Drinking Water Compliance OS

CROW AGENCY, 08

WYOLA WATER 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 8’s official records. Always confirm current status with EPA Region 8 before making decisions based on this information.

System facts

System ID (PWSID)
083090014
System type
Community Water System
Population served
281
Service connections
64
Ownership
Native American tribal
Water source
groundwater (wells)

Violation history

  • Follow-up Or Routine LCR Tap M/R

    Lead and Copper Rule

    January 1, 2025 – October 16, 2025

    Resolved
  • Monitoring, Regular

    1,1,2-Trichloroethane

    January 1, 2024 – December 31, 2024

    Resolved
  • Monitoring, Regular

    Trichloroethylene

    January 1, 2024 – December 31, 2024

    Resolved
  • Monitoring, Regular

    Carbon tetrachloride

    January 1, 2024 – December 31, 2024

    Resolved
  • Monitoring, Regular

    1,1,1-Trichloroethane

    January 1, 2024 – December 31, 2024

    Resolved
  • Monitoring, Regular

    p-Dichlorobenzene

    January 1, 2024 – December 31, 2024

    Resolved
  • Monitoring, Regular

    p-Dichlorobenzene

    January 1, 2023 – December 31, 2023

    Resolved
  • Monitoring, Regular

    cis-1,2-Dichloroethylene

    January 1, 2023 – December 31, 2023

    Resolved
  • Monitoring, Regular

    Xylenes, Total

    January 1, 2023 – December 31, 2023

    Resolved
  • Monitoring, Regular

    Pentachlorophenol

    July 1, 2021 – September 30, 2021

    Resolved
  • Monitoring, Regular

    Nitrate-Nitrite

    July 1, 2020 – September 30, 2020

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    April 1, 2020 – April 30, 2020

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    March 1, 2019 – March 31, 2019

    Resolved
  • Failure To Address Deficiency

    Health-based

    Groundwater Rule

    November 2, 2018 – November 16, 2019

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    February 1, 2018 – February 28, 2018

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    October 1, 2017 – October 31, 2017

    Resolved
  • Monitoring, Regular

    ETHYLENE DIBROMIDE

    January 1, 2008 – December 31, 2010

    Resolved
  • Monitoring, Regular

    Benzo(a)pyrene

    January 1, 2008 – December 31, 2010

    Resolved
  • Monitoring, Regular

    LASSO

    January 1, 2008 – December 31, 2010

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    March 1, 2000 – March 31, 2000

    Archived

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

Enforcement actions

Contact

STOPS, JR., MARVIN (WES)

406-697-4765

CROW AGENCY, MT 59022