Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	MO1010510
PWS Name	MAYSVILLE PWS
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	No
Population Served	1096
County Served	DeKalb

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 of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	934292	Known	01-NOV-2025	30-NOV-2025	No
MR	Monitoring, Turbidity (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934293	Known	01-NOV-2025	30-NOV-2025	No
MR	Monitoring, Turbidity (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934294	Known	01-NOV-2025	30-NOV-2025	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	934295	Known	01-OCT-2025	31-DEC-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	934296	Known	01-OCT-2025	31-DEC-2025	Yes
MR	Lead Consumer Notice	Lead and Copper Rule	Lead and Copper Rule	934297	Open	19-AUG-2025	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	934290	Known	01-JUL-2025	30-SEP-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	934291	Known	01-JUL-2025	30-SEP-2025	Yes
MR	Monitoring, Turbidity (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934288	Returned to Compliance	01-JUL-2025	31-JUL-2025	No
MR	Monitoring, Turbidity (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934287	Returned to Compliance	01-JUL-2025	31-JUL-2025	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	934286	Returned to Compliance	01-JUL-2025	31-JUL-2025	No
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934283	Returned to Compliance	01-NOV-2024	30-NOV-2024	Yes
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	934284	Returned to Compliance	01-NOV-2024	30-NOV-2024	No
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934282	Returned to Compliance	01-OCT-2024	31-OCT-2024	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	934275	Returned to Compliance	01-SEP-2024	30-SEP-2024	Yes
TT	Single Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934276	Returned to Compliance	01-SEP-2024	30-SEP-2024	Yes
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934274	Returned to Compliance	01-SEP-2024	30-SEP-2024	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	934271	Returned to Compliance	01-AUG-2024	31-AUG-2024	Yes
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934277	Returned to Compliance	01-AUG-2024	31-AUG-2024	Yes
TT	Single Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934272	Returned to Compliance	01-AUG-2024	31-AUG-2024	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorite	934270	Returned to Compliance	01-DEC-2022	31-DEC-2022	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	934269	Returned to Compliance	01-OCT-2017	31-DEC-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	934268	Returned to Compliance	01-JUL-2017	30-SEP-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	934266	Returned to Compliance	01-APR-2017	30-JUN-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	934267	Returned to Compliance	01-APR-2017	30-JUN-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	934264	Returned to Compliance	01-JAN-2017	31-MAR-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	934265	Returned to Compliance	01-JAN-2017	31-MAR-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	934263	Returned to Compliance	01-OCT-2016	31-DEC-2016	Yes
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934261	Returned to Compliance	01-AUG-2016	31-AUG-2016	Yes
TT	Single Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934260	Returned to Compliance	01-AUG-2016	31-AUG-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	934262	Returned to Compliance	01-JUL-2016	30-SEP-2016	Yes
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934258	Returned to Compliance	01-JUN-2016	30-JUN-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	934259	Returned to Compliance	01-APR-2016	30-JUN-2016	Yes
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934257	Returned to Compliance	01-FEB-2016	29-FEB-2016	Yes
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934256	Returned to Compliance	01-SEP-2015	30-SEP-2015	Yes
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934255	Returned to Compliance	01-AUG-2015	31-AUG-2015	Yes
TT	Single Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934254	Returned to Compliance	01-JUL-2015	31-JUL-2015	Yes
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934253	Returned to Compliance	01-JUL-2015	31-JUL-2015	Yes
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934252	Returned to Compliance	01-JUN-2015	30-JUN-2015	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	934251	Returned to Compliance	01-OCT-2014	31-DEC-2014	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	934249	Returned to Compliance	01-JUL-2014	30-SEP-2014	Yes
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	934250	Returned to Compliance	01-JUL-2014	30-SEP-2014	Yes
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934247	Returned to Compliance	01-JUL-2014	31-JUL-2014	Yes
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934245	Returned to Compliance	01-MAY-2014	31-MAY-2014	Yes
TT	Single Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934244	Returned to Compliance	01-APR-2014	30-APR-2014	Yes
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	934246	Returned to Compliance	01-APR-2014	30-JUN-2014	Yes
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	934243	Returned to Compliance	01-APR-2014	30-APR-2014	Yes
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	934242	Returned to Compliance	01-JAN-2014	31-MAR-2014	Yes
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	934239	Returned to Compliance	01-OCT-2013	31-DEC-2013	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	934238	Returned to Compliance	22-SEP-2013	-	No

1 - 50 of 115

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
246	934292	SIE	State Public Notification requested	22-DEC-2025	State	-
248	934293	SIE	State Public Notification requested	22-DEC-2025	State	-
250	934294	SIE	State Public Notification requested	22-DEC-2025	State	-
244	934291	SFJ	State Formal Notice of Violation issued	11-DEC-2025	State	-
242	934290	SFJ	State Formal Notice of Violation issued	11-DEC-2025	State	-
240	934286	SOX	State Compliance achieved	13-NOV-2025	State	SOX vios per EPA RTC policy. LJZ 11/13/2025
240	934287	SOX	State Compliance achieved	13-NOV-2025	State	SOX vios per EPA RTC policy. LJZ 11/13/2025
240	934288	SOX	State Compliance achieved	13-NOV-2025	State	SOX vios per EPA RTC policy. LJZ 11/13/2025
225	934271	SOX	State Compliance achieved	11-FEB-2025	State	System was able to maintain turbidity levels below 0.3 NTU in 95% of samples taken during the months of December and January. System maintained all individual turbidity samples below 1.0 NTU. MJ 2/11/25
225	934272	SOX	State Compliance achieved	11-FEB-2025	State	System was able to maintain turbidity levels below 0.3 NTU in 95% of samples taken during the months of December and January. System maintained all individual turbidity samples below 1.0 NTU. MJ 2/11/25
225	934274	SOX	State Compliance achieved	11-FEB-2025	State	System was able to maintain turbidity levels below 0.3 NTU in 95% of samples taken during the months of December and January. System maintained all individual turbidity samples below 1.0 NTU. MJ 2/11/25
225	934283	SOX	State Compliance achieved	11-FEB-2025	State	System was able to maintain turbidity levels below 0.3 NTU in 95% of samples taken during the months of December and January. System maintained all individual turbidity samples below 1.0 NTU. MJ 2/11/25
225	934276	SOX	State Compliance achieved	11-FEB-2025	State	System was able to maintain turbidity levels below 0.3 NTU in 95% of samples taken during the months of December and January. System maintained all individual turbidity samples below 1.0 NTU. MJ 2/11/25
225	934277	SOX	State Compliance achieved	11-FEB-2025	State	System was able to maintain turbidity levels below 0.3 NTU in 95% of samples taken during the months of December and January. System maintained all individual turbidity samples below 1.0 NTU. MJ 2/11/25
225	934282	SOX	State Compliance achieved	11-FEB-2025	State	System was able to maintain turbidity levels below 0.3 NTU in 95% of samples taken during the months of December and January. System maintained all individual turbidity samples below 1.0 NTU. MJ 2/11/25
225	934275	SOX	State Compliance achieved	11-FEB-2025	State	System was able to maintain turbidity levels below 0.3 NTU in 95% of samples taken during the months of December and January. System maintained all individual turbidity samples below 1.0 NTU. MJ 2/11/25
222	934284	SOX	State Compliance achieved	16-DEC-2024	State	Per EPA compliance policy, system has RTC - VL 1/9/2025;
181	934270	SIF	State Public Notification received	03-FEB-2023	State	-
174	934263	SOX	State Compliance achieved	03-JUL-2018	State	02 vios sox'd per EPA RTC policy. System did not reach MCL for 1Q18. DLM 07/03/2018; SOX 259 vio per EPA's RTC policy 11/1/2018PV;
174	934268	SOX	State Compliance achieved	03-JUL-2018	State	02 vios sox'd per EPA RTC policy. System did not reach MCL for 1Q18. DLM 07/03/2018; SOX 259 vio per EPA's RTC policy 11/1/2018PV;
174	934267	SOX	State Compliance achieved	03-JUL-2018	State	02 vios sox'd per EPA RTC policy. System did not reach MCL for 1Q18. DLM 07/03/2018; SOX 259 vio per EPA's RTC policy 11/1/2018PV;
174	934266	SOX	State Compliance achieved	03-JUL-2018	State	02 vios sox'd per EPA RTC policy. System did not reach MCL for 1Q18. DLM 07/03/2018; SOX 259 vio per EPA's RTC policy 11/1/2018PV;
174	934259	SOX	State Compliance achieved	03-JUL-2018	State	02 vios sox'd per EPA RTC policy. System did not reach MCL for 1Q18. DLM 07/03/2018; SOX 259 vio per EPA's RTC policy 11/1/2018PV;
174	934262	SOX	State Compliance achieved	03-JUL-2018	State	02 vios sox'd per EPA RTC policy. System did not reach MCL for 1Q18. DLM 07/03/2018; SOX 259 vio per EPA's RTC policy 11/1/2018PV;
174	934269	SOX	State Compliance achieved	03-JUL-2018	State	02 vios sox'd per EPA RTC policy. System did not reach MCL for 1Q18. DLM 07/03/2018; SOX 259 vio per EPA's RTC policy 11/1/2018PV;
174	934264	SOX	State Compliance achieved	03-JUL-2018	State	02 vios sox'd per EPA RTC policy. System did not reach MCL for 1Q18. DLM 07/03/2018; SOX 259 vio per EPA's RTC policy 11/1/2018PV;
174	934265	SOX	State Compliance achieved	03-JUL-2018	State	02 vios sox'd per EPA RTC policy. System did not reach MCL for 1Q18. DLM 07/03/2018; SOX 259 vio per EPA's RTC policy 11/1/2018PV;
170	934261	SFO	State Administrative/Compliance Order with penalty issued	20-FEB-2018	State	1 year AOC to fix DBP and turbidity issues, and add chlorine injection point. CDF
170	934260	SFO	State Administrative/Compliance Order with penalty issued	20-FEB-2018	State	1 year AOC to fix DBP and turbidity issues, and add chlorine injection point. CDF
170	934258	SFO	State Administrative/Compliance Order with penalty issued	20-FEB-2018	State	1 year AOC to fix DBP and turbidity issues, and add chlorine injection point. CDF
170	934257	SFO	State Administrative/Compliance Order with penalty issued	20-FEB-2018	State	1 year AOC to fix DBP and turbidity issues, and add chlorine injection point. CDF
144	934219	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934256	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934221	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934222	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934223	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934224	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934225	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934226	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934227	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934228	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934229	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934230	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934231	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934232	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934233	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934234	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934235	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934236	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;
144	934237	SOX	State Compliance achieved	26-OCT-2016	State	RTC per EPA policy SEH 10-26-16;

1 - 50 of 112

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
SOUTH LAKE INTAKE	98855	Yes	Intake	Surface water	Other	Inactive
WEST LAKE	84414	Yes	Reservoir	Surface water	Permanent	Inactive
WILLOWBROOK LAKE	84416	Yes	Reservoir	Surface water	Permanent	Active
SOUTH LAKE	98854	Yes	Reservoir	Surface water	Other	Inactive
WEST LAKE INTAKE	84415	Yes	Intake	Surface water	Permanent	Inactive
WILLOWBROOK LAKE	84417	Yes	Intake	Surface water	Permanent	Active
DISTRIBUTION SYSTEM	85243	No	Distribution System/Zone	-	-	Active
BOOSTER PUMP	103018	No	Pump Facility	-	-	Active
FINISHED WATER BOOSTER PUMP	108263	No	Pump Facility	-	-	Active
CHEMICAL SAMPLES	90096	No	Sampling Station	-	-	Active
70K GAL CLEARWELL	103016	No	Storage	-	-	Active
75K GAL ELEVATED STORAGE TANK	103017	No	Storage	-	-	Active
100K GAL ELEVATED TOWER	75446	No	Storage	-	-	Active
MAYSVILLE - TREATMENT PLANT	66953	No	Treatment Plant	-	-	Active

1 - 14 of 14

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
MAYSVILLE - TREATMENT PLANT	66953	4-Log Treatment of Viruses	Disinfection
MAYSVILLE - TREATMENT PLANT	66953	Chloramines	Disinfection by-products control
MAYSVILLE - TREATMENT PLANT	66953	Coagulation	Particulate removal
MAYSVILLE - TREATMENT PLANT	66953	Permanganate	Iron removal
MAYSVILLE - TREATMENT PLANT	66953	pH Adjustment, Pre	Particulate removal
MAYSVILLE - TREATMENT PLANT	66953	Rapid Mix	Particulate removal
MAYSVILLE - TREATMENT PLANT	66953	Flocculation	Particulate removal
MAYSVILLE - TREATMENT PLANT	66953	Sedimentation	Particulate removal
MAYSVILLE - TREATMENT PLANT	66953	Filtration, Rapid Sand	Particulate removal
MAYSVILLE - TREATMENT PLANT	66953	Gaseous Chlorination, Post	Disinfection
MAYSVILLE - TREATMENT PLANT	66953	Permanganate	Organics removal
MAYSVILLE - TREATMENT PLANT	66953	Chlorine Dioxide	Disinfection by-products control

1 - 12 of 12

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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