Jump to main content.


Monitoring for Liquids on the Groundwater

How does the release detection method work?

This method monitors the groundwater table near an UST for the presence of released free product on the water table. Monitoring wells near the UST are checked frequently to see if petroleum can be detected. The regulation describes several requirements for the use of this method. For example, this method cannot be used if the water table is more than 20 feet below the surface of the ground.

Features of groundwater monitoring are:

What are the regulatory requirements?

Will it work at your site?

In general, groundwater monitoring works best at UST sites where: A professionally conducted site assessment is critical for determining these site-specific conditions.

Will you be in compliance?

For USTs installed on or before April 11, 2016 owners and operators may use groundwater monitoring as their primary method of release detection. When installed and operated according to the manufacturer's specifications and in accordance with the site assessment, groundwater monitoring meets the federal release detection requirements. Operation of the groundwater monitoring system at least once each month fulfills federal regulatory requirements. Groundwater monitoring can also be used to detect leaks in piping. USTs installed or replaced after April 11, 2016 may no longer use groundwater monitoring as the primary method of release detection. USTs must be secondarily contained and use interstitial monitoring.

Top of page


Local Navigation


Jump to main content.