---
title: Maryland Boating Under the Influence of drugs and alcohol
description: Maryland law defines operating under the influence (OUI) as operating a vessel while having a blood alcohol level of 0.08% or greater.
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![Maryland Boating Under the Influence of drugs and alcohol  ](https://21118949.fs1.hubspotusercontent-na1.net/hub/21118949/hubfs/courses/ccep2021/images/alcool-navigation.png?width=1100&height=666&name=alcool-navigation.png)

**In Maryland, it is unlawful to operate a vessel (including PWC) or use water skis or a similar device while under the influence of alcohol or another impairing substance.**

**Maryland law defines operating under the influence (OUI) as operating a vessel or manipulating water skis or a similar device while having a blood alcohol level of 0.08% or greater.**

Anyone who operates on Maryland waters under the influence of alcohol or drugs may be subject to fines and/or possible jail time if convicted. 

Anyone operating a boat on state waters has given consent (Implied Consent Law) to sobriety testing if requested by a law enforcement official. Refusal is a violation of the law and may result in arrest and penalties.

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