Drinking Water Compliance OS

Santa Ysabel, 09

Mesa Grande (Tract 2) 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)
090605011
System type
Community Water System
Population served
43
Service connections
15
Ownership
Native American tribal
Water source
groundwater (wells)

Violation history

  • Monitoring, Regular

    Nitrate

    January 1, 2024 – December 31, 2024

    Archived
  • Monitoring, Regular

    Nitrate

    January 1, 2023 – December 31, 2023

    Archived
  • Monitoring, Regular

    Endrin

    July 1, 2020 – September 30, 2020

    Resolved
  • Monitoring, Regular

    Toxaphene

    July 1, 2020 – September 30, 2020

    Resolved
  • Monitoring, Regular

    Total Polychlorinated Biphenyls (PCB)

    July 1, 2020 – September 30, 2020

    Resolved
  • Monitoring, Regular

    Methoxychlor

    July 1, 2020 – September 30, 2020

    Resolved
  • Monitoring, Regular

    Chlordane

    July 1, 2020 – September 30, 2020

    Resolved
  • Monitoring, Regular

    Heptachlor

    July 1, 2020 – September 30, 2020

    Resolved
  • Monitoring, Regular

    Heptachlor epoxide

    July 1, 2020 – September 30, 2020

    Resolved
  • Monitoring, Regular

    HEXACHLOROBENZENE

    July 1, 2020 – September 30, 2020

    Resolved
  • Monitoring, Regular

    Hexachlorocyclopentadiene

    July 1, 2020 – September 30, 2020

    Resolved
  • Monitoring, Regular

    BHC-GAMMA

    July 1, 2020 – September 30, 2020

    Resolved
  • Sample Siting Plan Errors (RTCR)

    Revised Total Coliform Rule

    April 1, 2016 – August 11, 2017

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 2016 – December 31, 2016

    Resolved
  • Failure Submit IDSE/Subpart V Plan Rpt

    Stage 2 Disinfectants and Disinfection Byproducts Rule

    October 1, 2013 – August 11, 2017

    Resolved
  • Monitoring, Routine Minor (TCR)

    Coliform (TCR)

    December 1, 2009 – December 31, 2009

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 2009 – December 31, 2009

    Resolved
  • Monitoring, Routine Minor (TCR)

    Coliform (TCR)

    August 1, 2007 – August 31, 2007

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2006 – August 15, 2007

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 2006 – December 31, 2006

    Resolved
  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    August 1, 2005 – August 31, 2005

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2005 – August 15, 2007

    Resolved
  • Monitoring, Routine Minor (TCR)

    Coliform (TCR)

    April 1, 2005 – April 30, 2005

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 2005 – December 31, 2005

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2004 – August 15, 2007

    Resolved
  • Monitoring, Regular

    1,2-DIBROMO-3-CHLOROPROPANE

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    1,1,1-Trichloroethane

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    ETHYLENE DIBROMIDE

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    1,2-Dichloroethane

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Xylenes, Total

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    trans-1,2-Dichloroethylene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Endrin

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Chlordane

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    DICHLOROMETHANE

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    1,1-Dichloroethylene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    o-Dichlorobenzene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Vinyl chloride

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    p-Dichlorobenzene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    BHC-GAMMA

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Methoxychlor

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Fluoride

    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

    Diquat

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Mercury

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Endothall

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Glyphosate

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Cadmium

    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, Regular

    Di(2-ethylhexyl) phthalate

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Picloram

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Dinoseb

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Heptachlor

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Benzene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Heptachlor epoxide

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    CHLOROBENZENE

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Arsenic

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    2,4-D

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Tetrachloroethylene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Selenium

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    2,4,5-TP

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Antimony, Total

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    HEXACHLOROBENZENE

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Chromium

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Benzo(a)pyrene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    1,1,2-Trichloroethane

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Beryllium, Total

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Pentachlorophenol

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Barium

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    1,2,4-Trichlorobenzene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Trichloroethylene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Thallium, Total

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    cis-1,2-Dichloroethylene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    1,2-Dichloropropane

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Total Polychlorinated Biphenyls (PCB)

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Carbon tetrachloride

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    CYANIDE

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Gross Alpha, Excl. Radon and U

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Carbofuran

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Styrene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Atrazine

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Ethylbenzene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    LASSO

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    2,3,7,8-TCDD

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Toluene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Hexachlorocyclopentadiene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 2003 – December 31, 2003

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    September 1, 2002 – September 30, 2002

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2002 – August 15, 2007

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    January 1, 2002 – January 31, 2002

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 2002 – December 31, 2002

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    November 1, 2001 – November 30, 2001

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2001 – August 15, 2007

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 2000 – December 31, 2000

    Resolved
  • Monitoring, Regular

    Methoxychlor

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Arsenic

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Barium

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Cadmium

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Chromium

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    CYANIDE

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Fluoride

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Mercury

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Nitrite

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Selenium

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Beryllium, Total

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Thallium, Total

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Asbestos

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Endrin

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    BHC-GAMMA

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Toxaphene

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Dalapon

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Diquat

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Endothall

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Glyphosate

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Di(2-ethylhexyl) adipate

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    OXAMYL

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Simazine

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Di(2-ethylhexyl) phthalate

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Picloram

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Dinoseb

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Hexachlorocyclopentadiene

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Carbofuran

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Atrazine

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    LASSO

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    2,3,7,8-TCDD

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Heptachlor

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Heptachlor epoxide

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    2,4-D

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    2,4,5-TP

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    HEXACHLOROBENZENE

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Benzo(a)pyrene

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Pentachlorophenol

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    1,2,4-Trichlorobenzene

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    cis-1,2-Dichloroethylene

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Total Polychlorinated Biphenyls (PCB)

    January 1, 1998 – December 31, 1998

    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, Regular

    Xylenes, Total

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Chlordane

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    DICHLOROMETHANE

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    o-Dichlorobenzene

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    p-Dichlorobenzene

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Vinyl chloride

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    1,1-Dichloroethylene

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    trans-1,2-Dichloroethylene

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    1,2-Dichloroethane

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    1,1,1-Trichloroethane

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Carbon tetrachloride

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    1,2-Dichloropropane

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Trichloroethylene

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    1,1,2-Trichloroethane

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Tetrachloroethylene

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    CHLOROBENZENE

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Benzene

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Toluene

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Ethylbenzene

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Styrene

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Regular

    Gross Alpha, Excl. Radon and U

    January 1, 1998 – December 31, 1998

    Resolved
  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    August 1, 1996 – August 31, 1996

    Resolved
  • Monitoring, Regular

    1,2-DIBROMO-3-CHLOROPROPANE

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    1,2-Dichloropropane

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Asbestos

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Total Polychlorinated Biphenyls (PCB)

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Trichloroethylene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Selenium

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    cis-1,2-Dichloroethylene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Pentachlorophenol

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Tetrachloroethylene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Nitrite

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    2,4,5-TP

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    CHLOROBENZENE

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    2,4-D

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Benzene

    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

    Toluene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Fluoride

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Heptachlor

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Ethylbenzene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Chromium

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    LASSO

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Styrene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Cadmium

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Atrazine

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Gross Alpha, Excl. Radon and U

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Barium

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Carbofuran

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Vinyl chloride

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Carbon tetrachloride

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Endrin

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    p-Dichlorobenzene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    1,1-Dichloroethylene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Toxaphene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    o-Dichlorobenzene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    trans-1,2-Dichloroethylene

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Arsenic

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Chlordane

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    1,2-Dichloroethane

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Methoxychlor

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Xylenes, Total

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    1,1,1-Trichloroethane

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    BHC-GAMMA

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    ETHYLENE DIBROMIDE

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Repeat Major (TCR)

    Coliform (TCR)

    April 1, 1991 – April 30, 1991

    Resolved

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

Enforcement actions

Contact

Mesa Grande Band of Mission Indians

7606196107

Santa Ysabel, CA 92070