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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
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	4747309	Open	01-OCT-2025	-	No
RPT	Notification, Known or Potential LSL	Lead and Copper Rule Revisions	LEAD AND COPPER RULE REVISIONS	4747308	Open	02-JUL-2025	-	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	4747306	Returned to Compliance	01-JAN-2017	-	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	4747305	Returned to Compliance	01-OCT-2013	-	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	4747302	Returned to Compliance	01-AUG-2002	31-AUG-2002	Yes
MR	Monitoring, Regular	Nitrate Rule	Nitrate	2449393	Returned to Compliance	01-JUL-1993	30-SEP-1993	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	2449293	Returned to Compliance	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Inorganic Chemicals	Barium	2504893	Returned to Compliance	01-JAN-1993	31-JAN-1993	No
MR	Monitoring, Regular	Inorganic Chemicals	Chromium	2505193	Returned to Compliance	01-JAN-1993	31-JAN-1993	No
MR	Monitoring, Regular	Inorganic Chemicals	Cadmium	2505093	Returned to Compliance	01-JAN-1993	31-JAN-1993	No
MR	Monitoring, Regular	Inorganic Chemicals	Mercury	2504793	Returned to Compliance	01-JAN-1993	31-JAN-1993	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	2449193	Returned to Compliance	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Inorganic Chemicals	Selenium	2505493	Returned to Compliance	01-JAN-1993	31-JAN-1993	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	1999992	Known	01-MAY-1992	31-MAY-1992	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	1982092	Known	01-APR-1992	30-APR-1992	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	1956892	Known	01-MAR-1992	31-MAR-1992	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	1917392	Known	01-FEB-1992	29-FEB-1992	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	1845992	Known	01-JAN-1992	31-JAN-1992	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
2504912	4747308	SIE	State Public Notification requested	15-DEC-2025	State	-
2504908	4747306	SOX	State Compliance achieved	01-NOV-2019	State	-
2504910	4747305	SOX	State Compliance achieved	27-SEP-2019	State	PWS COLLECTED ALL REQUIRED RT SAMPLES 9/27/2019
2504902	4747302	SOX	State Compliance achieved	01-FEB-2003	State	-
1188493	2505193	SOX	State Compliance achieved	10-OCT-1994	State	-
1052393	2505493	SOX	State Compliance achieved	03-OCT-1994	State	-
1052393	2505093	SOX	State Compliance achieved	03-OCT-1994	State	-
1052393	2504793	SOX	State Compliance achieved	03-OCT-1994	State	-
1052393	2449393	SOX	State Compliance achieved	03-OCT-1994	State	-
1052393	2504893	SOX	State Compliance achieved	03-OCT-1994	State	-
892393	2449293	SOX	State Compliance achieved	10-JUL-1993	State	-
892293	2449193	SOX	State Compliance achieved	10-APR-1993	State	-

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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
SENECA CITY OF (P37001)	9125	Yes	Consecutive Connection	Surface water	Emergency	Inactive
LAKE KEOWEE (S37110)	18248	Yes	Intake	Surface water	Permanent	Active
CONEROSS CREEK (S37102)	9123	Yes	Intake	Surface water	Other	Inactive
NEGRO FORK (S37108)	9124	Yes	Intake	Surface water	Emergency	Inactive
DISTRIBUTION	10683	No	Distribution System/Zone	-	-	Active
LAKE KEOWEE PLANT (A37019)	18249	No	Treatment Plant	-	-	Active
WALHALLA CONEROSS WTP (A37005)	7960	No	Treatment Plant	-	-	Inactive

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Treatment Processes

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Facility Name	Facility ID	Treatment Process	Treatment Objective
LAKE KEOWEE PLANT (A37019)	18249	pH Adjustment, Post	Disinfection by-products control
LAKE KEOWEE PLANT (A37019)	18249	Inhibitor, Orthophosphate	Corrosion control
LAKE KEOWEE PLANT (A37019)	18249	Chlorine Dioxide	Disinfection
LAKE KEOWEE PLANT (A37019)	18249	Hypochlorination, Post	Disinfection
LAKE KEOWEE PLANT (A37019)	18249	Hypochlorination, Pre	Disinfection
LAKE KEOWEE PLANT (A37019)	18249	Permanganate	Manganese removal
LAKE KEOWEE PLANT (A37019)	18249	Coagulation	Particulate removal
LAKE KEOWEE PLANT (A37019)	18249	Filtration, Rapid Sand	Particulate removal
LAKE KEOWEE PLANT (A37019)	18249	Sludge Treatment	Particulate removal
LAKE KEOWEE PLANT (A37019)	18249	pH Adjustment, Pre	Particulate removal
LAKE KEOWEE PLANT (A37019)	18249	Fluoridation	Other
WALHALLA CONEROSS WTP (A37005)	7960	pH Adjustment, Post	Corrosion control
WALHALLA CONEROSS WTP (A37005)	7960	pH Adjustment	Corrosion control
WALHALLA CONEROSS WTP (A37005)	7960	pH Adjustment, Pre	Particulate removal
WALHALLA CONEROSS WTP (A37005)	7960	Sludge Treatment	Particulate removal
WALHALLA CONEROSS WTP (A37005)	7960	Sedimentation	Particulate removal
WALHALLA CONEROSS WTP (A37005)	7960	Rapid Mix	Particulate removal
WALHALLA CONEROSS WTP (A37005)	7960	Flocculation	Particulate removal
WALHALLA CONEROSS WTP (A37005)	7960	Filtration, Rapid Sand	Particulate removal
WALHALLA CONEROSS WTP (A37005)	7960	Coagulation	Particulate removal
WALHALLA CONEROSS WTP (A37005)	7960	Gaseous Chlorination, Pre	Disinfection
WALHALLA CONEROSS WTP (A37005)	7960	Gaseous Chlorination, Post	Disinfection
WALHALLA CONEROSS WTP (A37005)	7960	Inhibitor, Orthophosphate	Corrosion control

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