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PWS ID	OK1021691
PWS Name	GRAND LAKE PWA
PWS Type	Community water system
Owner Type	Local government
Primary Source	Ground water
Primacy Type	State
Is Wholesaler?	No
Population Served	2800
County Served	Delaware

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
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	259580	Known	01-JUL-2025	30-SEP-2025	Yes
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	259578	Returned to Compliance	01-OCT-2024	-	No
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	259577	Returned to Compliance	01-JAN-2024	31-MAR-2024	Yes
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	259576	Returned to Compliance	02-OCT-2023	-	No
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	259575	Known	01-OCT-2023	31-DEC-2023	Yes
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	259567	Returned to Compliance	01-APR-2022	30-JUN-2022	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Uranium	259568	Returned to Compliance	01-APR-2022	30-JUN-2022	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	259569	Returned to Compliance	01-APR-2022	30-JUN-2022	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Beta Particle Activity	259570	Returned to Compliance	01-APR-2022	30-JUN-2022	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	259563	Returned to Compliance	01-JAN-2022	31-MAR-2022	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	259565	Returned to Compliance	01-JAN-2022	31-MAR-2022	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Beta Particle Activity	259566	Returned to Compliance	01-JAN-2022	31-MAR-2022	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Uranium	259564	Returned to Compliance	01-JAN-2022	31-MAR-2022	No
MR	Monitoring, Source Water (GWR)	Ground Water Rule	E. COLI	259559	Returned to Compliance	20-OCT-2020	-	No
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	259556	Returned to Compliance	01-OCT-2018	31-OCT-2018	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	259555	Returned to Compliance	01-OCT-2018	31-DEC-2018	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	259552	Returned to Compliance	01-JUL-2017	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	259519	Returned to Compliance	01-JUL-2016	-	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	259509	Returned to Compliance	01-JAN-2015	31-AUG-2015	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	259510	Returned to Compliance	01-JAN-2015	31-AUG-2015	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	259507	Returned to Compliance	01-JUL-2014	-	No
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	259479	Returned to Compliance	01-JAN-2014	31-MAR-2014	Yes
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	259474	Returned to Compliance	01-OCT-2013	31-DEC-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	259471	Returned to Compliance	01-JUL-2013	30-SEP-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	259470	Returned to Compliance	01-JUL-2013	30-SEP-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	259466	Returned to Compliance	01-APR-2013	30-JUN-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	259465	Returned to Compliance	01-APR-2013	30-JUN-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	259464	Returned to Compliance	01-JAN-2013	31-MAR-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	259463	Returned to Compliance	01-JAN-2013	31-MAR-2013	Yes
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	259462	Returned to Compliance	01-OCT-2012	31-DEC-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	259460	Returned to Compliance	01-OCT-2012	31-DEC-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	259459	Returned to Compliance	01-OCT-2012	31-DEC-2012	Yes
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	259461	Returned to Compliance	01-JUL-2012	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	259456	Returned to Compliance	01-JUL-2012	30-SEP-2012	Yes
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	259458	Returned to Compliance	01-JUL-2012	30-SEP-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	259457	Returned to Compliance	01-JUL-2012	30-SEP-2012	Yes
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	259454	Returned to Compliance	01-APR-2012	30-JUN-2012	Yes
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	259450	Returned to Compliance	01-OCT-2010	31-OCT-2010	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	259445	Returned to Compliance	01-OCT-2009	31-DEC-2009	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	259451	Returned to Compliance	01-JUL-2009	-	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	259443	Returned to Compliance	01-APR-2009	30-JUN-2009	No
MR	Monitoring, Routine (IDSE)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	259473	Returned to Compliance	01-FEB-2009	30-APR-2009	No
MR	Monitoring, Routine (IDSE)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	259472	Returned to Compliance	01-FEB-2009	30-APR-2009	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	259441	Returned to Compliance	01-JAN-2009	31-MAR-2009	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	259444	Returned to Compliance	01-JAN-2009	31-MAR-2009	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	259417	Returned to Compliance	01-OCT-2008	31-DEC-2008	Yes
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	259415	Returned to Compliance	01-SEP-2008	30-SEP-2008	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	259449	Returned to Compliance	01-JUL-2008	-	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	259440	Returned to Compliance	01-JAN-2008	31-MAR-2008	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	259412	Returned to Compliance	01-SEP-2007	30-SEP-2007	No

1 - 50 of 98

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
9006838	259580	SFL	State Administrative/Compliance Order without penalty issued	18-NOV-2025	State	3Q2025 Combined Rad MCL
9006835	259577	SOX	State Compliance achieved	30-JUL-2025	State	Combined Radium MCL./Closed, system achieved compliance.
9006834	259578	SOX	State Compliance achieved	11-JUL-2025	State	-
9006828	259565	SIF	State Public Notification received	30-APR-2024	State	-
9006827	259569	SIF	State Public Notification received	30-APR-2024	State	-
9006828	259563	SIF	State Public Notification received	30-APR-2024	State	-
9006828	259564	SIF	State Public Notification received	30-APR-2024	State	-
9006827	259570	SIF	State Public Notification received	30-APR-2024	State	-
9006828	259566	SIF	State Public Notification received	30-APR-2024	State	-
9006827	259567	SIF	State Public Notification received	30-APR-2024	State	-
9006827	259568	SIF	State Public Notification received	30-APR-2024	State	-
9006825	259576	SIA	State Violation/Reminder Notice	18-JAN-2024	State	-
9006824	259575	SIE	State Public Notification requested	04-JAN-2024	State	-
9006821	259559	SOX	State Compliance achieved	08-DEC-2022	State	-
9006812	259556	SIF	State Public Notification received	15-OCT-2019	State	Distributed with CCR
9006811	259555	SIF	State Public Notification received	15-OCT-2019	State	Distributed with CCR
9006802	259510	SIF	State Public Notification received	19-SEP-2018	State	-
9006802	259509	SIF	State Public Notification received	19-SEP-2018	State	-
9006799	259552	SIA	State Violation/Reminder Notice	17-NOV-2017	State	-
9006798	259519	SOX	State Compliance achieved	06-MAR-2017	State	CCR RTC
9006789	86597	SOX	State Compliance achieved	26-JUL-2016	State	AUTOMATIC RETURN TO COMPLIANCE 7/26/2016 - Violations Should be Closed Out because PWS is in complaince.
9006787	241194	SOX	State Compliance achieved	26-JUL-2016	State	AUTOMATIC RETURN TO COMPLIANCE 7/26/2016 - Violations Should be Closed Out because PWS is in complaince.
9006785	42093	SOX	State Compliance achieved	26-JUL-2016	State	AUTOMATIC RETURN TO COMPLIANCE 7/26/2016 - Violations Should be Closed Out because PWS is in complaince.
9006786	48193	SOX	State Compliance achieved	26-JUL-2016	State	AUTOMATIC RETURN TO COMPLIANCE 7/26/2016 - Violations Should be Closed Out because PWS is in complaince.
9006788	254594	SOX	State Compliance achieved	26-JUL-2016	State	AUTOMATIC RETURN TO COMPLIANCE 7/26/2016 - Violations Should be Closed Out because PWS is in complaince.
9006791	125200	SOX	State Compliance achieved	26-JUL-2016	State	AUTOMATIC RETURN TO COMPLIANCE 7/26/2016 - Violations Should be Closed Out because PWS is in complaince.
9006792	125300	SOX	State Compliance achieved	26-JUL-2016	State	AUTOMATIC RETURN TO COMPLIANCE 7/26/2016 - Violations Should be Closed Out because PWS is in complaince.
9006790	128299	SOX	State Compliance achieved	26-JUL-2016	State	AUTOMATIC RETURN TO COMPLIANCE 7/26/2016 - Violations Should be Closed Out because PWS is in complaince.
9006776	259507	SOX	State Compliance achieved	21-MAR-2016	State	CCR RTC
9006776	259461	SOX	State Compliance achieved	21-MAR-2016	State	CCR RTC
9006759	259454	SOX	State Compliance achieved	11-FEB-2015	State	PWS have return to compliance and close out letter has been sent.
9006760	259456	SOX	State Compliance achieved	11-FEB-2015	State	PWS have return to compliance and close out letter has been sent.
9006760	259457	SOX	State Compliance achieved	11-FEB-2015	State	PWS have return to compliance and close out letter has been sent.
9006760	259458	SOX	State Compliance achieved	11-FEB-2015	State	PWS have return to compliance and close out letter has been sent.
9006761	259459	SOX	State Compliance achieved	11-FEB-2015	State	PWS have return to compliance and close out letter has been sent.
9006761	259460	SOX	State Compliance achieved	11-FEB-2015	State	PWS have return to compliance and close out letter has been sent.
9006764	259474	SOX	State Compliance achieved	11-FEB-2015	State	PWS have return to compliance and close out letter has been sent.
9006762	259463	SOX	State Compliance achieved	11-FEB-2015	State	PWS have return to compliance and close out letter has been sent.
9006762	259464	SOX	State Compliance achieved	11-FEB-2015	State	PWS have return to compliance and close out letter has been sent.
9006763	259465	SOX	State Compliance achieved	11-FEB-2015	State	PWS have return to compliance and close out letter has been sent.
9006763	259466	SOX	State Compliance achieved	11-FEB-2015	State	PWS have return to compliance and close out letter has been sent.
9006764	259470	SOX	State Compliance achieved	11-FEB-2015	State	PWS have return to compliance and close out letter has been sent.
9006764	259471	SOX	State Compliance achieved	11-FEB-2015	State	PWS have return to compliance and close out letter has been sent.
9006761	259462	SOX	State Compliance achieved	11-FEB-2015	State	PWS have return to compliance and close out letter has been sent.
9006757	259479	SO0	State no longer subject to Rule	13-OCT-2014	State	PWS is no longer surface water system as of 9/25/2014. ERH
#F9006752	259473	SOX	State Compliance achieved	08-MAY-2014	ODSWeb	Entered by EPA Region 6 to address ODS incorrect Validation Error ERR00043 - Y5000 was rejected because the water system does not have a Violation matching the Y5000 ID.
#F9006753	259472	SOX	State Compliance achieved	08-MAY-2014	ODSWeb	Entered by EPA Region 6 to address ODS incorrect Validation Error ERR00043 - Y5000 was rejected because the water system does not have a Violation matching the Y5000 ID.
11	259447	SOX	State Compliance achieved	27-FEB-2012	State	CCR Violations
11	259451	SOX	State Compliance achieved	27-FEB-2012	State	CCR Violations
11	259449	SOX	State Compliance achieved	27-FEB-2012	State	CCR Violations

1 - 50 of 95

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
GRAND LAKE	15945	Yes	Intake	Surface water	Permanent	Inactive
WELL 6	30831	Yes	Well	Ground water	Permanent	Active
WELL 5	28262	Yes	Well	Ground water	Permanent	Active
WELL 4	28261	Yes	Well	Ground water	Permanent	Active
WELL 3	28260	Yes	Well	Ground water	Permanent	Active
WELL 2	28259	Yes	Well	Ground water	Permanent	Active
WELL 1	28258	Yes	Well	Ground water	Permanent	Active
DISTRIBUTION SYSTEM	17366	No	Distribution System/Zone	-	-	Active
POE01 - WTP	22583	No	Sampling Station	-	-	Inactive
TOC RAW	23238	No	Sampling Station	-	-	Inactive
GROUND STORAGE BY TREATMENT PLANT	21990	No	Storage	-	-	Active
ELEVATED STORAGE TANK NEAR TP	21991	No	Storage	-	-	Active
STAND PIPE AT PORT DUNCAN	21992	No	Storage	-	-	Active
NORTH STANDPIPE	26451	No	Storage	-	-	Active
TP FOR WELLS	28263	No	Treatment Plant	-	-	Active
GRAND LAKE PWA WTP	11054	No	Treatment Plant	-	-	Inactive

1 - 16 of 16

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
GRAND LAKE PWA WTP	11054	Coagulation	Particulate removal
GRAND LAKE PWA WTP	11054	Hypochlorination, Post	Disinfection
GRAND LAKE PWA WTP	11054	Filtration, Rapid Sand	Particulate removal
GRAND LAKE PWA WTP	11054	pH Adjustment	Corrosion control
TP FOR WELLS	28263	Aeration, Diffused	Organics removal
TP FOR WELLS	28263	Activated Carbon, Granular	Inorganics removal
TP FOR WELLS	28263	Gaseous Chlorination, Post	Disinfection
TP FOR WELLS	28263	Filtration, Pressure Sand	Particulate removal

1 - 8 of 8

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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