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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
TT	Single Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	7958725	Returned to Compliance	01-MAR-2024	31-MAR-2024	Yes
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	7958720	Open	14-SEP-2018	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	7958715	Returned to Compliance	01-JAN-2017	31-MAR-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	7958710	Returned to Compliance	01-APR-2011	30-JUN-2011	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	7958709	Returned to Compliance	01-JAN-2011	31-MAR-2011	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	7958105	Returned to Compliance	01-MAY-2005	31-MAY-2005	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	7504305	Returned to Compliance	01-JAN-2005	31-JAN-2005	Yes
MR	Monitoring, Regular	Arsenic Rule	Arsenic	6952696	Returned to Compliance	01-JUL-1996	31-DEC-1996	No
MR	Monitoring, Regular	Inorganic Chemicals	Fluoride	6952796	Returned to Compliance	01-JUL-1996	31-DEC-1996	No

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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
2073034	7958725	SOX	State Compliance achieved	04-APR-2024	State	-
2073026	7958720	SIA	State Violation/Reminder Notice	06-NOV-2018	State	-
2073022	7958715	SOX	State Compliance achieved	03-APR-2017	State	-
2073015	7958709	SOX	State Compliance achieved	28-SEP-2011	State	-
2073015	7958710	SOX	State Compliance achieved	28-SEP-2011	State	-
2073008	7504305	SOX	State Compliance achieved	11-FEB-2008	State	-
2073008	7958105	SOX	State Compliance achieved	11-FEB-2008	State	-
797	6952696	SOX	State Compliance achieved	02-MAY-1997	State	-
797	6952796	SOX	State Compliance achieved	02-MAY-1997	State	-

• 1 - 9 of 9

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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
IN FROM OBERLIN W BR BLACK RIVER RESERVO	21702	Yes	Intake	Surface water	Permanent	Active
UPGROUND RESERVOIR 386 MG	39523	Yes	Reservoir	Surface water	Permanent	Active
RIVER INTAKE AND SCREEN BLDG	39608	Yes	Intake	Surface water	Seasonal	Active
CLEARWELL	39524	No	Clear Well	-	-	Inactive
OBERLIN WATER DEPARTMENT DISTRIBUTION	26698	No	Distribution System/Zone	-	-	Active
RAW PUMPS 1 AND 2	39522	No	Pump Facility	-	-	Active
HIGH SERVICE PUMPS 1, 2, 3, 4	39525	No	Pump Facility	-	-	Active
Oberlin Water Department P01	96809	No	Sampling Station	-	-	Inactive
CLEARWELL	46059	No	Storage	-	-	Active
EAST TANK	588	No	Storage	-	-	Active
WEST TANK	589	No	Storage	-	-	Active
OBERLIN WATER DEPARTMENT	4937	No	Treatment Plant	-	-	Active

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Treatment Processes

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Facility Name	Facility ID	Treatment Process	Treatment Objective
OBERLIN WATER DEPARTMENT	4937	Filtered	Other
OBERLIN WATER DEPARTMENT	4937	Permanganate	Taste / odor control
OBERLIN WATER DEPARTMENT	4937	Coagulation	Particulate removal
OBERLIN WATER DEPARTMENT	4937	Coagulation	Particulate removal
OBERLIN WATER DEPARTMENT	4937	Lime - Soda Ash Addition	Softening (hardness removal)
OBERLIN WATER DEPARTMENT	4937	Rapid Mix	Particulate removal
OBERLIN WATER DEPARTMENT	4937	Flocculation	Particulate removal
OBERLIN WATER DEPARTMENT	4937	Sedimentation	Particulate removal
OBERLIN WATER DEPARTMENT	4937	Innovative	Softening (hardness removal)
OBERLIN WATER DEPARTMENT	4937	Gaseous Chlorination, Pre	Disinfection
OBERLIN WATER DEPARTMENT	4937	Filtration, Rapid Sand	Particulate removal
OBERLIN WATER DEPARTMENT	4937	Gaseous Chlorination, Post	Disinfection
OBERLIN WATER DEPARTMENT	4937	Fluoridation	Other
OBERLIN WATER DEPARTMENT	4937	Inhibitor, Polyphosphate	Particulate removal

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