Table 1 Oil and gas operations by state

AR

~ 890 (2012)^a

--

8,538 (gas) (2012)^b

1.15 (2012)^b

6.59 (2012)^a

200 ft. (from produced fluids storage tanks to habitable dwelling)

20 ppm (5 min.); 80 ppb (8-hr.) (H₂S)^c

~ 1,090 (2011)^a

300 ft. (from produced fluids storage tanks to school, hospital, or other public use building)

CO

4,025 (2013)^a

--

46,697 (2014)^d

1.71 (2012)^b

64.88 (2013)^a

500 ft. (from well to home or building, absent waiver)

--^{c, e}

3,775 (2012)^a

1,000 ft. (from well to high occupancy building, absent hearing and approval)

OH

903 (2012)^a

553 (2012)^a

51,739 (2012)^a

.084 (2012)^b

4.97 (2012)^a

150 ft. (occupied dwelling in urbanized area, absent consent)

--^{c, e}

690 (2011)^a

150 ft. (occupied or public dwelling, non-urban area)

200 ft. (occupied dwelling w/in drilling unit due to mandatory pooling)

PA

4,617 (2013)^a

2,174 (2013)^a

55,812 (2011)^f

2.26 (2012)^b

2.7 (2011)^a

500 ft. (from well bore to building or water well)

0.1 ppm (1-hr.); 0.005 ppm (24-hr.) (H₂S)^{c, e}

4,090 (2012)^a

WY

3,230 (Sept. 2013-Aug. 2014)^a

--

37,301 (2012)^a

2.23 (2012)^b

57.5 (2012)^a

350 ft. (from wellhead, pumping unit, pit, production tank, and/or production equipment to residence, school, or hospital)

40 μg/m³ (half-hr. ave., 2x w/in 5 days) (H₂S)^{c, e}