Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2025-08-22 — CO
Operator
Public Service Co Of Colorado
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$130,000
Incident datetime
2025-08-22 00:00 UTC
Report number
Location
CO
Narrative
On thursday, july 24, 2025, at approximately 11:05 mst, an ignition took place following an uncontrolled gas release on a 3-inch gas transmission line during work to rebuild a regulator station located in johnstown, co. The gas release was caused by the failure of stopple equipment and was followed by an ignition. A material investigation is currently underway to determine the cause of the stopple failure.
Detailed record list
Report Received Date
2025-08-22 00:00:00
Iyear
2025
Report Number
20250094
Supplemental Number
41294
Report Type
Original
Operator Id
15931
Name
Public Service Co Of Colorado
Operator Street Address
3500 Blake St
Operator City Name
Denver
Operator State Abbreviation
CO
Operator Postal Code
80205
Time Zone
Mountain
Daylight Savings Ind
Yes
Location Latitude
40.334948
Location Longitude
-104.933258
Nrc Rpt Num
1437858
Additional Nrc Report Numbers
1437959
Commodity Released Type
Natural Gas
Unintentional Release
897
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Status When Identified
Routine Shutdown
Communication State Fed Ind
Yes
Party Initiated Communication
Operator
Ignite Ind
Yes
How Extinguished
Allowed To Burn Out
Gas Consumed By Fire In Mcf
810
Explode Ind
No
Upstream Action Taken
Valve Closure
Downstream Action Taken
Operational Control
Downstream Oprtnl Cntrl Detail
The Downstream Portion Of Pipe Was Isolated And Blown Down Prior To The Unintended Release Of Gas
Num Pub Evacuated
2
On Off Shore
Onshore
Onshore State Abbreviation
Co
Onshore Postal Code
80534
Onshore City Name
Johnstown
Onshore County Name
Weld
Designated Location
Not Applicable
Pipe Fac Name
3" West Johnstown Ms Lateral
Segment Name
3" West Johnstown Ms Lateral
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Exposed Due To Excavation
Depth Of Cover
50
Other Underground Facilities
No
Crossing
No
Pipe Facility Type
Intrastate
System Part Involved
Onshore Pipeline, Including Valve Sites
Item Involved
Tap Fitting(Stopple, Thread-O-Ring, Weld-O-Let, Etc.)
Installation Year
2025
Manufactured Year
1989
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Stopple Equipment Failure
Class Location Type
Class 2 Location
Could Be Hca
No
Pir Radius
76
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
50000
Est Cost Unintentional Release
2269
Est Cost Intentional Release
0
Est Cost Prop Damage
130000
Est Cost Emergency
20000
Est Cost Other
19000
Est Cost Other Details
Material Failure Lab Testing
Gas Cost In Mcf
2.53
Prpty
221269
Num Persons Hosp Not Ovnght
5
Num Injured Treated By Emt
0
Num Resident Building Affctd
0
Num Business Building Affctd
0
Wildlife Impact Ind
No
Accident Psig
718
Gas Flow In Pipe In Mcf
0
Mop Psig
1000
Mop Cfr Section
Other
Mop Cfr Section Details
Under Records Review
Maop Established Date
1996-01-01 00:00:00
Maop Reversal Flow Ind
No
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Gas Required Odorized Ind
Yes
Gas Odorized Ind
Yes
Upstream Valve Type Ind
Manual
Length Segment Isolated
2176
Internal Inspection Ind
No
Other Inspection Ind
Yes
Internal Inspection Details
Inadequate Commercial Availability Of 3" Ili Tools
Operation Complications Ind
Yes
Low Flow Ind
Yes
Pipeline Function
Transmission System
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
No
Scada Conf Ind
No
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Contractor Working For The Operator
Investigation Status
No, the operator did not find that an investigation of the controller(s) actions or control room issues was necessary due to: (provide an explanation for why the operator did not investigate)
Investigation Status Details
No indication that control room was a contributing factor to incident
Employee Drug Test Ind
Yes
Contractor Drug Test Ind
Yes
Num Employees Tested
2
Num Employees Failed
0
Num Contractors Tested
7
Num Contractors Failed
0
Cause
Equipment Failure
Cause Details
Malfunction Of Control/relief Equipment
Eq Failure Type
Malfunction Of Control/relief Equipment
Stopple Control Fitting Ind
Yes
Eq Additional Other Ind
Yes
Eq Additional Other Details
Under Investigation
Preparer Name
N***** G*******
Preparer Title
Principal Engineer - Gas Standards
Preparer Email
N****************@x*********.com
Preparer Telephone
303-285-8407
Authorizer Name
C********** A****
Authorizer Title
Director - Gas Standards
Authorizer Telephone
303-571-3298
Authorizer Email
C******************@x*********.com
Narrative
On thursday, july 24, 2025, at approximately 11:05 mst, an ignition took place following an uncontrolled gas release on a 3-inch gas transmission line during work to rebuild a regulator station located in johnstown, co. The gas release was caused by the failure of stopple equipment and was followed by an ignition. A material investigation is currently underway to determine the cause of the stopple failure.
| Report Received Date | 2025-08-22 00:00:00 |
|---|---|
| Iyear | 2025 |
| Report Number | 20250094 |
| Supplemental Number | 41294 |
| Report Type | Original |
| Operator Id | 15931 PHMSA Enforcement |
| Name | Public Service Co Of Colorado |
| Operator Street Address | 3500 Blake St |
| Operator City Name | Denver |
| Operator State Abbreviation | CO |
| Operator Postal Code | 80205 |
| Time Zone | Mountain |
| Daylight Savings Ind | Yes |
| Location Latitude | 40.334948 Google Maps OpenStreetMap |
| Location Longitude | -104.933258 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1437858 NRC Report How to search |
| Additional Nrc Report Numbers | 1437959 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 897 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Status When Identified | Routine Shutdown |
| Communication State Fed Ind | Yes |
| Party Initiated Communication | Operator |
| Ignite Ind | Yes |
| How Extinguished | Allowed To Burn Out |
| Gas Consumed By Fire In Mcf | 810 |
| Explode Ind | No |
| Upstream Action Taken | Valve Closure |
| Downstream Action Taken | Operational Control |
| Downstream Oprtnl Cntrl Detail | The Downstream Portion Of Pipe Was Isolated And Blown Down Prior To The Unintended Release Of Gas |
| Num Pub Evacuated | 2 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Co |
| Onshore Postal Code | 80534 |
| Onshore City Name | Johnstown |
| Onshore County Name | Weld |
| Designated Location | Not Applicable |
| Pipe Fac Name | 3" West Johnstown Ms Lateral |
| Segment Name | 3" West Johnstown Ms Lateral |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Exposed Due To Excavation |
| Depth Of Cover | 50 |
| Other Underground Facilities | No |
| Crossing | No |
| Pipe Facility Type | Intrastate |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| Item Involved | Tap Fitting(Stopple, Thread-O-Ring, Weld-O-Let, Etc.) |
| Installation Year | 2025 |
| Manufactured Year | 1989 |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Stopple Equipment Failure |
| Class Location Type | Class 2 Location |
| Could Be Hca | No |
| Pir Radius | 76 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 50000 |
| Est Cost Unintentional Release | 2269 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 130000 |
| Est Cost Emergency | 20000 |
| Est Cost Other | 19000 |
| Est Cost Other Details | Material Failure Lab Testing |
| Gas Cost In Mcf | 2.53 |
| Prpty | 221269 |
| Num Persons Hosp Not Ovnght | 5 |
| Num Injured Treated By Emt | 0 |
| Num Resident Building Affctd | 0 |
| Num Business Building Affctd | 0 |
| Wildlife Impact Ind | No |
| Accident Psig | 718 |
| Gas Flow In Pipe In Mcf | 0 |
| Mop Psig | 1000 |
| Mop Cfr Section | Other View CFR 49 §192 |
| Mop Cfr Section Details | Under Records Review |
| Maop Established Date | 1996-01-01 00:00:00 |
| Maop Reversal Flow Ind | No |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Gas Required Odorized Ind | Yes |
| Gas Odorized Ind | Yes |
| Upstream Valve Type Ind | Manual |
| Length Segment Isolated | 2176 |
| Internal Inspection Ind | No |
| Other Inspection Ind | Yes |
| Internal Inspection Details | Inadequate Commercial Availability Of 3" Ili Tools |
| Operation Complications Ind | Yes |
| Low Flow Ind | Yes |
| Pipeline Function | Transmission System |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf Ind | No |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Contractor Working For The Operator |
| Investigation Status | No, the operator did not find that an investigation of the controller(s) actions or control room issues was necessary due to: (provide an explanation for why the operator did not investigate) |
| Investigation Status Details | No indication that control room was a contributing factor to incident |
| Employee Drug Test Ind | Yes |
| Contractor Drug Test Ind | Yes |
| Num Employees Tested | 2 |
| Num Employees Failed | 0 |
| Num Contractors Tested | 7 |
| Num Contractors Failed | 0 |
| Cause | Equipment Failure |
| Cause Details | Malfunction Of Control/relief Equipment |
| Eq Failure Type | Malfunction Of Control/relief Equipment |
| Stopple Control Fitting Ind | Yes |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Under Investigation |
| Preparer Name | N***** G******* |
| Preparer Title | Principal Engineer - Gas Standards |
| Preparer Email | N****************@x*********.com |
| Preparer Telephone | 303-285-8407 |
| Authorizer Name | C********** A**** |
| Authorizer Title | Director - Gas Standards |
| Authorizer Telephone | 303-571-3298 |
| Authorizer Email | C******************@x*********.com |
| Narrative | On thursday, july 24, 2025, at approximately 11:05 mst, an ignition took place following an uncontrolled gas release on a 3-inch gas transmission line during work to rebuild a regulator station located in johnstown, co. The gas release was caused by the failure of stopple equipment and was followed by an ignition. A material investigation is currently underway to determine the cause of the stopple failure. |
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