Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	TX1080007
PWS Name	CITY OF MERCEDES
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	Yes
Population Served	16258
County Served	Hidalgo

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
MR	Lead Consumer Notice	Lead and Copper Rule	Lead and Copper Rule	630	Open	30-DEC-2025	-	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	629	Returned to Compliance	01-MAY-2025	-	No
RPT	LSL Reporting	Lead and Copper Rule Revisions	LEAD AND COPPER RULE REVISIONS	628	Returned to Compliance	17-OCT-2024	-	No
TT	LSL Inventory	Lead and Copper Rule Revisions	LEAD AND COPPER RULE REVISIONS	627	Returned to Compliance	17-OCT-2024	-	Yes
MR	Monitoring, Source Water (GWR)	Ground Water Rule	E. COLI	618	Returned to Compliance	05-MAY-2020	-	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	592	Returned to Compliance	01-OCT-2013	-	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	588	Open	13-JUL-2013	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	590	Returned to Compliance	01-JUL-2013	30-SEP-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	585	Returned to Compliance	01-APR-2013	30-JUN-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	581	Returned to Compliance	01-JAN-2013	31-MAR-2013	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	536	Returned to Compliance	01-OCT-2012	31-OCT-2012	Yes
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	571	Returned to Compliance	01-OCT-2012	31-DEC-2012	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	568	Returned to Compliance	01-OCT-2012	-	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	572	Returned to Compliance	01-OCT-2012	31-DEC-2012	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	578	Returned to Compliance	01-OCT-2012	31-DEC-2012	Yes
TT	Single Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	562	Returned to Compliance	01-AUG-2012	31-AUG-2012	Yes
MR	Monitoring, Repeat Minor (TCR)	Total Coliform Rule	Coliform (TCR)	521	Returned to Compliance	01-JUN-2011	30-JUN-2011	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	519	Open	15-APR-2011	-	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	517	Open	10-JAN-2011	-	No
MR	Monitoring, Source Water (GWR)	Ground Water Rule	E. COLI	515	Returned to Compliance	01-SEP-2010	-	No
MR	Monitoring, Repeat Major (TCR)	Total Coliform Rule	Coliform (TCR)	514	Returned to Compliance	01-SEP-2010	30-SEP-2010	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	560	Returned to Compliance	01-OCT-2009	31-DEC-2009	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	561	Returned to Compliance	01-OCT-2009	31-DEC-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	554	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	553	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	552	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	551	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	550	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	549	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	548	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	547	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	546	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	545	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	544	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Vinyl chloride	543	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	542	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	541	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	DICHLOROMETHANE	540	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Xylenes, Total	539	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	558	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	538	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	555	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	556	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	557	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	559	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	537	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
MR	Monitoring, Turbidity (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	509	Returned to Compliance	01-NOV-2008	30-NOV-2008	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	407	Returned to Compliance	30-AUG-2007	-	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	307	Returned to Compliance	01-JUN-2007	30-JUN-2007	Yes
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	567	Returned to Compliance	01-JAN-2006	31-DEC-2011	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
1164	628	SOX	State Compliance achieved	03-OCT-2025	State	-
1164	627	SOX	State Compliance achieved	03-OCT-2025	State	-
1165	629	SOX	State Compliance achieved	02-OCT-2025	State	-
1156	618	SIF	State Public Notification received	09-JUL-2021	State	-
1113	566	SOX	State Compliance achieved	26-MAR-2015	State	20150326; MMELICK; RECEIVED 2011 RESULTS.
1113	567	SOX	State Compliance achieved	26-MAR-2015	State	20150326; MMELICK; RECEIVED 2011 RESULTS.
1113	565	SOX	State Compliance achieved	26-MAR-2015	State	20150326; MMELICK; RECEIVED 2011 RESULTS.
1112	592	SOX	State Compliance achieved	12-AUG-2014	State	-
1111	572	SOX	State Compliance achieved	17-APR-2014	State	-
1111	578	SOX	State Compliance achieved	17-APR-2014	State	-
1111	571	SOX	State Compliance achieved	17-APR-2014	State	-
1111	581	SOX	State Compliance achieved	17-APR-2014	State	-
1111	590	SOX	State Compliance achieved	17-APR-2014	State	-
1111	585	SOX	State Compliance achieved	17-APR-2014	State	-
1114	407	SOX	State Compliance achieved	24-JUL-2013	State	-
1085	588	SIA	State Violation/Reminder Notice	23-JUL-2013	State	-
1100	568	SFO	State Administrative/Compliance Order with penalty issued	19-JUL-2013	State	DOCKET NO 2013-0005-PWS-E; FINAL TR DUE DATE 01/30/2014; FILE CLOSED 4/30/2014
1100	536	SFO	State Administrative/Compliance Order with penalty issued	19-JUL-2013	State	DOCKET NO 2013-0005-PWS-E; FINAL TR DUE DATE 01/30/2014; FILE CLOSED 4/30/2014
1100	517	SFO	State Administrative/Compliance Order with penalty issued	19-JUL-2013	State	DOCKET NO 2013-0005-PWS-E; FINAL TR DUE DATE 01/30/2014; FILE CLOSED 4/30/2014
1100	519	SFO	State Administrative/Compliance Order with penalty issued	19-JUL-2013	State	DOCKET NO 2013-0005-PWS-E; FINAL TR DUE DATE 01/30/2014; FILE CLOSED 4/30/2014
1064	562	SOX	State Compliance achieved	22-MAY-2013	State	REQUIREMENTS MET FOR RETURN TO COMPLIANCE
1045	544	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	547	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	548	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	549	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	550	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	551	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	552	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	553	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	554	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	555	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	556	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	557	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1044	558	SOX	State Compliance achieved	12-NOV-2012	State	Received samples from 1Q2010 through 3Q2012
1044	559	SOX	State Compliance achieved	12-NOV-2012	State	Received samples from 1Q2010 through 3Q2012
1044	560	SOX	State Compliance achieved	12-NOV-2012	State	Received samples from 1Q2010 through 3Q2012
1044	561	SOX	State Compliance achieved	12-NOV-2012	State	Received samples from 1Q2010 through 3Q2012
1045	543	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	542	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	541	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	540	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	539	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	538	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	537	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	545	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1045	546	SOX	State Compliance achieved	12-NOV-2012	State	Received VOC data for 2010 through 2012.
1036	515	SOX	State Compliance achieved	04-APR-2012	State	-
1037	521	SOX	State Compliance achieved	01-MAR-2012	State	-
1019	514	SOX	State Compliance achieved	01-APR-2011	State	AUTOMATIC RETURN TO COMPLIANCE 02/01/2011
1014	509	SOX	State Compliance achieved	09-AUG-2010	State	-

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All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
SW FROM CITY OF WESLACO	130229	Yes	Consecutive Connection	Surface water	Emergency	Active
1 - PLUGGED	18078	Yes	Well	Ground water	Permanent	Inactive
W2	18077	Yes	Well	Ground water	Permanent	Active
INTAKE 1 - MERCEDES ELEV CANAL	33601	Yes	Intake	Surface water	Permanent	Active
SW FROM NORTH ALAMO WSC	130230	Yes	Consecutive Connection	Surface water	Emergency	Active
RAW-TAP	117548	No	Common Headers	-	-	Active
PLANT - 1.2 MG - CW	123524	No	Clear Well	-	-	Active
PLANT - 0.18 MG - CW	123525	No	Clear Well	-	-	Active
PLANT - 0.086 MG - CW	123526	No	Clear Well	-	-	Active
DISTRIBUTION SYSTEM	42425	No	Distribution System/Zone	-	-	Active
PLANT SITE - 1500 GPM - SP	73651	No	Pump Facility	-	-	Active
PLANT SITE - 1500 GPM - SP	73652	No	Pump Facility	-	-	Active
PLANT SITE - 1300 GPM - SP	73653	No	Pump Facility	-	-	Active
PLANT SITE - 1000 GPM - SP	73654	No	Pump Facility	-	-	Active
PLANT SITE - 800 GPM - SP	123527	No	Pump Facility	-	-	Inactive
PLANT - 208 S ILLINOIS	137035	No	Sampling Station	-	-	Active
PLANT - 208 S ILLINOIS	54172	No	Sampling Station	-	-	Active
EP002	60488	No	Sampling Station	-	-	Inactive
NE OF CITY - 0.75 MG - EL	90518	No	Storage	-	-	Active
INDUSTRIAL PARK - 0.75 MG - EL	90519	No	Storage	-	-	Active
PLANT SITE	90520	No	Storage	-	-	Inactive
PLANT - WELL 2	65063	No	Treatment Plant	-	-	Active
SWTP - 2018 S ILLINOIS ST	8181	No	Treatment Plant	-	-	Active
CHLORINATOR	2403	No	Treatment Plant	-	-	Inactive

1 - 24 of 24

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
PLANT - WELL 2	65063	Gaseous Chlorination, Pre	Disinfection
SWTP - 2018 S ILLINOIS ST	8181	Gaseous Chlorination, Pre	Disinfection
SWTP - 2018 S ILLINOIS ST	8181	Innovative	Particulate removal
SWTP - 2018 S ILLINOIS ST	8181	Innovative	Particulate removal
SWTP - 2018 S ILLINOIS ST	8181	Sedimentation	Particulate removal
SWTP - 2018 S ILLINOIS ST	8181	Innovative	Particulate removal
SWTP - 2018 S ILLINOIS ST	8181	Innovative	Disinfection
SWTP - 2018 S ILLINOIS ST	8181	Innovative	Disinfection
SWTP - 2018 S ILLINOIS ST	8181	Innovative	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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