DEP also posted formal letters on its Water Supply Determination Letters webpage notifying the owners of the two water supplies of the results of their investigation-- water supply #1 and water supply #2.
The letters identified CNX Gas Company LLC as the cause of their water issues.
The names of the owners of the water supplies were redacted from the letters to protect their privacy
The violations were issued to these CNX facilities grouped in a single complex--
-- MAM 15 Well Pad: 7 shale gas wells drilled in 2024 (3), 2026 (4): Inspection/Violation Report; Inspection/Violation Report
-- Mamont 15 Aboveground Water Storage Tank Facility + Waterlines: Inspection/Violation Report; Inspection/Violation Report
-- Mamont 16 Well Pad: 12 shale gas wells drilled in 2022 (4), 2023 (2), 2024 (2) and 2025 (4) Inspection/Violation Report; Inspection/Violation Report
The original complaints from the water supply owners were filed on December 15, 2025 and involved loss of water in both the wells.
Notices To CNX
DEP sent two formal notices of the water supply diminution investigation findings laying out the responsibilities of CNX to restore or replace the water supplies and to provide temporary water to each of the affected water supply owners-- Notice 1 and Notice 2.
The notices required CNX to, among other actions--
-- Provide temporary water to the affected residences within 24 hours;
-- Provide DEP with a Plan within 15 days to propose permanent actions to correct the problems;
-- A schedule to implement the Plan within 45 days; and
-- Submit proposed arrangements between CNX and the users, landowners and/or water purveyors of the water supply to do all necessary work for the use of a permanently restored or replaced water supply.
DEP added-- “If some or all of these restoration or replacement activities have been conducted, please provide the results of those activities along with the supporting documentation with your Restoration or Replacement Plan.”
CNX Response
On May 14, CNX Gas Company LLC provided two responses to DEP’s violations-- CNX Response 1 and CNX Response 2-- one for each water supply (names redacted).
CNX opened each response by saying-- “CNX expressly disputes the Department’s conclusion that its activities caused any alleged diminution or impact to the referenced water supply….”
“The Department has not identified the specific CNX operations, wells, or activities it contends caused the alleged impact, nor the hydrogeologic pathway by which any such impact allegedly occurred.”
CNX also alleged one “complaining” landowner “has devices installed on or in connection with their water supply system that are consistent with a history of water availability issues predating CNX’s operations.”
In addition, CNX alleged “the subject water supply well(s) are of a depth that would not ordinarily be susceptible to impact from surface or near-surface activity associated with CNX’s operations.”
CNX said “temporary water service was made available to the landowners at the onset of the complaint on or about December 15, 2025.”
CNX said one of the landowners “denied service at this time and no requests for additional water have been made since that time. CNX will continue to make temporary water available upon request, without prejudice to its position.”
CNX said the second landowner advised CNX on March 27, 2026 “that his well was producing sufficient amounts of water and that he no longer required water service. No requests for additional water have been made since that time.”
“CNX will continue to make temporary water available upon request, without prejudice to its position.”
CNX expressed concern about the potential impacts of the notices of violation on the company.
“CNX further notes that the public issuance of NOVs [notices of violation], regardless of their ultimate merit or resolution, causes immediate and concrete harm to CNX beyond the face of this proceeding.”
“The number of outstanding or historical NOVs is among the most commonly used metrics in that assessment, relied upon not only by the Department in penalty and permitting contexts, but by third-party organizations that track and publicize operator compliance data.
“An NOV that is later resolved, withdrawn, or shown to be unsupported does not automatically remove itself from those records or correct the reputational and regulatory harm caused by its initial issuance.
“CNX therefore has a concrete and ongoing interest in the prompt and accurate resolution of this matter, and in ensuring that any NOV that cannot be supported by the evidence is withdrawn rather than allowed to remain in the Department's enforcement record.”
CNX formally requested DEP withdraw the violations.
At this writing, the violations are still available online.
The Environmental Hearing Board website does not contain any appeals of the water supply determination letters by CNX or other documents related to this water supply impact case.
Difficult Compliance Record
In addition to being convicted of criminal charges, the environmental compliance record of CNX Resources and its related companies in Pennsylvania is-- difficult.
Here are a few examples--
-- Natural Gas Pipeline Pigging Facility Malfunction Dec. 27 Released 1.1 Million Cubic Feet Of Natural Gas; Same Facility Plagued Community With Blowdowns 3 Times A Day, 7 Days A Week For Nearly 10 Years Until Criminal Charges Brought Against CNX [PaEN]
-- DEP Assesses $200,000 In Penalties For Drilling Wastewater Spills By CNX In Greene County
-- DEP Assesses CNX Gas Drilling $433,500 For Violations In Greene County [PaEN]
-- CNX Gas Pays $450K In Penalties For Washington County Water Withdrawal Violations [PaEN]
-- 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]
-- Environmental Hearing Board Agrees There Is ‘Acute’ Danger In CNX Misusing A Deposition In An Appeal Before The Board To ‘Punish’ An Environmental Advocate For Her Advocacy Against CNX [PaEN]
-- Environmental Hearing Board Denies CNX Gas Company Motion To Throw Out Ullom Family Appeal Over Water Loss In Washington County; Scope Of Rebuttable Presumption Under Review [PaEN]
-- Marcellus Drilling News: Capital & Main Resolves Legal Challenge From CNX Resources Over Its Reporting With Editor’s Note Explaining What It Did Not Say Or Write About In An Article [PaEN]
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.]
Related Articles This Week:
-- PennLive - John Beauge: Attorney General Sunday Files Criminal Charges Against Eureka Resources For Oil & Gas Wastewater Leaks From Its Now Closed Standing Stone Facility In Wysox Twp., Bradford County
-- House Committee Moves Bills To Prohibit Road Dumping Contaminated Groundwater Released By Conventional Oil & Gas Well Drilling; Setting Minimum Standards For Power Plant Community Benefit Agreements; Encouraging Native Insect Habitats [PaEN]
-- State Budget Brief: DEP Oil & Gas Program Enforcement & Permitting Staff Has Been Frozen For Last 10 Years, Meanwhile Drilled Shale Gas Wells Increased By Nearly 50% [PaEN]
-- Independent Fiscal Office Estimates 2025 Act 13 Drilling Impact Fee To Yield $243.9 Million, $79.3 Million More Than In 2024 [PaEN]
NewsClips:
-- The Street: New Fortress Energy LNG Gas Bankruptcy Splits Company Into 2 Different Entities -CoreCo And BrazilCo, Records Show It Never Generated A Cent Of Positive Cash Flow [Planned PA Facilities]
-- Institute For Energy Economics & Financial Analysis: New Fortress Energy LNG Gas Company Bankruptcy Reveals Financial Misstatements, Systemic Mismanagement, Operational Failures [Planned PA Facilities]
[Posted: June 9, 2026] PA Environment Digest
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