HELENA, MT · Glacier County

PIEGAN BORDER STATION Water System

Current status

No open violations on record as of July 4, 2026.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace Montana’s official records. Always confirm current status with Montana before making decisions based on this information.

System facts

System ID (PWSID): MT0003334
System type: Community Water System
Population served: 94
Service connections: 21
Ownership: federal government
Water source: surface water (rivers, lakes, or reservoirs)

Violation history

Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
December 1, 2025 – December 31, 2025
Resolved
Monitoring and Reporting (DBP)
—
TTHM
January 1, 2025 – December 31, 2025
Archived
Lead Consumer Notice
—
Lead and Copper Rule
December 30, 2024 – February 4, 2025
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2022 – July 26, 2022
Resolved
Monitoring, Regular
—
1,2-Dichloroethane
January 1, 2018 – December 31, 2018
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 2018 – December 31, 2018
Resolved
Monitoring, Regular
—
o-Dichlorobenzene
January 1, 2018 – December 31, 2018
Resolved
Monitoring, Regular
—
Xylenes, Total
January 1, 2018 – December 31, 2018
Resolved
Monitoring, Regular
—
cis-1,2-Dichloroethylene
January 1, 2018 – December 31, 2018
Resolved
Monitoring, Regular
—
Toluene
January 1, 2018 – December 31, 2018
Resolved
Monitoring, Regular
—
CHLOROBENZENE
January 1, 2018 – December 31, 2018
Resolved
Monitoring, Regular
—
Trichloroethylene
January 1, 2018 – December 31, 2018
Resolved
OCCT/SOWT Study/Recommendation
Health-based
Lead and Copper Rule
July 1, 2013 – October 2, 2015
Resolved
Monitoring and Reporting (DBP)
—
TTHM
April 1, 2013 – June 30, 2013
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
April 1, 2013 – June 30, 2013
Resolved
Monitoring, Regular
—
2,4,5-TP
April 1, 2013 – June 30, 2013
Resolved
Monitoring, Regular
—
LASSO
April 1, 2013 – June 30, 2013
Resolved
Monitoring, Regular
—
Aldicarb
April 1, 2013 – June 30, 2013
Resolved
Monitoring, Regular
—
Aldicarb sulfone
April 1, 2013 – June 30, 2013
Resolved
Monitoring, Regular
—
Aldicarb sulfoxide
April 1, 2013 – June 30, 2013
Resolved
Monitoring, Regular
—
Dinoseb
April 1, 2013 – June 30, 2013
Resolved
Monitoring, Regular
—
Simazine
April 1, 2013 – June 30, 2013
Resolved
Monitoring, Regular
—
OXAMYL
April 1, 2013 – June 30, 2013
Resolved
Monitoring, Regular
—
Dalapon
April 1, 2013 – June 30, 2013
Resolved
Monitoring, Regular
—
Methoxychlor
April 1, 2013 – June 30, 2013
Resolved
Monitoring, Regular
—
BHC-GAMMA
April 1, 2013 – June 30, 2013
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
April 1, 2013 – June 30, 2013
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
January 1, 2013 – August 21, 2014
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
October 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
October 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Chlordane
October 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Pentachlorophenol
October 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Heptachlor epoxide
October 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
LASSO
October 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Aldicarb sulfone
October 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
BHC-GAMMA
October 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Endrin
October 1, 2012 – December 31, 2012
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
October 1, 2012 – May 10, 2016
Resolved
Monitoring, Regular
—
Hexachlorocyclopentadiene
October 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
October 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Toxaphene
October 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Methoxychlor
October 1, 2012 – December 31, 2012
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
August 1, 2012 – August 31, 2012
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
August 1, 2012 – August 31, 2012
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
August 1, 2012 – August 31, 2012
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
July 1, 2012 – July 31, 2012
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
July 1, 2012 – July 2, 2012
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
July 1, 2012 – July 31, 2012
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
July 1, 2012 – July 31, 2012
Resolved
Monitoring and Reporting (DBP)
—
TTHM
July 1, 2012 – September 30, 2012
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
July 1, 2012 – September 30, 2012
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Endrin
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
BHC-GAMMA
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Methoxychlor
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Toxaphene
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Dalapon
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
OXAMYL
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Simazine
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Picloram
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Dinoseb
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Hexachlorocyclopentadiene
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Aldicarb sulfoxide
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Aldicarb sulfone
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Carbofuran
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Aldicarb
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Atrazine
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
LASSO
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Heptachlor
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Heptachlor epoxide
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
2,4-D
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
2,4,5-TP
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Pentachlorophenol
July 1, 2012 – September 24, 2012
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
July 1, 2012 – September 24, 2012
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
June 1, 2012 – June 30, 2012
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
June 1, 2012 – June 30, 2012
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
May 1, 2012 – May 31, 2012
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
May 1, 2012 – May 31, 2012
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
May 1, 2012 – May 31, 2012
Resolved
Monitoring, Regular
—
BHC-GAMMA
April 1, 2012 – June 30, 2012
Resolved
Monitoring and Reporting (DBP)
—
TTHM
April 1, 2012 – June 30, 2012
Resolved
Monitoring, Regular
—
Heptachlor
April 1, 2012 – June 30, 2012
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
April 1, 2012 – June 30, 2012
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
April 1, 2012 – June 30, 2012
Resolved
Monitoring, Regular
—
Dalapon
April 1, 2012 – June 30, 2012
Resolved
Monitoring, Regular
—
Toxaphene
April 1, 2012 – June 30, 2012
Resolved
Monitoring, Regular
—
2,4-D
April 1, 2012 – June 30, 2012
Resolved
Monitoring, Regular
—
Simazine
April 1, 2012 – June 30, 2012
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
April 1, 2012 – April 30, 2012
Resolved
Monitoring, Regular
—
Aldicarb sulfoxide
April 1, 2012 – June 30, 2012
Resolved
Monitoring, Regular
—
Atrazine
April 1, 2012 – June 30, 2012
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
April 1, 2012 – June 30, 2012
Resolved
Monitoring, Regular
—
LASSO
April 1, 2012 – June 30, 2012
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
April 1, 2012 – June 30, 2012
Resolved
Monitoring, Regular
—
Chlordane
April 1, 2012 – June 30, 2012
Resolved
Monitoring, Regular
—
Pentachlorophenol
April 1, 2012 – June 30, 2012
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
April 1, 2012 – June 30, 2012
Resolved
Monitoring, Regular
—
2,4,5-TP
April 1, 2012 – June 30, 2012
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
March 1, 2012 – March 31, 2012
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
February 1, 2012 – February 29, 2012
Resolved
Monitoring, Regular
—
OXAMYL
January 1, 2012 – March 31, 2012
Resolved
Monitoring, Regular
—
1,2,4-Trichlorobenzene
January 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Xylenes, Total
January 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
January 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
o-Dichlorobenzene
January 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Vinyl chloride
January 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
trans-1,2-Dichloroethylene
January 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Carbon tetrachloride
January 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
1,2-Dichloropropane
January 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Trichloroethylene
January 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
1,1,2-Trichloroethane
January 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Tetrachloroethylene
January 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
CHLOROBENZENE
January 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Benzene
January 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Toluene
January 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Styrene
January 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Fluoride
January 1, 2012 – December 31, 2012
Resolved
Monitoring, Regular
—
Mercury
January 1, 2012 – December 31, 2012
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
January 1, 2012 – January 31, 2012
Resolved
Monitoring, Regular
—
2,4,5-TP
January 1, 2012 – March 31, 2012
Resolved
Monitoring, Regular
—
2,4-D
January 1, 2012 – March 31, 2012
Resolved
Monitoring, Regular
—
Heptachlor epoxide
January 1, 2012 – March 31, 2012
Resolved
Monitoring, Regular
—
LASSO
January 1, 2012 – March 31, 2012
Resolved
Monitoring, Regular
—
Atrazine
January 1, 2012 – March 31, 2012
Resolved
Monitoring, Regular
—
Aldicarb
January 1, 2012 – March 31, 2012
Resolved
Monitoring, Regular
—
Dinoseb
January 1, 2012 – March 31, 2012
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
January 1, 2012 – March 31, 2012
Resolved
Monitoring, Regular
—
Simazine
January 1, 2012 – March 31, 2012
Resolved
Monitoring, Regular
—
Methoxychlor
January 1, 2012 – March 31, 2012
Resolved
Monitoring, Regular
—
BHC-GAMMA
January 1, 2012 – March 31, 2012
Resolved
Monitoring, Regular
—
Endrin
January 1, 2012 – March 31, 2012
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
January 1, 2012 – March 31, 2012
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
January 1, 2012 – March 31, 2012
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
December 1, 2011 – December 31, 2011
Resolved
Monitoring and Reporting (DBP)
—
TTHM
October 1, 2011 – December 31, 2011
Resolved
Water Quality Parameter M/R
—
Lead and Copper Rule
July 1, 2011 – December 31, 2011
Archived
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
June 1, 2008 – June 30, 2008
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
June 1, 2008 – June 30, 2008
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
June 1, 2008 – June 30, 2008
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
May 1, 2008 – May 31, 2008
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
April 1, 2008 – April 30, 2008
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
April 1, 2008 – April 30, 2008
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
January 1, 2008 – January 31, 2008
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
April 1, 2007 – April 30, 2007
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
April 1, 2007 – April 30, 2007
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
January 1, 2006 – January 31, 2006
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
April 1, 2004 – April 30, 2004
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
February 1, 1997 – February 28, 1997
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
May 1, 1995 – May 31, 1995
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
May 1, 1994 – May 31, 1994
Resolved

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
December 1, 2025 – December 31, 2025	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
January 1, 2025 – December 31, 2025	Monitoring and Reporting (DBP)	TTHM	—	Archived
December 30, 2024 – February 4, 2025	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
July 1, 2022 – July 26, 2022	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2018 – December 31, 2018	Monitoring, Regular	1,2-Dichloroethane	—	Resolved
January 1, 2018 – December 31, 2018	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
January 1, 2018 – December 31, 2018	Monitoring, Regular	o-Dichlorobenzene	—	Resolved
January 1, 2018 – December 31, 2018	Monitoring, Regular	Xylenes, Total	—	Resolved
January 1, 2018 – December 31, 2018	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Resolved
January 1, 2018 – December 31, 2018	Monitoring, Regular	Toluene	—	Resolved
January 1, 2018 – December 31, 2018	Monitoring, Regular	CHLOROBENZENE	—	Resolved
January 1, 2018 – December 31, 2018	Monitoring, Regular	Trichloroethylene	—	Resolved
July 1, 2013 – October 2, 2015	OCCT/SOWT Study/Recommendation	Lead and Copper Rule	Health-based	Resolved
April 1, 2013 – June 30, 2013	Monitoring and Reporting (DBP)	TTHM	—	Resolved
April 1, 2013 – June 30, 2013	Monitoring, Regular	HEXACHLOROBENZENE	—	Resolved
April 1, 2013 – June 30, 2013	Monitoring, Regular	2,4,5-TP	—	Resolved
April 1, 2013 – June 30, 2013	Monitoring, Regular	LASSO	—	Resolved
April 1, 2013 – June 30, 2013	Monitoring, Regular	Aldicarb	—	Resolved
April 1, 2013 – June 30, 2013	Monitoring, Regular	Aldicarb sulfone	—	Resolved
April 1, 2013 – June 30, 2013	Monitoring, Regular	Aldicarb sulfoxide	—	Resolved
April 1, 2013 – June 30, 2013	Monitoring, Regular	Dinoseb	—	Resolved
April 1, 2013 – June 30, 2013	Monitoring, Regular	Simazine	—	Resolved
April 1, 2013 – June 30, 2013	Monitoring, Regular	OXAMYL	—	Resolved
April 1, 2013 – June 30, 2013	Monitoring, Regular	Dalapon	—	Resolved
April 1, 2013 – June 30, 2013	Monitoring, Regular	Methoxychlor	—	Resolved
April 1, 2013 – June 30, 2013	Monitoring, Regular	BHC-GAMMA	—	Resolved
April 1, 2013 – June 30, 2013	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
January 1, 2013 – August 21, 2014	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
October 1, 2012 – December 31, 2012	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
October 1, 2012 – December 31, 2012	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
October 1, 2012 – December 31, 2012	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
October 1, 2012 – December 31, 2012	Monitoring, Regular	Chlordane	—	Resolved
October 1, 2012 – December 31, 2012	Monitoring, Regular	Pentachlorophenol	—	Resolved
October 1, 2012 – December 31, 2012	Monitoring, Regular	Heptachlor epoxide	—	Resolved
October 1, 2012 – December 31, 2012	Monitoring, Regular	LASSO	—	Resolved
October 1, 2012 – December 31, 2012	Monitoring, Regular	Aldicarb sulfone	—	Resolved
October 1, 2012 – December 31, 2012	Monitoring, Regular	BHC-GAMMA	—	Resolved
October 1, 2012 – December 31, 2012	Monitoring, Regular	Endrin	—	Resolved
October 1, 2012 – May 10, 2016	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
October 1, 2012 – December 31, 2012	Monitoring, Regular	Hexachlorocyclopentadiene	—	Resolved
October 1, 2012 – December 31, 2012	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
October 1, 2012 – December 31, 2012	Monitoring, Regular	Toxaphene	—	Resolved
October 1, 2012 – December 31, 2012	Monitoring, Regular	Methoxychlor	—	Resolved
August 1, 2012 – August 31, 2012	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
August 1, 2012 – August 31, 2012	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
August 1, 2012 – August 31, 2012	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
July 1, 2012 – July 31, 2012	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
July 1, 2012 – July 2, 2012	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
July 1, 2012 – July 31, 2012	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
July 1, 2012 – July 31, 2012	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
July 1, 2012 – September 30, 2012	Monitoring and Reporting (DBP)	TTHM	—	Resolved
July 1, 2012 – September 30, 2012	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Endrin	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	BHC-GAMMA	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Methoxychlor	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Toxaphene	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Dalapon	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	OXAMYL	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Simazine	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Picloram	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Dinoseb	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Hexachlorocyclopentadiene	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Aldicarb sulfoxide	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Aldicarb sulfone	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Carbofuran	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Aldicarb	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Atrazine	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	LASSO	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Heptachlor	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Heptachlor epoxide	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	2,4-D	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	2,4,5-TP	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	HEXACHLOROBENZENE	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Benzo(a)pyrene	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Pentachlorophenol	—	Resolved
July 1, 2012 – September 24, 2012	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
June 1, 2012 – June 30, 2012	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
June 1, 2012 – June 30, 2012	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
May 1, 2012 – May 31, 2012	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
May 1, 2012 – May 31, 2012	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
May 1, 2012 – May 31, 2012	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	BHC-GAMMA	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring and Reporting (DBP)	TTHM	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	Heptachlor	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	Dalapon	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	Toxaphene	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	2,4-D	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	Simazine	—	Resolved
April 1, 2012 – April 30, 2012	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	Aldicarb sulfoxide	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	Atrazine	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	LASSO	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	Chlordane	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	Pentachlorophenol	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	Benzo(a)pyrene	—	Resolved
April 1, 2012 – June 30, 2012	Monitoring, Regular	2,4,5-TP	—	Resolved
March 1, 2012 – March 31, 2012	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
February 1, 2012 – February 29, 2012	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
January 1, 2012 – March 31, 2012	Monitoring, Regular	OXAMYL	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	1,2,4-Trichlorobenzene	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	Xylenes, Total	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	o-Dichlorobenzene	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	Vinyl chloride	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	Carbon tetrachloride	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	1,2-Dichloropropane	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	Trichloroethylene	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	1,1,2-Trichloroethane	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	Tetrachloroethylene	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	CHLOROBENZENE	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	Benzene	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	Toluene	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	Styrene	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	Fluoride	—	Resolved
January 1, 2012 – December 31, 2012	Monitoring, Regular	Mercury	—	Resolved
January 1, 2012 – January 31, 2012	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
January 1, 2012 – March 31, 2012	Monitoring, Regular	2,4,5-TP	—	Resolved
January 1, 2012 – March 31, 2012	Monitoring, Regular	2,4-D	—	Resolved
January 1, 2012 – March 31, 2012	Monitoring, Regular	Heptachlor epoxide	—	Resolved
January 1, 2012 – March 31, 2012	Monitoring, Regular	LASSO	—	Resolved
January 1, 2012 – March 31, 2012	Monitoring, Regular	Atrazine	—	Resolved
January 1, 2012 – March 31, 2012	Monitoring, Regular	Aldicarb	—	Resolved
January 1, 2012 – March 31, 2012	Monitoring, Regular	Dinoseb	—	Resolved
January 1, 2012 – March 31, 2012	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
January 1, 2012 – March 31, 2012	Monitoring, Regular	Simazine	—	Resolved
January 1, 2012 – March 31, 2012	Monitoring, Regular	Methoxychlor	—	Resolved
January 1, 2012 – March 31, 2012	Monitoring, Regular	BHC-GAMMA	—	Resolved
January 1, 2012 – March 31, 2012	Monitoring, Regular	Endrin	—	Resolved
January 1, 2012 – March 31, 2012	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
January 1, 2012 – March 31, 2012	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
December 1, 2011 – December 31, 2011	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
October 1, 2011 – December 31, 2011	Monitoring and Reporting (DBP)	TTHM	—	Resolved
July 1, 2011 – December 31, 2011	Water Quality Parameter M/R	Lead and Copper Rule	—	Archived
June 1, 2008 – June 30, 2008	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
June 1, 2008 – June 30, 2008	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
June 1, 2008 – June 30, 2008	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
May 1, 2008 – May 31, 2008	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
April 1, 2008 – April 30, 2008	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
April 1, 2008 – April 30, 2008	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
January 1, 2008 – January 31, 2008	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
April 1, 2007 – April 30, 2007	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
April 1, 2007 – April 30, 2007	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
January 1, 2006 – January 31, 2006	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
April 1, 2004 – April 30, 2004	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
February 1, 1997 – February 28, 1997	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
May 1, 1995 – May 31, 1995	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
May 1, 1994 – May 31, 1994	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

January 22, 2026State Public Notification requested2 linked violations
October 24, 2025State Violation/Reminder Notice2 linked violations
October 22, 2025State Violation/Reminder Notice3 linked violations
February 12, 2025State Public Notification requested2 linked violations
February 12, 2025State Compliance achieved1 linked violation
February 4, 2025State Violation/Reminder Notice1 linked violation
February 4, 2025State Compliance achieved2 linked violations
July 26, 2022State Compliance achieved2 linked violations
July 11, 2022State Violation/Reminder Notice1 linked violation
February 6, 2019State Compliance achieved22 linked violations
January 22, 2019State Public Notification requested21 linked violations
January 22, 2019State Public Notification requested1 linked violation
January 3, 2019State Compliance achieved2 linked violations
May 10, 2016State Compliance achieved3 linked violations
May 4, 2016State Compliance achieved5 linked violations
October 2, 2015State Compliance achieved2 linked violations
August 21, 2014State Compliance achieved1 linked violation
August 21, 2014State Compliance achieved3 linked violations
August 21, 2014State Compliance achieved4 linked violations
August 6, 2014State Compliance achieved2 linked violations
September 10, 2013State Compliance achieved30 linked violations
August 29, 2013State Compliance achieved2 linked violations
July 17, 2013State Public Notification requested28 linked violations
July 16, 2013State Violation/Reminder Notice3 linked violations
July 16, 2013State Public Notification received1 linked violation
July 16, 2013State Public Notification requested2 linked violations
July 16, 2013State Violation/Reminder Notice3 linked violations
July 12, 2013State Public Notification requested2 linked violations
July 12, 2013State Violation/Reminder Notice2 linked violations
May 15, 2013State Compliance achieved10 linked violations
February 7, 2013State Compliance achieved26 linked violations
January 25, 2013State Compliance achieved59 linked violations
January 16, 2013State Public Notification requested2 linked violations
January 16, 2013State Violation/Reminder Notice2 linked violations
January 14, 2013State Violation/Reminder Notice1 linked violation
January 14, 2013State Public Notification requested1 linked violation
January 11, 2013State Violation/Reminder Notice1 linked violation
January 11, 2013State Public Notification requested21 linked violations
January 11, 2013State Violation/Reminder Notice21 linked violations
January 11, 2013State Public Notification requested26 linked violations
January 11, 2013State Violation/Reminder Notice26 linked violations
January 11, 2013State Public Notification requested10 linked violations
January 11, 2013State Violation/Reminder Notice10 linked violations
January 11, 2013State Public Notification requested1 linked violation
January 11, 2013State Violation/Reminder Notice1 linked violation
January 11, 2013State Public Notification requested1 linked violation
November 14, 2012State Violation/Reminder Notice1 linked violation
October 16, 2012State Administrative/Compliance Order with penalty issued6 linked violations
October 16, 2012State Administrative/Compliance Order with penalty issued52 linked violations
October 15, 2012State Public Notification requested1 linked violation
October 15, 2012State Violation/Reminder Notice2 linked violations
October 15, 2012State Public Notification requested2 linked violations
October 15, 2012State Violation/Reminder Notice1 linked violation
October 15, 2012State Public Notification requested1 linked violation
October 15, 2012State Violation/Reminder Notice26 linked violations
October 15, 2012State Public Notification requested26 linked violations
October 15, 2012State Violation/Reminder Notice1 linked violation
September 24, 2012State Compliance achieved84 linked violations
September 14, 2012State Violation/Reminder Notice3 linked violations
September 14, 2012State Public Notification requested3 linked violations
August 14, 2012State Public Notification requested3 linked violations
August 14, 2012State Violation/Reminder Notice3 linked violations
July 24, 2012State Violation/Reminder Notice1 linked violation
July 24, 2012State Public Notification requested1 linked violation
July 16, 2012State Violation/Reminder Notice1 linked violation
July 16, 2012State Violation/Reminder Notice26 linked violations
July 16, 2012State Public Notification requested26 linked violations
July 16, 2012State Violation/Reminder Notice1 linked violation
July 16, 2012State Public Notification requested1 linked violation
July 16, 2012State Public Notification requested1 linked violation
July 13, 2012State Public Notification requested2 linked violations
July 13, 2012State Violation/Reminder Notice3 linked violations
July 13, 2012State Public Notification requested3 linked violations
July 13, 2012State Violation/Reminder Notice2 linked violations
July 12, 2012State Violation/Reminder Notice1 linked violation
July 12, 2012State Public Notification requested1 linked violation
July 2, 2012State Compliance achieved1 linked violation
June 15, 2012State Public Notification requested1 linked violation
June 15, 2012State Violation/Reminder Notice1 linked violation
June 15, 2012State Public Notification requested3 linked violations
June 15, 2012State Violation/Reminder Notice3 linked violations
June 11, 2012State Compliance achieved1 linked violation
June 11, 2012State Compliance achieved1 linked violation
May 15, 2012State Violation/Reminder Notice1 linked violation
May 15, 2012State Public Notification requested3 linked violations
May 15, 2012State Violation/Reminder Notice3 linked violations
May 15, 2012State Public Notification requested1 linked violation
April 16, 2012State Other54 linked violations
April 13, 2012State Public Notification requested2 linked violations
April 13, 2012State Violation/Reminder Notice1 linked violation
April 13, 2012State Public Notification requested2 linked violations
April 13, 2012State Violation/Reminder Notice2 linked violations
April 13, 2012State Public Notification requested26 linked violations
April 13, 2012State Violation/Reminder Notice26 linked violations
April 13, 2012State Public Notification requested1 linked violation
April 13, 2012State Violation/Reminder Notice1 linked violation
April 13, 2012State Violation/Reminder Notice2 linked violations
April 12, 2012State Public Notification requested2 linked violations
April 12, 2012State Violation/Reminder Notice2 linked violations
March 16, 2012State Public Notification requested3 linked violations
March 16, 2012State Violation/Reminder Notice3 linked violations
February 20, 2012State Violation/Reminder Notice4 linked violations
February 20, 2012State Public Notification requested4 linked violations
January 24, 2012State Public Notification requested2 linked violations
January 24, 2012State Violation/Reminder Notice3 linked violations
January 24, 2012State Violation/Reminder Notice2 linked violations
January 24, 2012State Public Notification requested3 linked violations
January 5, 2010State Compliance achieved16 linked violations
May 15, 2009State Compliance achieved6 linked violations
April 3, 2009State Compliance achieved10 linked violations
August 14, 2008State Other17 linked violations
August 6, 2008State Public Notification requested16 linked violations
August 6, 2008State Violation/Reminder Notice17 linked violations
July 31, 2006State Compliance achieved2 linked violations
July 31, 2006State Public Notification received1 linked violation
June 13, 2006State Public Notification requested1 linked violation
June 13, 2006State Public Notification requested1 linked violation
June 9, 2006State Violation/Reminder Notice1 linked violation
June 9, 2006State Violation/Reminder Notice1 linked violation
August 13, 2004State Violation/Reminder Notice2 linked violations
June 11, 2002State Compliance achieved1 linked violation
June 1, 1996State Compliance achieved1 linked violation
September 28, 1995State Violation/Reminder Notice3 linked violations
July 7, 1995State Violation/Reminder Notice3 linked violations

Contact

HILL, DANIEL

406-431-3388

HELENA, MT 59626