# Maryland — EPCRA Tier II hazardous chemical inventory reporting thresholds by state

For Maryland, general hazardous chemical threshold is 10,000 pounds; ehs threshold is 500 pounds or the EPA established TPQ for that chemical, whichever is lower; filing deadline is March 1st, verified against its source on 2026-09-22.

- **State:** Maryland
- **General hazardous chemical threshold:** 10,000 pounds _(verified: appears in its own passage below)_
- **EHS threshold:** 500 pounds or the EPA established TPQ for that chemical, whichever is lower _(verified: appears in its own passage below)_
- **Filing deadline:** March 1st _(verified: appears in its own passage below)_

## What the source says

> For any hazardous substance, the reporting threshold is 10,000 pounds.

## Where each value comes from

This source states these in separate places, so each value is shown with the passage that states it.

### General hazardous chemical threshold

> For any hazardous substance, the reporting threshold is 10,000 pounds.

### EHS threshold

> For an EPCRA Section 302 EHS the reporting threshold is 500 pounds or the EPA established TPQ for that chemical, whichever is lower.

### Filing deadline

> The Section 312 inventory is due March 1st each year and covers the materials at the facility during the preceding calendar year.

## Source

- https://mde.maryland.gov/programs/Businessinfocenter/CommunityRightToKnow/Pages/index.aspx

Last verified: 2026-09-22. Review by: 2027-09-22.
Part of [EPCRA Tier II hazardous chemical inventory reporting thresholds by state](https://referencesource.org/epcra-tier-ii-state-reporting-thresholds/).