Drinking Water Compliance OS

DELAWARE, OK · Nowata County

DELAWARE Water System

Current status

6 items on record are open and awaiting resolution as of July 4, 2026. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings. Full details are in the violation history below.

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

System facts

System ID (PWSID)
OK1021502
System type
Community Water System
Population served
456
Service connections
358
Ownership
local government
Water source
surface water (rivers, lakes, or reservoirs)

Violation history

  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    April 1, 2025 – April 30, 2025

    Archived
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    May 1, 2024 – May 31, 2024

    Resolved
  • Treatment Technique Precursor Removal

    Health-based

    CARBON, TOTAL

    April 1, 2024 – June 30, 2024

    Archived
  • Public Notification Violation for NPDWR Violation

    Public Notice

    December 3, 2023

    Addressed
  • Public Notification Violation for NPDWR Violation

    Public Notice

    September 29, 2023

    Addressed
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    August 1, 2023 – August 31, 2023

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    June 5, 2023 – June 26, 2025

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    April 4, 2023 – June 26, 2025

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    March 1, 2023 – March 31, 2023

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    January 8, 2023 – June 26, 2025

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    November 1, 2022 – November 30, 2022

    Resolved
  • Consumer Confidence Report Inadequate Reporting

    Consumer Confidence Rule

    October 2, 2022 – July 31, 2024

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    October 1, 2022 – October 31, 2022

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    September 1, 2022 – September 30, 2022

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    August 24, 2022 – June 26, 2025

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    July 26, 2022 – June 26, 2025

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    June 25, 2022 – June 26, 2025

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    June 1, 2022 – June 30, 2022

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    April 27, 2022 – June 26, 2025

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    April 1, 2022 – April 30, 2022

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    March 1, 2022 – March 31, 2022

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    January 26, 2022 – June 26, 2025

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    December 1, 2021 – December 31, 2021

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    November 17, 2021

    Addressed
  • Public Notification Violation for NPDWR Violation

    Public Notice

    September 29, 2021

    Addressed
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    July 1, 2021 – July 31, 2021

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    June 28, 2021

    Addressed
  • Public Notification Violation for NPDWR Violation

    Public Notice

    June 28, 2021

    Addressed
  • Public Notification Violation for NPDWR Violation

    Public Notice

    March 17, 2021 – October 5, 2023

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    January 1, 2021 – January 31, 2021

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    December 1, 2020 – October 5, 2023

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    October 6, 2020 – October 5, 2023

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    August 1, 2020 – August 31, 2020

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    July 28, 2020 – October 5, 2023

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    June 10, 2020 – October 5, 2023

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    June 1, 2020 – June 30, 2020

    Resolved
  • Monitoring, Regular

    Nitrate-Nitrite

    January 1, 2020 – December 31, 2020

    Resolved
  • Treatment Technique Precursor Removal

    Health-based

    CARBON, TOTAL

    January 1, 2019 – March 31, 2019

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    January 1, 2019 – January 31, 2019

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    October 1, 2018 – October 31, 2018

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    September 1, 2018 – September 30, 2018

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    August 1, 2018 – August 31, 2018

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    July 1, 2018 – July 31, 2018

    Resolved
  • Treatment Technique Precursor Removal

    Health-based

    CARBON, TOTAL

    July 1, 2018 – September 30, 2018

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    April 1, 2018 – April 30, 2018

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    December 1, 2017 – December 31, 2017

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    November 1, 2017 – November 30, 2017

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2017 – July 31, 2024

    Resolved
  • Monitoring, Turbidity (Enhanced SWTR)

    Interim Enhanced Surface Water Treatment Rule

    May 1, 2017 – May 31, 2017

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2016 – March 6, 2017

    Resolved
  • Monitoring, Regular

    Nitrate-Nitrite

    January 1, 2016 – December 31, 2016

    Resolved
  • Monitoring, Regular

    Tetrachloroethylene

    January 1, 2014 – December 31, 2016

    Resolved
  • Monitoring, Regular

    Styrene

    January 1, 2014 – December 31, 2016

    Resolved
  • Monitoring, Regular

    Ethylbenzene

    January 1, 2014 – December 31, 2016

    Resolved
  • Monitoring, Regular

    Benzene

    January 1, 2014 – December 31, 2016

    Resolved
  • Monitoring, Regular

    Vinyl chloride

    January 1, 2014 – December 31, 2016

    Resolved
  • Monitoring, Regular

    p-Dichlorobenzene

    January 1, 2014 – December 31, 2016

    Resolved
  • Monitoring, Regular

    Xylenes, Total

    January 1, 2014 – December 31, 2016

    Resolved
  • Treatment Technique Precursor Removal

    Health-based

    CARBON, TOTAL

    July 1, 2012 – September 30, 2012

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2012 – September 30, 2012

    Resolved
  • Treatment Technique Precursor Removal

    Health-based

    CARBON, TOTAL

    January 1, 2012 – March 31, 2012

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    October 1, 2011 – December 31, 2011

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2011 – September 30, 2011

    Resolved
  • Treatment Technique Precursor Removal

    Health-based

    CARBON, TOTAL

    April 1, 2011 – June 30, 2011

    Resolved
  • Treatment Technique Precursor Removal

    Health-based

    CARBON, TOTAL

    October 1, 2010 – December 31, 2010

    Resolved
  • Treatment Technique Precursor Removal

    Health-based

    CARBON, TOTAL

    January 1, 2010 – March 31, 2010

    Resolved
  • Treatment Technique Precursor Removal

    Health-based

    CARBON, TOTAL

    January 1, 2009 – March 31, 2009

    Resolved
  • Treatment Technique Precursor Removal

    Health-based

    CARBON, TOTAL

    October 1, 2008 – December 31, 2008

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    October 1, 2008 – December 31, 2008

    Resolved
  • Treatment Technique Precursor Removal

    Health-based

    CARBON, TOTAL

    January 1, 2008 – March 31, 2008

    Resolved
  • Monitoring and Reporting (DBP)

    Total Haloacetic Acids (HAA5)

    October 1, 2007 – December 31, 2007

    Resolved
  • Monitoring and Reporting (DBP)

    TTHM

    October 1, 2007 – December 31, 2007

    Resolved
  • Treatment Technique Precursor Removal

    Health-based

    CARBON, TOTAL

    October 1, 2007 – December 31, 2007

    Resolved
  • Treatment Technique Precursor Removal

    Health-based

    CARBON, TOTAL

    October 1, 2006 – December 31, 2006

    Resolved
  • Treatment Technique Precursor Removal

    Health-based

    CARBON, TOTAL

    July 1, 2006 – September 30, 2006

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    April 1, 2005 – June 30, 2005

    Resolved
  • Monitoring and Reporting (DBP)

    CARBON, TOTAL

    January 1, 2004 – March 31, 2004

    Resolved
  • Monitoring, Routine Minor (TCR)

    Coliform (TCR)

    June 1, 1991 – June 30, 1991

    Resolved

Archived closed in EPA's records (typically due to age or a data correction)Resolved addressed and confirmed by the stateAddressed corrective action reported, pending final confirmation

Enforcement actions

Contact

DELAWARE

918-467-3218

DELAWARE, OK 74027