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This report is a sub-report of the PHMSA Significant Pipeline Incidents report. As such, it represents Significant Incidents (A) only over the time period and pipeline system specified.

The data source for this table is the PHMSA Filtered Incident Files. (1) (2) (3)

More Pipeline Incidents and Mileage Reports are available.

• All Pipeline Systems
• Hazardous Liquid
• Gas Transmission
• Gas Gathering
• Gas Distribution

National All Pipeline Systems: Significant Incident Details: 2006-2008

Reported Cause of Incident (C)	Number (B)	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
CORROSION, EXTERNAL	79	10.0%	2	9	$56,827,066	7.9%
CORROSION, INTERNAL	87	11.0%	0	0	$35,142,003	4.9%
Sub Total	166	21.0%	2	9	$91,969,070	12.8%
EXCAVATION DAMAGE
OPERATOR EXCAVATION DAMAGE	26	3.2%	1	8	$8,619,578	1.2%
THIRD PARTY EXCAVATION DAMAGE	112	14.1%	12	27	$42,992,913	6.0%
Sub Total	138	17.4%	13	35	$51,612,492	7.2%
INCORRECT OPERATION
INCORRECT OPERATION	45	5.7%	2	9	$8,057,177	1.1%
Sub Total	45	5.7%	2	9	$8,057,177	1.1%
MAT'L/WELD/EQUIP FAILURE
BODY OF PIPE	17	2.1%	0	5	$11,712,503	1.6%
BUTT WELD	23	2.9%	0	0	$13,060,559	1.8%
COMPONENT	25	3.1%	0	2	$25,257,184	3.5%
FILLET WELD	8	1.0%	0	0	$2,431,596	0.3%
JOINT	17	2.1%	0	0	$4,678,314	0.6%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	21	2.6%	0	0	$3,942,337	0.5%
PIPE SEAM WELD	22	2.7%	0	0	$34,636,794	4.8%
RUPTURED OR LEAKING SEAL/PUMP PACKING	21	2.6%	0	0	$17,537,471	2.4%
THREADS STRIPPED, BROKEN PIPE COUPLING	14	1.7%	0	1	$2,390,491	0.3%
Sub Total	168	21.2%	0	8	$115,647,253	16.1%
NATURAL FORCE DAMAGE
EARTH MOVEMENT	13	1.6%	0	2	$12,318,806	1.7%
HEAVY RAINS/FLOODS	22	2.7%	0	0	$63,636,398	8.9%
HIGH WINDS	8	1.0%	0	3	$137,733,772	19.2%
LIGHTNING	12	1.5%	4	1	$17,477,874	2.4%
TEMPERATURE	4	0.5%	0	0	$272,102	0.0%
Sub Total	59	7.4%	4	6	$231,438,953	32.3%
OTHER OUTSIDE FORCE DAMAGE
CAR, TRUCK OR OTHER VEHICLE NOT RELATED TO...	52	6.5%	6	13	$57,959,064	8.1%
FIRE/EXPLOSION AS PRIMARY CAUSE	5	0.6%	0	1	$323,392	0.0%
RUPTURE OF PREVIOUSLY DAMAGED PIPE	7	0.8%	0	1	$11,830,451	1.6%
VANDALISM	5	0.6%	0	4	$519,099	0.0%
Sub Total	69	8.7%	6	19	$70,632,007	9.8%
ALL OTHER CAUSES
MISCELLANEOUS	65	8.2%	1	16	$47,877,421	6.7%
UNKNOWN	78	9.8%	14	46	$97,176,313	13.6%
VARIOUS	2	0.2%	0	0	$26,304	0.0%
Sub Total	145	18.3%	15	62	$145,080,040	20.3%
Totals	790	100.0%	42	148	$714,436,994	100.0%

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• All Hazardous Liquid Systems
• Onshore Only
• Offshore Only

National Hazardous Liquid: Significant Incident Details: 2006-2008

Reported Cause of Incident (C)	Number	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
CORROSION, EXTERNAL	41	12.5%	0	2	$21,896,324	9.3%
CORROSION, INTERNAL	43	13.1%	0	0	$10,194,186	4.3%
Sub Total	84	25.6%	0	2	$32,090,511	13.6%
EXCAVATION DAMAGE
OPERATOR EXCAVATION DAMAGE	13	3.9%	0	1	$6,713,215	2.8%
THIRD PARTY EXCAVATION DAMAGE	34	10.4%	0	2	$18,286,314	7.7%
Sub Total	47	14.3%	0	3	$24,999,529	10.6%
INCORRECT OPERATION
INCORRECT OPERATION	30	9.1%	2	0	$6,150,259	2.6%
Sub Total	30	9.1%	2	0	$6,150,259	2.6%
MAT'L/WELD/EQUIP FAILURE
BODY OF PIPE	10	3.0%	0	0	$10,535,913	4.4%
BUTT WELD	7	2.1%	0	0	$1,209,895	0.5%
COMPONENT	9	2.7%	0	0	$3,640,203	1.5%
FILLET WELD	7	2.1%	0	0	$2,193,315	0.9%
JOINT	9	2.7%	0	0	$2,428,208	1.0%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	12	3.6%	0	0	$1,002,522	0.4%
PIPE SEAM WELD	17	5.2%	0	0	$33,261,597	14.1%
RUPTURED OR LEAKING SEAL/PUMP PACKING	17	5.2%	0	0	$5,485,013	2.3%
THREADS STRIPPED, BROKEN PIPE COUPLING	11	3.3%	0	0	$1,962,443	0.8%
Sub Total	99	30.2%	0	0	$61,719,113	26.2%
NATURAL FORCE DAMAGE
EARTH MOVEMENT	3	0.9%	0	0	$7,631,652	3.2%
HEAVY RAINS/FLOODS	5	1.5%	0	0	$11,448,652	4.8%
LIGHTNING	7	2.1%	0	0	$16,174,611	6.8%
TEMPERATURE	3	0.9%	0	0	$168,239	0.0%
Sub Total	18	5.5%	0	0	$35,423,156	15.0%
OTHER OUTSIDE FORCE DAMAGE
CAR, TRUCK OR OTHER VEHICLE NOT RELATED TO...	4	1.2%	1	0	$7,108,180	3.0%
FIRE/EXPLOSION AS PRIMARY CAUSE	3	0.9%	0	0	$164,176	0.0%
RUPTURE OF PREVIOUSLY DAMAGED PIPE	2	0.6%	0	0	$6,930,682	2.9%
VANDALISM	3	0.9%	0	1	$269,099	0.1%
Sub Total	12	3.6%	1	1	$14,472,138	6.1%
ALL OTHER CAUSES
MISCELLANEOUS	20	6.1%	0	0	$10,545,298	4.4%
UNKNOWN	15	4.5%	3	8	$49,644,421	21.1%
VARIOUS	2	0.6%	0	0	$26,304	0.0%
Sub Total	37	11.3%	3	8	$60,216,023	25.6%
Totals	327	100.0%	6	14	$235,070,733	100.0%

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National Hazardous Liquid Onshore: Significant Incident Details: 2006-2008

Reported Cause of Incident (C)	Number	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
CORROSION, EXTERNAL	40	12.2%	0	2	$21,774,801	9.2%
CORROSION, INTERNAL	43	13.1%	0	0	$10,194,186	4.3%
Sub Total	83	25.3%	0	2	$31,968,988	13.6%
EXCAVATION DAMAGE
OPERATOR EXCAVATION DAMAGE	13	3.9%	0	1	$6,713,215	2.8%
THIRD PARTY EXCAVATION DAMAGE	34	10.4%	0	2	$18,286,314	7.7%
Sub Total	47	14.3%	0	3	$24,999,529	10.6%
INCORRECT OPERATION
INCORRECT OPERATION	30	9.1%	2	0	$6,150,259	2.6%
Sub Total	30	9.1%	2	0	$6,150,259	2.6%
MAT'L/WELD/EQUIP FAILURE
BODY OF PIPE	10	3.0%	0	0	$10,535,913	4.4%
BUTT WELD	7	2.1%	0	0	$1,209,895	0.5%
COMPONENT	9	2.7%	0	0	$3,640,203	1.5%
FILLET WELD	7	2.1%	0	0	$2,193,315	0.9%
JOINT	9	2.7%	0	0	$2,428,208	1.0%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	12	3.6%	0	0	$1,002,522	0.4%
PIPE SEAM WELD	17	5.2%	0	0	$33,261,597	14.1%
RUPTURED OR LEAKING SEAL/PUMP PACKING	17	5.2%	0	0	$5,485,013	2.3%
THREADS STRIPPED, BROKEN PIPE COUPLING	11	3.3%	0	0	$1,962,443	0.8%
Sub Total	99	30.2%	0	0	$61,719,113	26.2%
NATURAL FORCE DAMAGE
EARTH MOVEMENT	2	0.6%	0	0	$631,652	0.2%
HEAVY RAINS/FLOODS	4	1.2%	0	0	$1,364,929	0.5%
LIGHTNING	7	2.1%	0	0	$16,174,611	6.8%
TEMPERATURE	3	0.9%	0	0	$168,239	0.0%
Sub Total	16	4.8%	0	0	$18,339,432	7.8%
OTHER OUTSIDE FORCE DAMAGE
CAR, TRUCK OR OTHER VEHICLE NOT RELATED TO...	3	0.9%	1	0	$1,370,720	0.5%
FIRE/EXPLOSION AS PRIMARY CAUSE	3	0.9%	0	0	$164,176	0.0%
RUPTURE OF PREVIOUSLY DAMAGED PIPE	2	0.6%	0	0	$6,930,682	2.9%
VANDALISM	3	0.9%	0	1	$269,099	0.1%
Sub Total	11	3.3%	1	1	$8,734,679	3.7%
ALL OTHER CAUSES
MISCELLANEOUS	19	5.8%	0	0	$9,859,534	4.1%
UNKNOWN	13	3.9%	3	8	$48,854,337	20.7%
VARIOUS	2	0.6%	0	0	$26,304	0.0%
Sub Total	34	10.4%	3	8	$58,740,176	24.9%
Totals	320	97.8%	6	14	$210,652,180	89.6%

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National Hazardous Liquid Offshore: Significant Incident Details: 2006-2008

Reported Cause of Incident (C)	Number	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
CORROSION, EXTERNAL	1	0.3%	0	0	$121,522	0.0%
Sub Total	1	0.3%	0	0	$121,522	0.0%
NATURAL FORCE DAMAGE
EARTH MOVEMENT	1	0.3%	0	0	$7,000,000	2.9%
HEAVY RAINS/FLOODS	1	0.3%	0	0	$10,083,723	4.2%
Sub Total	2	0.6%	0	0	$17,083,723	7.2%
OTHER OUTSIDE FORCE DAMAGE
CAR, TRUCK OR OTHER VEHICLE NOT RELATED TO...	1	0.3%	0	0	$5,737,459	2.4%
Sub Total	1	0.3%	0	0	$5,737,459	2.4%
ALL OTHER CAUSES
MISCELLANEOUS	1	0.3%	0	0	$685,764	0.2%
UNKNOWN	2	0.6%	0	0	$790,083	0.3%
Sub Total	3	0.9%	0	0	$1,475,847	0.6%
Totals	7	2.1%	0	0	$24,418,552	10.3%

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• All Gas Transmission Systems
• Onshore Only
• Offshore Only

National Gas Transmission: Significant Incident Details: 2006-2008

Reported Cause of Incident (C)	Number	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
CORROSION, EXTERNAL	30	13.7%	1	2	$33,041,001	12.0%
CORROSION, INTERNAL	27	12.3%	0	0	$14,018,736	5.1%
Sub Total	57	26.0%	1	2	$47,059,737	17.1%
EXCAVATION DAMAGE
OPERATOR EXCAVATION DAMAGE	8	3.6%	0	2	$1,153,384	0.4%
THIRD PARTY EXCAVATION DAMAGE	19	8.6%	4	0	$6,270,197	2.2%
Sub Total	27	12.3%	4	2	$7,423,581	2.7%
INCORRECT OPERATION
INCORRECT OPERATION	8	3.6%	0	4	$465,311	0.1%
Sub Total	8	3.6%	0	4	$465,311	0.1%
MAT'L/WELD/EQUIP FAILURE
BODY OF PIPE	4	1.8%	0	0	$655,096	0.2%
BUTT WELD	15	6.8%	0	0	$11,495,164	4.1%
COMPONENT	11	5.0%	0	1	$3,970,703	1.4%
FILLET WELD	1	0.4%	0	0	$238,280	0.0%
JOINT	6	2.7%	0	0	$1,595,302	0.5%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	6	2.7%	0	0	$2,206,067	0.8%
PIPE SEAM WELD	5	2.2%	0	0	$1,375,196	0.5%
RUPTURED OR LEAKING SEAL/PUMP PACKING	3	1.3%	0	0	$11,902,458	4.3%
THREADS STRIPPED, BROKEN PIPE COUPLING	1	0.4%	0	0	$265,359	0.1%
Sub Total	52	23.7%	0	1	$33,703,628	12.2%
NATURAL FORCE DAMAGE
EARTH MOVEMENT	4	1.8%	0	0	$2,149,490	0.7%
HEAVY RAINS/FLOODS	12	5.4%	0	0	$49,487,081	17.9%
HIGH WINDS	2	0.9%	0	0	$78,670,000	28.6%
LIGHTNING	2	0.9%	0	0	$616,423	0.2%
Sub Total	20	9.1%	0	0	$130,922,995	47.6%
OTHER OUTSIDE FORCE DAMAGE
CAR, TRUCK OR OTHER VEHICLE NOT RELATED TO...	13	5.9%	0	2	$16,902,293	6.1%
FIRE/EXPLOSION AS PRIMARY CAUSE	2	0.9%	0	1	$159,215	0.0%
RUPTURE OF PREVIOUSLY DAMAGED PIPE	2	0.9%	0	1	$1,820,158	0.6%
Sub Total	17	7.7%	0	4	$18,881,667	6.8%
ALL OTHER CAUSES
MISCELLANEOUS	25	11.4%	0	2	$27,703,324	10.0%
UNKNOWN	13	5.9%	0	1	$8,895,445	3.2%
Sub Total	38	17.3%	0	3	$36,598,770	13.3%
Totals	219	100.0%	5	16	$275,055,694	100.0%

Export Table

National Gas Transmission Onshore: Significant Incident Details: 2006-2008

Reported Cause of Incident (C)	Number	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
CORROSION, EXTERNAL	30	13.7%	1	2	$33,041,001	12.0%
CORROSION, INTERNAL	12	5.4%	0	0	$7,682,520	2.7%
Sub Total	42	19.1%	1	2	$40,723,522	14.8%
EXCAVATION DAMAGE
OPERATOR EXCAVATION DAMAGE	8	3.6%	0	2	$1,153,384	0.4%
THIRD PARTY EXCAVATION DAMAGE	19	8.6%	4	0	$6,270,197	2.2%
Sub Total	27	12.3%	4	2	$7,423,581	2.7%
INCORRECT OPERATION
INCORRECT OPERATION	8	3.6%	0	4	$465,311	0.1%
Sub Total	8	3.6%	0	4	$465,311	0.1%
MAT'L/WELD/EQUIP FAILURE
BODY OF PIPE	4	1.8%	0	0	$655,096	0.2%
BUTT WELD	12	5.4%	0	0	$10,492,455	3.8%
COMPONENT	5	2.2%	0	1	$986,749	0.3%
FILLET WELD	1	0.4%	0	0	$238,280	0.0%
JOINT	4	1.8%	0	0	$942,629	0.3%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	6	2.7%	0	0	$2,206,067	0.8%
PIPE SEAM WELD	5	2.2%	0	0	$1,375,196	0.5%
RUPTURED OR LEAKING SEAL/PUMP PACKING	3	1.3%	0	0	$11,902,458	4.3%
Sub Total	40	18.2%	0	1	$28,798,934	10.4%
NATURAL FORCE DAMAGE
EARTH MOVEMENT	4	1.8%	0	0	$2,149,490	0.7%
HEAVY RAINS/FLOODS	1	0.4%	0	0	$818,910	0.3%
HIGH WINDS	2	0.9%	0	0	$78,670,000	28.6%
LIGHTNING	2	0.9%	0	0	$616,423	0.2%
Sub Total	9	4.1%	0	0	$82,254,824	29.9%
OTHER OUTSIDE FORCE DAMAGE
CAR, TRUCK OR OTHER VEHICLE NOT RELATED TO...	8	3.6%	0	2	$8,520,443	3.1%
FIRE/EXPLOSION AS PRIMARY CAUSE	2	0.9%	0	1	$159,215	0.0%
RUPTURE OF PREVIOUSLY DAMAGED PIPE	2	0.9%	0	1	$1,820,158	0.6%
Sub Total	12	5.4%	0	4	$10,499,817	3.8%
ALL OTHER CAUSES
MISCELLANEOUS	16	7.3%	0	2	$6,555,776	2.3%
UNKNOWN	7	3.2%	0	1	$7,076,766	2.5%
Sub Total	23	10.5%	0	3	$13,632,542	4.9%
Totals	161	73.5%	5	16	$183,798,535	66.8%

Export Table

National Gas Transmission Offshore: Significant Incident Details: 2006-2008

Reported Cause of Incident (C)	Number	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
CORROSION, INTERNAL	15	6.8%	0	0	$6,336,215	2.3%
Sub Total	15	6.8%	0	0	$6,336,215	2.3%
MAT'L/WELD/EQUIP FAILURE
BUTT WELD	3	1.3%	0	0	$1,002,708	0.3%
COMPONENT	6	2.7%	0	0	$2,983,953	1.0%
JOINT	2	0.9%	0	0	$652,673	0.2%
THREADS STRIPPED, BROKEN PIPE COUPLING	1	0.4%	0	0	$265,359	0.1%
Sub Total	12	5.4%	0	0	$4,904,694	1.7%
NATURAL FORCE DAMAGE
HEAVY RAINS/FLOODS	11	5.0%	0	0	$48,668,171	17.6%
Sub Total	11	5.0%	0	0	$48,668,171	17.6%
OTHER OUTSIDE FORCE DAMAGE
CAR, TRUCK OR OTHER VEHICLE NOT RELATED TO...	5	2.2%	0	0	$8,381,850	3.0%
Sub Total	5	2.2%	0	0	$8,381,850	3.0%
ALL OTHER CAUSES
MISCELLANEOUS	9	4.1%	0	0	$21,147,548	7.6%
UNKNOWN	6	2.7%	0	0	$1,818,679	0.6%
Sub Total	15	6.8%	0	0	$22,966,227	8.3%
Totals	58	26.4%	0	0	$91,257,158	33.1%

Export Table

National Gas Gathering: Significant Incident Details: 2006-2008

Reported Cause of Incident (C)	Number	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
CORROSION, EXTERNAL	2	5.5%	0	0	$1,480,335	1.1%
CORROSION, INTERNAL	17	47.2%	0	0	$10,929,079	8.3%
Sub Total	19	52.7%	0	0	$12,409,414	9.4%
MAT'L/WELD/EQUIP FAILURE
COMPONENT	4	11.1%	0	1	$17,437,960	13.3%
JOINT	1	2.7%	0	0	$291,003	0.2%
THREADS STRIPPED, BROKEN PIPE COUPLING	1	2.7%	0	0	$159,215	0.1%
Sub Total	6	16.6%	0	1	$17,888,179	13.6%
NATURAL FORCE DAMAGE
EARTH MOVEMENT	1	2.7%	0	0	$830,000	0.6%
HIGH WINDS	1	2.7%	0	0	$36,820,000	28.1%
Sub Total	2	5.5%	0	0	$37,650,000	28.7%
OTHER OUTSIDE FORCE DAMAGE
CAR, TRUCK OR OTHER VEHICLE NOT RELATED TO...	1	2.7%	0	0	$28,198,753	21.5%
RUPTURE OF PREVIOUSLY DAMAGED PIPE	1	2.7%	0	0	$1,915,017	1.4%
Sub Total	2	5.5%	0	0	$30,113,770	22.9%
ALL OTHER CAUSES
MISCELLANEOUS	4	11.1%	0	0	$6,309,585	4.8%
UNKNOWN	3	8.3%	0	0	$26,625,957	20.3%
Sub Total	7	19.4%	0	0	$32,935,542	25.1%
Totals	36	100.0%	0	1	$130,996,907	100.0%

Export Table

National Gas Distribution: Significant Incident Details: 2006-2008

Reported Cause of Incident (C)	Number (B)	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
CORROSION, EXTERNAL	6	2.8%	1	5	$409,406	0.5%
Sub Total	6	2.8%	1	5	$409,406	0.5%
EXCAVATION DAMAGE
OPERATOR EXCAVATION DAMAGE	5	2.4%	1	5	$752,979	1.0%
THIRD PARTY EXCAVATION DAMAGE	59	28.3%	8	25	$18,436,402	25.1%
Sub Total	64	30.7%	9	30	$19,189,381	26.1%
INCORRECT OPERATION
INCORRECT OPERATION	7	3.3%	0	5	$1,441,606	1.9%
Sub Total	7	3.3%	0	5	$1,441,606	1.9%
MAT'L/WELD/EQUIP FAILURE
BODY OF PIPE	3	1.4%	0	5	$521,492	0.7%
BUTT WELD	1	0.4%	0	0	$355,500	0.4%
COMPONENT	1	0.4%	0	0	$208,317	0.2%
JOINT	1	0.4%	0	0	$363,800	0.5%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	3	1.4%	0	0	$733,746	1.0%
RUPTURED OR LEAKING SEAL/PUMP PACKING	1	0.4%	0	0	$150,000	0.2%
THREADS STRIPPED, BROKEN PIPE COUPLING	1	0.4%	0	1	$3,473	0.0%
Sub Total	11	5.2%	0	6	$2,336,330	3.1%
NATURAL FORCE DAMAGE
EARTH MOVEMENT	5	2.4%	0	2	$1,707,663	2.3%
HEAVY RAINS/FLOODS	5	2.4%	0	0	$2,700,664	3.6%
HIGH WINDS	5	2.4%	0	3	$22,243,772	30.3%
LIGHTNING	3	1.4%	4	1	$686,838	0.9%
TEMPERATURE	1	0.4%	0	0	$103,862	0.1%
Sub Total	19	9.1%	4	6	$27,442,801	37.4%
OTHER OUTSIDE FORCE DAMAGE
CAR, TRUCK OR OTHER VEHICLE NOT RELATED TO...	34	16.3%	5	11	$5,749,836	7.8%
RUPTURE OF PREVIOUSLY DAMAGED PIPE	2	0.9%	0	0	$1,164,593	1.5%
VANDALISM	2	0.9%	0	3	$250,000	0.3%
Sub Total	38	18.2%	5	14	$7,164,430	9.7%
ALL OTHER CAUSES
MISCELLANEOUS	16	7.6%	1	14	$3,319,213	4.5%
UNKNOWN	47	22.6%	11	37	$12,010,490	16.3%
Sub Total	63	30.2%	12	51	$15,329,703	20.9%
Totals	208	100.0%	31	117	$73,313,659	100.0%

Export Table

Notes

1. Significant Incidents are those incidents reported by pipeline operators with any of the following conditions are met: 1) fatality or injury requiring in-patient hospitalization. 2) $50,000 or more in total costs, measured in 1984 dollars. 3) highly volatile liquid releases of 5 barrels or more or other liquid releases of 50 barrels or more. 4) liquid releases resulting in an unintentional fire or explosion. Note: Significant Incidents include all Serious Incidents. Unless otherwise noted, any counts of Significant Incidents also include Serious Incidents.
2. Gas Distribution incidents where fire/explosion was the primary cause of failure, such as a house fire that subsequently resulted in - but was not caused by - a distribution line failure are excluded from 2004 onward. This exclusion has not been applied in years prior to 2004 due to difficulty in identifying these types of events with the older report formats.
3. PHMSA has gathered increasingly targeted incident cause data over time. As such, the available reportable categories of cause (eg: Internal/External Corrosion vs Corrosion in general) have increased over time. This report spans time periods over which the reportable cause categories have changed. The cause categories in this report should be taken as general and not specific for years prior to 2002 for Liquid and Gas Transmission, and prior to 2004 for Gas Distribution.
4. The costs for incidents prior to 2008 are presented in 2008 dollars. Cost of Gas lost is indexed via the Energy Information Administration, Natural Gas City Gate Prices. All other costs are adjusted via the Bureau of Economic Analysis, Government Printing Office inflation values.
5. For years 2002 and later, property damage is estimated as the sum of all public and private costs reported in the 30-day incident report. For years prior to 2002, accident report forms did not include a breakdown of public and private costs so property damage for these years is the reported total property damage field in the report. All costs prior to 2008 are expressed in 2008 dollars.

Sources

1. PHMSA Hazardous Liquid Flagged Incidents File - October 14, 2009
2. PHMSA Gas Transmission Flagged Incidents File - October 14, 2009
3. PHMSA Gas Distribution Flagged Incidents File - October 14, 2009

See Pipeline Incidents and Mileage Reports for more pipeline safety reports.