Drinking Water Compliance OS

Mattawa, WA · Grant County

Mattawa City 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 Washington’s official records. Always confirm current status with Washington before making decisions based on this information.

System facts

System ID (PWSID)
WA5352000
System type
Community Water System
Population served
5,370
Service connections
1,026
Ownership
local government
Water source
groundwater (wells)

Violation history

  • Maximum Contaminant Level Violation, E. coli (RTCR)

    Health-based

    Revised Total Coliform Rule

    June 1, 2024 – June 30, 2024

    Resolved

  • Consumer Confidence Report Complete Failure to Report

    —

    Consumer Confidence Rule

    July 1, 2023 – September 20, 2023

    Resolved

  • Monitoring, Regular

    —

    Ethylbenzene

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    Toluene

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    Benzene

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    CHLOROBENZENE

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    Tetrachloroethylene

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    1,1,2-Trichloroethane

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    Trichloroethylene

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    1,2-Dichloropropane

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    Carbon tetrachloride

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    1,1,1-Trichloroethane

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    1,2-Dichloroethane

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    trans-1,2-Dichloroethylene

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    1,1-Dichloroethylene

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    Vinyl chloride

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    p-Dichlorobenzene

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    o-Dichlorobenzene

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    DICHLOROMETHANE

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    cis-1,2-Dichloroethylene

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    1,2,4-Trichlorobenzene

    January 1, 2014 – December 31, 2019

    Archived

  • Monitoring, Regular

    —

    Thallium, Total

    January 1, 2014 – December 31, 2016

    Resolved

  • Monitoring, Regular

    —

    Beryllium, Total

    January 1, 2014 – December 31, 2016

    Resolved

  • Monitoring, Regular

    —

    Antimony, Total

    January 1, 2014 – December 31, 2016

    Resolved

  • Monitoring, Regular

    —

    Selenium

    January 1, 2014 – December 31, 2016

    Resolved

  • Monitoring, Regular

    —

    Nitrite

    January 1, 2014 – December 31, 2016

    Resolved

  • Monitoring, Regular

    —

    Nickel

    January 1, 2014 – December 31, 2016

    Resolved

  • Monitoring, Regular

    —

    Mercury

    January 1, 2014 – December 31, 2016

    Resolved

  • Monitoring, Regular

    —

    Fluoride

    January 1, 2014 – December 31, 2016

    Resolved

  • Monitoring, Regular

    —

    CYANIDE

    January 1, 2014 – December 31, 2016

    Resolved

  • Monitoring, Regular

    —

    Chromium

    January 1, 2014 – December 31, 2016

    Resolved

  • Monitoring, Regular

    —

    Cadmium

    January 1, 2014 – December 31, 2016

    Resolved

  • Monitoring, Regular

    —

    Barium

    January 1, 2014 – December 31, 2016

    Resolved

  • Monitoring, Regular

    —

    Nitrate

    January 1, 2014 – December 31, 2014

    Resolved

  • Monitoring, Regular

    —

    Arsenic

    January 1, 2014 – December 31, 2016

    Resolved

  • Monitoring, Regular

    —

    Styrene

    January 1, 2014 – December 31, 2019

    Archived

  • Consumer Confidence Report Complete Failure to Report

    —

    Consumer Confidence Rule

    July 1, 2011 – November 3, 2011

    Resolved

  • Follow-up Or Routine LCR Tap M/R

    —

    Lead and Copper Rule

    January 1, 2011 – September 3, 2014

    Resolved

  • Monitoring, Regular

    —

    Nitrate

    January 1, 2011 – December 31, 2011

    Resolved

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) adipate

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Arsenic

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Barium

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Cadmium

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Chromium

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    CYANIDE

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Fluoride

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Mercury

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Nickel

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Selenium

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Antimony, Total

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Beryllium, Total

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Thallium, Total

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Dalapon

    January 1, 2008 – December 31, 2010

    Archived

  • Monitoring, Regular

    —

    Picloram

    January 1, 2008 – December 31, 2010

    Archived

  • Monitoring, Regular

    —

    Dinoseb

    January 1, 2008 – December 31, 2010

    Archived

  • Monitoring, Regular

    —

    2,4,5-TP

    January 1, 2008 – December 31, 2010

    Archived

  • Monitoring, Regular

    —

    Pentachlorophenol

    January 1, 2008 – December 31, 2010

    Archived

  • Monitoring, Regular

    —

    Arsenic

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Barium

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Cadmium

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Chromium

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    CYANIDE

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Fluoride

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Mercury

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Nickel

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Selenium

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Antimony, Total

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Beryllium, Total

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Thallium, Total

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Endrin

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    BHC-GAMMA

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Methoxychlor

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Toxaphene

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Simazine

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) phthalate

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Hexachlorocyclopentadiene

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Atrazine

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    LASSO

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Heptachlor

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Heptachlor epoxide

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    HEXACHLOROBENZENE

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Benzo(a)pyrene

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Pentachlorophenol

    January 1, 2008 – December 31, 2010

    Archived

  • Monitoring, Regular

    —

    Chlordane

    January 1, 2008 – December 31, 2010

    Resolved

  • Monitoring, Regular

    —

    Nitrate

    January 1, 2007 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Antimony, Total

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Selenium

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Nickel

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Mercury

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Fluoride

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Arsenic

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    CYANIDE

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Chromium

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Cadmium

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Barium

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Beryllium, Total

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Thallium, Total

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Vinyl chloride

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    p-Dichlorobenzene

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    o-Dichlorobenzene

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    DICHLOROMETHANE

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    cis-1,2-Dichloroethylene

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,2,4-Trichlorobenzene

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Ethylbenzene

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Styrene

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Toluene

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Benzene

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    CHLOROBENZENE

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Tetrachloroethylene

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,1,2-Trichloroethane

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Trichloroethylene

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,2-Dichloropropane

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Carbon tetrachloride

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,1,1-Trichloroethane

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,2-Dichloroethane

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    trans-1,2-Dichloroethylene

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,1-Dichloroethylene

    October 1, 2004 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    ETHYLENE DIBROMIDE

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Aldicarb sulfoxide

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Selenium

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Nickel

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Mercury

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Fluoride

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    CYANIDE

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Chromium

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Cadmium

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Antimony, Total

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Beryllium, Total

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Thallium, Total

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Endrin

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    BHC-GAMMA

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Methoxychlor

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Toxaphene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) adipate

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Simazine

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) phthalate

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Hexachlorocyclopentadiene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Atrazine

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    LASSO

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Heptachlor

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Heptachlor epoxide

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    HEXACHLOROBENZENE

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Benzo(a)pyrene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Pentachlorophenol

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Chlordane

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Arsenic

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Aldicarb

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Carbofuran

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Aldicarb sulfone

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    OXAMYL

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Pentachlorophenol

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    2,4,5-TP

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Dinoseb

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Picloram

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Dalapon

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,2-DIBROMO-3-CHLOROPROPANE

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Barium

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Routine Major (TCR)

    —

    Coliform (TCR)

    April 1, 1999 – April 30, 1999

    Archived

  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    June 1, 1997 – June 30, 1997

    Archived

  • Monitoring, Routine Major (TCR)

    —

    Coliform (TCR)

    December 1, 1996 – December 31, 1996

    Archived

  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    October 1, 1996 – October 31, 1996

    Archived

  • Monitoring, Routine Major (TCR)

    —

    Coliform (TCR)

    September 1, 1996 – September 30, 1996

    Archived

  • Monitoring, Routine Major (TCR)

    —

    Coliform (TCR)

    April 1, 1996 – April 30, 1996

    Archived

  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    June 1, 1995 – June 30, 1995

    Archived

  • Monitoring, Repeat Major (TCR)

    —

    Coliform (TCR)

    June 1, 1995 – June 30, 1995

    Archived

  • Monitoring, Routine Major (TCR)

    —

    Coliform (TCR)

    October 19, 1994 – November 18, 1994

    Archived

  • Monitoring, Routine Major (TCR)

    —

    Coliform (TCR)

    March 1, 1994 – March 31, 1994

    Archived

  • Monitoring, Regular

    —

    Gross Alpha, Excl. Radon and U

    October 1, 1979 – October 31, 1979

    Archived

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

Enforcement actions

Contact

Mattawa City of

Phone not on record

Mattawa, WA 99349