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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.

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Violations

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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 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	20230014414	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	20230014413	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	20220015742	Returned to Compliance	01-JAN-2022	31-DEC-2022	No
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	20210010743	Returned to Compliance	01-JUL-2021	-	No
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	20200009041	Returned to Compliance	01-JUL-2020	31-JUL-2020	No
MR	Failure to Conduct Assessment Monitoring	Ground Water Rule	E. COLI	20200009043	Returned to Compliance	01-JUL-2020	31-JUL-2020	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	20160001755	Returned to Compliance	01-JAN-2015	31-DEC-2015	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	20120005235	Known	01-JUL-2012	30-SEP-2012	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	20120005259	Known	01-JUL-2012	30-SEP-2012	No
MCL	Maximum Contaminant Level Violation, Single Sample	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	92V0001	Known	01-MAY-1992	30-APR-1996	Yes
MCL	Maximum Contaminant Level Violation, Single Sample	Inorganic Chemicals	Mercury	91V0012	Known	01-SEP-1991	31-AUG-1994	Yes

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Enforcement Actions

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Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
639948	20230014413	SOX	State Compliance achieved	29-SEP-2023	State	-
639948	20230014414	SOX	State Compliance achieved	29-SEP-2023	State	-
631815	20220015742	SOX	State Compliance achieved	04-JAN-2023	State	-
595950	20210010743	SOX	State Compliance achieved	27-DEC-2021	State	-
566071	20200009041	SOX	State Compliance achieved	25-AUG-2020	State	-
566071	20200009043	SOX	State Compliance achieved	25-AUG-2020	State	-
450627	20160001755	SOX	State Compliance achieved	22-JAN-2016	State	-
362789	20120005259	SIA	State Violation/Reminder Notice	14-JAN-2013	State	-
362789	20120005235	SIA	State Violation/Reminder Notice	14-JAN-2013	State	-
95E0001	92V0001	SIA	State Violation/Reminder Notice	31-JAN-1995	State	-
93E0001	91V0012	SIC	State Technical Assistance Visit	22-OCT-1992	State	-

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All Facilities

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Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
WTP1 WELL #1	1481214130	Yes	Well	Ground water	Permanent	Active
AIRPORT/WTP4 WELL #2	4359753642	Yes	Well	Ground water	Permanent	Active
AIRPORT WELL #1	4359753641	Yes	Well	Ground water	Permanent	Active
WELL 1	4359753640	Yes	Well	Ground water	Permanent	Active
WELL 1	4359753639	Yes	Well	Ground water	Permanent	Active
WELL 1	4359753638	Yes	Well	Ground water	Permanent	Active
WTP3 WELL #1	4359752384	Yes	Well	Ground water	Permanent	Active
WTP2 WELL #1	4359751225	Yes	Well	Ground water	Permanent	Active
WELL	4359747532	Yes	Well	Ground water	Permanent	Active
WELLS #1 #2	1481314130	Yes	Well	Ground water	Permanent	Active
WILLISTON WTP #1	127036382055	No	Treatment Plant	-	-	Active
WILLISTON WTP #2	250126382055	No	Treatment Plant	-	-	Active
WILLISTON WTP #3	400576382055	No	Treatment Plant	-	-	Active
WILLISTON WTP #4	478576382055	No	Treatment Plant	-	-	Active

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Treatment Processes

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Facility Name	Facility ID	Treatment Process	Treatment Objective
WILLISTON WTP #1	127036382055	Gaseous Chlorination, Post	Disinfection
WILLISTON WTP #1	127036382055	Hypochlorination, Post	Disinfection
WILLISTON WTP #2	250126382055	Gaseous Chlorination, Post	Disinfection
WILLISTON WTP #2	250126382055	Hypochlorination, Post	Disinfection
WILLISTON WTP #3	400576382055	Hypochlorination, Post	Disinfection
WILLISTON WTP #4	478576382055	Hypochlorination, Post	Disinfection

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