Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	NM3500707
PWS Name	LA UNION MDS & WA
PWS Type	Community water system
Owner Type	Local government
Primary Source	Ground water
Primacy Type	State
Is Wholesaler?	No
Population Served	1177
County Served	Dona Ana

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	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	21243	Returned to Compliance	01-SEP-2024	30-SEP-2024	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21236	Returned to Compliance	01-OCT-2015	31-DEC-2015	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21237	Returned to Compliance	01-JUL-2015	30-SEP-2015	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21238	Returned to Compliance	01-APR-2015	30-JUN-2015	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21239	Returned to Compliance	01-JAN-2015	31-MAR-2015	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21234	Returned to Compliance	01-OCT-2014	31-DEC-2014	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21235	Returned to Compliance	01-JUL-2014	30-SEP-2014	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	21232	Returned to Compliance	24-APR-2014	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21233	Returned to Compliance	01-APR-2014	30-JUN-2014	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21231	Returned to Compliance	01-JAN-2014	31-MAR-2014	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21230	Returned to Compliance	01-OCT-2013	31-DEC-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21229	Returned to Compliance	01-JUL-2013	30-SEP-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21228	Returned to Compliance	01-APR-2013	30-JUN-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21226	Returned to Compliance	01-JAN-2013	31-MAR-2013	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	21240	Returned to Compliance	29-OCT-2012	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21227	Returned to Compliance	01-OCT-2012	31-DEC-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21225	Returned to Compliance	01-JUL-2012	30-SEP-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21224	Returned to Compliance	01-APR-2012	30-JUN-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21222	Returned to Compliance	01-JAN-2012	31-MAR-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21223	Returned to Compliance	01-OCT-2011	31-DEC-2011	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	21219	Returned to Compliance	07-JUL-2011	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21218	Returned to Compliance	01-JUL-2011	30-SEP-2011	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21217	Returned to Compliance	01-APR-2011	30-JUN-2011	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	21220	Returned to Compliance	24-FEB-2011	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21213	Returned to Compliance	01-JAN-2011	31-MAR-2011	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	21221	Returned to Compliance	29-NOV-2010	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21212	Returned to Compliance	01-OCT-2010	31-DEC-2010	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	21215	Returned to Compliance	23-JUL-2010	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21210	Returned to Compliance	01-JUL-2010	30-SEP-2010	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21208	Returned to Compliance	01-APR-2010	30-JUN-2010	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	21216	Returned to Compliance	15-MAR-2010	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21207	Returned to Compliance	01-JAN-2010	31-MAR-2010	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21206	Returned to Compliance	01-OCT-2009	31-DEC-2009	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	21211	Returned to Compliance	21-SEP-2009	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21204	Returned to Compliance	01-JUL-2009	30-SEP-2009	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	21209	Returned to Compliance	03-MAY-2009	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21214	Returned to Compliance	01-APR-2009	30-JUN-2009	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	21202	Returned to Compliance	01-JAN-2009	31-MAR-2009	Yes
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	7603	Returned to Compliance	01-NOV-2002	30-NOV-2002	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	21201	Returned to Compliance	01-JUN-2001	30-JUN-2001	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
58601	21243	SOX	State Compliance achieved	08-OCT-2025	State	-
58597	21216	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21239	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21238	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21237	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21236	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21235	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21234	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21233	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21231	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21202	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21204	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21206	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21207	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21208	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21210	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21211	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21212	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21213	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21214	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21217	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21218	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21222	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21223	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21224	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21225	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21226	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21227	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21228	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21229	SOX	State Compliance achieved	08-NOV-2016	State	-
58597	21230	SOX	State Compliance achieved	08-NOV-2016	State	-
58574	21219	SOX	State Compliance achieved	28-MAY-2014	State	-
58574	21221	SOX	State Compliance achieved	28-MAY-2014	State	-
58574	21220	SOX	State Compliance achieved	28-MAY-2014	State	-
58573	21232	SOX	State Compliance achieved	30-APR-2014	State	-
58598	21240	SOX	State Compliance achieved	31-OCT-2012	State	-
58526	7603	SOX	State Compliance achieved	17-DEC-2010	State	-
58526	21209	SOX	State Compliance achieved	17-DEC-2010	State	-
58526	21201	SOX	State Compliance achieved	17-DEC-2010	State	-
58536	21215	SOX	State Compliance achieved	12-JUN-2009	State	-

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All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
WELL #2	13886	Yes	Well	Ground water	Permanent	Active
WELL #1	1816	Yes	Well	Ground water	Permanent	Active
DIST	5197	No	Distribution System/Zone	-	-	Active
STORAGE TANK #2	14852	No	Storage	-	-	Active
STORAGE TANK #1	7944	No	Storage	-	-	Active
TREATMENT PLANT #1	1464	No	Treatment Plant	-	-	Active

1 - 6 of 6

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
TREATMENT PLANT #1	1464	Hypochlorination, Pre	Disinfection
TREATMENT PLANT #1	1464	pH Adjustment, Pre	Inorganics removal
TREATMENT PLANT #1	1464	Coagulation	Inorganics removal
TREATMENT PLANT #1	1464	Filtration, Pressure Sand	Inorganics 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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