Avista GD 2021

NOTICE: This report is required by 49 CFR Part 191. Failure to report may result in a civil penalty OMB No.2137-0629 as OMB NO:2137-0629
provided in 49 USC 60122. EXPIRATION DATE: 5/31/2024
Initial Date 03/04/2022
Submitted:
COU.S. Department of Transportation 2021 ANNUAL REPORT FOR CALENDAR YEAR Report
Pipeline and Hazardous Materials Submission INITIAL
Safety Administration GAS DISTRIBUTION SYSTEM Type
Date Submitted:
A federal agency may not conduct or sponsor,and a person is not required to respond to,nor shall a person be subject to a penalty for failure to comply with a collection of
information subject to the requirements of the Paperwork Reduction Act unless that collection of information displays a current valid OMB Control Number. The OMB Control
Number for this information collection is 2137-0629. Public reporting for this collection of information is estimated to be approximately 16 hours per response,including the
time for reviewing instructions,gathering the data needed,and completing and reviewing the collection of information. All responses to this collection of information are
mandatory. Send comments regarding this burden estimate or any other aspect of this collection of information,including suggestions for reducing this burden to:Information
Collection Clearance Officer,PHMSA,Office of Pipeline Safety(PHP-30)1200 New Jersey Avenue,SE,Washington,D.C.20590.
Important: Please read the separate instructions for completing this form before you begin. They clarify the information requested and provide specific
examples. If you do not have a copy of the instructions,you can obtain one from the PHMSA Pipeline Safety Community Web Page at ham://www.
ohmsa.dot.go v/ppeline/library/forms.
PART A-OPERATOR INFORMATION (DOT use only) 20220628-45645
1.Name of Operator AVISTA CORP
2.LOCATION OF OFFICE(WHERE ADDITIONAL INFORMATION MAY BE OBTAINED)
2a.Street Address 1411 E MISSION AVE
2b.City and County SPOKANE
2c.State WA
2d.Zip Code 99202
3.OPERATOR'S 5 DIGIT IDENTIFICATION NUMBER 31232
4.HEADQUARTERS NAME&ADDRESS
4a.Street Address 1411 East Mission
4b.City and County Spokane
4c.State WA
4d.Zip Code 99202
5.STATE IN WHICH SYSTEM OPERATES ID
6.THIS REPORT PERTAINS TO THE FOLLOWING COMMODITY GROUP(Select Commodity Group based on the predominant gas carried and
complete the report for that Commodity Group.File a separate report for each Commodity Group included in this OP/D.)
Natural Gas
7.THIS REPORT PERTAINS TO THE FOLLOWING TYPE OF OPERATOR(Select Type of Operator based on the structure of the company
included in this OP/D for which this report is being submitted.):
Investor Owned
ART B-SYSTEM DESCRIPTION 71
1.GENERAL
STEEL
UNPROTECTED CATHODICALLY PLASTIC CAST/ RECONDITION
DUCTILE COPPE SYSTEM
PROTECTED WROUGHT IRON R OTHER ED TOTAL
IRON CAST IRON
BARE COATED BARE COATED
MILES OF 0 0 0 534.060 1622.31 0 0 0 0 0 2156.37
MAIN
NO.OF 0 0 0 11741 74284 0 0 0 0 0 86025
SERVICES
Form PHMSA F 7100.1-1 (rev 5-2021) Reproduction of this form is permitted Pg. 1 of 4

NOTICE: This report is required by 49 CFR Part 191. Failure to report may result in a civil penalty OMB No.2137-0629 as OMB NO:2137-0629
provided in 49 USC 60122. EXPIRATION DATE: 5/31/2024
2.MILES OF MAINS IN SYSTEM AT END OF YEAR
MATERIAL UNKNOWN 2"OR LESS OVER 2" OVER 4" OVER 8" OVER 12" SYSTEM TOTALS
THRU 4" THRU 8" THRU 12"
534.06
STEEL 0 330.877 116.263 84.602 2.318 0
0
DUCTILE IRON 0 0 0 0 0 0
0
COPPER 0 0 0 0 0 0
CAST/WROUGH 0 0 0 0 0 0 0
T IRON
0
PLASTIC PVC 0 0 0 0 0 0
1622.31
PLASTIC PE 0 1203.587 294.601 124.122 0 0
0
PLASTIC ABS 0 0 0 0 0 0
PLASTIC 0 0 0 0 0 0 0
OTHER
0
OTHER 0 0 0 0 0 0
RECONDITIONE 0 0 0 0 0 0 0
D CAST IRON
2156.37
TOTAL 0 1534.464 410.864 208.724 2.318 0
Describe Other Material:
T--
3.NUMBER OF SERVICES IN SYSTEM AT END OF YEAR AVERAGE SERVICE LENGTH:89
MATERIAL UNKNOWN 1"OR LESS OVER 1" OVER 2" OVER 4" OVER 8" SYSTEM TOTALS
THRU 2" THRU 4" THRU 8"
11741
STEEL 202 11353 178 7 1 0
0
DUCTILE IRON 0 0 0 0 0 0
0
COPPER 0 0 0 0 0 0
CAST/WROUGH 0 0 0 0 0 0 0
T IRON
0
PLASTIC PVC 0 0 0 0 0 0
74284
PLASTIC PE 406 73545 317 12 4 0
0
PLASTIC ABS 0 0 0 0 0 0
PLASTIC 0 0 0 0 0 0 0
OTHER
0
OTHER 0 0 0 0 0 0
RECONDITIONE 0 0 0 0 0 0 0
D CAST IRON
86025
TOTAL 608 84898 495 19 5 0
Describe Other Material:
4.MILES OF MAIN AND NUMBER OF SERVICES BY DECADE OF INSTALLATION
Form PHMSA F 7100.1-1 (rev 5-2021) Reproduction of this form is permitted Pg. 2 of 4

NOTICE: This report is required by 49 CFR Part 191. Failure to report may result in a civil penalty OMB No.2137-0629 as OMB NO:2137-0629
provided in 49 USC 60122. EXPIRATION DATE: 5/31/2024
PRE- 1940- 1950- 1960- 1970- 1980- 1990- 2000- 2010- 2020-
UNKNOWN 1940 1949 1959 1969 1979 1989 1999 2009 2019 2029 TOTAL
MILES OF 4.816 0 0 90.35 294.197 113.526 92.772 767.103 480.129 229.527 83.95 2156.37
MAIN
NUMBER
OF 1065 0 0 695 6382 4907 5029 29122 19341 15044 4440 86025
SERVICES
PART C-TOTAL LEAKS AND HAZARDOUS LEAKS ELIMINATED/REPAIRED DURING THE YEAR
CAUSE OF LEAK MAINS SERVICES
TOTAL HAZARDOUS TOTAL HAZARDOUS
CORROSION FAILURE 0 0 0 0
NATURAL FORCE DAMAGE 2 1 11 10
EXCAVATION DAMAGE 28 28 156 154
OTHER OUTSIDE FORCE 1 1 28 20
DAMAGE
PIPE,WELD OR JOINT FAILURE 3 1 14 5
EQUIPMENT FAILURE 3 3 101 4
INCORRECT OPERATIONS 1 0 6 1
OTHER CAUSE 1 1 2 2
NUMBER OF KNOWN SYSTEM LEAKS AT END OF YEAR SCHEDULED FOR REPAIR:65
NUMBER OF HAZARDOUS LEAKS INVOLVING A MECHANICAL JOINT FAILURE: 5
PART D-EXCAVATION DAMAGE PART E-EXCESS FLOW VALUE(EFV)AND SERVICE VALVE DATA
1.TOTAL NUMBER OF EXCAVATION DAMAGES BY APPARENT Total Number Of Services with EFV Installed During Year: 1803
ROOT CAUSE: 199
a. One-Call Notification Practices Not Sufficient: 80 Estimated Number Of Services with EFV In the System At End Of Year:
19648
b. Locating Practices Not Sufficient: 17
*Total Number of Manual Service Line Shut-off Valves Installed During
c. Excavation Practices Not Sufficient: 92 Year: 43
d. Other: 10
Estimated Number of Services with Manual Service Line Shut-off Valves
Installed in the System at End of Year: 688
*These questions were added to the report in 2017.
2. NUMBER OF EXCAVATION TICKETS : 52685
PART F-LEAKS ON FEDERAL LAND PART G-PERCENT OF UNACCOUNTED FOR GAS
TOTAL NUMBER OF LEAKS ON FEDERAL LAND REPAIRED OR UNACCOUNTED FOR GAS AS A PERCENT OF TOTAL CONSUMPTION
SCHEDULED TO REPAIR: 0 FOR THE 12 MONTHS ENDING JUNE 30 OF THE REPORTING YEAR.
[(PURCHASED GAS+PRODUCED GAS)MINUS(CUSTOMER USE+
COMPANY USE+APPROPRIATE ADJUSTMENTS)]DIVIDED BY
(CUSTOMER USE+COMPANY USE+APPROPRIATE ADJUSTMENTS)
TIMES 100 EQUALS PERCENT UNACCOUNTED FOR.
FOR YEAR ENDING 6/30: 0 44°i
PART H-ADDITIONAL INFORMATION
Form PHMSA F 7100.1-1 (rev 5-2021) Reproduction of this form is permitted Pg.3 of 4

NOTICE: This report is required by 49 CFR Part 191. Failure to report may result in a civil penalty OMB No.2137-0629 as OMB NO:2137-0629
provided in 49 USC 60122. EXPIRATION DATE: 5/31/2024
Part C-148 leaks were carried over from 2020:24 were repaired in 2021,43 were non-reportable once repaired,76 were found not to be gas leaks
once investigated,and 5 were carried over into 2022.
PARTI-PREPARER
Brian Schultz,Mgr Gas Compliance&Integrity [phone]
(Preparer's Name and Title) (Area Code and Telephone Number)
[e-mail]
(Preparer's email address) (Area Code and Facsimile Number)
Form PHMSA F 7100.1-1 (rev 5-2021) Reproduction of this form is permitted Pg.4 of 4