Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	LA1101006
PWS Name	PATTERSON WATER SYSTEM
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	No
Population Served	8456
County Served	St. Mary Parish

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	TTHM	3000832	Known	01-OCT-2025	31-DEC-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	3000829	Known	01-JUL-2025	30-SEP-2025	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	3000827	Returned to Compliance	29-APR-2025	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	3000826	Known	01-APR-2025	30-JUN-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	3000825	Known	01-JAN-2025	31-MAR-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	3000823	Known	01-OCT-2024	31-DEC-2024	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	3000810	Returned to Compliance	01-FEB-2010	28-FEB-2010	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	3000808	Returned to Compliance	01-JAN-2010	31-JAN-2010	Yes
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	3000807	Returned to Compliance	01-JUL-2008	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	3000805	Returned to Compliance	01-JUL-2004	-	No
MCL	Maximum Contaminant Level Violation, Acute (TCR)	Total Coliform Rule	Coliform (TCR)	3000400	Known	15-SEP-2000	14-OCT-2000	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	3000295	Known	01-NOV-1994	30-NOV-1994	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	3002394	Known	01-APR-1994	30-APR-1994	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	4001494	Returned to Compliance	01-JAN-1994	31-JAN-1994	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	4001194	Known	01-DEC-1993	31-DEC-1993	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	4005293	Known	01-JUL-1993	31-JUL-1993	Yes
MR	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	Lead and Copper Rule	10893	Returned to Compliance	01-JUL-1992	15-FEB-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
401060	3000832	SIF	State Public Notification received	04-DEC-2025	State	-
401053	3000829	SIF	State Public Notification received	25-AUG-2025	State	-
401052	3000826	SIF	State Public Notification received	25-AUG-2025	State	-
401051	3000825	SIF	State Public Notification received	25-AUG-2025	State	-
401050	3000827	SOX	State Compliance achieved	20-AUG-2025	State	-
401041	3000823	SIF	State Public Notification received	14-JAN-2025	State	-
401014	3000810	SOX	State Compliance achieved	18-MAR-2010	State	ALL VIOLATIONS AND ENFORCEMENT ACTIONS HAVE BEEN RESOLVED
401015	3000808	SOX	State Compliance achieved	18-MAR-2010	State	ALL VIOLATIONS AND ENFORCEMENT ACTIONS HAVE BEEN RESOLVED
401007	3000807	SOX	State Compliance achieved	16-JAN-2009	State	COMPLETED 2007 CCR
401005	3000805	SOX	State Compliance achieved	22-JUL-2005	State	BROUGHT INTO COMPLIANCE WITH 2005 CCR.
4300	3000400	SIF	State Public Notification received	25-SEP-2000	State	-
14994	4001494	SOX	State Compliance achieved	20-MAY-1996	State	-
2295	3000295	SIE	State Public Notification requested	09-DEC-1994	State	-
1E94	3002394	EFJ	Federal issued Formal Notice of Violation	23-AUG-1994	ODSWeb	-
1E94	4005293	EFJ	Federal issued Formal Notice of Violation	23-AUG-1994	ODSWeb	-
1E94	10893	EFJ	Federal issued Formal Notice of Violation	23-AUG-1994	ODSWeb	-
1E94	4001194	EFJ	Federal issued Formal Notice of Violation	23-AUG-1994	ODSWeb	-

1 - 17 of 17

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
PURCHASE FROM 1101015 ST MARY 2 (BV)	22389	Yes	Consecutive Connection	Surface water	Emergency	Active
BAYOU TECHE INTAKE	8386	Yes	Intake	Surface water	Permanent	Inactive
BAYOU TECHE RW INTAKE-2	21371	Yes	Intake	Surface water	Permanent	Active
PURCHASE FROM 1101010-ST MARY 3	22390	Yes	Consecutive Connection	Surface water	Emergency	Active
PURCHASE FROM 1101010 ST MARY 3	22391	Yes	Consecutive Connection	Surface water	Emergency	Active
CLEARWELL	19083	No	Clear Well	-	-	Active
DISTRIBUTION SYSTEM	9191	No	Distribution System/Zone	-	-	Active
Stage2 IDSE	17332	No	Distribution System/Zone	-	-	Inactive
PATTERSON TOWER	417	No	Storage	-	-	Active
GROUND	995	No	Storage	-	-	Inactive
2020 SURFACE WATER TREATMENT PLANT	21372	No	Treatment Plant	-	-	Active
SURFACE WATER TREATMENT PLANT	4137	No	Treatment Plant	-	-	Inactive

1 - 12 of 12

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
2020 SURFACE WATER TREATMENT PLANT	21372	Chlorine Dioxide	Disinfection
2020 SURFACE WATER TREATMENT PLANT	21372	Inhibitor, Orthophosphate	Corrosion control
2020 SURFACE WATER TREATMENT PLANT	21372	Filtered	Particulate removal
2020 SURFACE WATER TREATMENT PLANT	21372	Hypochlorination, Pre	Disinfection
SURFACE WATER TREATMENT PLANT	4137	Chlorine Dioxide	Disinfection by-products control
SURFACE WATER TREATMENT PLANT	4137	Gaseous Chlorination, Pre	Disinfection
SURFACE WATER TREATMENT PLANT	4137	Chloramines	Disinfection by-products control
SURFACE WATER TREATMENT PLANT	4137	Filtration, Rapid Sand	Particulate removal
SURFACE WATER TREATMENT PLANT	4137	Inhibitor, Orthophosphate	Corrosion control
SURFACE WATER TREATMENT PLANT	4137	Algae Control	Organics 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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