Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	OK1010809
PWS Name	DUNCAN PUBLIC UTILITIES AUTHORITY
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	No
Population Served	23000
County Served	Stephens

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	Chloramine	8006974	Known	01-NOV-2025	30-NOV-2025	No
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	8006959	Returned to Compliance	01-NOV-2024	30-NOV-2024	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chloramine	8006958	Returned to Compliance	01-NOV-2024	30-NOV-2024	No
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	8006963	Known	01-OCT-2024	31-DEC-2024	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	8006955	Returned to Compliance	01-AUG-2024	31-AUG-2024	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	8006954	Returned to Compliance	01-AUG-2024	31-AUG-2024	No
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	8006964	Known	01-JUL-2024	30-SEP-2024	Yes
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	8006949	Known	01-APR-2024	30-JUN-2024	Yes
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	8006945	Known	01-JAN-2024	31-MAR-2024	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006932	Known	01-JAN-2023	31-MAR-2023	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006917	Known	01-APR-2020	30-JUN-2020	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006913	Known	01-JAN-2020	31-MAR-2020	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006912	Known	01-JAN-2020	31-MAR-2020	Yes
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	8006915	Returned to Compliance	01-JAN-2020	31-MAR-2020	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006914	Known	01-JAN-2020	31-MAR-2020	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006907	Returned to Compliance	01-OCT-2019	31-DEC-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006906	Known	01-OCT-2019	31-DEC-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006908	Known	01-OCT-2019	31-DEC-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006909	Known	01-OCT-2019	31-DEC-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006901	Returned to Compliance	01-JUL-2019	30-SEP-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006904	Returned to Compliance	01-JUL-2019	30-SEP-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006902	Returned to Compliance	01-JUL-2019	30-SEP-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006903	Returned to Compliance	01-JUL-2019	30-SEP-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006899	Known	01-APR-2019	30-JUN-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006897	Returned to Compliance	01-APR-2019	30-JUN-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006900	Known	01-APR-2019	30-JUN-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006898	Known	01-APR-2019	30-JUN-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006896	Known	01-JAN-2019	31-MAR-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006894	Known	01-JAN-2019	31-MAR-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006893	Returned to Compliance	01-JAN-2019	31-MAR-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006895	Known	01-JAN-2019	31-MAR-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006888	Known	01-OCT-2018	31-DEC-2018	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006884	Known	01-JUL-2018	30-SEP-2018	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006878	Returned to Compliance	01-APR-2018	30-JUN-2018	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006873	Returned to Compliance	01-JAN-2018	31-MAR-2018	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006869	Returned to Compliance	01-OCT-2017	31-DEC-2017	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chloramine	8006867	Returned to Compliance	01-OCT-2017	31-DEC-2017	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	8006861	Returned to Compliance	01-JUL-2017	30-SEP-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006862	Returned to Compliance	01-JUL-2017	30-SEP-2017	Yes
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	8006859	Returned to Compliance	01-FEB-2017	30-APR-2017	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006858	Returned to Compliance	01-FEB-2017	30-APR-2017	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006844	Known	01-JAN-2017	31-MAR-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	8006841	Known	01-JAN-2017	31-MAR-2017	Yes
TT	Single Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	8006827	Returned to Compliance	01-DEC-2016	31-DEC-2016	Yes
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006856	Returned to Compliance	01-NOV-2016	31-JAN-2017	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	8006857	Returned to Compliance	01-NOV-2016	31-JAN-2017	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	8006829	Known	01-OCT-2016	31-DEC-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006833	Known	01-OCT-2016	31-DEC-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	8006821	Returned to Compliance	01-JUL-2016	30-SEP-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	8006817	Known	01-JUL-2016	30-SEP-2016	Yes

1 - 50 of 166

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
9199591	8006954	SIF	State Public Notification received	17-JUN-2025	State	-
9199591	8006955	SIF	State Public Notification received	17-JUN-2025	State	-
9199592	8006958	SIF	State Public Notification received	17-JUN-2025	State	-
9199592	8006959	SIF	State Public Notification received	17-JUN-2025	State	-
9199590	8006963	SIF	State Public Notification received	28-MAY-2025	State	-
9199590	8006964	SIF	State Public Notification received	28-MAY-2025	State	-
9199587	8006945	SFO	State Administrative/Compliance Order with penalty issued	15-APR-2025	State	Stage 2 DBP TTHM MCL, Construction & Operational violations.
9199587	8006949	SFO	State Administrative/Compliance Order with penalty issued	15-APR-2025	State	Stage 2 DBP TTHM MCL, Construction & Operational violations.
9199560	8006932	SIF	State Public Notification received	04-MAY-2023	State	-
9199557	8006743	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006915	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006773	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006780	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006809	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006813	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006821	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006825	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006861	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006862	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006869	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006873	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006878	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006893	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006897	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006901	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006902	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006903	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006904	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006907	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199557	8006762	SOX	State Compliance achieved	08-FEB-2021	State	Stage 2 TTHM & HAA5 MCL & TOC TT; closed due to all requirements being fulfilled.
9199556	8006917	SIF	State Public Notification received	06-OCT-2020	State	-
9199553	8006912	SIF	State Public Notification received	06-JUL-2020	State	-
9199553	8006914	SIF	State Public Notification received	06-JUL-2020	State	-
9199553	8006913	SIF	State Public Notification received	06-JUL-2020	State	-
9199550	8006906	SIF	State Public Notification received	06-MAY-2020	State	-
9199550	8006909	SIF	State Public Notification received	06-MAY-2020	State	-
9199550	8006908	SIF	State Public Notification received	06-MAY-2020	State	-
9199549	8006867	SIF	State Public Notification received	28-OCT-2019	State	Distributed with CCR
9199543	8006899	SIF	State Public Notification received	16-SEP-2019	State	-
9199543	8006898	SIF	State Public Notification received	16-SEP-2019	State	-
9199543	8006900	SIF	State Public Notification received	16-SEP-2019	State	-
9199539	8006895	SIF	State Public Notification received	27-JUN-2019	State	-
9199539	8006894	SIF	State Public Notification received	27-JUN-2019	State	-
9199540	8006888	SIF	State Public Notification received	27-JUN-2019	State	-
9199539	8006896	SIF	State Public Notification received	27-JUN-2019	State	-
9199532	8006884	SIF	State Public Notification received	22-JAN-2019	State	-
9199514	8006859	SIF	State Public Notification received	11-OCT-2017	State	-
9199514	8006858	SIF	State Public Notification received	11-OCT-2017	State	-
9199515	8006857	SIF	State Public Notification received	11-OCT-2017	State	-
9199515	8006856	SIF	State Public Notification received	11-OCT-2017	State	-

1 - 50 of 163

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
WAURIKA LAKE	15661	Yes	Intake	Surface water	Permanent	Active
LAKE HUMPHRIES	15663	Yes	Intake	Surface water	Permanent	Active
LAKE FUQUA	15662	Yes	Intake	Surface water	Permanent	Active
DISTRIBUTION SYSTEM	17206	No	Distribution System/Zone	-	-	Active
EL RANCHO	29948	No	Pump Facility	-	-	Active
INDUSTRY PARK	29949	No	Pump Facility	-	-	Active
FUQUA RAW WATER PUMP STATION	30669	No	Pump Facility	-	-	Active
HUMPHRIES RAW WATER PUMP STATION	30670	No	Pump Facility	-	-	Active
POE01 - WTP	22279	No	Sampling Station	-	-	Active
TOC RAW	23072	No	Sampling Station	-	-	Active
COMBINEB RAW SAMPLE POINT	30187	No	Sampling Station	-	-	Active
N. INDUSTRIAL W. STORAGE TANK	27886	No	Storage	-	-	Active
N. INDUSTRIAL E. STORAGE TANK	27887	No	Storage	-	-	Active
EL RANCHO STORAGE TOWER	27888	No	Storage	-	-	Active
27TH AND MAIN STORAGE TANK	27889	No	Storage	-	-	Active
ELK AND 10TH STORAGE TANK 1	27890	No	Storage	-	-	Active
NW WATER TOWER	27891	No	Storage	-	-	Active
ELK ADN 10TH STORAGE TANK 2	29945	No	Storage	-	-	Active
ELK ADN 10TH STORAGE TANK 3	29947	No	Storage	-	-	Active
DUNCAN WTP	10833	No	Treatment Plant	-	-	Active

1 - 20 of 20

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
DUNCAN WTP	10833	Gaseous Chlorination, Post	Disinfection
DUNCAN WTP	10833	Coagulation	Particulate removal
DUNCAN WTP	10833	Gaseous Chlorination, Pre	Disinfection
DUNCAN WTP	10833	Chloramines	Disinfection by-products control
DUNCAN WTP	10833	Sedimentation	Particulate removal
DUNCAN WTP	10833	Innovative	Other
DUNCAN WTP	10833	Filtration, Rapid Sand	Particulate removal
DUNCAN WTP	10833	pH Adjustment	Corrosion control
DUNCAN WTP	10833	Lime - Soda Ash Addition	Softening (hardness removal)

1 - 9 of 9

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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