Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	NV0000090
PWS Name	LAS VEGAS VALLEY WATER DISTRICT
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water purchased
Primacy Type	State
Is Wholesaler?	No
Population Served	1539277
County Served	Clark

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	Synthetic Organic Chemicals	ETHYLENE DIBROMIDE	119276	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	1,2-DIBROMO-3-CHLOROPROPANE	119305	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	ETHYLENE DIBROMIDE	119306	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Endrin	119279	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	BHC-GAMMA	119280	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Methoxychlor	119281	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Toxaphene	119282	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Dalapon	119283	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Diquat	119284	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Endothall	119285	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Glyphosate	119286	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) adipate	119287	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	OXAMYL	119288	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Simazine	119289	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) phthalate	119290	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Picloram	119291	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Dinoseb	119292	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Chlordane	119307	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Pentachlorophenol	119303	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Benzo(a)pyrene	119302	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	HEXACHLOROBENZENE	119301	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	2,4,5-TP	119300	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	2,4-D	119299	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	2,4-D	119275	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Total Polychlorinated Biphenyls (PCB)	119304	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Heptachlor epoxide	119298	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Heptachlor	119297	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	2,3,7,8-TCDD	119277	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	2,3,7,8-TCDD	119278	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	LASSO	119296	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Atrazine	119295	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Carbofuran	119294	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Hexachlorocyclopentadiene	119293	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) phthalate	119220	Returned to Compliance	01-JUL-2010	30-SEP-2010	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) phthalate	119221	Returned to Compliance	01-APR-2010	30-JUN-2010	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) phthalate	119222	Returned to Compliance	01-APR-2010	30-JUN-2010	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) phthalate	119223	Returned to Compliance	01-APR-2010	30-JUN-2010	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) phthalate	119218	Returned to Compliance	01-APR-2010	30-JUN-2010	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) phthalate	119219	Returned to Compliance	01-APR-2009	30-JUN-2009	No
MR	Monitoring, Regular	Inorganic Chemicals	Mercury	119217	Returned to Compliance	01-JAN-2005	31-DEC-2007	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	117103	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	117303	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	117003	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	117403	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	117603	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	117703	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	116503	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	117203	Returned to Compliance	01-JAN-2002	31-DEC-2002	No
MR	Monitoring, Repeat Major (TCR)	Total Coliform Rule	Coliform (TCR)	192	Known	01-JUL-1992	31-JUL-1992	No

1 - 49 of 49

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
3936	119305	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119300	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119303	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119302	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119301	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119306	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119307	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119275	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119276	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119277	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119278	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119279	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119280	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119281	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119282	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119283	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119284	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119285	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119286	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119287	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119288	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119289	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119290	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119291	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119292	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119293	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119294	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119295	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119296	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119297	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119298	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119299	SIF	State Public Notification received	18-FEB-2021	State	-
3936	119304	SIF	State Public Notification received	18-FEB-2021	State	-
3921	119223	SIF	State Public Notification received	05-JUL-2012	State	PUBLIC NOTICE OCCURRED IN 2012 VIA 2011 CY CCR
3921	119222	SIF	State Public Notification received	05-JUL-2012	State	PUBLIC NOTICE OCCURRED IN 2012 VIA 2011 CY CCR
3921	119221	SIF	State Public Notification received	05-JUL-2012	State	PUBLIC NOTICE OCCURRED IN 2012 VIA 2011 CY CCR
3921	119220	SIF	State Public Notification received	05-JUL-2012	State	PUBLIC NOTICE OCCURRED IN 2012 VIA 2011 CY CCR
3921	119219	SIF	State Public Notification received	05-JUL-2012	State	PUBLIC NOTICE OCCURRED IN 2012 VIA 2011 CY CCR
3921	119218	SIF	State Public Notification received	05-JUL-2012	State	PUBLIC NOTICE OCCURRED IN 2012 VIA 2011 CY CCR
3907	119217	SIA	State Violation/Reminder Notice	10-SEP-2009	State	-
3104	117003	SOX	State Compliance achieved	02-JAN-2004	State	-
3104	117103	SOX	State Compliance achieved	02-JAN-2004	State	-
3104	117703	SOX	State Compliance achieved	02-JAN-2004	State	-
3104	117303	SOX	State Compliance achieved	02-JAN-2004	State	-
3104	117403	SOX	State Compliance achieved	02-JAN-2004	State	-
3104	117603	SOX	State Compliance achieved	02-JAN-2004	State	-
3104	116503	SOX	State Compliance achieved	02-JAN-2004	State	-
3104	117203	SOX	State Compliance achieved	02-JAN-2004	State	-

1 - 48 of 48

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
CC FROM AMS TP AT SNWS NV0000289	10	Yes	Consecutive Connection	Surface water	Permanent	Active
WELL 10 ABANDONED	3849	Yes	Well	Ground water	Seasonal	Inactive
WELL AR 93	6672	Yes	Well	Ground water	Permanent	Inactive
MOAPA MX-5 WELL	6484	Yes	Well	Ground water	Permanent	Inactive
WELL 71 RECHARGE	3858	Yes	Well	Ground water	Permanent	Inactive
WELL 70 RECHARGE	3857	Yes	Well	Ground water	Permanent	Inactive
WELL 121	3854	Yes	Well	Ground water	Permanent	Inactive
WELL 120	3853	Yes	Well	Ground water	Permanent	Inactive
WELL 119	3851	Yes	Well	Ground water	Permanent	Inactive
WELL 118	3850	Yes	Well	Ground water	Permanent	Inactive
WELL 27 CHARLESTON HTS 2168 ZONE	3405	Yes	Well	Ground water	Permanent	Inactive
WELL 26 CHARLESTON HTS 2168 ZONE	3404	Yes	Well	Ground water	Permanent	Inactive
WELL 79 CHARLESTON HTS 2168 ZONE	3397	Yes	Well	Ground water	Permanent	Inactive
WELL AR 29 GOWAN	3380	Yes	Well	Ground water	Permanent	Inactive
WELL 52 SMOKE 2420 ZONE	3379	Yes	Well	Ground water	Permanent	Inactive
WELL 104 2538 ZONE	3367	Yes	Well	Ground water	Permanent	Inactive
WELL 51 SMOKE 2420 ZONE	3365	Yes	Well	Ground water	Permanent	Inactive
WELL 38 2538 ZONE DISABLED	3256	Yes	Well	Ground water	Permanent	Inactive
WELL 29A GOWAN 2420 ZONE	9108	Yes	Well	Ground water	Permanent	Active
WELL 75 2538 ZONE	4043	Yes	Well	Ground water	Permanent	Active
WELL 74 2538 ZONE	3859	Yes	Well	Ground water	Permanent	Active
WELL 84 CHARLESTON HTS 2168 ZONE	3856	Yes	Well	Ground water	Permanent	Active
WELL 83 CHARLESTON HTS 2168 ZONE	3855	Yes	Well	Ground water	Permanent	Active
WELL 96 GRAND CANYON 2635 ZONE	3848	Yes	Well	Ground water	Permanent	Active
WELL 97 2635 ZONE	3847	Yes	Well	Ground water	Permanent	Active
WELL 86 RICE 2420 ZONE	3846	Yes	Well	Ground water	Permanent	Active
WELL 90 2635 ZONE	3711	Yes	Well	Ground water	Permanent	Active
WELL 117 2538 ZONE	3417	Yes	Well	Ground water	Permanent	Active
WELL 114 2635 ZONE	3416	Yes	Well	Ground water	Permanent	Active
WELL 113 2635 ZONE	3415	Yes	Well	Ground water	Permanent	Active
WELL 112 2635 ZONE	3414	Yes	Well	Ground water	Permanent	Active
WELL 110 2635 ZONE.	3413	Yes	Well	Ground water	Permanent	Active
WELL 105 2538 ZONE	3412	Yes	Well	Ground water	Permanent	Active
WELL 103 2538 ZONE	3411	Yes	Well	Ground water	Permanent	Active
WELL 98 2635 ZONE	3410	Yes	Well	Ground water	Permanent	Active
WELL 88 2538 ZONE	3409	Yes	Well	Ground water	Permanent	Active
WELL 80 CHARLESTON HTS 2168 ZONE	3408	Yes	Well	Ground water	Permanent	Active
WELL 78 2635 ZONE	3407	Yes	Well	Ground water	Permanent	Active
WELL 34 CHARLESTON HTS 2168 ZONE	3406	Yes	Well	Ground water	Permanent	Active
WELL 18A 2538 ZONE	3403	Yes	Well	Ground water	Permanent	Active
WELL 16 CHARLESTON HTS 2168 ZONE	3402	Yes	Well	Ground water	Permanent	Active
WELL 13 CHARLESTON HTS 2168 ZONE	3401	Yes	Well	Ground water	Permanent	Active
WELL 5A 2538 ZONE	3400	Yes	Well	Ground water	Permanent	Active
WELL 2A 2538 ZONE	3399	Yes	Well	Ground water	Permanent	Active
WELL 1A 2538 ZONE	3398	Yes	Well	Ground water	Permanent	Active
WELL 14 CHARLESTON HTS 2168 ZONE	3384	Yes	Well	Ground water	Permanent	Active
WELL 72 2538 ZONE	3383	Yes	Well	Ground water	Permanent	Active
WELL 69 2538 ZONE	3382	Yes	Well	Ground water	Permanent	Active
WELL 33 GOWAN 2420 ZONE	3381	Yes	Well	Ground water	Permanent	Active
WELL 45 2300 ZONE	3378	Yes	Well	Ground water	Permanent	Active

1 - 50 of 354

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
TP RED ROCK NORTH 4125 ZONE AERATOR ST90	10020	Aeration, Spray	Disinfection by-products control
TP RED ROCK NORTH 4125 ZONE CHLORINATOR	10021	Hypochlorination, Post	Disinfection
TP SUMMERLIN 3665 ZONE AERATOR ST89	10023	Hypochlorination, Post	Disinfection
TP CENTENNIAL 2635 ZONE CHLORINATOR	10025	Hypochlorination, Post	Disinfection
TP CENTENNIAL 2635 ZONE AERATOR ST92	10026	Aeration, Spray	Disinfection by-products control
W28 UV LED WELL 97	10169	Ultraviolet Radiation	Disinfection
W51 UV HG WELL 101	10204	Ultraviolet Radiation	Disinfection by-products control
TP ELKHORN 2975 ZONE SOUTH AERATOR ST84	10328	Aeration, Spray	Disinfection by-products control
TP ELKHORN 2975 ZONE NORTH AERATOR ST83	10329	Aeration, Spray	Disinfection by-products control
TP ANASAZI 2975 ZONE AERATION ST23	10331	Aeration, Spray	Disinfection by-products control
TP BELTWAY 3090 ZONE AERATOR ST25	10332	Aeration, Spray	Disinfection by-products control
TP CACTUS ZONE 2538 NORTH AERATOR ST77	10339	Aeration, Spray	Disinfection by-products control
TP CACTUS ZONE 2538 SOUTH AERATOR ST78	10340	Aeration, Spray	Disinfection by-products control
TP COUGAR 3090 ZONE N BASIN AERATOR ST93	10420	Aeration, Spray	Disinfection by-products control
TP COUGAR 3090 ZONE S BASIN AERATOR ST93	10421	Aeration, Spray	Disinfection by-products control
CHLORINATOR FOR CC FROM AMS TP	207	Hypochlorination, Pre	Disinfection
WELL 7A CHLORINATOR	5057	Hypochlorination, Post	Disinfection
WELL 68 CHLORINATOR W02	5058	Hypochlorination, Post	Disinfection
WELL 81 CHLORINATOR	5059	Hypochlorination, Post	Disinfection
WELL 82 CHLORINATOR	5060	Hypochlorination, Post	Disinfection
WELL 83 CHLORINATOR W05	5061	Hypochlorination, Post	Disinfection
WELL 84 CHLORINATOR W06	5062	Hypochlorination, Post	Disinfection
WELL 13 CHLORINATOR	5063	Hypochlorination, Post	Disinfection
WELL 15A CHLORINATOR W08	5064	Hypochlorination, Post	Disinfection
WELL 34 CHLORINATOR	5065	Hypochlorination, Post	Disinfection
WELL 79 CHLORINATOR	5066	Hypochlorination, Post	Disinfection
WELL 80 CHLORINATOR	5067	Hypochlorination, Post	Disinfection
WELL 14 CHLORINATOR W12	5068	Hypochlorination, Post	Disinfection
WELL 16 CHLORINATOR W13	5069	Hypochlorination, Post	Disinfection
WELL 17 CHLORINATOR W14	5070	Hypochlorination, Post	Disinfection
WELL 26 CHLORINATOR W15	5071	Hypochlorination, Post	Disinfection
WELL 27 CHLORINATOR W16	5072	Hypochlorination, Post	Disinfection
WELL 1A CHLORINATOR W17	5073	Hypochlorination, Post	Disinfection
WELL 24 CHLORINATOR W18	5074	Hypochlorination, Post	Disinfection
WELL 89 CHLORINATOR W20	5075	Hypochlorination, Post	Disinfection
WELL 86 CHLORINATOR W23	5076	Hypochlorination, Post	Disinfection
WELL 104 CHLORINATOR W24	5077	Hypochlorination, Post	Disinfection
WELL 76 CHLORINATOR W25	5078	Hypochlorination, Post	Disinfection
WELL 87 CHLORINATOR W26	5079	Hypochlorination, Post	Disinfection
WELL 93 CHLORINATOR W27	5080	Hypochlorination, Post	Disinfection
WELL 105 CHLORINATOR W29	5081	Hypochlorination, Post	Disinfection
WELL 97 CHLORINATOR W28	5082	Hypochlorination, Post	Disinfection
WELL 2A CHLORINATOR W30	5083	Hypochlorination, Post	Disinfection
WELL 5A CHLORINATOR W31	5084	Hypochlorination, Post	Disinfection
WELL 77 CHLORINATOR W33	5085	Hypochlorination, Post	Disinfection
WELL 18A CHLORINATOR W32	5086	Hypochlorination, Post	Disinfection
WELL 85 CHLORINATOR	5087	Hypochlorination, Post	Disinfection
WELL 45 CHLORINATOR W35	5088	Hypochlorination, Post	Disinfection
WELL 51 CHLORINATOR W36	5089	Hypochlorination, Post	Disinfection
WELL 52 CHLORINATOR W37	5090	Hypochlorination, Post	Disinfection

1 - 50 of 125

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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