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PWS ID	OK1010803
PWS Name	CHEYENNE
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	No
Population Served	778
County Served	Roger Mills

The tables below list all violations that the state reported to EPA for this water system. Health-based violations are listed first, followed by treatment technique, MRDL, monitoring, reporting, and other violations.

Health-based	Violations of maximum contaminant levels (MCLs) or maximum residual disinfectant levels (MRDLs), which specify the highest concentrations of contaminants or disinfectants, respectively, allowed in drinking water; or of treatment technique (TT) rules, which specify required processes intended to reduce the amounts of contaminants in drinking water. MCLs, MRDLs, and treatment technique rules are all health-based drinking water standards.
Maximum Contaminant Level or MCL	The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
Treatment Technique	A required process intended to reduce the level of a contaminant in drinking water.
Maximum residual disinfectant level or MRDL	The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.
Monitoring & reporting	Failure to conduct regular monitoring of drinking water quality, as required by SDWA, or to submit monitoring results in a timely fashion to the primacy agency or EPA.
Public notification & other	Failure to provide notification to the public as required by the Violations of Public Notification Rule and the Consumer Confidence Report Rule, and violations of other requirements such as those violations related to variances and exemptions.

Violations

Violation Category Code	Violation Type Description	Rule Name	Contaminant Name	Violation ID	Compliance Status Description	Compliance Period Begin Date	Compliance Period End Date	Is Health Based Ind
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	279809	Known	01-NOV-2025	30-NOV-2025	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	279811	Known	01-NOV-2025	30-NOV-2025	No
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	279813	Known	01-NOV-2025	30-NOV-2025	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	279812	Known	01-NOV-2025	30-NOV-2025	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279805	Known	01-JUL-2025	30-SEP-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279800	Known	01-APR-2025	30-JUN-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279791	Known	01-JAN-2025	31-MAR-2025	Yes
MR	Failure Submit IDSE/Subpart V Plan Rpt	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279788	Returned to Compliance	30-DEC-2024	-	No
RPT	LSL Reporting	Lead and Copper Rule Revisions	LEAD AND COPPER RULE REVISIONS	279797	Returned to Compliance	17-OCT-2024	-	No
TT	LSL Inventory	Lead and Copper Rule Revisions	LEAD AND COPPER RULE REVISIONS	279796	Returned to Compliance	17-OCT-2024	-	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279786	Known	01-OCT-2024	31-DEC-2024	Yes
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	279773	Returned to Compliance	01-FEB-2024	29-FEB-2024	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	279772	Returned to Compliance	01-JAN-2024	31-MAR-2024	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	279771	Returned to Compliance	01-JAN-2024	31-MAR-2024	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	279769	Returned to Compliance	01-JAN-2024	31-MAR-2024	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	279750	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	279751	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	279746	Returned to Compliance	01-MAY-2023	31-MAY-2023	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	279753	Returned to Compliance	01-MAY-2023	31-JUL-2023	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279752	Returned to Compliance	01-MAY-2023	31-JUL-2023	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279726	Returned to Compliance	01-JUL-2020	30-SEP-2020	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279724	Returned to Compliance	01-APR-2020	30-JUN-2020	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279705	Returned to Compliance	01-JAN-2020	31-MAR-2020	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279704	Returned to Compliance	01-OCT-2019	31-DEC-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279702	Returned to Compliance	01-JUL-2019	30-SEP-2019	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	279701	Known	01-JUL-2019	30-SEP-2019	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	279700	Known	01-JUL-2019	30-SEP-2019	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279697	Returned to Compliance	01-APR-2019	30-JUN-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279696	Returned to Compliance	01-APR-2019	30-JUN-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279693	Returned to Compliance	01-JAN-2019	31-MAR-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279689	Returned to Compliance	01-OCT-2018	31-DEC-2018	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	279687	Returned to Compliance	01-OCT-2018	31-OCT-2018	Yes
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	279686	Returned to Compliance	01-OCT-2018	31-OCT-2018	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279685	Returned to Compliance	01-JUL-2018	30-SEP-2018	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279684	Returned to Compliance	01-APR-2018	30-JUN-2018	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279683	Returned to Compliance	01-JAN-2018	31-MAR-2018	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279679	Returned to Compliance	01-OCT-2017	31-DEC-2017	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	279673	Returned to Compliance	01-JUL-2017	30-SEP-2017	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279671	Returned to Compliance	01-JUL-2017	30-SEP-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279665	Returned to Compliance	01-APR-2017	30-JUN-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279660	Returned to Compliance	01-JAN-2017	31-MAR-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279658	Returned to Compliance	01-OCT-2016	31-DEC-2016	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	279663	Returned to Compliance	01-OCT-2016	31-DEC-2016	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279648	Returned to Compliance	01-JUL-2016	30-SEP-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279646	Returned to Compliance	01-APR-2016	30-JUN-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279644	Returned to Compliance	01-JAN-2016	31-MAR-2016	Yes
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	279628	Returned to Compliance	01-DEC-2015	31-DEC-2015	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279629	Returned to Compliance	01-OCT-2015	31-DEC-2015	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	279624	Returned to Compliance	01-JUL-2015	30-SEP-2015	Yes
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	279621	Returned to Compliance	01-JUL-2015	31-JUL-2015	Yes

1 - 50 of 106

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
9004190	279805	SFL	State Administrative/Compliance Order without penalty issued	12-NOV-2025	State	3Q2025 TTHM MCL
9004186	279796	SOX	State Compliance achieved	07-OCT-2025	State	-
9004187	279797	SOX	State Compliance achieved	07-OCT-2025	State	-
9004185	279800	SFL	State Administrative/Compliance Order without penalty issued	07-AUG-2025	State	2Q2025 TTHM MCL
9004178	279570	SO0	State no longer subject to Rule	18-JUN-2025	State	SO6 was applied to violation as instructed by EPA. Due to database issues, SO6 did not function. New action added to fix issues. ERH
9004177	279567	SO0	State no longer subject to Rule	18-JUN-2025	State	SO6 was applied to violation as instructed by EPA. Due to database issues, SO6 did not function. New action added to fix issues. ERH
9004176	279566	SO0	State no longer subject to Rule	18-JUN-2025	State	SO6 was applied to violation as instructed by EPA. Due to database issues, SO6 did not function. New action added to fix issues. ERH
9004179	279571	SO0	State no longer subject to Rule	18-JUN-2025	State	SO6 was applied to violation as instructed by EPA. Due to database issues, SO6 did not function. New action added to fix issues. ERH
9004174	279788	SOX	State Compliance achieved	30-APR-2025	State	-
9004173	279791	SIF	State Public Notification received	07-APR-2025	State	-
9004167	279786	SIF	State Public Notification received	23-JAN-2025	State	-
9004163	279769	SOX	State Compliance achieved	30-MAY-2024	State	-
9004162	279773	SOX	State Compliance achieved	30-MAY-2024	State	-
9004161	279772	SOX	State Compliance achieved	30-MAY-2024	State	-
9004160	279771	SOX	State Compliance achieved	30-MAY-2024	State	-
9004142	279750	SOX	State Compliance achieved	20-FEB-2024	State	-
9004140	279753	SOX	State Compliance achieved	20-FEB-2024	State	-
9004140	279752	SOX	State Compliance achieved	20-FEB-2024	State	-
9004143	279751	SOX	State Compliance achieved	20-FEB-2024	State	-
9004138	279746	SIF	State Public Notification received	26-SEP-2023	State	-
9004122	279679	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279683	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279684	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279685	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279689	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279693	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279696	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279697	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279671	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279665	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279660	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279658	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279648	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279646	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279644	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279629	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279624	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279619	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279614	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279599	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279702	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279705	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279724	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279726	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279704	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004122	279586	SOX	State Compliance achieved	22-DEC-2021	State	Stage 2 TTHM MCL, HAA5 MCL, TOC TT; closed due to all requirements fulfilled.
9004118	279700	SIF	State Public Notification received	25-SEP-2020	State	-
9004120	279701	SIF	State Public Notification received	25-SEP-2020	State	-
9004087	279686	SOX	State Compliance achieved	30-SEP-2019	State	Turbidity and Chlorine October 2018; closed due to system achieving compliance.
9004087	279687	SOX	State Compliance achieved	30-SEP-2019	State	Turbidity and Chlorine October 2018; closed due to system achieving compliance.

1 - 50 of 99

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
LAKE THOMAS	15656	Yes	Intake	Surface water	Permanent	Active
DISTRIBUTION SYSTEM	17202	No	Distribution System/Zone	-	-	Active
PUMP STATION	22681	No	Pump Facility	-	-	Inactive
POE01 - WTP	22280	No	Sampling Station	-	-	Active
TOC RAW	23068	No	Sampling Station	-	-	Active
STANDPIPE	26102	No	Storage	-	-	Active
CHEYENNE WTP	10829	No	Treatment Plant	-	-	Active

1 - 7 of 7

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
CHEYENNE WTP	10829	Gaseous Chlorination, Post	Disinfection
CHEYENNE WTP	10829	Coagulation	Particulate removal
CHEYENNE WTP	10829	Permanganate	Organics removal
CHEYENNE WTP	10829	Peroxide	Organics removal
CHEYENNE WTP	10829	Sedimentation	Particulate removal
CHEYENNE WTP	10829	Filtration, Rapid Sand	Particulate removal
CHEYENNE WTP	10829	pH Adjustment	Corrosion control

1 - 7 of 7

For more information on a Water System:
Ask the operators of your water system, contact your primacy agency or file a Freedom of Information Act (FOIA) request.
Drinking water in general: Find out more about your drinking water web site or call the Safe Drinking Water Hotline (1-800-426-4791). EPA has also prepared a table about various regulated drinking water contaminants.
Tools for accessing EPA drinking water data: Safe Drinking Water Information System (SDWIS) Federal Reporting Services and Drinking Water Performance and Results Report.
Research Data: As well as monitoring the levels of drinking water contaminants for which EPA has set standards, EPA, states, and water systems also carry out studies of contaminants that may need to be regulated in the future. For more information about these contaminants, please see the National Contaminant Occurrence Database.

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