Information on the number of new USTs, new secondarily contained USTs, and new secondarily contained piping

Only includes USTs federally regulated under Part 280. Includes currently in use, permanently closed, and temporarily closed USTs.

UST installation dates are used. Piping only installations are not included.

Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent of 

New USTs

Percent of 

Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent of 

New USTs

Percent of 

Active 

Tanks

Region 1 Tribal 4 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 4 Tribal 61 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 5 Tribal 391 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 6 Tribal 276 28 10.1% 0 0% 0.00% 0 0% 0.00% 12 43% 4.35% 0 0% 0.00% 7 25% 2.54% 4 14% 1.45%

Region 7 Tribal 88 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 8 Tribal 577 7 1.2% 0 0% 0.00% 3 43% 0.52% 4 57% 0.69% 4 57% 0.69% 3 43% 0.52% 0 0% 0.00%

Region 9 Tribal 735 5 0.7% 0 0% 0.00% 0 0% 0.00% 1 20% 0.14% 0 0% 0.00% 0 0% 0.00% 0 0% 0.00%

Region 10 Tribal 374 6 1.6% 0 0% 0.00% 0 0% 0.00% 0 0% 0.00% 0 0% 0.00% 6 100% 1.60% 6 100% 1.60%

Alabama 18,385 179 1.0% 4 2% 0.02% n/a n/a n/a 0 0% 0.00% 0 n/a n/a 6 3% 0.03% n/a n/a n/a

Alaska 1,149 18 1.6% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Arkansas 9,840 101 1.0% 1 1% 0.01% 4 4% 0.04% 25 25% 0.25% 10 10% 0.10% 18 18% 0.18% 13 13% 0.13%

Florida 32,352 581 1.8% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Hawaii 1,925 4 0.2% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Indiana 14,588 51 0.3% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Maine 3,696 93 2.5% 24 26% 0.65% 25 27% 0.68% 1 1% 0.03% 1 1% 0.03% 68 73% 1.84% 67 72% 1.81%

Michigan 23,433 256 1.1% 49 19% 0.21% 10 4% 0.04% 20 8% 0.09% 90 35% 0.38% 176 69% 0.75% 19 7% 0.08%

Mississippi 9,159 138 1.5% 5 4% 0.05% 2 1% 0.02% 42 30% 0.46% 31 22% 0.34% 37 27% 0.40% 21 15% 0.23%

Missouri 10,660 179 1.7% 9 5% 0.08% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Nevada 3,649 127 3.5% 0 0% 0.00% n/a n/a n/a 0 0% 0.00% n/a n/a n/a 122 96% 3.34% n/a n/a n/a

Ohio 27,605 311 1.1% 144 46% 0.52% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Pennsylvania 28,095 1,377 4.9% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

South Dakota 3,173 65 2.0% 26 40% 0.82% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Tennessee 16,831 142 0.8% 3 2% 0.02% 3 2% 0.02% 55 39% 0.33% 8 6% 0.05% 48 34% 0.29% 40 28% 0.24%

Washington 9,458 138 1.5% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Summary (totals): 216,504 3,806 265 16% 0.21% 47 6% 0.07% 160 15% 0.18% 144 15% 0.17% 491 45% 0.56% 170 22% 0.26%

percentages) 1.2% 2% 0.02% 2% 0.02% 20% 0.14% 6% 0.05% 34% 0.52% 14% 0.23%

Extrapolation to all USTs:697,966 12,270 1,441 505 1,284 1,206 3,941 1,828

Lower Limit 3,806

Upper Limit 70,808

* - This category also includes USTs that have secondary containment/interstitial monitoring but that lack information about whether the piping has secondary containment/interstitial monitoring.

Interstitial Mon.

 On Both UST & Piping

Year = 2002

Sec. Cont. Interstitial Mon.

 On Piping but not on UST

Sec. Cont.

Percent 

New 

USTs of 

Active 

Tanks

State or Region New 

USTs

 On UST but not on Piping*

Sec. Cont. Interstitial Mon. Active 

Tanks
Information on the number of new USTs, new secondarily contained USTs, and new secondarily contained piping

Only includes USTs federally regulated under Part 280. Includes currently in use, permanently closed, and temporarily closed USTs.

UST installation dates are used. Piping only installations are not included.

Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent of 

New USTs

Percent of 

Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent of 

Active 

Tanks

Region 1 Tribal 4 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 4 Tribal 60 4 6.7% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0%

Region 5 Tribal 389 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 6 Tribal 281 7 2.5% 2 29% 1% 2 29% 1% 4 57% 1% 0 0% 0% 0 0% 0% 0 0% 0%

Region 7 Tribal 88 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 8 Tribal 568 3 0.5% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0% 2 67% 0% 0 0% 0%

Region 9 Tribal 694 7 1.0% 0 0% 0% 6 86% 1% 0 0% 0% 0 0% 0% 7 100% 1% 1 14% 0%

Region 10 Tribal 384 10 2.6% 0 0% 0% 2 20% 1% 0 0% 0% 4 40% 1% 10 100% 3% 4 40% 1%

Alabama 18,267 146 0.8% 3 2% 0.02% n/a n/a n/a 1 1% 0.01% n/a n/a n/a 0 0% 0.00% n/a n/a n/a

Alaska 1,120 16 1.4% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Arkansas 9,979 93 0.9% 0 0% 0% 7 8% 0% 24 26% 0% 2 2% 0% 22 24% 0% 14 15% 0%

Florida 33,248 486 1.5% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Hawaii 1,867 11 0.6% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Indiana 14,399 47 0.3% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Maine 3,513 42 1.2% 7 17% 0% 9 21% 0% 0 0% 0% 0 0% 0% 35 83% 1% 33 79% 1%

Michigan 21,862 275 1.3% 52 19% 0% 23 8% 0% 16 6% 0% 65 24% 0% 186 68% 1% 96 35% 0%

Mississippi 9,079 119 1.3% 4 3% 0% 0 0% 0% 21 18% 0% 14 12% 0% 26 22% 0% 11 9% 0%

Missouri 10,318 138 1.3% 14 10% 0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Nevada 3,696 78 2.1% 4 5% 0% n/a n/a n/a 5 6% 0% n/a n/a n/a 69 88% 2% n/a n/a n/a

Ohio 25,049 363 1.4% 159 44% 1% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Pennsylvania 27,079 852 3.1% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

South Dakota 3,027 74 2.4% 19 26% 1% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Tennessee 16,487 145 0.9% 6 4% 0.04% 3 2% 0.02% 57 39% 0.35% 7 5% 0.04% 51 35% 0.31% 41 28% 0.25%

Washington 8,457 118 1.4% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Summary (totals): 209,915 3,034 270 18% 0.22% 52 7% 0.08% 128 14% 0.15% 92 13% 0.15% 408 44% 0.48% 200 28% 0.32%

percentages) 1.3% 4% 0.04% 8% 0.09% 3% 0.04% 1% 0.01% 51% 0.33% 15% 0.14%

Extrapolation to all USTs:682,870 9,870 1,496 564 1,030 999 3,283 2,171

Lower Limit 3,034

Upper Limit 45,525

* - This category also includes USTs that have secondary containment/interstitial monitoring but that lack information about whether the piping has secondary containment/interstitial monitoring.

Sec. Cont. Interstitial Mon.

 On UST but not on Piping* On Piping but not on UST

State or Region New 

USTs

Sec. Cont. Interstitial Mon.

Year = 2003

Active 

Tanks

Sec. Cont. Interstitial Mon.

Percent 

New 

USTs of 

Active 

Tanks

 On Both UST & Piping
Information on the number of new USTs, new secondarily contained USTs, and new secondarily contained piping

Only includes USTs federally regulated under Part 280. Includes currently in use, permanently closed, and temporarily closed USTs.

UST installation dates are used. Piping only installations are not included.

Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent of 

New USTs

Percent of 

Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent of 

Active 

Tanks

Region 1 Tribal 4 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 4 Tribal 58 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 5 Tribal 367 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 6 Tribal 311 11 3.5% 0 0% 0.00% 0 0% 0.00% 3 27% 0.96% 0 0% 0.00% 6 55% 1.93% 0 0% 0.00%

Region 7 Tribal 82 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 8 Tribal 565 11 1.9% 0 0% 0.00% 0 0% 0.00% 4 36% 0.71% 2 18% 0.35% 1 9% 0.18% 0 0% 0.00%

Region 9 Tribal 690 4 0.6% 0 0% 0.00% 0 0% 0.00% 0 0% 0.00% 0 0% 0.00% 4 100% 0.58% 3 75% 0.43%

Region 10 Tribal 387 10 2.6% 0 0% 0.00% 0 0% 0.00% 0 0% 0.00% 5 50% 1.29% 10 100% 2.58% 3 30% 0.78%

Alabama 18,153 n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Alaska 1,081 8 0.7% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Arkansas 9,873 66 0.7% 1 2% 0.01% 2 3% 0.02% 14 21% 0.14% 0 0% 0.00% 19 29% 0.19% 17 26% 0.17%

Florida 32,236 628 1.9% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Hawaii 1,814 3 0.2% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Indiana 14,194 65 0.5% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Maine 3,509 55 1.6% 16 29% 0.46% 17 31% 0.48% 0 0% 0.00% 0 0% 0.00% 38 69% 1.08% 37 67% 1.05%

Michigan 21,246 344 1.6% 39 11% 0.18% 70 20% 0.33% 36 10% 0.17% 20 6% 0.09% 249 72% 1.17% 181 53% 0.85%

Mississippi 8,886 123 1.4% 5 4% 0.06% 4 3% 0.05% 24 20% 0.27% 30 24% 0.34% 24 20% 0.27% 3 2% 0.03%

Missouri 10,281 195 1.9% 9 5% 0.09% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Nevada 3,677 71 1.9% 0 0% 0.00% n/a n/a n/a 1 1% 0.03% n/a n/a n/a 70 99% 1.90% n/a n/a n/a

Ohio 24,475 312 1.3% 174 56% 0.71% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Pennsylvania 26,992 449 1.7% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

South Dakota 3,060 46 1.5% 13 28% 0.42% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Tennessee 16,279 164 1.0% 4 2% 0.02% 4 2% 0.02% 51 31% 0.31% 8 5% 0.05% 61 37% 0.37% 15 9% 0.09%

Washington 9,872 104 1.1% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Summary (totals): 208,092 2,669 261 18% 0.25% 97 12% 0.16% 133 15% 0.20% 65 8% 0.11% 482 56% 0.74% 259 33% 0.42%

percentages) 1.3% 2% 0.02% 2% 0.02% 15% 0.16% 5% 0.05% 62% 0.83% 26% 0.17%

Extrapolation to all USTs:672,297 8,623 1,700 1,056 1,367 708 4,953 2,820

Lower Limit 2,669

Upper Limit 23,779

* - This category also includes USTs that have secondary containment/interstitial monitoring but that lack information about whether the piping has secondary containment/interstitial monitoring.

Interstitial Mon.

 On UST but not on Piping* On Piping but not on UST On Both UST & Piping

State or Region New 

USTs

Sec. Cont. Interstitial Mon. Active 

Tanks

Sec. Cont. Interstitial Mon.

Percent 

New 

USTs of 

Active 

Tanks

Year = 2004

Sec. Cont.
Information on the number of new USTs, new secondarily contained USTs, and new secondarily contained piping

Only includes USTs federally regulated under Part 280. Includes currently in use, permanently closed, and temporarily closed USTs.

UST installation dates are used. Piping only installations are not included.

Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent of 

New USTs

Percent of 

Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent of 

Active 

Tanks

Region 1 Tribal 4 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 4 Tribal 61 4 6.6% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0%

Region 5 Tribal 403 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 6 Tribal 311 2 0.6% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0% 2 100% 1% 0 0% 0%

Region 7 Tribal 82 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 8 Tribal 540 5 0.9% 0 0% 0% 0 0% 0% 2 40% 0% 2 40% 0% 1 20% 0% 0 0% 0%

Region 9 Tribal 725 1 0.1% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0% 1 100% 0% 1 100% 0%

Region 10 Tribal 396 7 1.8% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0% 7 100% 2% 0 0% 0%

Alabama 18,021 n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Alaska 1,065 10 0.9% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Arkansas 9,749 82 0.8% 4 5% 0% 13 16% 0% 16 20% 0% 3 4% 0% 17 21% 0% 6 7% 0%

Florida 31,109 857 2.8% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Hawaii 1,783 3 0.2% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Indiana 14,049 83 0.6% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Maine 3,359 72 2.1% 15 21% 0% 17 24% 1% 0 0% 0% 9 13% 0% 57 79% 2% 46 64% 1%

Michigan 20,730 251 1.2% 19 8% 0% 66 26% 0% 10 4% 0% 10 4% 0% 215 86% 1% 144 57% 1%

Mississippi 8,713 119 1.4% 0 0% 0% 7 6% 0% 15 13% 0% 18 15% 0% 32 27% 0% 14 12% 0%

Missouri 10,305 201 2.0% 11 5% 0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Nevada 3,688 93 2.5% 0 0% 0% n/a n/a n/a 1 1% 0% 0 n/a n/a 92 99% 2% n/a n/a n/a

Ohio 24,025 357 1.5% 210 59% 1% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Pennsylvania 25,545 360 1.4% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

South Dakota 2,980 63 2.1% 22 35% 1% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Tennessee 16,147 n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Washington 10,397 94 0.9% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Summary (totals): 204,187 2,664 281 22% 0.33% 103 19% 0.23% 44 7% 0.09% 42 7% 0.09% 424 67% 0.88% 211 39% 0.47%

percentages) 1.1% 0% 0.00% 0% 0.00% 1% 0.01% 4% 0.03% 82% 0.51% 7% 0.06%

Extrapolation to all USTs:653,621 8,528 2,146 1,510 596 569 5,741 3,093

Lower Limit 2,664

Upper Limit 42,860

* - This category also includes USTs that have secondary containment/interstitial monitoring but that lack information about whether the piping has secondary containment/interstitial monitoring.

Sec. Cont. Interstitial Mon.

 On UST but not on Piping* On Piping but not on UST

State or Region New 

USTs

Sec. Cont. Interstitial Mon.

Year = 2005

Active 

Tanks

Sec. Cont. Interstitial Mon.

Percent 

New 

USTs of 

Active 

Tanks

 On Both UST & Piping
Information on the number of new USTs, new secondarily contained USTs, and new secondarily contained piping

Only includes USTs federally regulated under Part 280. Includes currently in use, permanently closed, and temporarily closed USTs.

UST installation dates are used. Piping only installations are not included.

Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent of 

New USTs

Percent of 

Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent of 

Active 

Tanks

Region 1 Tribal 12 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 4 Tribal 61 3 4.9% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0%

Region 5 Tribal 393 1 0.3% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 6 Tribal 301 3 1.0% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0% 2 67% 1% 0 0% 0%

Region 7 Tribal 82 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 8 Tribal 543 6 1.1% 0 0% 0% 0 0% 0% 6 100% 1% 4 67% 1% 0 0% 0% 0 0% 0%

Region 9 Tribal 720 11 1.5% 3 27% 0% 0 0% 0% 0 0% 0% 0 0% 0% 4 36% 1% 0 0% 0%

Region 10 Tribal 384 14 3.6% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0% 14 100% 4% 7 50% 2%

Alabama 19,063 n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Alaska 1,142 3 0.3% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Arkansas 9,597 75 0.8% 1 1% 0% 5 7% 0% 8 11% 0% 2 3% 0% 19 25% 0% 4 5% 0%

Florida 30,051 1,065 3.5% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Hawaii 1,755 18 1.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Indiana 14,111 93 0.7% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Maine 3,308 56 1.7% 11 20% 0% 11 20% n/a 0 0% 0% 0 0% 0% 45 80% 1% 42 75% 1%

Michigan 20,420 232 1.1% 37 16% 0% 80 34% 0% 11 5% 0% 13 6% 0% 180 78% 1% 119 51% 1%

Mississippi 8,610 121 1.4% 8 7% 0% 3 2% 0% 19 16% 0% 8 7% 0% 25 21% 0% 7 6% 0%

Missouri 10,274 206 2.0% 30 15% 0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Nevada 3,721 63 1.7% 1 2% 0% n/a n/a n/a 1 2% 0% n/a n/a n/a 61 97% 2% n/a n/a n/a

Ohio 23,594 439 1.9% 319 73% 1% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Pennsylvania 25,116 344 1.4% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

South Dakota 3,019 44 1.5% 20 45% 1% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Tennessee 17,575 n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Washington 10,299 128 1.2% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Summary (totals): 204,151 2,925 430 34% 0.51% 99 19% 0.23% 45 8% 0.09% 27 5% 0.06% 350 60% 0.73% 179 34% 0.41%

percentages) 1.3% 7% 0.09% 0% 0.00% 1% 0.01% 0% 0.00% 52% 0.61% 5% 0.04%

Extrapolation to all USTs:641,881 9,197 3,264 1,446 606 394 4,713 2,615

Lower Limit 2,925

Upper Limit 31,568

* - This category also includes USTs that have secondary containment/interstitial monitoring but that lack information about whether the piping has secondary containment/interstitial monitoring.

Interstitial Mon.

 On UST but not on Piping* On Piping but not on UST On Both UST & Piping

State or Region New 

USTs

Sec. Cont. Interstitial Mon. Active 

Tanks

Sec. Cont. Interstitial Mon.

Percent 

New 

USTs of 

Active 

Tanks

Year = 2006

Sec. Cont.
Information on the number of new USTs, new secondarily contained USTs, and new secondarily contained piping

Only includes USTs federally regulated under Part 280. Includes currently in use, permanently closed, and temporarily closed USTs.

UST installation dates are used. Piping only installations are not included.

Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent of 

New USTs

Percent of 

Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent of 

New USTs

Percent of 

Active 

Tanks

Region 1 Tribal 8 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 4 Tribal 68 1 1.5% 0 0% 0.00% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0 0 0% 0%

Region 5 Tribal 435 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 6 Tribal 314 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 7 Tribal 82 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 8 Tribal 527 4 0.8% 0 0% 0.00% 0 0% 0% 0 0% 0% 0 0% 0% 3 75% 0 0 0% 0%

Region 9 Tribal 703 8 1.1% 2 0% 25.00% 3 38% 0% 2 25% 0% 0 0% 0% 4 50% 0 3 38% 0%

Region 10 Tribal 363 0 0.0% 0 0% n/a 0 n/a 0% 0 n/a 0% 0 n/a 0% 0 n/a 0 0 n/a 0%

Alabama 18,885 n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Alaska 1,151 11 1.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Arkansas 9,455 74 0.8% 6 0% 8.11% 8 11% 0% 29 39% 0% 4 5% 0% 19 26% 0 5 7% 0%

Florida 28,862 1,118 3.9% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Hawaii 1,692 14 0.8% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Indiana 13,840 39 0.3% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Maine 3,199 97 3.0% 22 1% 22.68% 22 23% 1% 0 0% 0% 1 1% 0% 74 76% 0 73 75% 2%

Michigan 20,155 187 0.9% 32 0% 17.11% 44 24% 0% 15 8% 0% 11 6% 0% 132 71% 0 80 43% 0%

Mississippi 8,782 108 1.2% 2 0% 1.85% 0 0% 0% 9 8% 0% 31 29% 0% 63 58% 0 8 7% 0%

Missouri 10,267 140 1.4% 19 0% 13.57% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Nevada 3,669 92 2.5% 3 0% 3.26% n/a n/a n/a 0 0% 0% n/a n/a n/a 89 97% 0 n/a n/a n/a

Ohio 22,998 312 1.4% 199 1% 63.78% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Pennsylvania 24,677 308 1.2% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

South Dakota 3,021 29 1.0% 15 0% 51.72% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Tennessee 17,105 n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Washington 10,112 138 1.4% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Summary (totals): 200,370 2,680 300 29% 0.36% 77 16% 0.18% 55 10% 0.12% 47 10% 0.11% 384 67% 0.82% 169 35% 0.39%

percentages) 1.0% 0% 13.57% 11% 0.04% 4% 0.00% 1% 0.02% 64% 0.57% 7% 0.07%

Extrapolation to all USTs:629,866 8,425 2,271 1,121 738 684 5,155 2,461

Lower Limit 2,680

Upper Limit 24,399

* - This category also includes USTs that have secondary containment/interstitial monitoring but that lack information about whether the piping has secondary containment/interstitial monitoring.

Sec. Cont. Interstitial Mon. Sec. Cont. Interstitial Mon. State or Region

Year = 2007

Active 

Tanks

New 

USTs

Percent 

New 

USTs of 

Active 

Tanks

 On UST but not on Piping* On Piping but not on UST On Both UST & Piping

Sec. Cont. Interstitial Mon.
Information on the number of new USTs, new secondarily contained USTs, and new secondarily contained piping

Only includes USTs federally regulated under Part 280. Includes currently in use, permanently closed, and temporarily closed USTs.

UST installation dates are used. Piping only installations are not included.

Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent of 

New USTs

Percent of 

Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent 

of New 

USTs

Percent 

of Active 

Tanks Number

Percent of 

New USTs

Percent of 

Active 

Tanks

Region 1 Tribal 8 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 4 Tribal 65 3 4.6% 1 33% 1.54% 0 0% 0% 0 0% 0% 0 0% 0% 0 0% 0 0 0% 0%

Region 5 Tribal 435 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 6 Tribal 319 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 7 Tribal 91 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 8 Tribal 556 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Region 9 Tribal 701 1 0.1% 0 0% 0.00% 0 0% 0% 0 0% 0% 0 0% 0% 1 100% 0 0 0% 0%

Region 10 Tribal 348 4 1.1% 0 0% 0.00% 4 100% 1% 0 0% 0% 0 0% 0% 4 100% 0 0 0% 0%

Alabama 18,728 n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Alaska 1,198 11 0.9% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Arkansas 9,347 69 0.7% 4 6% 0.04% 13 19% 0% 13 19% 0% 4 6% 0% 48 70% 0 22 32% 0%

Florida 28,042 1,186 4.2% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Hawaii 1,671 0 0.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Indiana 13,685 29 0.2% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Maine 3,102 64 2.1% 10 16% 0.32% 11 17% 0% 0 0% 0% 0 0% 0% 54 84% 0 53 83% 2%

Michigan 19,797 134 0.7% 13 10% 0.07% 32 24% 0% 14 10% 0% 5 4% 0% 99 74% 0 71 53% 0%

Mississippi 8,718 123 1.4% 4 3% 0.05% 13 11% 0% 5 4% 0% 17 14% 0% 89 72% 0 36 29% 0%

Missouri 10,109 146 1.4% 38 26% 0.38% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Nevada 3,770 76 2.0% 0 0% 0.00% n/a n/a n/a 3 4% 0% n/a n/a n/a 73 96% 0 n/a n/a n/a

Ohio 23,382 206 0.9% 159 77% 0.68% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Pennsylvania 24,235 325 1.3% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

South Dakota 3,055 18 0.6% 8 44% 0.26% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Tennessee 16,978 n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Washington 10,054 98 1.0% n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a

Summary (totals): 198,394 2,493 237 28% 0.29% 73 18% 0.17% 35 7% 0.08% 26 7% 0.06% 368 78% 0.80% 182 46% 0.43%

percentages) 0.8% 10% 0.07% 17% 0.15% 2% 0.03% 0% 0.00% 79% 0.77% 29% 0.24%

Extrapolation to all USTs:623,319 7,833 1,793 1,081 476 385 5,003 2,696

Lower Limit 2,493

Upper Limit 28,769

* - This category also includes USTs that have secondary containment/interstitial monitoring but that lack information about whether the piping has secondary containment/interstitial monitoring.

Sec. Cont. Interstitial Mon. Sec. Cont. Interstitial Mon. State or Region

Year = 2008

Active 

Tanks New USTs

Percent 

New USTs 

of Active 

Tanks

 On UST but not on Piping* On Piping but not on UST On Both UST & Piping

Sec. Cont. Interstitial Mon.