On November 25, 36,000 gallons were lost and on December 1 another 29,000 gallons. The losses occurred when drilling was at about 110 feet deep. No mine subsidence was reported on the pipeline route that is inspected frequently by the company.
DEP’s Bureau of Abandoned Mines was again notified of the incidents.
MarkWest reported to DEP in a November 26 email that up until that point they had lost a total of 300,900 gallons of drilling fluid into mine voids from this drilling project.
With the December 1 incident that brings the total up to at least 329,900 gallons.
A DEP inspector at the site on November 26 did not observe any drilling fluid on the surface at the construction site.
These were at least the fifth and sixth incidents of this type on this pipeline construction project and they occurred during the drilling of the same general section of the pipeline as the last incident on November 21. Read more here.
No violations were issued by DEP for these latest incidents, so far.
Report Violations
To report oil and gas violations or any environmental emergency or complaint, visit DEP’s Environmental Complaint webpage.
Text photos and the location of abandoned wells to 717-788-8990.
Check These Resources
Visit DEP’s Compliance Reporting Database and Inspection Reports Viewer webpages to search their compliance records by date and owner.
Sign up for DEP’s eNOTICE service which sends you information on oil and gas and other permits submitted to DEP for review in your community.
Use DEP’s Oil and Gas Mapping Tool to find if there are oil and gas wells near or on your property and to find wells using latitude and longitude on well inspection reports.
[Note: If you believe your company was listed in error, contact DEP’s Oil and Gas Program.]
[Note: These may not be all the NOVs issued to oil and gas companies during this time period. Additional inspection reports may be added to DEP’s Oil and Gas Compliance Database.]
PA Oil & Gas Industry Public Notice Dashboards:
-- DEP: CNX Gas Suffers Shale Gas Well Casing Failure While Zipper Fracking 3 Wells In West Finley Twp., Washington County; CNX Waited Over 10 Hours To Notify DEP [PaEN]
-- DEP Issued Violations To Repsol Oil & Gas For Casing/Cementing Failures In 4 Shale Gas Wells After A 34-Hour Uncontrolled Wastewater Release At The Broadleaf Well Pad In Bradford County [PaEN]
-- DEP Issued Violations To Chesapeake Appalachia For Casing/Cementing Failures In 4 Shale Gas Wells At The Linski Well Pad In Bradford County [PaEN]
-- DEP: MarkWest Liberty Midstream Pipeline Construction Results In 36,000 And 29,000 Gallon Spills Into Coal Mine Voids Under Washington County; Total Of 329,900 Gallons Lost So Far On This Project [PaEN]
-- PA Oil & Gas Industrial Facilities: Permit Notices, Opportunities To Comment - December 6 [PaEN]
-- DEP Invites Comments On Revised Oil & Gas Erosion & Sedimentation, Stormwater Management Technical Guidance [PaEN]
-- DEP Accepting Comments On Air Quality Permit For Hill Top Energy Center Natural Gas Power Plant In Greene County To Feed A.I. Data Centers [PaEN]
-- DEP Invites Comments On Air Permit To Uprate 3 Natural Gas Turbines At Hummel Station Power Plant In Snyder County To Feed A.I. Data Centers [PaEN]
-- DEP Proposes To Renew Air Quality Permit For Constellation Energy Oil-Fired Falls Generation Station In Bucks County [PaEN]
-- Susquehanna River Basin Commission Approved 76 Shale Gas Well Pad Water Use General Permits In September & October; 398 In 2025 [PaEN]
-- DEP Posted 75 Pages Of Permit-Related Notices In December 6 PA Bulletin [PaEN]
Related Article This Week:
-- Registration Open! PA League Of Women Voters, Duquesne University Host Shale Gas & Public Health Conference Feb. 19 In Pittsburgh, Online [PaEN]
-- PA Trout Unlimited, Keystone Trails Assn., Responsible Drilling Alliance Request DEP To Hold Hearing On Permit For PA General Energy 3.9 Mile Shale Gas Access Road/Staging Area In Loyalsock State Forest, Lycoming County [PaEN]
-- EPA's Delay Of Oil & Gas Industry Methane Emissions Reductions Harms Pennsylvanians; Reactions From PA, Related Groups [PaEN]
-- Independent Fiscal Office: Quarterly PA Natural Gas Production Up 5.1% From Last Year; Natural Gas Price Up 51.4% [PaEN]
-- PUC Approves Reduced Columbia Gas Rate Hike Of 6.05%, And A Per Month Residential Customer Charge Increase Of 33% [PaEN]
-- In Case You Missed It: A.I./Data Center Articles - NewClips From Last Week - December 8 [PaEN]
NewsClips:
-- PA Capital-Star: Watchdog For PJM Electric Grid Wants A Pause On A.I. Data Centers
-- Reuters Opinion: High And Rising Natural Gas Costs May Spur Fresh Climb In US Coal Use
-- Bloomberg: There’s Too Much Oil: Who Are The Winners And Losers?
-- Broad & Liberty Guest Essay: Pennsylvania Needs More Energy And Sensible Regulation To Lure A.I. Data Centers - Gordon Tomb, Commonwealth Foundation [PA Is Already Flooded With Proposals, Electric Bills, Natural Gas Bills Surging As A Result]
-- The Allegheny Front: Ohio Landfills Take Shale Gas Drilling Waste, But Don’t Track Or Test Much Of It [PA Info Included]
[Posted: December 7, 2025] PA Environment Digest
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