Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	AZ0407523
PWS Name	DESERT OASIS
PWS Type	Community water system
Owner Type	Local government
Primary Source	Ground water
Primacy Type	State
Is Wholesaler?	No
Population Served	23963
County Served	Maricopa

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, Regular	Arsenic Rule	Arsenic	1540	Returned to Compliance	01-JUL-2020	30-SEP-2020	No
MR	Monitoring, Regular	Arsenic Rule	Arsenic	1538	Returned to Compliance	01-APR-2020	30-JUN-2020	No
MR	Monitoring, Regular	Arsenic Rule	Arsenic	1539	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Arsenic Rule	Arsenic	1543	Returned to Compliance	01-OCT-2019	31-DEC-2019	No
MR	Monitoring, Regular	Arsenic Rule	Arsenic	1542	Returned to Compliance	01-OCT-2019	31-DEC-2019	No
MR	Lead Consumer Notice	Lead and Copper Rule	Lead and Copper Rule	1537	Returned to Compliance	01-JAN-2019	-	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	1536	Returned to Compliance	01-JUL-2017	30-SEP-2017	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	1508	Returned to Compliance	01-FEB-2015	28-FEB-2015	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	1484	Returned to Compliance	01-OCT-2014	31-DEC-2014	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	1507	Returned to Compliance	01-APR-2014	30-JUN-2014	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	1483	Returned to Compliance	01-JUL-2012	30-SEP-2012	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	1463	Returned to Compliance	01-OCT-2010	31-DEC-2010	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	1431	Returned to Compliance	01-SEP-2010	30-SEP-2010	No
MR	Monitoring, Regular	Arsenic Rule	Arsenic	1432	Returned to Compliance	01-JUL-2010	30-SEP-2010	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	1430	Returned to Compliance	01-JUN-2010	30-JUN-2010	No
MR	Monitoring, Regular	Arsenic Rule	Arsenic	1429	Returned to Compliance	01-OCT-2009	31-DEC-2009	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	1426	Returned to Compliance	01-JUL-2009	30-SEP-2009	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	1436	Returned to Compliance	01-JUL-2009	-	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	1418	Returned to Compliance	01-OCT-2007	31-OCT-2007	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	1414	Returned to Compliance	01-SEP-2007	30-SEP-2007	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	1413	Returned to Compliance	01-AUG-2007	31-AUG-2007	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	1435	Returned to Compliance	01-JUL-2007	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	1434	Returned to Compliance	01-JUL-2006	-	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	606	Returned to Compliance	01-SEP-2005	30-SEP-2005	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	1406	Returned to Compliance	01-AUG-2005	31-AUG-2005	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	1306	Returned to Compliance	01-JUL-2005	31-JUL-2005	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	1206	Returned to Compliance	01-JUN-2005	30-JUN-2005	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	1106	Returned to Compliance	01-MAY-2005	31-MAY-2005	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	1006	Returned to Compliance	01-APR-2005	30-APR-2005	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	906	Returned to Compliance	01-MAR-2005	31-MAR-2005	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	806	Returned to Compliance	01-FEB-2005	28-FEB-2005	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	706	Returned to Compliance	01-JAN-2005	31-JAN-2005	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	1420	Returned to Compliance	01-JAN-2004	31-DEC-2007	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	1422	Returned to Compliance	01-JAN-2004	31-DEC-2007	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Radium-226	1421	Returned to Compliance	01-JAN-2004	31-DEC-2007	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	404	Returned to Compliance	01-JAN-2004	31-JAN-2004	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Uranium	1423	Returned to Compliance	01-JAN-2004	31-DEC-2007	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	304	Returned to Compliance	01-DEC-2003	31-DEC-2003	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	504	Returned to Compliance	01-NOV-2003	30-NOV-2003	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	204	Returned to Compliance	01-OCT-2003	31-OCT-2003	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
68	1542	SOX	State Compliance achieved	14-FEB-2024	State	-
68	1543	SOX	State Compliance achieved	14-FEB-2024	State	-
55	1538	SIA	State Violation/Reminder Notice	18-FEB-2021	State	-
57	1539	SIA	State Violation/Reminder Notice	18-FEB-2021	State	-
53	1540	SIA	State Violation/Reminder Notice	18-FEB-2021	State	-
48	1537	SIA	State Violation/Reminder Notice	23-JAN-2019	State	-
47	1536	SOX	State Compliance achieved	09-NOV-2017	State	PWS submitted the corrected forms for the 3Q17 on 11/9/17. DML 11/14/17
44	1508	SOX	State Compliance achieved	23-APR-2015	State	-
40	1484	SIA	State Violation/Reminder Notice	06-FEB-2015	State	-
43	1507	SOX	State Compliance achieved	04-AUG-2014	State	-
38	1483	SOX	State Compliance achieved	11-JAN-2013	State	-
22	1463	SOX	State Compliance achieved	01-FEB-2011	State	-
30	1431	SOX	State Compliance achieved	29-NOV-2010	State	-
29	1432	SOX	State Compliance achieved	18-NOV-2010	State	-
26	1430	SOX	State Compliance achieved	05-AUG-2010	State	-
23	1429	SOX	State Compliance achieved	05-MAR-2010	State	-
24	1426	SOX	State Compliance achieved	11-JAN-2010	State	-
37	1436	SOX	State Compliance achieved	15-JUL-2009	State	-
18	1423	SOX	State Compliance achieved	06-FEB-2009	State	-
17	1422	SOX	State Compliance achieved	12-MAR-2008	State	-
17	1420	SOX	State Compliance achieved	12-MAR-2008	State	-
17	1421	SOX	State Compliance achieved	12-MAR-2008	State	-
16	1414	SOX	State Compliance achieved	25-FEB-2008	State	-
16	1413	SOX	State Compliance achieved	25-FEB-2008	State	-
16	1418	SOX	State Compliance achieved	25-FEB-2008	State	-
36	1435	SOX	State Compliance achieved	31-DEC-2007	State	-
35	1434	SOX	State Compliance achieved	31-DEC-2006	State	-
32	1206	SOX	State Compliance achieved	16-JUN-2006	State	-
32	1106	SOX	State Compliance achieved	16-JUN-2006	State	-
32	1006	SOX	State Compliance achieved	16-JUN-2006	State	-
32	1306	SOX	State Compliance achieved	16-JUN-2006	State	-
32	1406	SOX	State Compliance achieved	16-JUN-2006	State	-
32	906	SOX	State Compliance achieved	16-JUN-2006	State	-
32	606	SOX	State Compliance achieved	16-JUN-2006	State	-
32	706	SOX	State Compliance achieved	16-JUN-2006	State	-
32	806	SOX	State Compliance achieved	16-JUN-2006	State	-
33	304	SOX	State Compliance achieved	12-AUG-2004	State	-
33	404	SOX	State Compliance achieved	12-AUG-2004	State	-
33	504	SOX	State Compliance achieved	12-AUG-2004	State	-
33	204	SOX	State Compliance achieved	12-AUG-2004	State	-

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All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
CC001 - 07500	23648	Yes	Consecutive Connection	Ground water	Permanent	Active
WL-55-593635	8297	Yes	Well	Ground water	Permanent	Active
WL-55-217031 - RANCHO MERCADO #1	25644	Yes	Well	Ground water	Permanent	Active
WL-55-593634	15579	Yes	Well	Ground water	Permanent	Active
DISTRIBUTION SYSTEM	13500	No	Distribution System/Zone	-	-	Active
EPDS002	25646	No	Sampling Station	-	-	Active
EPDS001	9499	No	Sampling Station	-	-	Active
XEPHIS	18615	No	Sampling Station	-	-	Inactive
ST001 - 1,750,000	25992	No	Storage	-	-	Active
ST002 - 2,000,000	25993	No	Storage	-	-	Active
ST003 - 1,500,000	25994	No	Storage	-	-	Active
TP001 - CL2, AS	17307	No	Treatment Plant	-	-	Active
TP002 - AS	25645	No	Treatment Plant	-	-	Active

1 - 13 of 13

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
TP001 - CL2, AS	17307	Hypochlorination, Post	Disinfection
TP001 - CL2, AS	17307	Ion Exchange	Inorganics removal
TP002 - AS	25645	Innovative	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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