PENDROY, MT · Teton County

ROCKPORT COLONY 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): MT0001778
System type: Community Water System
Population served: 92
Service connections: 10
Ownership: privately owned
Water source: groundwater (wells)

Violation history

Lead Consumer Notice
—
Lead and Copper Rule
December 30, 2020 – January 15, 2021
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
December 30, 2017 – February 5, 2018
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
April 1, 2012 – June 30, 2012
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
January 1, 2012 – March 30, 2012
Resolved
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate-Nitrite
January 1, 2012 – August 20, 2012
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
October 1, 2011 – December 31, 2011
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
July 1, 2011 – September 30, 2011
Resolved
Monitoring, Regular
—
OXAMYL
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Simazine
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Picloram
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Dinoseb
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Hexachlorocyclopentadiene
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Aldicarb sulfoxide
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Aldicarb sulfone
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Carbofuran
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Aldicarb
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Atrazine
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
LASSO
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Heptachlor
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Heptachlor epoxide
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
2,4-D
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Pentachlorophenol
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Chlordane
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
1,2,4-Trichlorobenzene
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
cis-1,2-Dichloroethylene
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Xylenes, Total
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Vinyl chloride
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
trans-1,2-Dichloroethylene
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
1,2-Dichloropropane
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Trichloroethylene
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
1,1,2-Trichloroethane
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Tetrachloroethylene
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
CHLOROBENZENE
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Benzene
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Toluene
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Ethylbenzene
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Styrene
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
1,1,1-Trichloroethane
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Endrin
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
BHC-GAMMA
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Methoxychlor
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Toxaphene
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Dalapon
January 1, 2011 – January 24, 2011
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
January 1, 2011 – January 24, 2011
Resolved
Maximum Contaminant Level Violation, Single Sample
Health-based
Mercury
January 1, 2002 – December 31, 2002
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
August 1, 1995 – August 31, 1995
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
January 1, 1995 – January 31, 1995
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
December 30, 2020 – January 15, 2021	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
December 30, 2017 – February 5, 2018	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
April 1, 2012 – June 30, 2012	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
January 1, 2012 – March 30, 2012	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
January 1, 2012 – August 20, 2012	Maximum Contaminant Level Violation, Single Sample	Nitrate-Nitrite	Health-based	Resolved
October 1, 2011 – December 31, 2011	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
July 1, 2011 – September 30, 2011	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	OXAMYL	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Simazine	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Picloram	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Dinoseb	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Hexachlorocyclopentadiene	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Aldicarb sulfoxide	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Aldicarb sulfone	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Carbofuran	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Aldicarb	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Atrazine	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	LASSO	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Heptachlor	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Heptachlor epoxide	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	2,4-D	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	HEXACHLOROBENZENE	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Benzo(a)pyrene	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Pentachlorophenol	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Chlordane	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	1,2,4-Trichlorobenzene	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Xylenes, Total	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Vinyl chloride	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	1,2-Dichloropropane	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Trichloroethylene	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	1,1,2-Trichloroethane	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Tetrachloroethylene	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	CHLOROBENZENE	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Benzene	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Toluene	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Ethylbenzene	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Styrene	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	1,1,1-Trichloroethane	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Endrin	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	BHC-GAMMA	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Methoxychlor	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Toxaphene	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Dalapon	—	Resolved
January 1, 2011 – January 24, 2011	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
January 1, 2002 – December 31, 2002	Maximum Contaminant Level Violation, Single Sample	Mercury	Health-based	Resolved
August 1, 1995 – August 31, 1995	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 1995 – January 31, 1995	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

January 15, 2021State Compliance achieved1 linked violation
January 7, 2021State Violation/Reminder Notice1 linked violation
October 25, 2018State Administrative/Compliance Order without penalty issued1 linked violation
September 6, 2018State Compliance achieved1 linked violation
March 20, 2018State Other1 linked violation
March 8, 2018State Public Notification received1 linked violation
March 1, 2018State Public Notification requested1 linked violation
March 1, 2018State Violation/Reminder Notice1 linked violation
February 5, 2018State Compliance achieved1 linked violation
January 31, 2018State Violation/Reminder Notice1 linked violation
January 24, 2014State Public Notification requested47 linked violations
January 24, 2014State Violation/Reminder Notice47 linked violations
December 30, 2013State Compliance achieved4 linked violations
September 5, 2012State Administrative/Compliance Order with penalty issued5 linked violations
August 20, 2012State Compliance achieved1 linked violation
June 18, 2012State Violation/Reminder Notice1 linked violation
June 18, 2012State Public Notification requested1 linked violation
May 25, 2012State Public Notification requested2 linked violations
May 1, 2012State Public Notification received2 linked violations
April 11, 2012State Violation/Reminder Notice1 linked violation
April 11, 2012State Public Notification requested1 linked violation
March 30, 2012State Compliance achieved2 linked violations
March 22, 2012State Other5 linked violations
February 15, 2012State Violation/Reminder Notice1 linked violation
February 14, 2012State Public Notification received1 linked violation
January 24, 2012State Public Notification requested2 linked violations
November 2, 2011State Public Notification received3 linked violations
October 27, 2011State Public Notification requested1 linked violation
January 24, 2011State Compliance achieved47 linked violations
August 12, 2009State Compliance achieved3 linked violations
May 15, 2009State Compliance achieved2 linked violations
July 4, 2003State Public Notification requested3 linked violations
July 4, 2003State Violation/Reminder Notice2 linked violations
May 20, 2003State Public Notification received5 linked violations
September 8, 2001State Public Notification requested1 linked violation
September 8, 2001State Violation/Reminder Notice1 linked violation

Contact

HOFER, JACOB J

406-469-2247

PENDROY, MT 59467