Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	AZ0407095
PWS Name	MESA CITY OF
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	No
Population Served	466000
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
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	151817	Returned to Compliance	01-AUG-2025	31-AUG-2025	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Bromate	151815	Returned to Compliance	01-MAR-2025	31-MAR-2025	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Bromate	151816	Returned to Compliance	01-FEB-2025	28-FEB-2025	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) phthalate	151808	Returned to Compliance	01-JAN-2023	31-MAR-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	151729	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	151748	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	151747	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	151746	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	151745	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	151744	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	151743	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	151742	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	151741	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	151740	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	151739	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	151738	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	151737	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	151736	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Vinyl chloride	151735	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	151734	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	151733	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	DICHLOROMETHANE	151732	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Xylenes, Total	151731	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	151730	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	151749	Returned to Compliance	01-JAN-2023	31-DEC-2023	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	151581	Returned to Compliance	01-JAN-2021	31-MAR-2021	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorite	151545	Returned to Compliance	01-JUL-2020	31-JUL-2020	No
MR	Monitoring, Source Water (LT2)	Long Term 2 Enhanced Surface Water Treatment Rule	E. COLI	151490	Returned to Compliance	01-APR-2020	30-APR-2020	No
MR	Monitoring, Source Water (LT2)	Long Term 2 Enhanced Surface Water Treatment Rule	Cryptosporidium	151489	Returned to Compliance	01-APR-2020	30-APR-2020	No
MR	Monitoring, Source Water (LT2)	Long Term 2 Enhanced Surface Water Treatment Rule	Turbidity	151488	Returned to Compliance	01-APR-2020	30-APR-2020	No
MR	Monitoring, Turbidity (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	151429	Returned to Compliance	01-FEB-2020	29-FEB-2020	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	151432	Returned to Compliance	01-FEB-2020	29-FEB-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	151457	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	151484	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	151456	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	151483	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	151455	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	151482	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	151454	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	151481	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	151453	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	151480	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	151452	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	151479	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	151451	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	151450	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	151478	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	151449	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	151477	Returned to Compliance	01-JAN-2020	31-MAR-2020	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	151448	Returned to Compliance	01-JAN-2020	31-MAR-2020	No

1 - 50 of 1,578

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
84465	151817	SOX	State Compliance achieved	07-OCT-2025	State	-
84463	151815	SOX	State Compliance achieved	20-JUN-2025	State	April 2025 Bromate sampled and submitted on time.
84463	151816	SOX	State Compliance achieved	20-JUN-2025	State	April 2025 Bromate sampled and submitted on time.
84447	151808	SOX	State Compliance achieved	21-MAY-2024	State	-
84461	151731	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151732	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151733	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151734	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151735	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151736	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151737	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151738	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151739	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151740	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151741	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151742	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151743	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151744	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151745	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151746	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151747	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151748	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151749	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151729	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84461	151730	SOX	State Compliance achieved	18-APR-2024	State	following monitoring period (2024) VOC data at EPDS131 was submitted on 4/18/24
84418	151581	SIE	State Public Notification requested	20-MAY-2021	State	-
84406	151545	SIA	State Violation/Reminder Notice	09-DEC-2020	State	-
84403	151488	SOX	State Compliance achieved	13-JUL-2020	State	PWS submitted 07/13/2020 - TH5 07/30/2020
84403	151489	SOX	State Compliance achieved	13-JUL-2020	State	PWS submitted 07/13/2020 - TH5 07/30/2020
84403	151490	SOX	State Compliance achieved	13-JUL-2020	State	PWS submitted 07/13/2020 - TH5 07/30/2020
84396	151433	SOX	State Compliance achieved	28-MAY-2020	State	1Q2020 EPDS112 NITRATE RESULT SUBMITTED LATE ON 05/28/2020. CO3 06/29/2020
84385	151440	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151441	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151442	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151443	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151444	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151445	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151446	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151447	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151448	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151449	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151450	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151451	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151452	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151453	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151454	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151455	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151456	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151457	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-
84385	151458	SIA	State Violation/Reminder Notice	19-MAY-2020	State	-

1 - 50 of 1,555

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
CC001 - 07025	21399	Yes	Consecutive Connection	Surface water	Permanent	Active
XWL-55-575995 - DESERT WELL 11	8193	Yes	Well	Ground water	Permanent	Inactive
XWL-55-562864 - DESERT WELL 14	7513	Yes	Well	Ground water	Permanent	Inactive
XWL-55-602750 - DESERT 3	7313	Yes	Well	Ground water	Permanent	Inactive
XWL-55-505767 - DESERT WELL 10	6989	Yes	Well	Ground water	Permanent	Inactive
XWL-55-618439 - FALCON FIELD 16	6961	Yes	Well	Ground water	Permanent	Inactive
XWL-55-621101 - FALCON FIELD 11	6465	Yes	Well	Ground water	Permanent	Inactive
XWL-55-621105 - FALCON FIELD 10	6464	Yes	Well	Ground water	Permanent	Inactive
XWL-55-512235 - FALCON FIELD 8	6463	Yes	Well	Ground water	Permanent	Inactive
XWL-55-529939 - DESERT SAGE 13	6462	Yes	Well	Ground water	Permanent	Inactive
XWL-55-606285 - DESERT WELL 14	6461	Yes	Well	Ground water	Permanent	Inactive
XWL-55-625089 - DESERT WELL	6459	Yes	Well	Ground water	Permanent	Inactive
XWL-55-521659 - CITY WELL 23	6456	Yes	Well	Ground water	Permanent	Inactive
XWL-55-512354 - CITY WELL 21	6453	Yes	Well	Ground water	Permanent	Inactive
XWL-55-608949 - DESERT SAGE 12	6178	Yes	Well	Ground water	Permanent	Inactive
XWL-55-608948 - DESERT SAGE 11	6177	Yes	Well	Ground water	Permanent	Inactive
XWL-55-608946 -	6176	Yes	Well	Ground water	Permanent	Inactive
XWL-55-617847 - SRP ALMA SCHOOL	6175	Yes	Well	Ground water	Permanent	Inactive
XWL-55-608945 - DESERT SAGE 10	6174	Yes	Well	Ground water	Permanent	Inactive
XWL-55-629611 - FALCON FIELD 4	5442	Yes	Well	Ground water	Permanent	Inactive
XWL-55-629600 - CITY WELL 9	5437	Yes	Well	Ground water	Permanent	Inactive
XWL-55-629599 - CITY WELL 8	5435	Yes	Well	Ground water	Permanent	Inactive
XWL-55-629619 - CITY WELL 7	5421	Yes	Well	Ground water	Permanent	Inactive
XWL-55-629601 - CITY WELL 10	5418	Yes	Well	Ground water	Permanent	Inactive
XWL-55-629604 - CITY WELL 13	5417	Yes	Well	Ground water	Permanent	Inactive
XWL-55-629602 - CITY WELL 11	5415	Yes	Well	Ground water	Permanent	Inactive
XWL-55-629605 - CITY WELL 14	5414	Yes	Well	Ground water	Permanent	Inactive
XWL-55-629609 - FF2 - GOLF COURSE WELL	4228	Yes	Well	Ground water	Permanent	Inactive
XWL-55-629603 - CITY WELL 12	4227	Yes	Well	Ground water	Permanent	Inactive
XWL-2459 - DESERT SAGE 6	3032	Yes	Well	Ground water	Permanent	Inactive
XWL-55-219107 - DESERT WELL 20	25222	Yes	Well	Ground water	Permanent	Inactive
XWL-55-217041 - DESERT WELL 18	20717	Yes	Well	Ground water	Permanent	Inactive
XWL-55-583887 - DESERT SAGE 9	19513	Yes	Well	Ground water	Permanent	Inactive
XWL-55-575993 - FALCON FIELD 15	19030	Yes	Well	Ground water	Permanent	Inactive
WL-55-629616 - FALCON FIELD 14	7685	Yes	Well	Ground water	Permanent	Active
WL-55-564333 - DESERT WELL 15	7512	Yes	Well	Ground water	Permanent	Active
WL-55-553992 - CITY WELL 26	7492	Yes	Well	Ground water	Permanent	Active
WL-55-560667 - DESERT WELL 13	7478	Yes	Well	Ground water	Permanent	Active
WL-55-546718 - CITY WELL 25	7374	Yes	Well	Ground water	Permanent	Active
WL-55-511595 - DESERT WELL 9	6460	Yes	Well	Ground water	Permanent	Active
WL-55-629614 - DESERT WELL 6	6458	Yes	Well	Ground water	Permanent	Active
WL-55-523556 - CITY WELL 24	6457	Yes	Well	Ground water	Permanent	Active
WL-55-517843 - CITY WELL 22	6455	Yes	Well	Ground water	Permanent	Active
WL-55-629606 - CITY WELL 15	6454	Yes	Well	Ground water	Permanent	Active
WL-55-508798 - CITY WELL 20	6452	Yes	Well	Ground water	Permanent	Active
WL-55-629618 - CITY WELL 19	5443	Yes	Well	Ground water	Permanent	Active
WL-55-629608 - CITY WELL 18	5434	Yes	Well	Ground water	Permanent	Active
WL-55-629612 - FALCON FIELD 5	5433	Yes	Well	Ground water	Permanent	Active
WL-55-629607 - CITY WELL 16	5419	Yes	Well	Ground water	Permanent	Active
WL-55-629615 - DESERT WELL 7	5408	Yes	Well	Ground water	Permanent	Active

1 - 50 of 130

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
TP004 - CL2, AS	15746	Gaseous Chlorination, Pre	Disinfection
TP004 - CL2, AS	15746	Innovative	Inorganics removal
TP003 - CL2	15747	Gaseous Chlorination, Pre	Disinfection
TP002 - VAL VISTA	15785	Gaseous Chlorination, Pre	Disinfection
XTP215 - AS & NO3	20199	Ion Exchange	Inorganics removal
TP322 - CL2	22799	Gaseous Chlorination, Pre	Disinfection
TP003 - SIGNAL BUTTE	25055	Filtration, Pressure Sand	Disinfection by-products control
TP003 - SIGNAL BUTTE	25055	Hypochlorination, Post	Disinfection
TP003 - SIGNAL BUTTE	25055	Ozonation, Pre	Disinfection
TP003 - SIGNAL BUTTE	25055	Coagulation	Inorganics removal
TP003 - SIGNAL BUTTE	25055	Filtered	Inorganics removal
TP003 - SIGNAL BUTTE	25055	Filtration, Rapid Sand	Particulate removal
TP003 - SIGNAL BUTTE	25055	Coagulation	Particulate removal
TP003 - SIGNAL BUTTE	25055	Filtered	Particulate removal
TP003 - SIGNAL BUTTE	25055	Sedimentation	Particulate removal
TP001 - CLO2, BROWN CAP	949	Rapid Mix	Particulate removal
TP001 - CLO2, BROWN CAP	949	Filtration, Cartridge	Particulate removal
TP001 - CLO2, BROWN CAP	949	Gaseous Chlorination, Pre	Disinfection
TP001 - CLO2, BROWN CAP	949	Chlorine Dioxide	Disinfection
TP001 - CLO2, BROWN CAP	949	Coagulation	Particulate removal
TP001 - CLO2, BROWN CAP	949	Flocculation	Particulate removal
TP001 - CLO2, BROWN CAP	949	Sedimentation	Particulate removal
TP001 - CLO2, BROWN CAP	949	Fluoridation	Other

1 - 23 of 23

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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