Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	HI0000331
PWS Name	HNL-WINDWARD-PEARL HARBOR
PWS Type	Community water system
Owner Type	Local government
Primary Source	Ground water
Primacy Type	State
Is Wholesaler?	No
Population Served	631389
County Served	Honolulu

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
MCL	Maximum Contaminant Level Violation, Acute (TCR)	Total Coliform Rule	Coliform (TCR)	8310330	Returned to Compliance	01-OCT-2013	31-OCT-2013	Yes
MR	Monitoring, Regular	Synthetic Organic Chemicals	ETHYLENE DIBROMIDE	8310329	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Inorganic Chemicals	Antimony, Total	8310296	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	1,2-DIBROMO-3-CHLOROPROPANE	8310328	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	8310323	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	8310322	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	8310321	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	8310320	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	8310319	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	8310318	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	8310317	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	8310316	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	8310315	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	8310314	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	8310313	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	8310312	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	8310311	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	8310310	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Vinyl chloride	8310309	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	8310308	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	8310307	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	DICHLOROMETHANE	8310306	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Xylenes, Total	8310305	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Inorganic Chemicals	Chromium	8310293	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	8310304	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	8310303	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Inorganic Chemicals	Selenium	8310299	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Nitrate Rule	Nitrite	8310302	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	8310301	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Inorganic Chemicals	Nickel	8310295	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Inorganic Chemicals	Mercury	8310294	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Inorganic Chemicals	Fluoride	8310300	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Inorganic Chemicals	Cadmium	8310292	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Inorganic Chemicals	Barium	8310291	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Arsenic Rule	Arsenic	8310290	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	LASSO	8310327	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Carbofuran	8310326	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	OXAMYL	8310325	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Glyphosate	8310324	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Inorganic Chemicals	Thallium, Total	8310298	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Inorganic Chemicals	Beryllium, Total	8310297	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Water Quality Parameter M/R	Lead and Copper Rule	Lead and Copper Rule	193	Returned to Compliance	01-JUL-1992	31-DEC-1992	No
MR	Water Quality Parameter M/R	Lead and Copper Rule	Lead and Copper Rule	V000193	Returned to Compliance	01-JUL-1992	31-DEC-1992	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
199	8310330	SOX	State Compliance achieved	19-OCT-2013	State	TCR Acute violation, 10/13, RTC
196	8310309	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310329	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310290	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310291	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310292	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310293	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310294	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310295	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310296	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310297	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310298	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310299	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310300	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310301	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310302	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310303	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310304	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310305	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310306	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310307	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310308	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310310	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310311	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310312	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310313	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310314	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310315	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310316	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310317	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310318	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310319	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310320	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310321	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310322	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310323	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310324	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310325	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310326	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310327	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
196	8310328	SOX	State Compliance achieved	31-JUL-2013	State	P2/P5 M/R, 08-10, RTC
E000193	V000193	EOX	Federal Compliance achieved	15-DEC-1993	ODSWeb	-
193	193	EOX	Federal Compliance achieved	15-DEC-1993	State	-

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All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
MAKIKI SPRING A	1012	Yes	Spring	Ground water	Permanent	Inactive
PUNALUU WELLS III PUMP 2	707	Yes	Well	Ground water	Permanent	Inactive
KAPALAMA WELLS PUMP 2	689	Yes	Well	Ground water	Permanent	Inactive
KAONOHI I PUMP 2	688	Yes	Well	Ground water	Permanent	Inactive
AIEA WELLS PUMP 1 (260)	673	Yes	Well	Ground water	Permanent	Inactive
WAIMANALO WELLS II	564	Yes	Well	Ground water	Permanent	Inactive
PUNALUU WELLS I	559	Yes	Well	Ground water	Permanent	Inactive
KAHANA WELL 1	545	Yes	Well	Ground water	Permanent	Inactive
WAIMANALO WELL III	1697	Yes	Well	Ground water	Permanent	Inactive
PALOLO TUNNEL	1609	Yes	Well	Ground water	Permanent	Inactive
KAONONI II P1	1283	Yes	Well	Ground water	Permanent	Inactive
KAONOHI II P3	1282	Yes	Well	Ground water	Permanent	Inactive
KALIHI WELL 3	1278	Yes	Well	Ground water	Permanent	Inactive
KALIHI WELL 8	1277	Yes	Well	Ground water	Permanent	Inactive
KALIHI WELL 7	1276	Yes	Well	Ground water	Permanent	Inactive
KALIHI WELL 5	1273	Yes	Well	Ground water	Permanent	Inactive
KALIHI WELL 4	1272	Yes	Well	Ground water	Permanent	Inactive
KALIHI WELL 2	1269	Yes	Well	Ground water	Permanent	Inactive
KALIHI PUMPING STATION WELLS	1268	Yes	Well	Ground water	Permanent	Inactive
HALAWA SHAFT	1257	Yes	Well	Ground water	Permanent	Inactive
JONATHAN SPRINGS	1256	Yes	Well	Ground water	Permanent	Inactive
KALIHI AERATOR WELL	1009	Yes	Well	Ground water	Permanent	Inactive
HALAWA WELL 3	1006	Yes	Well	Ground water	Permanent	Inactive
HALAWA WELL 2	1004	Yes	Well	Ground water	Permanent	Inactive
HALAWA WELL 1	1003	Yes	Well	Ground water	Permanent	Inactive
NUUANU TUNNEL IVB	1296	Yes	Well	Ground water under the influence of surface water	Permanent	Inactive
NUUANU TUNNEL IIIA	1294	Yes	Well	Ground water under the influence of surface water	Permanent	Inactive
NUUANU TUNNEL III	1293	Yes	Well	Ground water under the influence of surface water	Permanent	Inactive
NUUANU TUNNEL IV	1292	Yes	Well	Ground water under the influence of surface water	Permanent	Inactive
WILDER WELL 4	717	Yes	Well	Ground water	Permanent	Active
WILDER WELL 3	716	Yes	Well	Ground water	Permanent	Active
WILDER WELL 2	715	Yes	Well	Ground water	Permanent	Active
WAIAU WELL PUMP 3	714	Yes	Well	Ground water	Permanent	Active
WAIAU WELL PUMP 2	713	Yes	Well	Ground water	Permanent	Active
PUNANANI WELL PUMP 6	712	Yes	Well	Ground water	Permanent	Active
PUNANANI WELL PUMP 5	711	Yes	Well	Ground water	Permanent	Active
PUNANANI WELL PUMP 4	710	Yes	Well	Ground water	Permanent	Active
PUNANANI WELL PUMP 3	709	Yes	Well	Ground water	Permanent	Active
PUNANANI WELL PUMP 2	708	Yes	Well	Ground water	Permanent	Active
PUNALUU WELLS III PUMP 1	706	Yes	Well	Ground water	Permanent	Active
PUNALUU WELLS II PUMP 6	705	Yes	Well	Ground water	Permanent	Active
PUNALUU WELLS II PUMP 5	704	Yes	Well	Ground water	Permanent	Active
PUNALUU WELLS II PUMP 4	703	Yes	Well	Ground water	Permanent	Active
PUNALUU WELLS II PUMP 3	702	Yes	Well	Ground water	Permanent	Active
PUNALUU WELLS II PUMP 2	701	Yes	Well	Ground water	Permanent	Active
PUNALUU WELLS II PUMP 1	700	Yes	Well	Ground water	Permanent	Active
PEARL CITY III PALISADES	699	Yes	Well	Ground water	Permanent	Active
PEARL CITY WELLS II PUMP 3	698	Yes	Well	Ground water	Permanent	Active
PEARL CITY WELLS II PUMP 2	697	Yes	Well	Ground water	Permanent	Active
PEARL CITY WELLS II PUMP 1	696	Yes	Well	Ground water	Permanent	Active

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Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
PUNALUU II P4	1185	Gaseous Chlorination, Pre	Organics removal
BERETANIA PUMPING STATION CHLORINATOR	1194	Gaseous Chlorination, Pre	Organics removal
KAHALUU TUNNEL & WELL CHLORINATOR	1258	Gaseous Chlorination, Pre	Organics removal
KAHANA PUMP 2	1260	Gaseous Chlorination, Pre	Organics removal
KALIHI AERATOR WELL	1267	Gaseous Chlorination, Pre	Organics removal
KALIHI TP 2	1270	Gaseous Chlorination, Post	Disinfection
KALIHI TP 4	1271	Gaseous Chlorination, Pre	Organics removal
KALIHI TP 5	1274	Gaseous Chlorination, Pre	Organics removal
LULUKU TUNNEL AND WELL CHLORINATOR	1285	Gaseous Chlorination, Pre	Organics removal
MAKIKI SPRING A	1286	Gaseous Chlorination, Pre	Organics removal
MAKIKI SPRING B	1287	Gaseous Chlorination, Pre	Organics removal
NUUANU AERATOR UPPER A	1297	Gaseous Chlorination, Pre	Organics removal
NUUANU AERATOR LOWER B	1299	Gaseous Chlorination, Pre	Organics removal
NUUANU AERATOR UPPER B	1300	Gaseous Chlorination, Pre	Organics removal
NUUANU AERATOR LOWER A	1302	Gaseous Chlorination, Pre	Organics removal
PEARL CITY SHAFT CHLORINATOR	1304	Gaseous Chlorination, Pre	Organics removal
WAIMANALO TUNNEL III	1317	Gaseous Chlorination, Pre	Organics removal
WAIMANALO TUNNEL II	1318	Gaseous Chlorination, Pre	Organics removal
WAIMANALO TUNNEL I-IV CHLORINATOR	1319	Gaseous Chlorination, Pre	Organics removal
WAIMANALO TUNNEL IV	1320	Gaseous Chlorination, Pre	Organics removal
AIEA WELLS PUMP 1 & 2 (260) CHLORINATOR	1581	Chlorination (FRDS-1.5)	Disinfection
HALAWA WELLS CHLORINATOR - UNITS 1 & 2	1582	Chlorination (FRDS-1.5)	Disinfection
HAUULA WELL CHLORINATOR	1584	Chlorination (FRDS-1.5)	Disinfection
HECO WAIAU WELLS CHLORINATOR	1585	Chlorination (FRDS-1.5)	Disinfection
KAAHUMANU WELLS CHLORINATOR	1587	Chlorination (FRDS-1.5)	Disinfection
KAAMILO WELLS CHLORINATOR	1588	Chlorination (FRDS-1.5)	Disinfection
KAPALAMA WELLS CHLORINATOR	1591	Chlorination (FRDS-1.5)	Disinfection
KULIOUOU WELL CHLORINATOR	1592	Chlorination (FRDS-1.5)	Disinfection
KUOU WELLS I CHLORINATOR	1593	Chlorination (FRDS-1.5)	Disinfection
KUOU WELLS II CHLORINATOR	1594	Chlorination (FRDS-1.5)	Disinfection
MAAKUA WELL CHLORINATOR	1596	Chlorination (FRDS-1.5)	Disinfection
KAIMUKI PUMPING STATION CHLORINATOR	1597	Chlorination (FRDS-1.5)	Disinfection
HALAWA SHAFT CHLORINATOR	1598	Chlorination (FRDS-1.5)	Disinfection
AINA KOA WELLS 1 CHLORINATOR	1599	Chlorination (FRDS-1.5)	Disinfection
MANOA WELLS II CHLORINATOR	1604	Chlorination (FRDS-1.5)	Disinfection
MANANA WELL CHLORINATOR	1605	Chlorination (FRDS-1.5)	Disinfection
MOANALUA WELLS CHLORINATOR	1606	Chlorination (FRDS-1.5)	Disinfection
NEWTOWN WELLS CHLORINATOR	1607	Chlorination (FRDS-1.5)	Disinfection
PEARL CITY WELLS I CHLORINATOR	1610	Chlorination (FRDS-1.5)	Disinfection
PEARL CITY WELLS II CHLORINATOR	1611	Chlorination (FRDS-1.5)	Disinfection
PUNALUU WELLS I CHLORINATOR	1612	Chlorination (FRDS-1.5)	Disinfection
PUNALUU WELLS II CHLORINATOR	1613	Chlorination (FRDS-1.5)	Disinfection
WAIAU WELLS CHLORINATOR	1614	Chlorination (FRDS-1.5)	Disinfection
WAIHEE TUNN + INCLINED WELLS CHLORINATOR	1615	Chlorination (FRDS-1.5)	Disinfection
WAILUPE WELL CHLORINATOR	1616	Chlorination (FRDS-1.5)	Disinfection
WAIMANALO WELLS II CHLORINATOR	1617	Chlorination (FRDS-1.5)	Disinfection
KUOU WELLS III CHLORINATOR	1630	Chlorination (FRDS-1.5)	Disinfection
KALAUAO WELLS CHLORINATOR	1631	Chlorination (FRDS-1.5)	Disinfection
AINA KOA WELLS 2 CHLORINATOR	1726	Chlorination (FRDS-1.5)	Disinfection
KAHANA WELLS CHLORINATOR	1747	Chlorination (FRDS-1.5)	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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