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Maryland: Laws & Legal Considerations

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Maryland treats rainwater harvesting as a defined, regulated category within its building code rather than leaving it to general water law.

RuleMaryland
Source water Rooftop or other catchment
Permit required No, for typical residential non-potable systems
Permitted uses Non-potable: toilet flushing and similar uses
Underlying code 2018 Maryland Plumbing Code, Chapter 13 (Nonpotable Water Systems), §1303 (Non-Potable Rainwater Collection and Distribution Systems)

Where to find it: Maryland’s water conservation guidance (mde.maryland.gov) recommends non-potable rainwater use as part of standard conservation practice.

Water rights: riparian, with a real interstate dispute in its history

Maryland follows ordinary riparian rights doctrine for its waterways, but its most consequential water-law episode wasn’t about ordinary reasonable use, it was a genuine interstate fight with Virginia over the Potomac River that reached the U.S. Supreme Court.

ConceptHow it works in Maryland
Who holds the right Landowners with property abutting a body of water
What riparian rights include Access to the water, building a pier or dock, and reasonable use without transforming the water itself

Virginia v. Maryland (2003)

Maryland and Virginia disputed Virginia’s right to withdraw water from the Potomac River and build structures into it, a conflict rooted in a 1785 compact between the two states. The U.S. Supreme Court ruled in Virginia’s favor in 2003, confirming Virginia’s riparian rights on the river didn’t require Maryland’s permission. It’s a useful reminder that water rights disputes aren’t always between individual landowners, sometimes they’re between entire states.

Where to find it: the Maryland Department of the Environment administers state water rights and permitting.

Concealed carry: a two-license sequence, not a single application

Maryland requires a Wear and Carry Permit, but unlike most states covered on this site, getting one requires first holding a separate, distinct license.

RequirementDetail
Prerequisite A Handgun Qualification License (HQL) is required before applying for the Wear and Carry Permit; the HQL has its own training, fingerprinting, and background check
Standard Shall-issue since the 2022 Bruen decision
Minimum age 21 (18 for active-duty military)
Training required 16 hours, including live-fire practice and demonstrated proficiency
Cost $125 non-refundable application fee, on top of the separate HQL cost

Why this sequential structure is genuinely different from Illinois's

Illinois also requires two licenses (a FOID card, then a separate CCL), but a FOID card is required just to own a gun at all. Maryland’s HQL is specifically a prerequisite step toward carrying, layered directly beneath the Wear and Carry Permit itself, a different structural relationship between the two licenses.

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