Walla Walla, WA · Walla Walla County

WALLA WALLA WATER DIVISION 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): WA5392500
System type: Community Water System
Population served: 42,959
Service connections: 15,281
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

Violation history

Monitoring, Regular
—
Nitrate
January 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Picloram
October 1, 2022 – December 31, 2022
Resolved
Monitoring, Regular
—
Dinoseb
October 1, 2022 – December 31, 2022
Resolved
Monitoring, Regular
—
2,4,5-TP
October 1, 2022 – December 31, 2022
Resolved
Monitoring, Regular
—
Pentachlorophenol
October 1, 2022 – December 31, 2022
Resolved
Monitoring, Regular
—
Dalapon
October 1, 2022 – December 31, 2022
Resolved
Monitoring, Regular
—
Dinoseb
July 1, 2022 – September 30, 2022
Resolved
Monitoring, Regular
—
Dalapon
July 1, 2022 – September 30, 2022
Resolved
Monitoring, Regular
—
Pentachlorophenol
July 1, 2022 – September 30, 2022
Resolved
Monitoring, Regular
—
2,4,5-TP
July 1, 2022 – September 30, 2022
Resolved
Monitoring, Regular
—
Picloram
July 1, 2022 – September 30, 2022
Resolved
Monitoring, Regular
—
Dalapon
April 1, 2021 – June 30, 2021
Resolved
Monitoring, Regular
—
Pentachlorophenol
April 1, 2021 – June 30, 2021
Resolved
Monitoring, Regular
—
2,4,5-TP
April 1, 2021 – June 30, 2021
Resolved
Monitoring, Regular
—
Dinoseb
April 1, 2021 – June 30, 2021
Resolved
Monitoring, Regular
—
Picloram
April 1, 2021 – June 30, 2021
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
January 1, 2021 – March 31, 2021
Resolved
Monitoring and Reporting (DBP)
—
TTHM
January 1, 2021 – March 31, 2021
Resolved
Failure to Filter (SWTR)
Health-based
Long Term 2 Enhanced Surface Water Treatment Rule
December 1, 2018 – May 19, 2020
Resolved
Failure to Filter (SWTR)
Health-based
Long Term 2 Enhanced Surface Water Treatment Rule
November 1, 2018 – May 19, 2020
Resolved
Failure to Filter (SWTR)
Health-based
Long Term 2 Enhanced Surface Water Treatment Rule
October 1, 2018 – May 19, 2020
Resolved
Failure to Filter (SWTR)
Health-based
Long Term 2 Enhanced Surface Water Treatment Rule
September 1, 2018 – May 19, 2020
Resolved
Failure to Filter (SWTR)
Health-based
Long Term 2 Enhanced Surface Water Treatment Rule
August 1, 2018 – May 19, 2020
Resolved
Failure to Filter (SWTR)
Health-based
Long Term 2 Enhanced Surface Water Treatment Rule
July 1, 2018 – May 19, 2020
Resolved
Failure to Filter (SWTR)
Health-based
Long Term 2 Enhanced Surface Water Treatment Rule
June 1, 2018 – May 19, 2020
Resolved
Failure to Filter (SWTR)
Health-based
Long Term 2 Enhanced Surface Water Treatment Rule
May 1, 2018 – May 19, 2020
Resolved
Failure to Filter (SWTR)
Health-based
Long Term 2 Enhanced Surface Water Treatment Rule
April 1, 2018 – May 19, 2020
Resolved
Failure to Filter (SWTR)
Health-based
Long Term 2 Enhanced Surface Water Treatment Rule
March 1, 2018 – May 19, 2020
Resolved
Failure to Filter (SWTR)
Health-based
Long Term 2 Enhanced Surface Water Treatment Rule
February 1, 2018 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
December 1, 2017 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
April 1, 2017 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
March 1, 2017 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
February 1, 2017 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
January 1, 2017 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
December 1, 2016 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
November 1, 2016 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
October 1, 2016 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
September 1, 2016 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
August 1, 2016 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
July 1, 2016 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
June 1, 2016 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
May 1, 2016 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
April 1, 2016 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
March 1, 2016 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
February 1, 2016 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
January 1, 2016 – May 19, 2020
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
December 1, 2015 – May 19, 2020
Resolved
Monitoring, Regular
—
Thallium, Total
January 1, 2011 – December 31, 2019
Resolved
Monitoring, Regular
—
Arsenic
January 1, 2011 – December 31, 2019
Resolved
Monitoring, Regular
—
Barium
January 1, 2011 – December 31, 2019
Resolved
Monitoring, Regular
—
Cadmium
January 1, 2011 – December 31, 2019
Resolved
Monitoring, Regular
—
Chromium
January 1, 2011 – December 31, 2019
Resolved
Monitoring, Regular
—
CYANIDE
January 1, 2011 – December 31, 2019
Resolved
Monitoring, Regular
—
Fluoride
January 1, 2011 – December 31, 2019
Resolved
Monitoring, Regular
—
Mercury
January 1, 2011 – December 31, 2019
Resolved
Monitoring, Regular
—
Nickel
January 1, 2011 – December 31, 2019
Resolved
Monitoring, Regular
—
Nitrite
January 1, 2011 – December 31, 2019
Resolved
Monitoring, Regular
—
Selenium
January 1, 2011 – December 31, 2019
Resolved
Monitoring, Regular
—
Antimony, Total
January 1, 2011 – December 31, 2019
Resolved
Monitoring, Regular
—
Beryllium, Total
January 1, 2011 – December 31, 2019
Resolved
Monitoring, Regular
—
Aldicarb
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Carbofuran
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Aldicarb sulfone
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Aldicarb sulfoxide
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
OXAMYL
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Diquat
January 1, 2005 – December 31, 2007
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
November 1, 1995 – November 30, 1995
Archived
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 1995 – January 1, 1998
Resolved
Initial Tap Sampling for Pb and Cu
—
Lead and Copper Rule
July 1, 1992 – January 1, 1993
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
October 1, 1991 – October 31, 1991
Archived
Monitoring, Regular
—
Chromium
October 1, 1979 – October 31, 1979
Archived
Monitoring, Regular
—
Fluoride
October 1, 1979 – October 31, 1979
Archived
Monitoring, Regular
—
Mercury
October 1, 1979 – October 31, 1979
Archived
Monitoring, Regular
—
Nitrate
October 1, 1979 – October 31, 1979
Archived
Monitoring, Regular
—
Selenium
October 1, 1979 – October 31, 1979
Archived
Monitoring, Regular
—
Arsenic
October 1, 1979 – October 31, 1979
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 1, 1979 – October 31, 1979
Archived
Monitoring, Regular
—
Barium
October 1, 1979 – October 31, 1979
Archived
Monitoring, Regular
—
Cadmium
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)

Period	Violation	Contaminant / rule	Health-based	Status
January 1, 2023 – December 31, 2023	Monitoring, Regular	Nitrate	—	Resolved
October 1, 2022 – December 31, 2022	Monitoring, Regular	Picloram	—	Resolved
October 1, 2022 – December 31, 2022	Monitoring, Regular	Dinoseb	—	Resolved
October 1, 2022 – December 31, 2022	Monitoring, Regular	2,4,5-TP	—	Resolved
October 1, 2022 – December 31, 2022	Monitoring, Regular	Pentachlorophenol	—	Resolved
October 1, 2022 – December 31, 2022	Monitoring, Regular	Dalapon	—	Resolved
July 1, 2022 – September 30, 2022	Monitoring, Regular	Dinoseb	—	Resolved
July 1, 2022 – September 30, 2022	Monitoring, Regular	Dalapon	—	Resolved
July 1, 2022 – September 30, 2022	Monitoring, Regular	Pentachlorophenol	—	Resolved
July 1, 2022 – September 30, 2022	Monitoring, Regular	2,4,5-TP	—	Resolved
July 1, 2022 – September 30, 2022	Monitoring, Regular	Picloram	—	Resolved
April 1, 2021 – June 30, 2021	Monitoring, Regular	Dalapon	—	Resolved
April 1, 2021 – June 30, 2021	Monitoring, Regular	Pentachlorophenol	—	Resolved
April 1, 2021 – June 30, 2021	Monitoring, Regular	2,4,5-TP	—	Resolved
April 1, 2021 – June 30, 2021	Monitoring, Regular	Dinoseb	—	Resolved
April 1, 2021 – June 30, 2021	Monitoring, Regular	Picloram	—	Resolved
January 1, 2021 – March 31, 2021	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
January 1, 2021 – March 31, 2021	Monitoring and Reporting (DBP)	TTHM	—	Resolved
December 1, 2018 – May 19, 2020	Failure to Filter (SWTR)	Long Term 2 Enhanced Surface Water Treatment Rule	Health-based	Resolved
November 1, 2018 – May 19, 2020	Failure to Filter (SWTR)	Long Term 2 Enhanced Surface Water Treatment Rule	Health-based	Resolved
October 1, 2018 – May 19, 2020	Failure to Filter (SWTR)	Long Term 2 Enhanced Surface Water Treatment Rule	Health-based	Resolved
September 1, 2018 – May 19, 2020	Failure to Filter (SWTR)	Long Term 2 Enhanced Surface Water Treatment Rule	Health-based	Resolved
August 1, 2018 – May 19, 2020	Failure to Filter (SWTR)	Long Term 2 Enhanced Surface Water Treatment Rule	Health-based	Resolved
July 1, 2018 – May 19, 2020	Failure to Filter (SWTR)	Long Term 2 Enhanced Surface Water Treatment Rule	Health-based	Resolved
June 1, 2018 – May 19, 2020	Failure to Filter (SWTR)	Long Term 2 Enhanced Surface Water Treatment Rule	Health-based	Resolved
May 1, 2018 – May 19, 2020	Failure to Filter (SWTR)	Long Term 2 Enhanced Surface Water Treatment Rule	Health-based	Resolved
April 1, 2018 – May 19, 2020	Failure to Filter (SWTR)	Long Term 2 Enhanced Surface Water Treatment Rule	Health-based	Resolved
March 1, 2018 – May 19, 2020	Failure to Filter (SWTR)	Long Term 2 Enhanced Surface Water Treatment Rule	Health-based	Resolved
February 1, 2018 – May 19, 2020	Failure to Filter (SWTR)	Long Term 2 Enhanced Surface Water Treatment Rule	Health-based	Resolved
December 1, 2017 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
April 1, 2017 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
March 1, 2017 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
February 1, 2017 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
January 1, 2017 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
December 1, 2016 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
November 1, 2016 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
October 1, 2016 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
September 1, 2016 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
August 1, 2016 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
July 1, 2016 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
June 1, 2016 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
May 1, 2016 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
April 1, 2016 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
March 1, 2016 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
February 1, 2016 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
January 1, 2016 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
December 1, 2015 – May 19, 2020	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
January 1, 2011 – December 31, 2019	Monitoring, Regular	Thallium, Total	—	Resolved
January 1, 2011 – December 31, 2019	Monitoring, Regular	Arsenic	—	Resolved
January 1, 2011 – December 31, 2019	Monitoring, Regular	Barium	—	Resolved
January 1, 2011 – December 31, 2019	Monitoring, Regular	Cadmium	—	Resolved
January 1, 2011 – December 31, 2019	Monitoring, Regular	Chromium	—	Resolved
January 1, 2011 – December 31, 2019	Monitoring, Regular	CYANIDE	—	Resolved
January 1, 2011 – December 31, 2019	Monitoring, Regular	Fluoride	—	Resolved
January 1, 2011 – December 31, 2019	Monitoring, Regular	Mercury	—	Resolved
January 1, 2011 – December 31, 2019	Monitoring, Regular	Nickel	—	Resolved
January 1, 2011 – December 31, 2019	Monitoring, Regular	Nitrite	—	Resolved
January 1, 2011 – December 31, 2019	Monitoring, Regular	Selenium	—	Resolved
January 1, 2011 – December 31, 2019	Monitoring, Regular	Antimony, Total	—	Resolved
January 1, 2011 – December 31, 2019	Monitoring, Regular	Beryllium, Total	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	Aldicarb	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Carbofuran	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Aldicarb sulfone	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Aldicarb sulfoxide	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	OXAMYL	—	Archived
January 1, 2005 – December 31, 2007	Monitoring, Regular	Diquat	—	Resolved
November 1, 1995 – November 30, 1995	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
January 1, 1995 – January 1, 1998	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
July 1, 1992 – January 1, 1993	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	—	Resolved
October 1, 1991 – October 31, 1991	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Archived
October 1, 1979 – October 31, 1979	Monitoring, Regular	Chromium	—	Archived
October 1, 1979 – October 31, 1979	Monitoring, Regular	Fluoride	—	Archived
October 1, 1979 – October 31, 1979	Monitoring, Regular	Mercury	—	Archived
October 1, 1979 – October 31, 1979	Monitoring, Regular	Nitrate	—	Archived
October 1, 1979 – October 31, 1979	Monitoring, Regular	Selenium	—	Archived
October 1, 1979 – October 31, 1979	Monitoring, Regular	Arsenic	—	Archived
October 1, 1979 – October 31, 1979	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived
October 1, 1979 – October 31, 1979	Monitoring, Regular	Barium	—	Archived
October 1, 1979 – October 31, 1979	Monitoring, Regular	Cadmium	—	Archived

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

Enforcement actions

July 8, 2025State Compliance achieved1 linked violation
November 25, 2024State Compliance achieved10 linked violations
February 16, 2022State Compliance achieved13 linked violations
August 24, 2021State Compliance achieved5 linked violations
May 25, 2021State Compliance achieved1 linked violation
May 25, 2021State Compliance achieved1 linked violation
May 19, 2020State Administrative/Compliance Order without penalty issued39 linked violations
May 19, 2020State Compliance achieved12 linked violations
May 19, 2020State Compliance achieved27 linked violations
January 1, 2008State Compliance achieved1 linked violation
January 1, 2008State Compliance achieved55 linked violations
January 1, 1998State Compliance achieved2 linked violations
January 1, 1993State Compliance achieved1 linked violation
May 31, 1992State Violation/Reminder Notice1 linked violation

Contact

WALLA WALLA WATER DIVISION

Phone not on record

Walla Walla, WA 99362