Governmental Roles and Responsibilities Related to Underground Injection and Induced Seismicity - Induced Seismicity Potential in Energy Technologies - page 98

TABLE 4.2 2010 UIC Well Inventory Sorted by the Total Number of Deep Underground Injection Wells

Total UIC Wells Class I
through Class IV
TX 108 52016 6075 4 58203
CA 45 29505 212 0 29762
KS 53 16658 145 0 16856
WY 41 4978 10552 0 15571
OK 6 10629 2 2 10639
IL 5 7843 0 0 7848
NM 5 4585 10 0 4600
NE 3 661 3913 0 4577
LA 37 3731 89 0 3857
KY 2 3403 0 0 3405
OH 10 2455 54 0 2519
IN 28 2091 0 0 2119
PA 0 1861 0 0 1861
MI 30 1460 46 0 1536
AK 29 1347 0 0 1376
MS 5 1110 0 0 1115
AR 13 1093 0 0 1106
MT 0 1062 0 0 1062
ND 4 1023 1 0 1028
CO 13 874 34 0 921
WV 0 779 21 0 800
NY 1 532 174 0 707
UT 0 428 16 8 452
MO 0 282 0 0 282
FL 212 58 0 0 270
AL 0 240 3 0 243
SD 0 87 0 0 87
VA 0 11 6 0 17
TN 0 18 0 0 18
NV 0 18 0 0 18
OR 0 9 0 7 16
AZ 0 0 15 0 15
NC 0 0 0 3 3
IA 0 3 0 0 3
WA 0 1 0 0 1
NOTE: Because fluid in Class I through Class IV wells are normally injected into formations below USDWs,
these wells can be a cause of induced seismicity. Class V wells normally inject fluid above USDWs and are
normally too shallow to create induced seismicity and are therefore excluded from this table. The 15 states
not listed here have no deep injection wells. No Class VI wells are currently in operation; however, 6-10 are
estimated by 2016.
SOURCE: EPA (2010).

State Class 1 Wells Class II Wells Class III Wells Class IV Sites