---
type: "Bill"
title: "Revise sanitation in subdivision laws related to mixing zones"
description: "Revise sanitation in subdivision laws related to mixing zones"
jurisdiction: "us/states/mt"
legislature: "Montana Legislature"
session: "2025"
identifier: "HB 180"
citation: "Montana HB 180 (2025)"
classification: ["bill"]
subjects: ["Counties", "Environmental Protection", "Local Government", "Planning", "Water"]
status: "enacted"
primary_sponsors: ["Courtenay Sprunger"]
version_count: 31
action_count: 36
vote_count: 6
first_action: "2024-12-13T19:28:16+00:00"
last_action: "2025-05-06T03:08:12+00:00"
source: "openstates"
source_identifier: "ocd-bill/9afb9e3a-aac8-4369-8000-f1a84df60deb"
source_url: "https://bills.legmt.gov/#/laws/bill/2/LC3143?open_tab=sum"
source_hash: "715a165b9de3385d20a2ec38239aca8962ed5c1e6a990f460a74b22ad9e00284"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-mt"]
---

# Montana HB 180 (2025) — Revise sanitation in subdivision laws related to mixing zones

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **HB0180.001.001_Amendments-in-Context_final-full.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=273037)
2. **HB0180_1(1).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=271191)
3. **HB0180_1(10).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=276586)
4. **HB0180_1(2).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=271192)
5. **HB0180_1(3).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=271193)
6. **HB0180_1(4).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=271195)
7. **HB0180_1(5).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=274250)
8. **HB0180_1(6).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=274251)
9. **HB0180_1(7).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=274252)
10. **HB0180_1(8).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=274253)
11. **HB0180_1(9).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=275545)
12. **HB0180_1.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=271002)
13. **HB0180_2(1).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=274259)
14. **HB0180_2(10).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=307768)
15. **HB0180_2(11).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=307772)
16. **HB0180_2(2).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=274263)
17. **HB0180_2(3).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=274310)
18. **HB0180_2(4).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=274311)
19. **HB0180_2(5).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=274312)
20. **HB0180_2(6).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=275556)
21. **HB0180_2(7).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=276597)
22. **HB0180_2(8).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=277912)
23. **HB0180_2(9).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=296858)
24. **HB0180_2.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=274256)
25. **HB0180_X(1).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=316809)
26. **HB0180_X(2).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=320385)
27. **HB0180_X(3).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=324609)
28. **HB0180_X(4).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=326749)
29. **HB0180_X(5).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=327760)
30. **HB0180_X.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=310869)
31. **LC3143.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=270281)

## Votes

- Do Concur — **49–0** (pass) · upper
- do_pass_as_amended — **17–0** (pass) · lower
- be_concurred_in — **11–0** (pass) · upper
- Do Pass — **100–0** (pass) · lower
- Do Concur — **49–0** (pass) · upper
- Do Pass — **99–0** (pass) · lower

## Sponsors

- Courtenay Sprunger — primary (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2024-12-13T19:28:16+00:00** (LC) Drafter Assigned
- **2025-01-08T00:12:53+00:00** (LC) Draft in Legal Review
- **2025-01-08T18:13:39+00:00** (LC) Draft in Edit
- **2025-01-08T23:13:58+00:00** (LC) Draft in Input/Proofing
- **2025-01-09T15:04:36+00:00** (LC) Draft in Final Drafter Review
- **2025-01-10T03:40:52+00:00** (LC) Draft in Assembly
- **2025-01-10T23:36:09+00:00** (LC) Draft Ready for Delivery
- **2025-01-13T16:43:38+00:00** (LC) Draft Delivered to Requester
- **2025-01-13T17:26:31+00:00** (H) Introduced
- **2025-01-13T18:44:02+00:00** (H) Referred to Committee - (H) Local Government `referral-committee`
- **2025-01-13T20:15:34+00:00** (H) First Reading `reading-1`
- **2025-01-15T00:29:16+00:00** (H) Hearing - (H) Local Government
- **2025-01-23T23:00:24+00:00** (H) Committee Executive Action--Bill Passed as Amended - (H) Local Government `committee-passage`
- **2025-01-23T23:07:31+00:00** (H) Committee Executive Action--Bill Passed as Amended - (H) Local Government `committee-passage`
- **2025-01-24T20:29:55+00:00** (H) Committee Report--Bill Passed as Amended - (H) Local Government `committee-passage`
- **2025-01-30T20:00:00+00:00** (H) Scheduled for 2nd Reading `reading-2`
- **2025-01-30T20:42:00+00:00** (H) 2nd Reading Passed `reading-2, reading-2`
- **2025-01-31T20:00:00+00:00** (H) Scheduled for 3rd Reading `reading-3`
- **2025-01-31T21:33:00+00:00** (H) 3rd Reading Passed `passage, reading-3`
- **2025-01-31T21:49:07+00:00** (H) Transmitted to Senate
- **2025-02-03T20:19:39+00:00** (S) First Reading `reading-1`
- **2025-02-18T19:01:49+00:00** (S) Referred to Committee - (S) Local Government `referral-committee`
- **2025-03-05T16:54:38+00:00** (S) Hearing - (S) Local Government
- **2025-03-21T21:02:36+00:00** (S) Committee Executive Action--Bill Concurred - (S) Local Government
- **2025-03-24T21:11:00+00:00** (S) Committee Report--Bill Concurred - (S) Local Government
- **2025-04-08T19:00:00+00:00** (S) Scheduled for 2nd Reading `reading-2`
- **2025-04-08T19:54:00+00:00** (S) 2nd Reading Concurred `reading-2, reading-2`
- **2025-04-09T19:00:00+00:00** (S) Scheduled for 3rd Reading `reading-3`
- **2025-04-09T19:25:00+00:00** (S) 3rd Reading Concurred `passage, reading-3`
- **2025-04-09T19:25:50+00:00** (H) Sent to Enrolling
- **2025-04-10T23:33:07+00:00** (H) Returned from Enrolling
- **2025-04-18T21:00:00+00:00** (H) Signed by Speaker `passage`
- **2025-04-22T13:30:24+00:00** (S) Signed by President `passage`
- **2025-04-22T18:10:24+00:00** (H) Transmitted to Governor `executive-receipt`
- **2025-05-01T21:01:00+00:00** (H) Signed by Governor `executive-signature`
- **2025-05-06T03:08:12+00:00** Chapter Number Assigned `became-law`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/9afb9e3a-aac8-4369-8000-f1a84df60deb`. Confidence: reported (aggregated from official Montana legislature records).