The dashboard displays spills data from unconventional oil and gas wells located in four states. Users are able to filter spills based on selections in the left panel. The map and charts in the panel to the right update with the selection. Click on the tab of interest to see where spills occurred and explore rates, volumes, and pathways. Pathways refer to where the spill occurred — such as tanks and flowlines. The focus of this dashboard is to show how spill frequency, volume, and pathways vary with the age of the well and the underlying cause of the spill (human error, equipment failure or environmental conditions).

This work was made possible by an interdisciplinary SNAPP working group focused on hydraulic fracturing.

Make a selection:

New Mexico
North Dakota

Spud Year (year well is drilled):

Spill Year:

Life Year of Well at Spill:

Spill Volume (gallons):


Causal Mechanism:

Map of spills displays the location of unconventional oil and gas spills. Click on a spill for more information. Click on the map overlay icon in the upper right corner of the map to see all unconventional wells, shale plays and tight plays.

Annual Spill Rate shows the spill rate for each calendar year (red line) and the cumulative number of wells (black line).

Spill Rate by Life Year shows the rate of spills based on the age of the well. Younger wells — drilling, fracturing, and highest production — have more spills than more mature wells.

Annual Spill Rate

Spill Rate by Life Year

Boxplot of Spills presents the volume of reported spills based on plot selection. You can zoom in or out (select autoscale symbol in topright of the chart). Hover over a box plot to see volumes at selected quantiles. Points to the left are individual spills.

Boxplot of Spills

Plot: Causal Mechanism Common Pathways Less Common Pathways Life Year Spill Year Spud Year

This chart shows which causes and pathways tend to result in smaller or larger spills. States with higher reporting thresholds for spills (Colorado and New Mexico) tend to have larger volumes than states with a smaller reporting threshold (North Dakota and Pennsylvania).

Spills by Pathway shows the percent of spills by pathway (hover over chart).

Pathway Details shows more details about spills with more frequent events having larger text. For example, select the "Tank" pathway shows valves to be the most common problem. "Unknown" may not show up because it is so common (text size is too large).

Causal Mechanism shows the cause behind a spill: equipment failure, human error, environmental conditions, and unknown.

Spills by Pathway

Pathway Details

Causal Mechanism

Materials Spilled explores what is spilled and whether the spill impacted water.

FracFocus Data shows the volumes of EPA regulated chemicals used for hydraulic fracturing.