Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	MT0000174
PWS Name	CHINOOK CITY OF
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	No
Population Served	1300
County Served	Blaine

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	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	1569316	Returned to Compliance	01-OCT-2025	31-DEC-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	1569315	Returned to Compliance	01-JUL-2025	30-SEP-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	1569314	Returned to Compliance	01-APR-2025	30-JUN-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	1569313	Returned to Compliance	01-JAN-2025	31-MAR-2025	Yes
MR	Monitoring, Repeat Minor (TCR)	Total Coliform Rule	Coliform (TCR)	1569312	Returned to Compliance	01-OCT-2014	31-OCT-2014	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	1569311	Returned to Compliance	01-APR-2011	30-JUN-2011	Yes
MR	Monitoring, Regular	Inorganic Chemicals	Fluoride	1569105	Returned to Compliance	01-JAN-2004	31-DEC-2004	No
MR	Monitoring, Regular	Inorganic Chemicals	Fluoride	1565804	Returned to Compliance	01-JAN-2003	31-DEC-2003	No
MR	Monitoring, Regular	Arsenic Rule	Arsenic	1569005	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MCL	Maximum Contaminant Level Violation, Single Sample	Volatile Organic Chemicals	DICHLOROMETHANE	1565703	Returned to Compliance	01-JAN-2000	31-DEC-2000	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	1564499	Returned to Compliance	01-JAN-1999	31-JAN-1999	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	180998	Returned to Compliance	01-NOV-1997	30-NOV-1997	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	135998	Returned to Compliance	01-OCT-1997	31-OCT-1997	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	43698	Returned to Compliance	01-SEP-1997	30-SEP-1997	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	1088097	Returned to Compliance	01-AUG-1997	31-AUG-1997	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	774495	Returned to Compliance	01-JUN-1995	30-JUN-1995	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	759595	Returned to Compliance	01-MAY-1995	31-MAY-1995	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	601895	Returned to Compliance	01-APR-1995	30-APR-1995	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	544495	Returned to Compliance	01-FEB-1995	28-FEB-1995	Yes
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	479094	Returned to Compliance	01-MAY-1994	31-MAY-1994	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	388394	Returned to Compliance	01-JAN-1994	31-JAN-1994	No
MR	Monitoring, Regular	Inorganic Chemicals	Antimony, Total	1500696	Returned to Compliance	01-JAN-1994	31-DEC-1994	No
MR	Monitoring, Regular	Inorganic Chemicals	Nickel	1500596	Returned to Compliance	01-JAN-1994	31-DEC-1994	No
MR	Monitoring, Regular	Inorganic Chemicals	Thallium, Total	1500496	Returned to Compliance	01-JAN-1994	31-DEC-1994	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	994895	Returned to Compliance	01-JAN-1993	31-DEC-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	994995	Returned to Compliance	01-JAN-1993	31-DEC-1993	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
4628744	1569316	SOX	State Compliance achieved	11-DEC-2025	State	System RTC with 1QT26 sample bringing the LRAA down to 51ug/L. PMT 3/13/26
4628741	1569314	SIF	State Public Notification received	05-NOV-2025	State	Received PN 07/02//2025-PMT
4628740	1569315	SOX	State Compliance achieved	16-SEP-2025	State	System RTC with 1QT26 sample bringing the LRAA down to 51ug/L. PMT 3/13/26
4628734	1569313	SOX	State Compliance achieved	28-MAR-2025	State	System RTC with 1QT26 sample bringing the LRAA down to 51ug/L. PMT 3/13/26
4628729	1569312	SIE	State Public Notification requested	17-NOV-2014	State	-
4628727	1569311	SIF	State Public Notification received	12-DEC-2011	State	RECEIVED PUBLIC NOTICE IN JULY 2011
4628709	388394	SOX	State Compliance achieved	31-DEC-2008	State	6 months no MCL or MR violations. LRA 12/31/2008
4628709	479094	SOX	State Compliance achieved	31-DEC-2008	State	6 months no MCL or MR violations. LRA 12/31/2008
4628405	1500596	SOX	State Compliance achieved	26-SEP-2005	State	-
4628405	1500496	SOX	State Compliance achieved	26-SEP-2005	State	-
4628405	994995	SOX	State Compliance achieved	26-SEP-2005	State	-
4628405	1500696	SOX	State Compliance achieved	26-SEP-2005	State	-
4628405	994895	SOX	State Compliance achieved	26-SEP-2005	State	-
4628405	1569105	SOX	State Compliance achieved	26-SEP-2005	State	-
4628405	1565804	SOX	State Compliance achieved	26-SEP-2005	State	-
4627905	1569005	SIE	State Public Notification requested	13-APR-2005	State	-
4627705	1565703	SOX	State Compliance achieved	04-NOV-2004	State	10/17/01 sample.
4626900	1088097	SOX	State Compliance achieved	31-DEC-1999	State	Returned to Compliance. JW
4626900	774495	SOX	State Compliance achieved	31-DEC-1999	State	Returned to Compliance. JW
4626900	759595	SOX	State Compliance achieved	31-DEC-1999	State	Returned to Compliance. JW
4626900	544495	SOX	State Compliance achieved	31-DEC-1999	State	Returned to Compliance. JW
4626900	180998	SOX	State Compliance achieved	31-DEC-1999	State	Returned to Compliance. JW
4626900	135998	SOX	State Compliance achieved	31-DEC-1999	State	Returned to Compliance. JW
4626900	43698	SOX	State Compliance achieved	31-DEC-1999	State	Returned to Compliance. JW
4626900	1564499	SOX	State Compliance achieved	31-DEC-1999	State	Returned to Compliance. JW
4626900	601895	SOX	State Compliance achieved	31-DEC-1999	State	Returned to Compliance. JW

1 - 26 of 26

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
INTAKE MILK RIVER	8248	Yes	Intake	Surface water	Permanent	Active
CLEAR WELL 200,000 GAL	13001	No	Clear Well	-	-	Active
DISTRIBUTION SYSTEM	9988	No	Distribution System/Zone	-	-	Active
STORAGE TANK 300,000 GAL	15596	No	Storage	-	-	Active
STORAGE TANK 100,000 GAL	15597	No	Storage	-	-	Active
TP FOR MILK RIVER SOURCE	2787	No	Treatment Plant	-	-	Active

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Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
TP FOR MILK RIVER SOURCE	2787	Filtration, Rapid Sand	Particulate removal
TP FOR MILK RIVER SOURCE	2787	Flocculation	Particulate removal
TP FOR MILK RIVER SOURCE	2787	Coagulation	Particulate removal
TP FOR MILK RIVER SOURCE	2787	Sedimentation	Particulate removal
TP FOR MILK RIVER SOURCE	2787	Activated Carbon, Powdered	Taste / odor control
TP FOR MILK RIVER SOURCE	2787	Ultraviolet Radiation	Disinfection
TP FOR MILK RIVER SOURCE	2787	Permanganate	Taste / odor control
TP FOR MILK RIVER SOURCE	2787	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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