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 In March 2006, corrosion of a BP Exploration Alaska (BPXA) oil transit pipeline in [[Prudhoe Bay]] transporting oil to the [[Trans-Alaska Pipeline System|Trans-Alaska Pipeline]] led to a five-day leak and the largest oil spill on [[Alaska North Slope|Alaska's North Slope]].<ref name="Roach2006" /> According to the Alaska Department of Environmental Conservation (ADEC), a total of {{convert|212252|USgal|oilbbl m3}} of oil was spilled, covering {{convert|2|acre}} of the North Slope.<ref name="ADECMar2008">{{cite web |url=http://www.dec.state.ak.us/SPAR/PERP/response/sum_fy06/060302301/sitreps/060302301_sr_23.pdf |title=GC-2 Oil Transit Line Release Situation Report |date=28 March 2008 |work=dec.state.ak.us |publisher=Alaska Department of Environmental Conservation |access-date=21 January 2013}}</ref> BP admitted that cost-cutting measures had resulted in a lapse in monitoring and maintenance of the pipeline and the consequent leak. At the moment of the leak, [[pipeline inspection gauges]] (known as "pigs") had not been run through the pipeline since 1998.<ref name="Rosen2007"/><ref name="Baltimore2007">{{cite news |title=BP admits budget a factor in Alaska spill |first1=Chris |last1=Baltimore |first2=Robert |last2=Campbell |url=https://uk.reuters.com/article/uk-bp-alaska-congress/bp-admits-budget-a-factor-in-alaska-spill-idUKN1619278420070516 |archive-url=https://web.archive.org/web/20200802152233/https://uk.reuters.com/article/uk-bp-alaska-congress/bp-admits-budget-a-factor-in-alaska-spill-idUKN1619278420070516 |url-status=dead |archive-date=2 August 2020 |work=Reuters |date=16 May 2007 |access-date=21 January 2013}}</ref><ref>{{Cite news|author=Andrew Clark in New York |url=https://www.theguardian.com/environment/2007/may/01/energy.business |title=BP accused of 'draconian' cost cuts prior to Alaskan pipeline spill |work=[[The Guardian]] |date= 1 May 2007|access-date=5 June 2010 | location=London}}</ref><ref>{{cite journal |url=https://money.cnn.com/magazines/fortune/fortune_archive/2006/10/16/8388595/index.htm |title=Can BP bounce back? A disastrous leak. A deadly explosion. CEO John Browne must turn his troubled oil giant around, but time is running out. |last=Schwartz |first=Nelson D. |date=31 October 2006 |journal=Fortune |publisher=CNN |access-date=17 March 2013}}</ref> BP completed the clean-up of the spill by May 2006, including removal of contaminated gravel and vegetation, which was replaced with new material from the Arctic tundra.<ref name="ADECMar2008"/><ref name="Benschoten2006">{{cite news |title=BP Prudhoe Bay Oil Leak Cleanup Completed |author=Andrea Lyn Van Benschoten |url=http://www.manufacturing.net/articles/2006/05/bp-prudhoe-bay-oil-leak-cleanup-completed?menuid=272 |publisher=Manufacturing.net |date=22 May 2006 |access-date=22 January 2013}}</ref>
-Following the spill, the company was ordered by regulators to inspect the {{convert|35|km}} of pipelines in Prudhoe Bay using "smart pigs".<ref name="Kleiner2006">{{cite news |title=Bacteria may have eaten through Alaskan oil pipe |author=Kurt Kleiner |url=https://www.newscientist.com/article/dn9703-bacteria-may-have-eaten-through-alaskan-oil-pipe.html |work=New Scientist |date=9 August 2006 |access-date=20 January 2013}}</ref> In late July 2006, the "smart pigs" monitoring the pipelines found 16&nbsp;places where corrosion had thinned pipeline walls. A BP crew sent to inspect the pipe in early August discovered a leak and small spill,<ref name="Kleiner2006"/><ref name="Isidore2006">{{cite news |title=New worry for drivers: BP shuts oilfield |author=Chris Isidore |url=https://money.cnn.com/2006/08/07/news/international/oil_alaska/ |publisher=CNN|date=8 August 2006 |access-date=21 January 2013}}</ref> following which, BP announced that the eastern portion of the Alaskan field would be shut down for repairs on the pipeline,<ref name="Isidore2006"/><ref name="Zibel2007">{{cite news |title=BP shuts 100,000 barrels of Alaska oil |author=Alan Zibel |url=http://usatoday30.usatoday.com/money/economy/2007-05-22-2959368754_x.htm |work=[[USA Today]] |date=22 May 2007 |access-date=21 January 2013}}</ref> with approval from the [[United States Department of Transportation|Department of Transportation]]. The shutdown resulted in a reduction of {{convert|200000|oilbbl/d|m3/d}} until work began to bring the eastern field to full production on 2 October 2006.<ref name="Alaska Update">{{Cite news|url=http://usresponse.bp.com/go/doc/1249/132386/ |title=Alaska Update |publisher=BP |date=2 October 2006|id={{subscription required}}}}</ref> In total, {{convert|23|oilbbl|m3}} of oil were spilled and {{convert|176|oilbbl|m3}} were "contained and recovered", according to ADEC. The spill was cleaned up and there was no impact upon wildlife.<ref name="ADECAug2006">{{cite web |url=http://dec.alaska.gov/spar/perp/response/sum_fy07/060806301/060806301_sr_05.pdf |title=Flow Station 2 Transit Oil Line Release Situation Report |date=14 August 2006 |work=dec.state.ak.us |publisher=Alaska Department of Environmental Conservation |access-date=21 January 2013 |archive-date=2 August 2020 |archive-url=https://web.archive.org/web/20200802021119/https://dec.alaska.gov/spar/ppr/response/sum_fy07/060806301/060806301_sr_05.pdf |url-status=dead }}</ref>
+Following the spill, the company was ordered by regulators to inspect the {{convert|35|km}} of pipelines in Prudhoe Bay using "smart pigs".<ref name="Kleiner2006">{{cite news |title=Bacteria may have eaten through Alaskan oil pipe |author=Kurt Kleiner |url=https://www.newscientist.com/article/dn9703-bacteria-may-have-eaten-through-alaskan-oil-pipe.html |work=New Scientist |date=9 August 2006 |access-date=20 January 2013}}</ref> In late July 2006, the "smart pigs" monitoring the pipelines found 16&nbsp;places where corrosion had thinned pipeline walls. A BP crew sent to inspect the pipe in early August discovered a leak and small spill,<ref name="Kleiner2006"/><ref name="Isidore2006">{{cite news |title=New worry for drivers: BP shuts oilfield |author=Chris Isidore |url=https://money.cnn.com/2006/08/07/news/international/oil_alaska/ |publisher=CNN|date=8 August 2006 |access-date=21 January 2013}}</ref> following which, BP announced that the eastern portion of the Alaskan field would be shut down for repairs on the pipeline,<ref name="Isidore2006"/><ref name="Zibel2007">{{cite news |title=BP shuts 100,000 barrels of Alaska oil |author=Alan Zibel |url=http://usatoday30.usatoday.com/money/economy/2007-05-22-2959368754_x.htm |work=USA Today |date=22 May 2007 |access-date=21 January 2013}}</ref> with approval from the [[United States Department of Transportation|Department of Transportation]]. The shutdown resulted in a reduction of {{convert|200000|oilbbl/d|m3/d}} until work began to bring the eastern field to full production on 2 October 2006.<ref name="Alaska Update">{{Cite news|url=http://usresponse.bp.com/go/doc/1249/132386/ |title=Alaska Update |publisher=BP |date=2 October 2006|id={{subscription required}}}}</ref> In total, {{convert|23|oilbbl|m3}} of oil were spilled and {{convert|176|oilbbl|m3}} were "contained and recovered", according to ADEC. The spill was cleaned up and there was no impact upon wildlife.<ref name="ADECAug2006">{{cite web |url=http://dec.alaska.gov/spar/perp/response/sum_fy07/060806301/060806301_sr_05.pdf |title=Flow Station 2 Transit Oil Line Release Situation Report |date=14 August 2006 |work=dec.state.ak.us |publisher=Alaska Department of Environmental Conservation |access-date=21 January 2013 |archive-date=2 August 2020 |archive-url=https://web.archive.org/web/20200802021119/https://dec.alaska.gov/spar/ppr/response/sum_fy07/060806301/060806301_sr_05.pdf |url-status=dead }}</ref>
 After the shutdown, BP pledged to replace {{convert|26|km}} of its Alaskan oil transit pipelines<ref name="Nelson2007">{{cite news |title=BP replacing entire transit system |author=Kristen Nelson |url=http://www.petroleumnews.com/pntruncate/954556022.shtml |work=Petroleum News |date=18 February 2007 |access-date=22 January 2013}}</ref><ref name="HeraldMar2008">{{cite news|title=BP to start replacing Alaska pipelines |url=http://www.canada.com/calgaryherald/news/calgarybusiness/story.html?id=afa03605-518e-4450-844b-234254a762ed |work=Calgary Herald |date=1 March 2008 |access-date=22 January 2013 |url-status = dead|archive-url=https://web.archive.org/web/20130521044758/http://www.canada.com/calgaryherald/news/calgarybusiness/story.html?id=afa03605-518e-4450-844b-234254a762ed |archive-date=21 May 2013 }}</ref> and the company completed work on the {{convert|16|mi}} of new pipeline by the end of 2008.<ref name="BPPrudhoeBayFact">{{cite web|url=http://www.bp.com/liveassets/bp_internet/globalbp/STAGING/global_assets/downloads/A/abp_wwd_alaska_prudhoe_bay_fact_sheet.pdf |title=Greater Prudhoe Bay |year=2012 |publisher=BP |access-date=22 January 2013 |url-status = dead|archive-url=https://web.archive.org/web/20101229141741/http://www.bp.com/liveassets/bp_internet/globalbp/STAGING/global_assets/downloads/A/abp_wwd_alaska_prudhoe_bay_fact_sheet.pdf |archive-date=29 December 2010 }}</ref> In November 2007, BP Exploration, Alaska pleaded guilty to negligent discharge of oil, a misdemeanour under the federal [[Clean Water Act]] and was fined US$20&nbsp;million.<ref name="corrosion">[http://puc.sd.gov/commission/dockets/hydrocarbonpipeline/2007/Hp07-001/webexhibit8.pdf "BP fined $20 million for pipeline corrosion"], [[Anchorage Daily News]], 26 October 2007. Retrieved 11 November 2007.</ref> There was no charge brought for the smaller spill in August 2006 due to BP's quick response and clean-up.<ref name="Rosen2007">{{cite news |title=BP set to plead in Prudhoe Bay pipeline case |first=Yereth | last=Rosen |url=https://www.reuters.com/article/uk-bp-alaska/bp-set-to-plead-in-prudhoe-bay-pipeline-case-idUKN2864909420071129 | work=Reuters|date=29 November 2007 |access-date=21 January 2013}}</ref> On 16 October 2007, ADEC officials reported a "toxic spill" from a BP pipeline in Prudhoe Bay comprising {{convert|2000|USgal}} of primarily [[methanol|methanol (methyl alcohol)]] mixed with crude oil and water, which spilled onto a gravel pad and frozen tundra pond.<ref name="ktuu">{{Cite news|url=http://www.ktuu.com/Global/story.asp?S=7221594 |archive-url=https://web.archive.org/web/20071113155521/http://www.ktuu.com/Global/story.asp?S=7221594 |archive-date=13 November 2007 |title=Methanol and crude spill from Prudhoe Bay pipeline |publisher=2 News KTUU.com |agency=Associated Press |date=16 October 2007 |access-date=11 June 2010}}</ref>