsufficiency, and encourage responsible water management. Therefore, the purpose of this Act is to: (1) Require the counties to allow for the installation and operation of rainwater catchment systems for potable and nonpotable uses on all properties; and (2) Allow the counties to require registration, inspection, or notification of rainwater catchment systems. 2026--3473 HB1728 CD1 HMSO H.B. NO. ~ Page2 C.D. SECTION 2. Chapter 46, Hawaii Revised Statutes, is amended by adding a new section to be appropriately designated and to read as follows: "~46- Regulation of rainwater catchment systems. (a) Pursuant to the authority granted to the counties under section 46--1.5(13) and (14) (A) (ii), each county shall permit the installation and operation of rainwater catchment systems for potable and nonpotable uses on all properties, regardless of whether the …

Read the full official text

Sponsors

• Luke Evslin (D, 16) · primary sponsor
• Terez Amato (D, 11)
• Della Belatti (D, 26)
• Andrew Garrett (D, 22)
• Tina Grandinetti (D, 20)
• Greggor Ilagan (D, 4)
• Susan Keohokapu-Lee Loy (D, 2)
• Darius Kila (D, 44)
• Matthias Kusch (D, 1)
• Lisa Marten (D, 51)
• Tyson Miyake (D, 10)
• Daynette Morikawa (D, HD-017)

Latest actions

1. July 9, 2026: Act 209, on 07/08/2026 (Gov. Msg. No. 1311).
2. July 9, 2026: Act 209, 07/08/2026 (Gov. Msg. No. 1311).
3. May 8, 2026: Received notice of passage on Final Reading in House (Hse. Com. No. 888).
4. May 7, 2026: Transmitted to Governor.
5. May 6, 2026: Received notice of Final Reading (Sen. Com. No. 816).
6. May 6, 2026: Passed Final Reading as amended in CD 1 with none voting aye with reservations; none voting no (0) and none excused (0).
7. May 6, 2026: Passed Final Reading, as amended (CD 1). Ayes, 25; Aye(s) with reservations: none . 0 No(es): none. 0 Excused: none.
8. April 29, 2026: 48 Hrs. Notice (as amended CD 1) 05-06-26
9. April 29, 2026: Reported from Conference Committee as amended CD 1 (Conf. Com. Rep. No. 84-26).
10. April 29, 2026: Forty-eight (48) hours notice Wednesday 05-06-26.

Votes

• Passed Final Reading, as amended (CD 1) (May 6, 2026): 25 yea, 0 nay, passed
• Final Reading as amended in CD 1 with none voting aye with reservations; none voting no (0) and none excused (0) (May 6, 2026): 51 yea, 0 nay, passed
• none. (April 29, 2026): 3 yea, 0 nay, passed
• Conference Committee Vote (April 29, 2026): 3 yea, 0 nay, passed
• Report adopted; Passed Third Reading (April 14, 2026): 25 yea, 0 nay, passed
• JDC: recommend(s) that the measure be PASSED, UNAMENDED (April 7, 2026): 4 yea, 0 nay, passed

Common questions

What is HB1728?

HB1728 is a bill in the Hawaii Legislature (2026 Regular Session): Relating to Rainwater Catchment Systems.

What does HB1728 do?

In its own words: A bill for an act relating to rainwater catchment systems.

What is the status of HB1728?

Signed into law as of July 9, 2026. Latest action: Act 209, on 07/08/2026 (Gov. Msg. No. 1311). (July 9, 2026).

Who sponsored HB1728?

Luke Evslin (D, 16), with 11 co-sponsors.

Where is the official record for HB1728?

On the Hawaii Legislature website: https://www.capitol.hawaii.gov/measure_indiv.aspx?billtype=HB&billnumber=1728&year=2026