SB 189 Maryland Senate · 2026 Regular Session

Municipalities - Open Drainage Inlets - Inventory and Improvements (Mason's Law)

SB 189 requires Maryland municipalities to install approved covers (grating systems) on all open drainage inlets - both new and existing - to prevent large debris from entering stormwater systems while allowing rainwater flow. It specifically mandates that these covers must be secured to prevent removal by hand or floodwaters and lists four approved types, including standard yard inlets and trash racks meeting size requirements. Municipalities must install these systems on existing inlets by June 1, 2027, and include them in all new inlets starting October 1, 2026. The law directly affects all Maryland municipalities by changing how they maintain public drainage infrastructure.
Bill status signed all 5 stages cleared
Introduction
Oct 2025
Committee Review
Apr 2026
Senate Passage
Apr 2026
House of Delegates Passage
Apr 2026
Signed into Law
May 2026
Introduced Oct 21, 2025 Signed May 12, 2026
Maddy AI version diff · 2 comparisons

What changed between versions

Third - Municipalities - Open Drainage Inlets - Required Grating Systems (Mason's Law) Enrolled - Municipalities - Open Drainage Inlets - Inventory and Improvements (Mason's Law) · 7 edits · May 12, 2026
MODERATE
The bill was finalized as an enrolled law, transitioning from a draft proposal to an enacted statute. The primary substantive change involves the repeal and reenactment of Section 5-803(h) of the Environment Article, which now details a comprehensive flood management grant program. This program establishes specific funding tiers for watershed studies, flood control projects, and post-flood recovery, including matching fund requirements and caps based on federal involvement.
Scope change
The bill's scope shifted from a narrow mandate requiring municipalities to install grating systems on open drainage inlets to a broader framework that includes inventorying inlets, prioritizing improvements, and providing state grants for watershed studies, flood control infrastructure, and post-flood recovery.
REQUIREMENT

The specific requirement to install grating systems was removed from the main text and replaced with a broader mandate to inventory and prioritize improvements to open drainage inlets.

New requirements were added for grant recipients to adopt specific response plans coordinated with emergency management authorities and provide financial commitments for project maintenance.

FISCAL

New grant provisions were added to the Environment Article, allowing the Department of the Environment to fund watershed studies and provide matching funds for flood control and watershed management projects.

Funding caps were established for the grant program, limiting expenditures to 50% of the total authorized budgeted funds in a fiscal year for certain categories.

ELIGIBILITY

Eligibility for post-flood recovery grants was added, requiring subdivisions to have incurred at least $1,000,000 in infrastructure damage from a flood event occurring on or after January 1, 2009.

DEFINITION

The detailed definitions for 'Approved Grating System' and specific exclusion criteria for open drainage inlets present in the draft were removed from the final text.

TECHNICAL

The document format was updated to reflect its status as an Enrolled Bill, including the Great Seal presentation to the Governor and proofreader signatures.

Floor votes · Senate Mar 26, 2026 · House of Delegates Mar 30, 2026

How they voted

490
Passed
Total votes 49
Mar 26, 2026
D Democratic36
36 Yea
100% Yea
R Republican13
13 Yea
100% Yea
Vote distribution
All Yea All Nay Mixed No data
Full legislative history

Actions timeline

Total actions
18
Key actions
10
Committee
6
Amendments
1
May 12, 2026
Signed into law
Approved by the Governor - Chapter 356
executive
Apr 13, 2026
Upper · Passed
Passed Enrolled
upper
Apr 13, 2026
Introduced
Senate Concurs House Amendments
upper
Apr 13, 2026
Lower · Passed
Third Reading Passed
lower
Apr 9, 2026
Lower · Passed
Favorable with Amendments {
lower
Apr 8, 2026
Lower · Passed
Favorable with Amendments Report by Environment and Transportation
lower
Mar 30, 2026
House Of Delegates · Passed
House of Delegates Vote: pass (139-0-3)
house of delegates
Mar 26, 2026
Senate · Passed
Senate Vote: pass (49-0)
senate
Mar 20, 2026
Committee
Referred Environment and Transportation
lower
Mar 19, 2026
Upper · Passed
Third Reading Passed
upper
Mar 18, 2026
Upper · Passed
Favorable with Amendments {
upper
Mar 18, 2026
Upper · Passed
Favorable with Amendments Report by Education, Energy, and the Environment
upper
Jan 14, 2026
Committee
First Reading Education, Energy, and the Environment
upper
Oct 21, 2025
Introduced
Pre-filed
upper
1 primary · 0 co-sponsors

Sponsors

Role
Legislator
Party
State
District
P
Photo of Karen Young
Karen Young
DDemocratic
MD
3