---

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

Go

Rows1510152025501001000All

Actions

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)	Surface Water Treatment Rule	Surface Water Treatment Rule	4001187	Returned to Compliance	01-AUG-2023	31-AUG-2023	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	4001112	Returned to Compliance	01-JUN-2017	31-MAY-2018	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	4001111	Returned to Compliance	01-JUN-2017	31-MAY-2018	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	4001010	Returned to Compliance	01-SEP-2013	30-SEP-2013	No
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	4000806	Returned to Compliance	01-JUL-2005	31-JUL-2005	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	4000705	Returned to Compliance	01-JAN-2005	31-MAR-2005	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	4000194	Known	01-OCT-1993	31-DEC-1993	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	516180	Known	24-JUN-1980	23-JUL-1980	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	516080	Known	24-JUN-1980	23-JUL-1980	No

• 1 - 9 of 9

Column Actions

Search

---

Enforcement Actions

Go

Rows1510152025501001000All

Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
420	4001187	SOX	State Compliance achieved	08-NOV-2023	Region	Received October 2023 monthly report and all chlorine residual values reported were in compliance. 11/8/2023. jc.
416	4001112	SOX	State Compliance achieved	04-MAR-2019	Region	Sample Received in December 2018. swt 3/4/2018
416	4001111	SOX	State Compliance achieved	04-MAR-2019	Region	Sample Received in December 2018. swt 3/4/2018
411	4001010	SIF	State Public Notification received	18-JUN-2014	Region	-
407	4000705	SOX	State Compliance achieved	27-JUL-2007	Region	-
407	4000806	SOX	State Compliance achieved	27-JUL-2007	Region	-

• 1 - 6 of 6

Column Actions

Search

---

All Facilities

Go

Rows1510152025501001000All

Actions

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
GARDNER RIVER INTAKE (BACKUP)	14270	Yes	Intake	Surface water	Other	Active
PANTHER CREEK INTAKE (PRIMARY SOURCE)	14269	Yes	Intake	Surface water	Permanent	Active
YNP-MAMMOTH HOT SPRINGS	14271	No	Distribution System/Zone	-	-	Active
YELLOWSTONE NP MAMMOTH HOT SPG	11707	No	Other	-	-	Inactive
GARAGE	15610	No	Sampling Station	-	-	Inactive
STORAGE TANK (1MG)	16169	No	Storage	-	-	Active
CONTACT BASIN CLEARWELL (34,900 GAL)	19996	No	Storage	-	-	Active
UPPER STORAGE CLEARWELL (160K-GAL)	19997	No	Storage	-	-	Active
UPPER RW STORAGE RESERVOIR (9.2MG)	21238	No	Storage	-	-	Active
UPPER RW STORAGE RESERVOIR (9.2MG)	16168	No	Storage	-	-	Inactive
TREATMENT	15793	No	Treatment Plant	-	-	Active

• 1 - 11 of 11

Column Actions

Search

---

Treatment Processes

Go

Rows1510152025501001000All

Actions

Facility Name	Facility ID	Treatment Process	Treatment Objective
TREATMENT	15793	Hypochlorination, Post	Disinfection
TREATMENT	15793	Coagulation	Particulate removal
TREATMENT	15793	Flocculation	Particulate removal
TREATMENT	15793	Sedimentation	Particulate removal
TREATMENT	15793	Activated Carbon, Powdered	Taste / odor control
TREATMENT	15793	Permanganate	Taste / odor control
TREATMENT	15793	Filtration, Rapid Sand	Particulate removal

• 1 - 7 of 7

Column Actions

Search