Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	MT0000235
PWS Name	HARDIN CITY OF
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	No
Population Served	3500
County Served	Big Horn

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 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	4458819	Returned to Compliance	01-APR-2025	30-JUN-2025	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	4458818	Returned to Compliance	01-APR-2025	30-JUN-2025	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	4458817	Returned to Compliance	01-SEP-2020	31-AUG-2021	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	4458816	Returned to Compliance	01-SEP-2020	31-AUG-2021	No
MR	Lead Consumer Notice	Lead and Copper Rule	Lead and Copper Rule	4458815	Returned to Compliance	01-JAN-2014	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	4458814	Returned to Compliance	01-JUL-2013	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	4458813	Returned to Compliance	01-JUL-2012	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	4458811	Returned to Compliance	01-JUL-2010	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	4457407	Returned to Compliance	01-JUL-2006	-	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	4455405	Returned to Compliance	01-JUL-2004	30-SEP-2004	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	4455205	Returned to Compliance	01-JUL-2004	30-SEP-2004	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	4455305	Returned to Compliance	01-JUL-2004	30-SEP-2004	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	4455105	Returned to Compliance	01-JUL-2004	30-SEP-2004	No
MR	Monitoring, Regular	Inorganic Chemicals	Asbestos	4457305	Known	01-JAN-2002	31-DEC-2010	No
MR	Monitoring, Regular	Arsenic Rule	Arsenic	4452102	Returned to Compliance	01-JAN-2000	31-DEC-2000	No
MR	Monitoring, Repeat Minor (TCR)	Total Coliform Rule	Coliform (TCR)	210897	Returned to Compliance	01-DEC-1996	31-DEC-1996	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	4451696	Returned to Compliance	01-JAN-1996	31-JAN-1996	No
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	750895	Returned to Compliance	01-APR-1995	30-APR-1995	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	540395	Returned to Compliance	01-FEB-1995	28-FEB-1995	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	260295	Returned to Compliance	01-DEC-1994	31-DEC-1994	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	506095	Returned to Compliance	01-OCT-1994	31-OCT-1994	Yes
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	643294	Returned to Compliance	01-AUG-1994	31-AUG-1994	No
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	388995	Returned to Compliance	01-MAY-1994	31-MAY-1994	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	364595	Returned to Compliance	01-APR-1994	30-APR-1994	Yes
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	421694	Returned to Compliance	01-MAR-1994	31-MAR-1994	No
MR	Monitoring, Regular	Inorganic Chemicals	CYANIDE	1560296	Returned to Compliance	01-JAN-1994	31-DEC-1994	No

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Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
117135	4458819	SIF	State Public Notification received	05-NOV-2025	State	Received PN 8/26/2025-PMT
117135	4458818	SIF	State Public Notification received	05-NOV-2025	State	Received PN 8/26/2025-PMT
117131	4458816	SOX	State Compliance achieved	28-OCT-2021	State	-
117131	4458817	SOX	State Compliance achieved	28-OCT-2021	State	-
117122	4458815	SOX	State Compliance achieved	27-JAN-2014	State	-
117119	4458814	SOX	State Compliance achieved	18-JUL-2013	State	7/18/2013. recieved 2012 CCR and Cert form. L.G.S.
117116	4458813	SOX	State Compliance achieved	20-AUG-2012	State	-
117112	4458811	SIA	State Violation/Reminder Notice	07-AUG-2010	State	-
116609	421694	SOX	State Compliance achieved	06-JAN-2009	State	6 months no MCL or MR violations. LRA 1/6/2009
116609	643294	SOX	State Compliance achieved	06-JAN-2009	State	6 months no MCL or MR violations. LRA 1/6/2009
116609	210897	SOX	State Compliance achieved	06-JAN-2009	State	6 months no MCL or MR violations. LRA 1/6/2009
116609	4451696	SOX	State Compliance achieved	06-JAN-2009	State	6 months no MCL or MR violations. LRA 1/6/2009
116409	1560296	SOX	State Compliance achieved	31-DEC-2008	State	-
116709	4457407	SO+	State no additional Formal Action needed	07-NOV-2008	State	-
115307	4455305	SOX	State Compliance achieved	06-NOV-2006	State	-
115407	4455205	SOX	State Compliance achieved	06-NOV-2006	State	-
115507	4455105	SOX	State Compliance achieved	06-NOV-2006	State	-
115607	4455405	SOX	State Compliance achieved	06-NOV-2006	State	-
113503	4452102	SOX	State Compliance achieved	02-DEC-2002	State	-
116596	750895	SOX	State Compliance achieved	01-JUN-1996	State	Returned to Compliance. JW
116596	540395	SOX	State Compliance achieved	01-JUN-1996	State	Returned to Compliance. JW
116596	506095	SOX	State Compliance achieved	01-JUN-1996	State	Returned to Compliance. JW
116596	388995	SOX	State Compliance achieved	01-JUN-1996	State	Returned to Compliance. JW
116596	364595	SOX	State Compliance achieved	01-JUN-1996	State	Returned to Compliance. JW
116596	260295	SOX	State Compliance achieved	01-JUN-1996	State	Returned to Compliance. JW

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All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
INTAKE BIG HORN RIVER - SOUTH	19263	Yes	Intake	Surface water	Permanent	Active
INTAKE BIG HORN RIVER - NORTH	10522	Yes	Intake	Surface water	Permanent	Inactive
CLEARWELL CONTACT BASIN	13855	No	Clear Well	-	-	Active
DISTRIBUTION SYSTEM	11184	No	Distribution System/Zone	-	-	Active
PRESSURE CONTROL RURAL CONNECTIONS	13854	No	Pressure Control	-	-	Active
PUMP FACILITY RURAL CONNECTIONS	19265	No	Pump Facility	-	-	Active
STORAGE FACILITY EAST STEEL	13852	No	Storage	-	-	Active
STORAGE FACILITY WEST CONCRETE	13853	No	Storage	-	-	Active
TP FOR BIG HORN RIVER	2810	No	Treatment Plant	-	-	Active

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Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
TP FOR BIG HORN RIVER	2810	Coagulation	Particulate removal
TP FOR BIG HORN RIVER	2810	Filtration, Rapid Sand	Particulate removal
TP FOR BIG HORN RIVER	2810	Rapid Mix	Particulate removal
TP FOR BIG HORN RIVER	2810	Sedimentation	Particulate removal
TP FOR BIG HORN RIVER	2810	Gaseous Chlorination, Post	Disinfection

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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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