Drinking Water Compliance OS

Colusa, 09

Colusa Northern System 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 EPA Region 9’s official records. Always confirm current status with EPA Region 9 before making decisions based on this information.

System facts

System ID (PWSID)
090605046
System type
Community Water System
Population served
67
Service connections
13
Ownership
Native American tribal
Water source
groundwater (wells)

Violation history

  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2005 – August 18, 2006

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2004 – August 18, 2006

    Resolved
  • Monitoring, Regular

    Endothall

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    ETHYLENE DIBROMIDE

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Glyphosate

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    CYANIDE

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Di(2-ethylhexyl) adipate

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    OXAMYL

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Simazine

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring and Reporting (DBP)

    TTHM

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Di(2-ethylhexyl) phthalate

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    1,2-DIBROMO-3-CHLOROPROPANE

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Picloram

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Diquat

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Xylenes, Total

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Toxaphene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Dalapon

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Dinoseb

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Endrin

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Hexachlorocyclopentadiene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    HEXACHLOROBENZENE

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Total Polychlorinated Biphenyls (PCB)

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Carbofuran

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    2,4,5-TP

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring and Reporting (DBP)

    Total Haloacetic Acids (HAA5)

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Atrazine

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    2,4-D

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    BHC-GAMMA

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    LASSO

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Pentachlorophenol

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    2,3,7,8-TCDD

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Heptachlor epoxide

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Chlordane

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Heptachlor

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Methoxychlor

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Benzo(a)pyrene

    January 1, 2004 – December 31, 2004

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2002 – August 18, 2006

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 2002 – December 31, 2002

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2001 – August 18, 2006

    Resolved
  • Monitoring, Regular

    Benzene

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Arsenic

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Barium

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Cadmium

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Chromium

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    CYANIDE

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Fluoride

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Mercury

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Selenium

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Antimony, Total

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Beryllium, Total

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Thallium, Total

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Endrin

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    BHC-GAMMA

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Methoxychlor

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Toxaphene

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Dalapon

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Diquat

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Endothall

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Glyphosate

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Di(2-ethylhexyl) adipate

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    OXAMYL

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Simazine

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Di(2-ethylhexyl) phthalate

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Picloram

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Dinoseb

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Hexachlorocyclopentadiene

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Carbofuran

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Atrazine

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    LASSO

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    2,3,7,8-TCDD

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Heptachlor

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Heptachlor epoxide

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    2,4-D

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    2,4,5-TP

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    HEXACHLOROBENZENE

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Benzo(a)pyrene

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Pentachlorophenol

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    1,2,4-Trichlorobenzene

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    cis-1,2-Dichloroethylene

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Total Polychlorinated Biphenyls (PCB)

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Xylenes, Total

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Chlordane

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    DICHLOROMETHANE

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    o-Dichlorobenzene

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    p-Dichlorobenzene

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Vinyl chloride

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    1,1-Dichloroethylene

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    trans-1,2-Dichloroethylene

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    1,2-Dichloroethane

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    1,1,1-Trichloroethane

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Carbon tetrachloride

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    1,2-Dichloropropane

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Trichloroethylene

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    1,1,2-Trichloroethane

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Tetrachloroethylene

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    CHLOROBENZENE

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Toluene

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Ethylbenzene

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Styrene

    January 1, 2001 – December 31, 2001

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2000 – August 18, 2006

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 1999 – December 31, 1999

    Resolved
  • Monitoring, Regular

    1,2-DIBROMO-3-CHLOROPROPANE

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    ETHYLENE DIBROMIDE

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    September 1, 1996 – September 30, 1996

    Resolved
  • Initial Tap Sampling for Pb and Cu

    Lead and Copper Rule

    July 1, 1996 – February 24, 2004

    Resolved
  • Monitoring, Regular

    o-Dichlorobenzene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Cadmium

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    p-Dichlorobenzene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Styrene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Vinyl chloride

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Barium

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    1,1-Dichloroethylene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    trans-1,2-Dichloroethylene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    1,2-Dichloroethane

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    1,1,1-Trichloroethane

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Carbon tetrachloride

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Nitrate-Nitrite

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    1,2-Dichloropropane

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Mercury

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Heptachlor epoxide

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Trichloroethylene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Heptachlor

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    2,4-D

    January 1, 1996 – December 31, 1996

    Resolved
  • Initial Tap Sampling for Pb and Cu

    Lead and Copper Rule

    January 1, 1996 – February 24, 2004

    Resolved
  • Monitoring, Regular

    LASSO

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    2,4,5-TP

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Atrazine

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Tetrachloroethylene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Carbofuran

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Selenium

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Toluene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Chlordane

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Chromium

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Ethylbenzene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Asbestos

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    ETHYLENE DIBROMIDE

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Xylenes, Total

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Toxaphene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Pentachlorophenol

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    CHLOROBENZENE

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Methoxychlor

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Fluoride

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    cis-1,2-Dichloroethylene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Benzene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Total Polychlorinated Biphenyls (PCB)

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Arsenic

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    BHC-GAMMA

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    1,2-DIBROMO-3-CHLOROPROPANE

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    September 1, 1992 – September 30, 1992

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    August 1, 1992 – August 31, 1992

    Resolved
  • Monitoring, Repeat Major (TCR)

    Coliform (TCR)

    December 1, 1991 – December 31, 1991

    Resolved

Resolved addressed and confirmed by the state

Enforcement actions

Contact

Cachil Dehe Band of Wintun Indians

5304588231

Colusa, CA 95932-4018