---
type: "Bill"
title: "Revising laws on mandatory decontamination of vessels with ballast and bladders"
description: "Revising laws on mandatory decontamination of vessels with ballast and bladders"
jurisdiction: "us/states/mt"
legislature: "Montana Legislature"
session: "2021"
identifier: "HB 40"
citation: "Montana HB 40 (2021)"
classification: ["bill"]
subjects: ["Environmental Protection", "Fish and Wildlife", "Recreation/Parks/Sports", "Water"]
status: "enacted"
primary_sponsors: ["Willis Curdy"]
version_count: 4
action_count: 42
vote_count: 6
first_action: "2020-09-11"
last_action: "2021-04-01"
source: "openstates"
source_identifier: "ocd-bill/80b39353-df24-432f-9f16-3ecfdefb8a5e"
source_url: "http://laws.leg.mt.gov/legprd/LAW0210W$BSIV.ActionQuery?P_BILL_NO1=40&P_BLTP_BILL_TYP_CD=HB&Z_ACTION=Find&P_SESS=20211"
source_hash: "6200c487ea0433758a8b32b22548144a1a68f43e47343a6da2b8caeb8bf88e0a"
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 40 (2021) — Revising laws on mandatory decontamination of vessels with ballast and bladders

## Version chain

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

1. **HB0040_1.pdf** (committee substitute) — [source](https://leg.mt.gov/bills/2021/HB0099//HB0040_1.pdf)
2. **HB0040_2.pdf** (committee substitute) — [source](https://leg.mt.gov/bills/2021/HB0099//HB0040_2.pdf)
3. **HB0040_X.pdf** (committee substitute) — [source](https://leg.mt.gov/bills/2021/HB0099//HB0040_X.pdf)
4. **Enrolled** (enrolled) — [source](https://leg.mt.gov/bills/2021/billpdf/HB0040.pdf)

## Votes

- Do Pass — **99–0** (pass) · lower
- Do Concur — **39–11** (pass) · upper
- Do Pass — **100–0** (pass) · lower
- DO PASS AS AMENDED — **17–0** (pass) · lower
- BE CONCURRED IN — **8–0** (pass) · upper
- Do Concur — **41–9** (pass) · upper

## Sponsors

- Willis Curdy — primary (person)

## Timeline

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

- **2020-09-11** Draft Request Received
- **2020-10-20** Draft in Legal Review
- **2020-11-02** Draft in Edit
- **2020-11-17** Draft to Drafter - Edit Review
- **2020-11-17** Draft in Input/Proofing
- **2020-11-25** Draft in Final Drafter Review
- **2020-11-25** Bill Draft Text Available Electronically
- **2020-11-25** Executive Director Review
- **2020-11-27** Draft in Assembly
- **2020-11-27** Draft in Final Drafter Review
- **2020-11-27** Bill Draft Text Available Electronically
- **2020-11-27** Draft in Assembly
- **2020-12-13** Introduced Bill Text Available Electronically
- **2020-12-13** Introduced `introduction`
- **2020-12-24** Referred to Committee - (H) Fish, Wildlife and Parks `referral-committee`
- **2021-01-04** First Reading - (H) Fish, Wildlife and Parks `reading-1`
- **2021-01-14** Hearing - (H) Fish, Wildlife and Parks
- **2021-01-19** Committee Executive Action--Bill Passed as Amended - (H) Fish, Wildlife and Parks `committee-passage`
- **2021-01-20** Committee Report--Bill Passed as Amended - (H) Fish, Wildlife and Parks `committee-passage`
- **2021-01-26** Scheduled for 2nd Reading
- **2021-01-26** 2nd Reading Passed `reading-2`
- **2021-01-27** Scheduled for 3rd Reading
- **2021-01-27** 3rd Reading Passed `passage, reading-3`
- **2021-01-27** Transmitted to Senate
- **2021-01-28** First Reading `reading-1`
- **2021-01-28** Referred to Committee - (S) Natural Resources `referral-committee`
- **2021-03-10** Hearing - (S) Natural Resources
- **2021-03-10** Committee Executive Action--Bill Concurred - (S) Natural Resources
- **2021-03-11** Committee Report--Bill Concurred - (S) Natural Resources
- **2021-03-15** Scheduled for 2nd Reading
- **2021-03-15** 2nd Reading Concurred `reading-2`
- **2021-03-16** Scheduled for 3rd Reading
- **2021-03-16** 3rd Reading Concurred `passage, reading-3`
- **2021-03-16** Returned to House
- **2021-03-17** Sent to Enrolling
- **2021-03-23** Returned from Enrolling
- **2021-03-23** Printed - Enrolled Version Available
- **2021-03-26** Signed by Speaker
- **2021-03-26** Signed by President
- **2021-03-26** Transmitted to Governor `executive-receipt`
- **2021-04-01** Signed by Governor `executive-signature`
- **2021-04-01** 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/80b39353-df24-432f-9f16-3ecfdefb8a5e`. Confidence: reported (aggregated from official Montana legislature records).