Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	LA1097010
PWS Name	CITY OF OPELOUSAS WATER SYSTEM
PWS Type	Community water system
Owner Type	Local government
Primary Source	Ground water
Primacy Type	State
Is Wholesaler?	No
Population Served	20388
County Served	St. Landry 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
TT	Failure To Address Deficiency	Ground Water Rule	Groundwater Rule	4010544	Open	02-APR-2025	-	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	4010539	Returned to Compliance	17-JUL-2024	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	4010538	Returned to Compliance	01-JUL-2024	-	No
TT	Failure To Address Deficiency	Ground Water Rule	Groundwater Rule	4010532	Returned to Compliance	04-JUN-2024	-	Yes
TT	Failure To Address Deficiency	Ground Water Rule	Groundwater Rule	4010495	Open	27-OCT-2021	-	Yes
TT	Failure To Address Deficiency	Ground Water Rule	Groundwater Rule	4010493	Returned to Compliance	27-OCT-2021	-	Yes
TT	Failure To Address Deficiency	Ground Water Rule	Groundwater Rule	4010494	Open	27-OCT-2021	-	Yes
TT	Failure To Address Deficiency	Ground Water Rule	Groundwater Rule	4010496	Returned to Compliance	27-OCT-2021	-	Yes
TT	Failure To Address Deficiency	Ground Water Rule	Groundwater Rule	4010472	Open	22-AUG-2019	-	Yes
MR	Lead Consumer Notice	Lead and Copper Rule	Lead and Copper Rule	4010462	Returned to Compliance	08-JUN-2018	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	4010444	Returned to Compliance	01-JUL-2016	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	4010431	Returned to Compliance	01-JUL-2015	-	No
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	4010429	Returned to Compliance	01-OCT-2014	-	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	4010421	Returned to Compliance	01-MAR-2014	31-MAY-2014	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	4010420	Returned to Compliance	01-MAR-2014	31-MAY-2014	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	4010418	Returned to Compliance	01-AUG-2013	31-AUG-2013	Yes
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	4010407	Returned to Compliance	01-JUL-2008	-	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	4010406	Known	01-APR-2008	30-APR-2008	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	4010003	Known	01-JUL-2003	31-JUL-2003	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	4009602	Known	01-JUL-2002	31-JUL-2002	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	4009402	Known	01-JUN-2002	30-JUN-2002	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	4005201	Known	01-SEP-2001	30-SEP-2001	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	4002501	Known	01-JUN-2001	30-JUN-2001	Yes
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	1V01	Returned to Compliance	01-JUL-2000	26-NOV-2000	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	1V00	Returned to Compliance	19-OCT-1999	26-NOV-2000	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	4003799	Known	01-SEP-1999	30-SEP-1999	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	4002396	Known	01-FEB-1996	29-FEB-1996	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	4000496	Known	01-OCT-1995	31-OCT-1995	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	4005795	Known	01-AUG-1995	31-AUG-1995	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	4009294	Known	01-AUG-1994	31-AUG-1994	Yes

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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
9201865	4010495	SID	State Site Visit for enforcement purposes	15-OCT-2025	State	AO No. C-22-097-021-ETT - I/C with ORSIs 7.), 9.), and 12.). O/C with ORAI 10.) - slw.
9201865	4010472	SID	State Site Visit for enforcement purposes	15-OCT-2025	State	AO No. C-22-097-021-ETT - I/C with ORSIs 7.), 9.), and 12.). O/C with ORAI 10.) - slw.
9201852	4010544	SIF	State Public Notification received	07-JUL-2025	State	-
9201857	4010538	SOX	State Compliance achieved	13-JUN-2025	State	-
9201832	4010532	SOX	State Compliance achieved	19-FEB-2025	State	-
9201830	4010539	SOX	State Compliance achieved	30-JAN-2025	State	-
9201817	4010462	SOX	State Compliance achieved	27-MAR-2023	State	-
9201813	4010493	SID	State Site Visit for enforcement purposes	02-FEB-2023	State	AO No. C-22-097-021-ETT - I/C with ORAI 2.) - slw.
9201813	4010494	SID	State Site Visit for enforcement purposes	02-FEB-2023	State	AO No. C-22-097-021-ETT - I/C with ORAI 2.) - slw.
9201812	4010496	SOX	State Compliance achieved	01-FEB-2023	State	-
9201781	4010420	SOX	State Compliance achieved	09-FEB-2017	State	-
9201781	4010421	SOX	State Compliance achieved	09-FEB-2017	State	-
9201778	4010444	SIA	State Violation/Reminder Notice	12-DEC-2016	State	-
9201776	4010431	SIA	State Violation/Reminder Notice	15-OCT-2015	State	-
9201775	4010429	SOX	State Compliance achieved	08-JAN-2015	State	-
9201769	4010418	SOX	State Compliance achieved	29-OCT-2013	State	-
9201718	4010407	SOX	State Compliance achieved	27-APR-2009	State	SENT IN 2007 CCR CERTIFICATION FORM
9201710	4010406	SIF	State Public Notification received	09-JUN-2008	State	-
9201703	4010003	SIF	State Public Notification received	22-SEP-2003	State	-
9201002	4009402	SIF	State Public Notification received	14-AUG-2002	State	-
9201002	4009602	SIF	State Public Notification received	14-AUG-2002	State	-
52201	4005201	SIE	State Public Notification requested	28-SEP-2001	State	-
25201	4002501	SIE	State Public Notification requested	05-JUL-2001	State	-
2E04	1V01	EOX	Federal Compliance achieved	26-NOV-2000	ODSWeb	-
2E04	1V00	EOX	Federal Compliance achieved	26-NOV-2000	ODSWeb	-
37299	4003799	SIE	State Public Notification requested	01-OCT-1999	State	-
1E96	4009294	EFJ	Federal issued Formal Notice of Violation	25-JUN-1996	ODSWeb	-
1E96	4005795	EFJ	Federal issued Formal Notice of Violation	25-JUN-1996	ODSWeb	-
1E96	4002396	EFJ	Federal issued Formal Notice of Violation	25-JUN-1996	ODSWeb	-
1E96	4000496	EFJ	Federal issued Formal Notice of Violation	25-JUN-1996	ODSWeb	-

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All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
WALMART- WELL #1	12320	Yes	Well	Ground water	Other	Inactive
WELL #6 -NW OF PLANT BY SLUDGE BASIN	7271	Yes	Well	Ground water	Permanent	Active
WELL #2- ON RAILROAD AVE BY OLD CLR WELL	7270	Yes	Well	Ground water	Permanent	Active
WELL #8 - AT PLNT ENTR BY GENERATOR	7269	Yes	Well	Ground water	Permanent	Active
MEDSOUTH WELL #1 - NEXT TO PLANTGATE	7268	Yes	Well	Ground water	Permanent	Active
WELL #7 - WEST OF CLECO ELEC SUBSTATION	7263	Yes	Well	Ground water	Permanent	Active
MEDSOUTH WELL #2 - NEXT TO GRND STORAGE	17886	Yes	Well	Ground water	Permanent	Active
KERR STREET WELL - ABANDONED	7267	Yes	Well	Ground water	Other	Inactive
CRESSWELL LANE WELL	7266	Yes	Well	Ground water	Other	Inactive
WELL #5 - ABANDONED	7265	Yes	Well	Ground water	Other	Inactive
WELL #4 - ABANDONED	7264	Yes	Well	Ground water	Other	Inactive
WALMART- WELL #2	12321	Yes	Well	Ground water	Other	Inactive
DISTRIBUTION SYSTEM	9154	No	Distribution System/Zone	-	-	Active
MAIN PLANT - 750 KVA - DIESEL	19437	No	Other	-	-	Active
MAIN PLANT - 350 KVA - DIESEL	19438	No	Other	-	-	Active
MEDSOUTH PLANT - 400 KVA - DIESEL	19441	No	Other	-	-	Active
GROLEE GENERATOR - 400 KVA - DIESEL	21179	No	Other	-	-	Active
WELLS #2,#6,#7,#8 SERVICE PUMPS	12323	No	Pump Facility	-	-	Active
MEDSOUTH WELL SERVICE PUMPS	12330	No	Pump Facility	-	-	Active
GROLEE PUMP FACILITY	21180	No	Pump Facility	-	-	Active
WALMART SERVICE PUMPS	12333	No	Pump Facility	-	-	Inactive
ELEVATED TOWER	12324	No	Storage	-	-	Active
MEDSOUTH WELL GROUND STORAGE	12329	No	Storage	-	-	Active
CLEAR WELL	19449	No	Storage	-	-	Active
GROLEE GROUND STORAGE	21178	No	Storage	-	-	Active
WALMART GROUND STORAGE TANK	12332	No	Storage	-	-	Inactive
WALMART PRESSURE TANK	12334	No	Storage	-	-	Inactive
WELLS #2,#6,#7,#8 TREATMENT PLNT	12322	No	Treatment Plant	-	-	Active
MEDSOUTH WELLS TREATMENT PLNT	12328	No	Treatment Plant	-	-	Active
CRESSWELL LN WELL TREATMENT PLNT	12325	No	Treatment Plant	-	-	Inactive
KERR ST WELL TREATMENT PLNT	12327	No	Treatment Plant	-	-	Inactive
WALMART TREATMENT PLNT	12331	No	Treatment Plant	-	-	Inactive

1 - 32 of 32

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
WELLS #2,#6,#7,#8 TREATMENT PLNT	12322	Coagulation	Softening (hardness removal)
WELLS #2,#6,#7,#8 TREATMENT PLNT	12322	Coagulation	Softening (hardness removal)
WELLS #2,#6,#7,#8 TREATMENT PLNT	12322	Coagulation	Softening (hardness removal)
WELLS #2,#6,#7,#8 TREATMENT PLNT	12322	Flocculation	Softening (hardness removal)
WELLS #2,#6,#7,#8 TREATMENT PLNT	12322	Sedimentation	Softening (hardness removal)
WELLS #2,#6,#7,#8 TREATMENT PLNT	12322	Filtration, Rapid Sand	Iron removal
WELLS #2,#6,#7,#8 TREATMENT PLNT	12322	Aeration, Cascade	Iron removal
WELLS #2,#6,#7,#8 TREATMENT PLNT	12322	Gaseous Chlorination, Post	Disinfection
WELLS #2,#6,#7,#8 TREATMENT PLNT	12322	Gaseous Chlorination, Pre	Disinfection
WELLS #2,#6,#7,#8 TREATMENT PLNT	12322	Lime - Soda Ash Addition	Softening (hardness removal)
WELLS #2,#6,#7,#8 TREATMENT PLNT	12322	Sedimentation	Inorganics removal
WELLS #2,#6,#7,#8 TREATMENT PLNT	12322	Innovative	Corrosion control
CRESSWELL LN WELL TREATMENT PLNT	12325	Sequestration	Iron removal
CRESSWELL LN WELL TREATMENT PLNT	12325	Gaseous Chlorination, Post	Disinfection
CRESSWELL LN WELL TREATMENT PLNT	12325	Inhibitor, Polyphosphate	Corrosion control
MEDSOUTH WELLS TREATMENT PLNT	12328	Sequestration	Iron removal
MEDSOUTH WELLS TREATMENT PLNT	12328	Gaseous Chlorination, Post	Disinfection
MEDSOUTH WELLS TREATMENT PLNT	12328	Inhibitor, Polyphosphate	Corrosion control
WALMART TREATMENT PLNT	12331	Filtration, Pressure Sand	Iron removal
WALMART TREATMENT PLNT	12331	Permanganate	Iron removal
WALMART TREATMENT PLNT	12331	Ion Exchange	Softening (hardness removal)
WALMART TREATMENT PLNT	12331	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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