---
type: "Bill"
title: "Clean Water Commerce Act of 2021"
description: "Clean Water Commerce Act of 2021"
jurisdiction: "us/states/md"
legislature: "Maryland General Assembly"
session: "2021"
identifier: "HB 507"
citation: "Maryland HB 507 (2021)"
classification: ["bill"]
subjects: []
status: "enacted"
primary_sponsors: ["Stein"]
version_count: 3
action_count: 16
vote_count: 4
first_action: "2021-01-15"
last_action: "2021-05-30"
source: "openstates"
source_identifier: "ocd-bill/e61a23d7-dde1-4ed7-b44b-ea7aba7efb4c"
source_url: "http://mgaleg.maryland.gov/mgawebsite/Legislation/Details/hb0507?ys=2021RS&search=True"
source_hash: "e64701ded2379a8bbaf9a674886ae971dec51d720e696834648617392a814156"
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-md"]
---

# Maryland HB 507 (2021) — Clean Water Commerce Act of 2021

## Version chain

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

1. **Chapter - Clean Water Commerce Act of 2021** (committee substitute) — [source](http://mgaleg.maryland.gov/2021RS/Chapters_noln/CH_695_hb0507t.pdf)
2. **First - Clean Water Commerce Act of 2021** (committee substitute) — [source](http://mgaleg.maryland.gov/2021RS/bills/hb/hb0507f.pdf)
3. **Third - Clean Water Commerce Act of 2021** (committee substitute) — [source](http://mgaleg.maryland.gov/2021RS/bills/hb/hb0507t.pdf)

## Votes

- FLA Del. Szeliga /793622/1 — **40–89** (fail) · lower
- HB 507 HB 636 HB 799 HB 831 — **47–0** (pass) · upper
- FLA Del. Szeliga /243928/1 — **41–88** (fail) · lower
- On Third Reading — **98–38** (pass) · lower

## Sponsors

- Stein — primary (person)

## Timeline

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

- **2021-01-15** First Reading Environment and Transportation and Appropriations `referral-committee`
- **2021-01-26** Hearing 2/10 at 1:30 p.m. (Environment and Transportation)
- **2021-03-15** Favorable with Amendments Report by Environment and Transportation `committee-passage-favorable`
- **2021-03-16** Favorable with Amendments { `committee-passage-favorable`
- **2021-03-16** Motion Special Order until Next Session (Delegate Szeliga) Adopted
- **2021-03-17** Motion Special Order until Later This Session (Delegate Szeliga) Adopted
- **2021-03-17** Floor Amendment {
- **2021-03-17** Floor Amendment {
- **2021-03-17** Second Reading Passed with Amendments
- **2021-03-18** Third Reading Passed `passage`
- **2021-03-19** Referred Education, Health, and Environmental Affairs Budget and Taxation `referral-committee`
- **2021-04-10** Favorable Report by Education, Health, and Environmental Affairs `committee-passage-favorable`
- **2021-04-10** Favorable Adopted Second Reading Passed `committee-passage-favorable`
- **2021-04-12** Third Reading Passed `passage`
- **2021-04-12** Returned Passed
- **2021-05-30** Enacted under Article II, Section 17(c) of the Maryland Constitution - Chapter 695 `became-law`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/e61a23d7-dde1-4ed7-b44b-ea7aba7efb4c`. Confidence: reported (aggregated from official Maryland legislature records).