Release Trend Region 8
The following graph shows the 10-year trend in quantities of TRI chemicals released by facilities located in Region 8.
Note: For comparability, trend graphs include only those chemicals that were reportable to TRI for all years presented.
For 2020, 56% of total disposal or other releases reported in Region 8 were from the metal mining sector, largely driven by one copper mine in Utah [view facility details].
From 2011 to 2020:
- Releases in Region 8 have fluctuated since 2011, largely driven by changes in the quantities of metal waste disposed of to land by metal mines. Changes in production volumes and in the chemical composition of the extracted ore can vary substantially from year to year at metal mines, impacting waste quantities reported to TRI. The 2013 spike in land disposal was driven by two metal mines in Utah.
- Excluding the metal mining sector, releases decreased by 20.4 million pounds (-16%).
- Facilities in Region 8 reported releasing 335 million pounds of TRI chemicals.
- Since 2019, releases decreased by 28.3 million pounds (-8%), driven by reduced releases to land. Nationally, releases decreased by 10%.
- 2020 was the first year facilities reported their releases and waste management practices for certain per- and polyfluoroalkyl substances (PFAS) to TRI. Three facilities in Region 8 reported for PFAS. Facilities in the region managed 3,328 pounds of PFAS as waste of which less than a pound was released.
Releases by State
The following chart shows each state’s contribution to the region’s TRI chemical release quantities for 2020.
To consider the potential health risk from chronic exposure to these releases, EPA uses a risk-screening score from the RSEI model. The following chart shows each state’s contribution to the region’s TRI chemical release quantities for 2020.
- The RSEI model accounts for factors such as a chemical's toxicity, its movement in the environment, and population density, in addition to the pounds of TRI chemicals released. RSEI models releases to the air and water but does not model land disposal quantities, which drive the high release quantities for Utah. These factors can lead to significant differences between a state’s contribution to regional releases and its contribution to the regional RSEI Score.
For information on the Region 8 facilities with the largest releases, see the Region 8 TRI Factsheet.
This page was published in March 2022 and uses the 2020 TRI National Analysis dataset made public in TRI Explorer in October 2021.