Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	MT0000291
PWS Name	MILES CITY CITY OF
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	No
Population Served	9565
County Served	Custer

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 of Treatment (SWTR-Filter)	Long Term 2 Enhanced Surface Water Treatment Rule	Long Term 2 Enhanced Surface Water Treatment Rule	4490417	Known	01-AUG-2025	31-AUG-2025	No
MR	Monitoring of Treatment (SWTR-Filter)	Long Term 2 Enhanced Surface Water Treatment Rule	Long Term 2 Enhanced Surface Water Treatment Rule	4490416	Known	01-JUL-2025	31-JUL-2025	No
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	4490415	Known	01-AUG-2023	31-AUG-2023	Yes
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	4490414	Returned to Compliance	01-DEC-2022	31-DEC-2022	No
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	4490413	Returned to Compliance	01-SEP-2022	30-SEP-2022	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	4490412	Returned to Compliance	01-AUG-2022	31-AUG-2022	Yes
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	4490411	Returned to Compliance	01-JUL-2018	-	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	4489905	Returned to Compliance	01-AUG-2005	31-AUG-2005	Yes
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	523998	Returned to Compliance	01-JUN-1998	30-JUN-1998	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	205098	Returned to Compliance	01-JAN-1998	31-JAN-1998	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	269000	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Xylenes, Total	268100	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	268600	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	268900	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	269300	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	269400	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	269600	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	270000	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	268800	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	269100	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	269200	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	269900	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	269500	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	268700	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	268500	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	270100	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	269700	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	269800	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Vinyl chloride	268400	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	268200	Returned to Compliance	01-JAN-1997	31-DEC-1997	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	4472696	Returned to Compliance	01-FEB-1996	29-FEB-1996	No
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	765595	Returned to Compliance	01-MAY-1995	31-MAY-1995	Yes
MR	Monitoring, Repeat Major (TCR)	Total Coliform Rule	Coliform (TCR)	52795	Returned to Compliance	01-OCT-1994	31-OCT-1994	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	403895	Returned to Compliance	01-AUG-1994	31-AUG-1994	Yes
MR	Monitoring, Repeat Minor (TCR)	Total Coliform Rule	Coliform (TCR)	627594	Returned to Compliance	01-AUG-1994	31-AUG-1994	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	517994	Returned to Compliance	01-JUN-1994	30-JUN-1994	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	479694	Returned to Compliance	01-MAY-1994	31-MAY-1994	No
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	390295	Returned to Compliance	01-MAY-1994	31-MAY-1994	Yes
MR	Monitoring, Regular	Inorganic Chemicals	CYANIDE	1411996	Returned to Compliance	01-JAN-1994	31-DEC-1994	No
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	207895	Returned to Compliance	01-OCT-1993	31-OCT-1993	Yes

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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
4482433	4490416	SIE	State Public Notification requested	17-SEP-2025	State	-
4482437	4490417	SIE	State Public Notification requested	17-SEP-2025	State	-
4482430	4490415	SFL	State Administrative/Compliance Order without penalty issued	13-MAR-2024	State	PEATS XML 2024-03-20 12:45:13
4482422	4490414	SOX	State Compliance achieved	16-FEB-2023	State	System failed to continuously monitor chlorine residual at the point of entry to the distribution system for most of the month of December. JRS 02/16/2023.
4482417	4490413	SOX	State Compliance achieved	30-SEP-2022	State	Failure to maintain microbial disinfection. Chlorine residual at point of entry fell below 0.2 mg/L. JRS 9/27/2022. System returned to compliance with the monthly monitoring report for the month of October. Public notice was provided 9/30/2022. JRS 11/23/2022
4482416	4490412	SOX	State Compliance achieved	02-SEP-2022	State	FTM chlorine residual at POE (no calibration of continuous chlorine analyzer), Failure to notify DEQ when chlorine residual fell below 0.2 mg/L. 9/2/2022 JRS. System returned to compliance with the monthly monitoring report for the month of October. Public notice was provided 9/26/2022. JRS 11/23/2022
4482412	4490411	SOX	State Compliance achieved	20-JUL-2018	State	7/20/2018 2017 CCR received, SJP;
4482009	627594	SOX	State Compliance achieved	07-JAN-2009	State	6 months no MCL or MR violations. LRA 1/7/2009
4482009	523998	SOX	State Compliance achieved	07-JAN-2009	State	6 months no MCL or MR violations. LRA 1/7/2009
4482009	517994	SOX	State Compliance achieved	07-JAN-2009	State	6 months no MCL or MR violations. LRA 1/7/2009
4482009	403895	SOX	State Compliance achieved	07-JAN-2009	State	6 months no MCL or MR violations. LRA 1/7/2009
4482009	205098	SOX	State Compliance achieved	07-JAN-2009	State	6 months no MCL or MR violations. LRA 1/7/2009
4482009	52795	SOX	State Compliance achieved	07-JAN-2009	State	6 months no MCL or MR violations. LRA 1/7/2009
4482009	4472696	SOX	State Compliance achieved	07-JAN-2009	State	6 months no MCL or MR violations. LRA 1/7/2009
4482009	4489905	SOX	State Compliance achieved	07-JAN-2009	State	6 months no MCL or MR violations. LRA 1/7/2009
4482009	479694	SOX	State Compliance achieved	07-JAN-2009	State	6 months no MCL or MR violations. LRA 1/7/2009
4481809	269400	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	269500	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	269600	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	269700	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	269800	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	269900	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	270000	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	270100	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	1411996	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	269300	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	269200	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	269100	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	269000	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	268900	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	268800	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	268700	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	268600	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	268500	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	268400	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	268200	SOX	State Compliance achieved	31-DEC-2008	State	-
4481809	268100	SOX	State Compliance achieved	31-DEC-2008	State	-
4481996	765595	SOX	State Compliance achieved	01-JUN-1996	State	Returned to Compliance. JW
4481996	207895	SOX	State Compliance achieved	01-JUN-1996	State	Returned to Compliance. JW
4481996	390295	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 YELLOWSTONE RIVER	10125	Yes	Intake	Surface water	Permanent	Active
WELL 1 SODA	6531	Yes	Well	Ground water	Permanent	Inactive
CLEARWELL CONTACT BASIN SWTP	19664	No	Clear Well	-	-	Inactive
DISTRIBUTION SYSTEM	8310	No	Distribution System/Zone	-	-	Active
RAW WATER PUMP STATION	19663	No	Pump Facility	-	-	Inactive
SOUTHGATE BOOSTER STATION	19665	No	Pump Facility	-	-	Inactive
SOUTHGATE 0.2 MG	12175	No	Storage	-	-	Active
RIVERSIDE PARK 0.5 MG	18276	No	Storage	-	-	Active
CARBON HILL 1.5 MG	19277	No	Storage	-	-	Active
STORAGE FACILITY 250,000 GAL RIVERSIDE	12174	No	Storage	-	-	Inactive
STORAGE FACILITY 1 1500000 GAL CONCRETE	336	No	Storage	-	-	Inactive
SOUTHGATE CHLORINE BOOSTER	19666	No	Treatment Plant	-	-	Active
TREATMENT PLANT FOR YELLOWSTONE RIVER	2430	No	Treatment Plant	-	-	Active

1 - 13 of 13

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
SOUTHGATE CHLORINE BOOSTER	19666	Hypochlorination, Post	Disinfection
TREATMENT PLANT FOR YELLOWSTONE RIVER	2430	Gaseous Chlorination, Post	Disinfection
TREATMENT PLANT FOR YELLOWSTONE RIVER	2430	Filtration, Rapid Sand	Particulate removal
TREATMENT PLANT FOR YELLOWSTONE RIVER	2430	Coagulation	Particulate removal
TREATMENT PLANT FOR YELLOWSTONE RIVER	2430	Flocculation	Particulate removal
TREATMENT PLANT FOR YELLOWSTONE RIVER	2430	Rapid Mix	Particulate removal
TREATMENT PLANT FOR YELLOWSTONE RIVER	2430	Sedimentation	Particulate removal

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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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