Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	OH1801212
PWS Name	CLEVELAND PUBLIC WATER SYSTEM
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	No
Population Served	1308955
County Served	Cuyahoga

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	Water Quality Parameter M/R	Lead and Copper Rule	Lead and Copper Rule	5175132	Returned to Compliance	01-JAN-2024	30-JUN-2024	No
MR	Monitoring, Turbidity (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	5175120	Returned to Compliance	01-JUL-2017	31-JUL-2017	No
MR	Monitoring, Turbidity (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	5175121	Returned to Compliance	01-JUN-2017	30-JUN-2017	No
MR	Monitoring, Turbidity (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	5175119	Returned to Compliance	01-MAY-2017	31-MAY-2017	No
MR	Monitoring, Turbidity (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	5175118	Returned to Compliance	01-APR-2017	30-APR-2017	No
MR	Monitoring, Turbidity (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	5175117	Returned to Compliance	01-MAR-2017	31-MAR-2017	No
MR	Failure Submit Filter Profile/CPE Report	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	5175122	Known	01-FEB-2017	28-FEB-2017	No
MR	Monitoring, Turbidity (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	5175116	Returned to Compliance	01-FEB-2017	28-FEB-2017	No
MR	Monitoring, Turbidity (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	5175115	Returned to Compliance	01-DEC-2016	31-DEC-2016	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	5175114	Returned to Compliance	01-JUL-2014	31-JUL-2014	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	5175113	Returned to Compliance	01-JUN-2014	30-JUN-2014	No
MR	Monitoring, Turbidity (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	5175112	Returned to Compliance	01-AUG-2013	31-AUG-2013	No
MR	Monitoring, Turbidity (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	5175111	Returned to Compliance	01-AUG-2012	31-AUG-2012	No
TT	WQP Entry Point/Tap Treatment Technique Non-Compliance	Lead and Copper Rule	Lead and Copper Rule	5175109	Returned to Compliance	01-JUL-2009	31-DEC-2009	Yes
MR	Monitoring, Regular	Inorganic Chemicals	CYANIDE	5174102	Returned to Compliance	01-JAN-2002	30-JUN-2002	No
MR	Monitoring, Regular	Arsenic Rule	Arsenic	1033598	Returned to Compliance	01-JAN-1998	30-JUN-1998	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Carbofuran	1035894	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Aldicarb	1035994	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Atrazine	1036094	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	LASSO	1036194	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Heptachlor	1036294	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Heptachlor epoxide	1036494	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Total Polychlorinated Biphenyls (PCB)	1037494	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Aldicarb sulfone	1035694	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	2,4-D	1036894	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	2,4,5-TP	1036994	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Aldicarb sulfoxide	1035594	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Hexachlorocyclopentadiene	1035494	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Dinoseb	1035394	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Picloram	1035294	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) phthalate	1035194	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Simazine	1035094	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	OXAMYL	1034994	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) adipate	1034894	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Endothall	1034794	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Diquat	1034694	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Dalapon	1034594	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Toxaphene	1034294	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Methoxychlor	1034194	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	BHC-GAMMA	1034094	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Endrin	1033994	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Chlordane	1037794	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Pentachlorophenol	1037294	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Benzo(a)pyrene	1037194	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	HEXACHLOROBENZENE	1037094	Returned to Compliance	01-MAY-1994	31-JUL-1994	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	1033893	Returned to Compliance	01-SEP-1993	30-SEP-1993	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	1033793	Returned to Compliance	01-AUG-1993	31-AUG-1993	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	1033693	Returned to Compliance	01-JUL-1993	31-JUL-1993	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
2092985	5175132	SIF	State Public Notification received	19-MAY-2025	State	-
2092930	5175116	SIE	State Public Notification requested	18-JUN-2018	State	-
2092934	5175117	SIE	State Public Notification requested	18-JUN-2018	State	-
2092937	5175118	SIE	State Public Notification requested	18-JUN-2018	State	-
2092944	5175120	SIE	State Public Notification requested	18-JUN-2018	State	-
2092947	5175121	SIE	State Public Notification requested	18-JUN-2018	State	-
2092950	5175122	SIE	State Public Notification requested	18-JUN-2018	State	-
2092928	5175115	SIE	State Public Notification requested	18-JUN-2018	State	-
2092940	5175119	SIE	State Public Notification requested	18-JUN-2018	State	-
2092926	5175113	SOX	State Compliance achieved	11-FEB-2015	State	THIS WAS SOXed BY AN AUTOMATED PROCESS CREATED BY TAB.
2092926	5175114	SOX	State Compliance achieved	11-FEB-2015	State	THIS WAS SOXed BY AN AUTOMATED PROCESS CREATED BY TAB.
2092925	5175112	SIF	State Public Notification received	01-JUL-2014	State	-
2092924	5175111	SIF	State Public Notification received	01-JUL-2013	State	-
2092912	5175109	SOX	State Compliance achieved	30-MAR-2011	State	-
2092808	1033893	SOX	State Compliance achieved	07-FEB-2008	State	-
2092808	1033793	SOX	State Compliance achieved	07-FEB-2008	State	-
2092808	1033693	SOX	State Compliance achieved	07-FEB-2008	State	-
2092602	5174102	SIF	State Public Notification received	26-SEP-2002	State	-
1499	1033598	SIF	State Public Notification received	10-DEC-1998	State	-
4095	1035294	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1035394	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1035494	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1035594	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1035694	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1035894	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1035994	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1036094	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1036194	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1036294	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1036494	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1036894	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1036994	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1037094	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1037194	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1037294	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1037494	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1037794	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1033994	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1034194	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1035194	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1035094	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1034994	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1034894	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1034794	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1034694	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1034094	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1034294	SIF	State Public Notification received	25-NOV-1994	State	-
4095	1034594	SIF	State Public Notification received	25-NOV-1994	State	-

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All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
IN FROM CLEVELAND CITY BALDWIN	21546	Yes	Intake	Surface water	Permanent	Active
IN FROM CLEVELAND CITY NOTTINGHAM	21811	Yes	Intake	Surface water	Permanent	Active
IN FROM CLEVELAND CITY MORGAN	21810	Yes	Intake	Surface water	Permanent	Active
IN FROM CLEVELAND CITY CROWN	21809	Yes	Intake	Surface water	Permanent	Active
CLEVELAND PWS DISTRIBUTION	24175	No	Distribution System/Zone	-	-	Active
CROWN WTP HIGH PUMPS	36321	No	Pump Facility	-	-	Active
MORGAN WTP HIGH PUMPS	36322	No	Pump Facility	-	-	Active
BALDWIN WTP HIGH PUMPS	36323	No	Pump Facility	-	-	Active
NOTTINGHAM WTP HIGH PUMPS	36324	No	Pump Facility	-	-	Active
ENGLE PUMP STATION	36325	No	Pump Facility	-	-	Active
PARMA PUMP STATION	36326	No	Pump Facility	-	-	Active
INDEPENDENCE PUMP STATION	36327	No	Pump Facility	-	-	Active
PLEASANT VALLEY PUMP STATION	36328	No	Pump Facility	-	-	Active
NORTH ROYALTON PUMP STATION	36329	No	Pump Facility	-	-	Active
PEARL PUMP STATION	36330	No	Pump Facility	-	-	Active
BROADWAY PUMP STATION	36332	No	Pump Facility	-	-	Active
GREEN PUMP STATION	36333	No	Pump Facility	-	-	Active
CEDAR WINCHESTER PUMP STA	36334	No	Pump Facility	-	-	Active
SHEPARD PUMP STATION	36335	No	Pump Facility	-	-	Active
DARROW PUMP STATION	36336	No	Pump Facility	-	-	Active
CROWN WTP LOW PUMPS	36341	No	Pump Facility	-	-	Active
MORGAN WTP LOW PUMPS	36342	No	Pump Facility	-	-	Active
BALDWIN WTP LOW PUMPS	36343	No	Pump Facility	-	-	Active
NOTTINGHAM WTP LOW PUMPS	36344	No	Pump Facility	-	-	Active
NEW BOOSTER STATION	22506	No	Pump Facility	-	-	Inactive
Cleveland PWS Baldwin P01	84444	No	Sampling Station	-	-	Inactive
Cleveland PWS Crown P02	84449	No	Sampling Station	-	-	Inactive
Cleveland PWS Morgan P03	84454	No	Sampling Station	-	-	Inactive
Cleveland PWS Nottingham P04	84459	No	Sampling Station	-	-	Inactive
BASSETT ELEVATED - 0.5 MG	36299	No	Storage	-	-	Active
DOVER SURGE (CROWN) ELEVATED - 2 MG	36300	No	Storage	-	-	Active
PEARL #2 GROUND - 10 MG	36305	No	Storage	-	-	Active
PEARL #1 GROUND - 5 MG	36306	No	Storage	-	-	Active
STRONGSVILLE ELEVATED - 1.0 MG	36307	No	Storage	-	-	Active
KELLER #1 ELEVATED - 1 MG	36308	No	Storage	-	-	Active
PARMA GROUND - 23 MG	36309	No	Storage	-	-	Active
PLEASANT VALLEY GROUND - 5 MG	36310	No	Storage	-	-	Active
BLOSSOM HILL #1 ELEVATED - 3 MG	36311	No	Storage	-	-	Active
BLOSSOM HILL #2 ELEVATED - 0.5 MG	36312	No	Storage	-	-	Active
INDEPENDENCE GROUND - 3.4 MG	36313	No	Storage	-	-	Active
BRECKSVILLE ELEVATED - 0.75 MG	36314	No	Storage	-	-	Active
DARROW ELEVATED - 3.0 MG	36315	No	Storage	-	-	Active
LEDGE ELEVATED - 0.5 MG	36316	No	Storage	-	-	Active
SOUTH TWINSBURG ELEVATED - 1.0 MG	36317	No	Storage	-	-	Active
GREEN #1 (WEST) GROUND - 10 MG	36318	No	Storage	-	-	Active
GREEN #2 (EAST) GROUND - 10 MG	36319	No	Storage	-	-	Active
KINSMAN ELEVATED - 2 MG	36320	No	Storage	-	-	Active
NORTH ROYALTON #1 CONCRETE GROUND - 2 MG	36345	No	Storage	-	-	Active
NORTH ROYALTON #2 CONCRETE GROUND - 3 MG	36346	No	Storage	-	-	Active
FAIRMOUNT SURGE(BALDWIN)ELEVATED- 0.3 MG	36830	No	Storage	-	-	Active

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Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
CLEVELAND BALDWIN WTP	2540	Permanganate	Taste / odor control
CLEVELAND BALDWIN WTP	2540	Hypochlorination, Pre	Disinfection
CLEVELAND BALDWIN WTP	2540	Activated Carbon, Powdered	Taste / odor control
CLEVELAND BALDWIN WTP	2540	Rapid Mix	Particulate removal
CLEVELAND BALDWIN WTP	2540	Flocculation	Particulate removal
CLEVELAND BALDWIN WTP	2540	Sedimentation	Particulate removal
CLEVELAND BALDWIN WTP	2540	Filtration, Rapid Sand	Particulate removal
CLEVELAND BALDWIN WTP	2540	Fluoridation	Other
CLEVELAND BALDWIN WTP	2540	Inhibitor, Orthophosphate	Corrosion control
CLEVELAND BALDWIN WTP	2540	Hypochlorination, Pre	Disinfection
CLEVELAND BALDWIN WTP	2540	Hypochlorination, Post	Disinfection
CLEVELAND BALDWIN WTP	2540	Coagulation	Particulate removal
CLEVELAND MORGAN WTP	2541	Activated Carbon, Powdered	Taste / odor control
CLEVELAND MORGAN WTP	2541	Coagulation	Particulate removal
CLEVELAND MORGAN WTP	2541	Rapid Mix	Particulate removal
CLEVELAND MORGAN WTP	2541	Flocculation	Particulate removal
CLEVELAND MORGAN WTP	2541	Sedimentation	Particulate removal
CLEVELAND MORGAN WTP	2541	Filtration, Rapid Sand	Particulate removal
CLEVELAND MORGAN WTP	2541	Fluoridation	Other
CLEVELAND MORGAN WTP	2541	Inhibitor, Orthophosphate	Corrosion control
CLEVELAND MORGAN WTP	2541	Hypochlorination, Post	Disinfection
CLEVELAND MORGAN WTP	2541	Permanganate	Disinfection by-products control
CLEVELAND MORGAN WTP	2541	pH Adjustment, Pre	Particulate removal
CLEVELAND MORGAN WTP	2541	Hypochlorination, Pre	Disinfection
CLEVELAND MORGAN WTP	2541	Hypochlorination, Post	Disinfection
CLEVELAND MORGAN WTP	2541	Hypochlorination, Post	Disinfection
CLEVELAND MORGAN WTP	2541	pH Adjustment	Particulate removal
CLEVELAND NOTTINGHAM WTP	2542	Permanganate	Taste / odor control
CLEVELAND NOTTINGHAM WTP	2542	pH Adjustment, Pre	Particulate removal
CLEVELAND NOTTINGHAM WTP	2542	Activated Carbon, Powdered	Taste / odor control
CLEVELAND NOTTINGHAM WTP	2542	Hypochlorination, Pre	Disinfection
CLEVELAND NOTTINGHAM WTP	2542	Coagulation	Particulate removal
CLEVELAND NOTTINGHAM WTP	2542	Rapid Mix	Particulate removal
CLEVELAND NOTTINGHAM WTP	2542	Flocculation	Particulate removal
CLEVELAND NOTTINGHAM WTP	2542	Sedimentation	Particulate removal
CLEVELAND NOTTINGHAM WTP	2542	Coagulation	Particulate removal
CLEVELAND NOTTINGHAM WTP	2542	Filtration, Rapid Sand	Particulate removal
CLEVELAND NOTTINGHAM WTP	2542	Fluoridation	Other
CLEVELAND NOTTINGHAM WTP	2542	Inhibitor, Orthophosphate	Corrosion control
CLEVELAND NOTTINGHAM WTP	2542	pH Adjustment, Post	Corrosion control
CLEVELAND NOTTINGHAM WTP	2542	Hypochlorination, Post	Disinfection
CLEVELAND NOTTINGHAM WTP	2542	Hypochlorination, Pre	Disinfection
CLEVELAND CROWN WTP	2543	Permanganate	Taste / odor control
CLEVELAND CROWN WTP	2543	Coagulation	Particulate removal
CLEVELAND CROWN WTP	2543	Flocculation	Particulate removal
CLEVELAND CROWN WTP	2543	Sedimentation	Particulate removal
CLEVELAND CROWN WTP	2543	Coagulation	Particulate removal
CLEVELAND CROWN WTP	2543	Rapid Mix	Particulate removal
CLEVELAND CROWN WTP	2543	Filtration, Rapid Sand	Particulate removal
CLEVELAND CROWN WTP	2543	Fluoridation	Other

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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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