WESTBY, MT · Sheridan County
WESTBY TOWN OF 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)
- MT0000355
- System type
- Community Water System
- Population served
- 172
- Service connections
- 106
- Ownership
- local government
- Water source
- surface water (rivers, lakes, or reservoirs)
Violation history
Monitoring and Reporting (DBP)
—Total Haloacetic Acids (HAA5)
January 1, 2022 – March 31, 2022
ResolvedMonitoring and Reporting (DBP)
—TTHM
January 1, 2022 – March 31, 2022
ResolvedMonitoring, Regular
—Arsenic
July 1, 2019 – September 30, 2019
ResolvedMonitoring, Regular
—Arsenic
October 1, 2018 – December 31, 2018
ResolvedLead Consumer Notice
—Lead and Copper Rule
December 30, 2015 – February 1, 2016
ResolvedMaximum Contaminant Level Violation, Average
Health-basedArsenic
January 1, 2015 – March 31, 2015
ResolvedMaximum Contaminant Level Violation, Average
Health-basedArsenic
October 1, 2014 – December 31, 2014
ResolvedFollow-up Or Routine LCR Tap M/R
—Lead and Copper Rule
October 1, 2014 – October 23, 2014
ResolvedMaximum Contaminant Level Violation, Average
Health-basedArsenic
July 1, 2014 – September 30, 2014
ResolvedMaximum Contaminant Level Violation, Average
Health-basedArsenic
April 1, 2014 – June 30, 2014
ResolvedMonitoring, Regular
—Arsenic
April 1, 2013 – June 30, 2013
ResolvedMonitoring, Regular
—Arsenic
October 1, 2012 – December 31, 2012
ResolvedMaximum Contaminant Level Violation, Average
Health-basedArsenic
July 1, 2012 – September 30, 2012
ResolvedMaximum Contaminant Level Violation, Average
Health-basedArsenic
April 1, 2012 – June 30, 2012
ResolvedMaximum Contaminant Level Violation, Average
Health-basedArsenic
January 1, 2012 – March 31, 2012
ResolvedMonitoring, Regular
—Arsenic
October 1, 2011 – December 31, 2011
ResolvedMaximum Contaminant Level Violation, Average
Health-basedArsenic
July 1, 2011 – September 30, 2011
ResolvedMaximum Contaminant Level Violation, Average
Health-basedArsenic
April 1, 2011 – June 30, 2011
ResolvedMonitoring, Regular
—Heptachlor
January 1, 2011 – September 23, 2013
ResolvedMaximum Contaminant Level Violation, Average
Health-basedArsenic
January 1, 2011 – March 31, 2011
ResolvedMonitoring, Regular
—Asbestos
January 1, 2011 – December 31, 2013
ResolvedMonitoring, Regular
—Barium
January 1, 2011 – December 31, 2013
ResolvedMonitoring, Regular
—Cadmium
January 1, 2011 – December 31, 2013
ResolvedMonitoring, Regular
—Chromium
January 1, 2011 – December 31, 2013
ResolvedMonitoring, Regular
—Fluoride
January 1, 2011 – December 31, 2013
ResolvedMonitoring, Regular
—Mercury
January 1, 2011 – December 31, 2013
ResolvedMonitoring, Regular
—Selenium
January 1, 2011 – December 31, 2013
ResolvedMonitoring, Regular
—Barium
January 1, 2011 – December 31, 2013
ResolvedMonitoring, Regular
—Cadmium
January 1, 2011 – December 31, 2013
ResolvedMonitoring, Regular
—Chromium
January 1, 2011 – December 31, 2013
ResolvedMonitoring, Regular
—Fluoride
January 1, 2011 – December 31, 2013
ResolvedMonitoring, Regular
—Mercury
January 1, 2011 – December 31, 2013
ResolvedMonitoring, Regular
—Selenium
January 1, 2011 – December 31, 2013
ResolvedMonitoring, Regular
—Endrin
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—BHC-GAMMA
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Methoxychlor
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Toxaphene
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Dalapon
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Di(2-ethylhexyl) adipate
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—OXAMYL
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Simazine
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Di(2-ethylhexyl) phthalate
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Picloram
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Dinoseb
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Hexachlorocyclopentadiene
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Aldicarb sulfoxide
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Aldicarb sulfone
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Carbofuran
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Aldicarb
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Atrazine
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—LASSO
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Heptachlor epoxide
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—2,4-D
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—2,4,5-TP
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—HEXACHLOROBENZENE
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Benzo(a)pyrene
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Pentachlorophenol
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Chlordane
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—1,2,4-Trichlorobenzene
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—cis-1,2-Dichloroethylene
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Xylenes, Total
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—DICHLOROMETHANE
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—o-Dichlorobenzene
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—p-Dichlorobenzene
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Vinyl chloride
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—1,1-Dichloroethylene
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—trans-1,2-Dichloroethylene
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—1,2-Dichloroethane
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—1,1,1-Trichloroethane
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Carbon tetrachloride
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—1,2-Dichloropropane
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Trichloroethylene
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—1,1,2-Trichloroethane
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Tetrachloroethylene
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—CHLOROBENZENE
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Benzene
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Toluene
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Ethylbenzene
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Styrene
January 1, 2011 – September 23, 2013
ResolvedMonitoring, Regular
—Arsenic
July 1, 2008 – September 30, 2008
ResolvedMonitoring, Regular
—CHLOROBENZENE
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—Ethylbenzene
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—Styrene
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—Toluene
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—Tetrachloroethylene
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—Trichloroethylene
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—1,1,2-Trichloroethane
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—Benzene
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—1,2,4-Trichlorobenzene
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—cis-1,2-Dichloroethylene
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—Xylenes, Total
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—DICHLOROMETHANE
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—o-Dichlorobenzene
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—p-Dichlorobenzene
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—Vinyl chloride
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—1,1-Dichloroethylene
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—trans-1,2-Dichloroethylene
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—1,2-Dichloroethane
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—1,1,1-Trichloroethane
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—Carbon tetrachloride
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—1,2-Dichloropropane
January 1, 2008 – October 11, 2000
ResolvedMonitoring, Regular
—Nitrate-Nitrite
January 1, 2005 – December 31, 2005
ResolvedMonitoring, Regular
—Nitrate-Nitrite
January 1, 2005 – December 31, 2005
ResolvedMonitoring, Routine Major (TCR)
—Coliform (TCR)
June 1, 1999 – June 30, 1999
ResolvedMonitoring, Regular
—2,4,5-TP
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—HEXACHLOROBENZENE
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Benzo(a)pyrene
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Pentachlorophenol
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Total Polychlorinated Biphenyls (PCB)
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—ETHYLENE DIBROMIDE
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Chlordane
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Endrin
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Methoxychlor
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Toxaphene
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Dalapon
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Diquat
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Glyphosate
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—OXAMYL
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Simazine
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Di(2-ethylhexyl) phthalate
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Hexachlorocyclopentadiene
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Aldicarb sulfoxide
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Aldicarb sulfone
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Carbofuran
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Atrazine
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Heptachlor
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Heptachlor epoxide
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—HEXACHLOROBENZENE
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Benzo(a)pyrene
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Pentachlorophenol
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Total Polychlorinated Biphenyls (PCB)
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—1,2-DIBROMO-3-CHLOROPROPANE
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—ETHYLENE DIBROMIDE
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Chlordane
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—LASSO
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Endothall
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Aldicarb sulfone
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Aldicarb sulfoxide
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Hexachlorocyclopentadiene
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Dinoseb
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Picloram
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Di(2-ethylhexyl) phthalate
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Simazine
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—OXAMYL
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Diquat
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Dalapon
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Toxaphene
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Methoxychlor
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—BHC-GAMMA
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Endrin
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Di(2-ethylhexyl) adipate
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Glyphosate
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Carbofuran
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Aldicarb
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Atrazine
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—2,3,7,8-TCDD
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Heptachlor
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—Heptachlor epoxide
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Regular
—2,4-D
January 1, 1999 – December 31, 2001
ResolvedMonitoring, Routine Major (TCR)
—Coliform (TCR)
June 1, 1997 – June 30, 1997
ResolvedMonitoring, Routine Minor (TCR)
—Coliform (TCR)
May 1, 1997 – May 31, 1997
ResolvedMonitoring, Routine Major (TCR)
—Coliform (TCR)
February 1, 1994 – February 28, 1994
Resolved
Resolved addressed and confirmed by the state
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| January 1, 2022 – March 31, 2022 | Monitoring and Reporting (DBP) | Total Haloacetic Acids (HAA5) | — | Resolved |
| January 1, 2022 – March 31, 2022 | Monitoring and Reporting (DBP) | TTHM | — | Resolved |
| July 1, 2019 – September 30, 2019 | Monitoring, Regular | Arsenic | — | Resolved |
| October 1, 2018 – December 31, 2018 | Monitoring, Regular | Arsenic | — | Resolved |
| December 30, 2015 – February 1, 2016 | Lead Consumer Notice | Lead and Copper Rule | — | Resolved |
| January 1, 2015 – March 31, 2015 | Maximum Contaminant Level Violation, Average | Arsenic | Health-based | Resolved |
| October 1, 2014 – December 31, 2014 | Maximum Contaminant Level Violation, Average | Arsenic | Health-based | Resolved |
| October 1, 2014 – October 23, 2014 | Follow-up Or Routine LCR Tap M/R | Lead and Copper Rule | — | Resolved |
| July 1, 2014 – September 30, 2014 | Maximum Contaminant Level Violation, Average | Arsenic | Health-based | Resolved |
| April 1, 2014 – June 30, 2014 | Maximum Contaminant Level Violation, Average | Arsenic | Health-based | Resolved |
| April 1, 2013 – June 30, 2013 | Monitoring, Regular | Arsenic | — | Resolved |
| October 1, 2012 – December 31, 2012 | Monitoring, Regular | Arsenic | — | Resolved |
| July 1, 2012 – September 30, 2012 | Maximum Contaminant Level Violation, Average | Arsenic | Health-based | Resolved |
| April 1, 2012 – June 30, 2012 | Maximum Contaminant Level Violation, Average | Arsenic | Health-based | Resolved |
| January 1, 2012 – March 31, 2012 | Maximum Contaminant Level Violation, Average | Arsenic | Health-based | Resolved |
| October 1, 2011 – December 31, 2011 | Monitoring, Regular | Arsenic | — | Resolved |
| July 1, 2011 – September 30, 2011 | Maximum Contaminant Level Violation, Average | Arsenic | Health-based | Resolved |
| April 1, 2011 – June 30, 2011 | Maximum Contaminant Level Violation, Average | Arsenic | Health-based | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Heptachlor | — | Resolved |
| January 1, 2011 – March 31, 2011 | Maximum Contaminant Level Violation, Average | Arsenic | Health-based | Resolved |
| January 1, 2011 – December 31, 2013 | Monitoring, Regular | Asbestos | — | Resolved |
| January 1, 2011 – December 31, 2013 | Monitoring, Regular | Barium | — | Resolved |
| January 1, 2011 – December 31, 2013 | Monitoring, Regular | Cadmium | — | Resolved |
| January 1, 2011 – December 31, 2013 | Monitoring, Regular | Chromium | — | Resolved |
| January 1, 2011 – December 31, 2013 | Monitoring, Regular | Fluoride | — | Resolved |
| January 1, 2011 – December 31, 2013 | Monitoring, Regular | Mercury | — | Resolved |
| January 1, 2011 – December 31, 2013 | Monitoring, Regular | Selenium | — | Resolved |
| January 1, 2011 – December 31, 2013 | Monitoring, Regular | Barium | — | Resolved |
| January 1, 2011 – December 31, 2013 | Monitoring, Regular | Cadmium | — | Resolved |
| January 1, 2011 – December 31, 2013 | Monitoring, Regular | Chromium | — | Resolved |
| January 1, 2011 – December 31, 2013 | Monitoring, Regular | Fluoride | — | Resolved |
| January 1, 2011 – December 31, 2013 | Monitoring, Regular | Mercury | — | Resolved |
| January 1, 2011 – December 31, 2013 | Monitoring, Regular | Selenium | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Endrin | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | BHC-GAMMA | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Methoxychlor | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Toxaphene | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Dalapon | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Di(2-ethylhexyl) adipate | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | OXAMYL | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Simazine | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Di(2-ethylhexyl) phthalate | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Picloram | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Dinoseb | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Hexachlorocyclopentadiene | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Aldicarb sulfoxide | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Aldicarb sulfone | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Carbofuran | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Aldicarb | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Atrazine | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | LASSO | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Heptachlor epoxide | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | 2,4-D | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | 2,4,5-TP | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | HEXACHLOROBENZENE | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Benzo(a)pyrene | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Pentachlorophenol | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Chlordane | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | 1,2,4-Trichlorobenzene | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | cis-1,2-Dichloroethylene | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Xylenes, Total | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | DICHLOROMETHANE | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | o-Dichlorobenzene | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | p-Dichlorobenzene | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Vinyl chloride | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | 1,1-Dichloroethylene | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | trans-1,2-Dichloroethylene | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | 1,2-Dichloroethane | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | 1,1,1-Trichloroethane | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Carbon tetrachloride | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | 1,2-Dichloropropane | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Trichloroethylene | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | 1,1,2-Trichloroethane | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Tetrachloroethylene | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | CHLOROBENZENE | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Benzene | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Toluene | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Ethylbenzene | — | Resolved |
| January 1, 2011 – September 23, 2013 | Monitoring, Regular | Styrene | — | Resolved |
| July 1, 2008 – September 30, 2008 | Monitoring, Regular | Arsenic | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | CHLOROBENZENE | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | Ethylbenzene | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | Styrene | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | Toluene | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | Tetrachloroethylene | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | Trichloroethylene | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | 1,1,2-Trichloroethane | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | Benzene | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | 1,2,4-Trichlorobenzene | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | cis-1,2-Dichloroethylene | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | Xylenes, Total | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | DICHLOROMETHANE | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | o-Dichlorobenzene | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | p-Dichlorobenzene | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | Vinyl chloride | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | 1,1-Dichloroethylene | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | trans-1,2-Dichloroethylene | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | 1,2-Dichloroethane | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | 1,1,1-Trichloroethane | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | Carbon tetrachloride | — | Resolved |
| January 1, 2008 – October 11, 2000 | Monitoring, Regular | 1,2-Dichloropropane | — | Resolved |
| January 1, 2005 – December 31, 2005 | Monitoring, Regular | Nitrate-Nitrite | — | Resolved |
| January 1, 2005 – December 31, 2005 | Monitoring, Regular | Nitrate-Nitrite | — | Resolved |
| June 1, 1999 – June 30, 1999 | Monitoring, Routine Major (TCR) | Coliform (TCR) | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | 2,4,5-TP | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | HEXACHLOROBENZENE | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Benzo(a)pyrene | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Pentachlorophenol | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Total Polychlorinated Biphenyls (PCB) | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | ETHYLENE DIBROMIDE | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Chlordane | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Endrin | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Methoxychlor | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Toxaphene | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Dalapon | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Diquat | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Glyphosate | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | OXAMYL | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Simazine | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Di(2-ethylhexyl) phthalate | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Hexachlorocyclopentadiene | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Aldicarb sulfoxide | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Aldicarb sulfone | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Carbofuran | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Atrazine | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Heptachlor | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Heptachlor epoxide | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | HEXACHLOROBENZENE | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Benzo(a)pyrene | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Pentachlorophenol | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Total Polychlorinated Biphenyls (PCB) | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | 1,2-DIBROMO-3-CHLOROPROPANE | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | ETHYLENE DIBROMIDE | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Chlordane | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | LASSO | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Endothall | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Aldicarb sulfone | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Aldicarb sulfoxide | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Hexachlorocyclopentadiene | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Dinoseb | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Picloram | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Di(2-ethylhexyl) phthalate | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Simazine | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | OXAMYL | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Diquat | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Dalapon | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Toxaphene | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Methoxychlor | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | BHC-GAMMA | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Endrin | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Di(2-ethylhexyl) adipate | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Glyphosate | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Carbofuran | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Aldicarb | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Atrazine | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | 2,3,7,8-TCDD | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Heptachlor | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | Heptachlor epoxide | — | Resolved |
| January 1, 1999 – December 31, 2001 | Monitoring, Regular | 2,4-D | — | Resolved |
| June 1, 1997 – June 30, 1997 | Monitoring, Routine Major (TCR) | Coliform (TCR) | — | Resolved |
| May 1, 1997 – May 31, 1997 | Monitoring, Routine Minor (TCR) | Coliform (TCR) | — | Resolved |
| February 1, 1994 – February 28, 1994 | Monitoring, Routine Major (TCR) | Coliform (TCR) | — | Resolved |
Resolved addressed and confirmed by the state
Enforcement actions
- April 18, 2022State Compliance achieved2 linked violations
- April 14, 2022State Public Notification requested2 linked violations
- April 14, 2022State Violation/Reminder Notice2 linked violations
- March 24, 2020State no additional Formal Action needed10 linked violations
- November 18, 2019State Compliance achieved1 linked violation
- October 17, 2019State Violation/Reminder Notice1 linked violation
- October 17, 2019State Public Notification requested1 linked violation
- February 20, 2019State Compliance achieved1 linked violation
- January 22, 2019State Public Notification requested1 linked violation
- January 22, 2019State Violation/Reminder Notice1 linked violation
- February 1, 2016State Compliance achieved1 linked violation
- February 1, 2016State Violation/Reminder Notice1 linked violation
- July 6, 2015State Public Notification received1 linked violation
- June 23, 2015State Compliance achieved2 linked violations
- June 23, 2015State Compliance achieved2 linked violations
- June 23, 2015State Violation/Reminder Notice21 linked violations
- June 23, 2015State Compliance achieved2 linked violations
- May 20, 2015State Compliance achieved1 linked violation
- May 20, 2015State Compliance achieved8 linked violations
- March 31, 2015State Public Notification requested2 linked violations
- March 31, 2015State Violation/Reminder Notice1 linked violation
- January 12, 2015State Public Notification received1 linked violation
- December 23, 2014State Public Notification requested1 linked violation
- December 23, 2014State Violation/Reminder Notice1 linked violation
- October 28, 2014State Public Notification received1 linked violation
- October 23, 2014State Compliance achieved1 linked violation
- October 23, 2014State Public Notification requested1 linked violation
- October 23, 2014State Violation/Reminder Notice1 linked violation
- September 30, 2014State Public Notification requested1 linked violation
- September 30, 2014State Violation/Reminder Notice1 linked violation
- September 23, 2014State Compliance achieved1 linked violation
- August 4, 2014State Public Notification received1 linked violation
- July 9, 2014State Public Notification requested1 linked violation
- July 9, 2014State Violation/Reminder Notice1 linked violation
- February 6, 2014State Compliance achieved6 linked violations
- February 6, 2014State Compliance achieved6 linked violations
- January 24, 2014State Violation/Reminder Notice21 linked violations
- January 24, 2014State Violation/Reminder Notice26 linked violations
- January 24, 2014State Public Notification requested21 linked violations
- January 24, 2014State Public Notification requested6 linked violations
- January 24, 2014State Violation/Reminder Notice6 linked violations
- January 24, 2014State Public Notification requested6 linked violations
- January 24, 2014State Violation/Reminder Notice6 linked violations
- January 24, 2014State Public Notification requested26 linked violations
- January 24, 2014State Public Notification requested1 linked violation
- January 24, 2014State Violation/Reminder Notice1 linked violation
- January 15, 2014State Public Notification requested1 linked violation
- January 15, 2014State Violation/Reminder Notice1 linked violation
- January 15, 2014State Compliance achieved1 linked violation
- December 18, 2013State Compliance achieved1 linked violation
- December 18, 2013State Violation/Reminder Notice1 linked violation
- November 13, 2013State Compliance achieved1 linked violation
- November 13, 2013State Compliance achieved1 linked violation
- September 23, 2013State Compliance achieved47 linked violations
- August 12, 2013State Public Notification received1 linked violation
- July 18, 2013State Compliance achieved1 linked violation
- July 17, 2013State Public Notification requested1 linked violation
- July 17, 2013State Violation/Reminder Notice1 linked violation
- January 30, 2013State Compliance achieved1 linked violation
- January 30, 2013State Compliance achieved22 linked violations
- January 30, 2013State Compliance achieved1 linked violation
- January 11, 2013State Public Notification requested1 linked violation
- January 11, 2013State Violation/Reminder Notice1 linked violation
- September 4, 2012State Public Notification received1 linked violation
- August 20, 2012State Public Notification requested1 linked violation
- August 20, 2012State Violation/Reminder Notice1 linked violation
- May 25, 2012State Violation/Reminder Notice1 linked violation
- May 25, 2012State Public Notification requested1 linked violation
- March 1, 2012State Public Notification received1 linked violation
- February 22, 2012State Administrative Penalty assessed1 linked violation
- February 22, 2012State Formal Notice of Violation issued2 linked violations
- February 22, 2012State Administrative Penalty assessed8 linked violations
- February 14, 2012State Violation/Reminder Notice1 linked violation
- February 14, 2012State Public Notification requested1 linked violation
- January 31, 2012State Public Notification requested1 linked violation
- January 31, 2012State Violation/Reminder Notice1 linked violation
- January 31, 2012State Compliance achieved1 linked violation
- December 12, 2011State Administrative/Compliance Order without penalty issued8 linked violations
- December 12, 2011State Administrative/Compliance Order without penalty issued1 linked violation
- December 12, 2011State Administrative/Compliance Order without penalty issued2 linked violations
- November 23, 2011State Public Notification received1 linked violation
- October 26, 2011State Violation/Reminder Notice1 linked violation
- October 26, 2011State Public Notification requested1 linked violation
- August 11, 2011State Other4 linked violations
- August 11, 2011State Other1 linked violation
- August 9, 2011State Public Notification received1 linked violation
- July 26, 2011State Violation/Reminder Notice1 linked violation
- July 26, 2011State Public Notification requested1 linked violation
- July 26, 2011State Other3 linked violations
- May 4, 2011State Public Notification received1 linked violation
- April 19, 2011State Public Notification requested1 linked violation
- April 19, 2011State Violation/Reminder Notice1 linked violation
- September 15, 2010State Public Notification requested21 linked violations
- May 15, 2009State Compliance achieved1 linked violation
- May 15, 2009State Compliance achieved1 linked violation
- May 15, 2009State Compliance achieved1 linked violation
- May 15, 2009State Compliance achieved2 linked violations
- February 10, 2006State Violation/Reminder Notice1 linked violation
- February 10, 2006State Public Notification requested1 linked violation
- February 10, 2006State Public Notification requested1 linked violation
- July 5, 2002State Violation/Reminder Notice33 linked violations
- July 5, 2002State Violation/Reminder Notice34 linked violations
- July 5, 2002State Public Notification requested34 linked violations
- July 5, 2002State Public Notification requested34 linked violations
- May 15, 2001State Compliance achieved1 linked violation
- October 11, 2000State Compliance achieved21 linked violations
- June 19, 2000State Violation/Reminder Notice16 linked violations
- June 19, 2000State Public Notification requested7 linked violations
- September 27, 1999State Violation/Reminder Notice2 linked violations
Contact
EKNESS, JEFFREY
406-385-2445
WESTBY, MT 59275