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Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS IDTX0370018
PWS NameNORTH CHEROKEE WSC
PWS TypeCommunity water system
Owner TypeLocal government
Primary SourceSurface water purchased
Primacy TypeState
Is Wholesaler?Yes
Population Served6951
County ServedCherokee

Note


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.

PWS Violation


Violations

Violation Category CodeViolation Type DescriptionRule NameContaminant NameViolation IDCompliance Status DescriptionCompliance Period Begin DateCompliance Period End DateIs Health Based Ind
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068832Returned to Compliance01-APR-202330-JUN-2023Yes
MRMonitoring and Reporting (DBP)Stage 1 Disinfectants and Disinfection Byproducts RuleChlorine100068827Returned to Compliance01-JAN-201831-MAR-2018No
OtherPublic Notification Violation for NPDWR ViolationPublic Notice Rule and Revised PN RulePublic Notice100068826Returned to Compliance07-JUL-2016 - No
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068825Returned to Compliance01-APR-201630-JUN-2016Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068823Returned to Compliance01-JAN-201631-MAR-2016Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068818Returned to Compliance01-OCT-201531-DEC-2015Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068819Returned to Compliance01-OCT-201531-DEC-2015Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068817Returned to Compliance01-JUL-201530-SEP-2015Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068816Returned to Compliance01-APR-201530-JUN-2015Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068815Returned to Compliance01-JAN-201531-MAR-2015Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068811Returned to Compliance01-OCT-201431-DEC-2014Yes
MRMonitoring and Reporting (DBP)Stage 1 Disinfectants and Disinfection Byproducts RuleChlorine100068812Returned to Compliance01-JUL-201430-SEP-2014No
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068810Returned to Compliance01-JUL-201430-SEP-2014Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068809Returned to Compliance01-APR-201430-JUN-2014Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068806Returned to Compliance01-JAN-201431-MAR-2014Yes
MRLead Consumer NoticeLead and Copper RuleLead and Copper Rule100068800Returned to Compliance30-DEC-2013 - No
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068801Returned to Compliance01-OCT-201331-DEC-2013Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068799Returned to Compliance01-JUL-201330-SEP-2013Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068795Returned to Compliance01-APR-201330-JUN-2013Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068790Returned to Compliance01-JAN-201331-MAR-2013Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100068788Returned to Compliance01-OCT-201231-DEC-2012Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM100068784Returned to Compliance01-JAN-201231-MAR-2012Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM100068783Returned to Compliance01-OCT-201131-DEC-2011Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM100068782Returned to Compliance01-APR-201130-JUN-2011Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM100068781Returned to Compliance01-JAN-201131-MAR-2011Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM100068778Returned to Compliance01-OCT-201031-DEC-2010Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM100068366Returned to Compliance01-JUL-201030-SEP-2010Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM100067912Returned to Compliance01-APR-201030-JUN-2010Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM100067170Returned to Compliance01-JAN-201031-MAR-2010Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM90064883Returned to Compliance01-OCT-200931-DEC-2009Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM90064472Returned to Compliance01-JUL-200930-SEP-2009Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM90062794Returned to Compliance01-APR-200930-JUN-2009Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM90062713Returned to Compliance01-JAN-200931-MAR-2009Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM90041228Returned to Compliance01-OCT-200831-DEC-2008Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM80041064Returned to Compliance01-JUL-200830-SEP-2008Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)80041033Returned to Compliance01-JUL-200830-SEP-2008Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM1908Returned to Compliance01-APR-200830-JUN-2008Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)1808Returned to Compliance01-APR-200830-JUN-2008Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM1708Returned to Compliance01-JAN-200831-MAR-2008Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)1608Returned to Compliance01-JAN-200831-MAR-2008Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)1408Returned to Compliance01-OCT-200731-DEC-2007Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM1508Returned to Compliance01-OCT-200731-DEC-2007Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM1308Returned to Compliance01-JUL-200730-SEP-2007Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)1208Returned to Compliance01-JUL-200730-SEP-2007Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM1107Returned to Compliance01-APR-200730-JUN-2007Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM1007Returned to Compliance01-JAN-200731-MAR-2007Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM907Returned to Compliance01-OCT-200631-DEC-2006Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM807Returned to Compliance01-JUL-200630-SEP-2006Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM706Returned to Compliance01-APR-200630-JUN-2006Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM606Returned to Compliance01-JAN-200631-MAR-2006Yes
  • 1 - 50 of 54

Enforcement Actions


Enforcement Actions

Latest Enforcement IDAssociated To Violation IDEnforcement Action Type CodeEnforcement Action DescriptionEnforcement DateOriginator DescriptionEnforcement Comment
100116953100068832SOXState Compliance achieved17-AUG-2023StateVIOL SOX'D BASED ON 3Q2023 LRAA
100116949100068827SIFState Public Notification received28-MAR-2019State -
100116945100068826SIAState Violation/Reminder Notice16-AUG-2016State -
100116942100068825SIFState Public Notification received12-JUL-2016State -
100116943100068823SIFState Public Notification received12-JUL-2016State -
100116941100068799SOXState Compliance achieved06-JUL-2016State07/21/16; SOXED TTHM VIOLATIONS BASED ON 3Q2016 LRAA
100116941100068809SOXState Compliance achieved06-JUL-2016State07/21/16; SOXED TTHM VIOLATIONS BASED ON 3Q2016 LRAA
100116941100068810SOXState Compliance achieved06-JUL-2016State07/21/16; SOXED TTHM VIOLATIONS BASED ON 3Q2016 LRAA
100116941100068811SOXState Compliance achieved06-JUL-2016State07/21/16; SOXED TTHM VIOLATIONS BASED ON 3Q2016 LRAA
100116941100068815SOXState Compliance achieved06-JUL-2016State07/21/16; SOXED TTHM VIOLATIONS BASED ON 3Q2016 LRAA
100116941100068819SOXState Compliance achieved06-JUL-2016State07/21/16; SOXED TTHM VIOLATIONS BASED ON 3Q2016 LRAA
100116941100068817SOXState Compliance achieved06-JUL-2016State07/21/16; SOXED TTHM VIOLATIONS BASED ON 3Q2016 LRAA
100116941100068795SOXState Compliance achieved06-JUL-2016State07/21/16; SOXED TTHM VIOLATIONS BASED ON 3Q2016 LRAA
100116941100068784SOXState Compliance achieved06-JUL-2016State07/21/16; SOXED TTHM VIOLATIONS BASED ON 3Q2016 LRAA
100116941100068783SOXState Compliance achieved06-JUL-2016State07/21/16; SOXED TTHM VIOLATIONS BASED ON 3Q2016 LRAA
100116941100068816SOXState Compliance achieved06-JUL-2016State07/21/16; SOXED TTHM VIOLATIONS BASED ON 3Q2016 LRAA
100116941100068806SOXState Compliance achieved06-JUL-2016State07/21/16; SOXED TTHM VIOLATIONS BASED ON 3Q2016 LRAA
100116941100068801SOXState Compliance achieved06-JUL-2016State07/21/16; SOXED TTHM VIOLATIONS BASED ON 3Q2016 LRAA
100116936100068818SOXState Compliance achieved10-MAR-2016State04/04/16; CAN SOX VIOLATIONS BASED ON 1Q2016 DBP2-02 LRAA
100116922100068790SFOState Administrative/Compliance Order with penalty issued12-JUN-2015StateDOCKET NO 2014-1290-PWS-E; FINAL TR DUE DATE 06/26/2016
100116922100068788SFOState Administrative/Compliance Order with penalty issued12-JUN-2015StateDOCKET NO 2014-1290-PWS-E; FINAL TR DUE DATE 06/26/2016
100116922100068782SFOState Administrative/Compliance Order with penalty issued12-JUN-2015StateDOCKET NO 2014-1290-PWS-E; FINAL TR DUE DATE 06/26/2016
100116918100068812SIFState Public Notification received26-MAR-2015State -
100116906100068800SOXState Compliance achieved11-SEP-2014State -
100116904100068781SFJState Formal Notice of Violation issued22-AUG-2014StateSYSTEM REFERRED TO ENFORCEMENT FOR CHEM VIOLATIONS
100116904100068778SFJState Formal Notice of Violation issued22-AUG-2014StateSYSTEM REFERRED TO ENFORCEMENT FOR CHEM VIOLATIONS
100116904100068366SFJState Formal Notice of Violation issued22-AUG-2014StateSYSTEM REFERRED TO ENFORCEMENT FOR CHEM VIOLATIONS
100116904100067912SFJState Formal Notice of Violation issued22-AUG-2014StateSYSTEM REFERRED TO ENFORCEMENT FOR CHEM VIOLATIONS
100116904100067170SFJState Formal Notice of Violation issued22-AUG-2014StateSYSTEM REFERRED TO ENFORCEMENT FOR CHEM VIOLATIONS
10011690490064472SFJState Formal Notice of Violation issued22-AUG-2014StateSYSTEM REFERRED TO ENFORCEMENT FOR CHEM VIOLATIONS
10011690490064883SFJState Formal Notice of Violation issued22-AUG-2014StateSYSTEM REFERRED TO ENFORCEMENT FOR CHEM VIOLATIONS
1001169231508SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
1001169231308SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
1001169231908SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
10011692380041064SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
10011692390041228SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
10011692390062713SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
10011692390062794SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
1001169231107SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
1001169231007SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
100116923907SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
100116923807SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
100116923706SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
100116923606SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
100116923506SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
100116923306SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
100116923205SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
100116923105SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
1001169231708SOXState Compliance achieved12-JUL-2011State07/09/15; DATA CLEAN UP, PER 3Q2011 AVERAGE 98.4+69.2+55.4+92.7=315.7/4=78.9UG/L CAN SOX PREVIOUS VIOLATIONS
1001168491808SOXState Compliance achieved13-APR-2011StateSDWIS CLEANUP
  • 1 - 50 of 54

PWS Facilities


All Facilities

Facility NameFacility IDIs SourceFacility Type DescriptionWater Type DescriptionAvailability DescriptionFacility Activity Status
SW FROM JACKSONVILLE CR 4102/HEATH LN34510YesConsecutive ConnectionGround waterPermanentActive
2 - STATE HWY 135 / CR 4905157285YesWell Ground waterPermanentActive
1 - 5078 CR 3405111682YesWell Ground waterPermanentActive
SW FROM JACKSONVILLE / MT SELENA PLANT114137YesConsecutive ConnectionSurface waterPermanentActive
SW FROM JACKSONVILLE CR 4127/US HWY 6934509YesConsecutive ConnectionSurface waterPermanentActive
DISTRIBUTION SYSTEM38941NoDistribution System/Zone - - Active
CR 3405 PLANT - 500 GPM - SP114141NoPump Facility - - Active
CR 4305 PLANT - 500 GPM - SP114142NoPump Facility - - Active
MT SELMAN PLANT - 375 GPM - SP79271NoPump Facility - - Active
MT SELMAN PLANT - 375 GPM - SP79272NoPump Facility - - Active
MIXON PLANT - 375 GPM - SP79273NoPump Facility - - Active
MIXON PLANT - 375 GPM - SP79274NoPump Facility - - Active
894 CR 4102 - HEATH LN PLANT133817NoSampling Station - - Active
47518 HWY 69133818NoSampling Station - - Active
STATE HWY 135 / CR 4905167747NoSampling Station - - Active
STATE HWY 135 / CR 4905167748NoSampling Station - - Active
894 CR 4102 - HEATH LN PLANT49239NoSampling Station - - Active
47518 HWY 6949240NoSampling Station - - Active
CR 3405 PLANT - 0.010 MG - HD114139NoStorage - - Active
CR 3405 PLANT - 0.100 MG - GR114140NoStorage - - Active
MT SELMAN PLANT - 0.012 MG - HD97350NoStorage - - Active
MT SELMAN PLANT - 0.030 MG - GR97351NoStorage - - Active
MT SELMAN PLANT - 0.101 MG - GR97352NoStorage - - Active
MIXON PLANT - 0.008 MG - HD97353NoStorage - - Active
MIXON PLANT - 0.034 MG - GR97354NoStorage - - Active
MIXON PLANT - 0.042 MG - GR97355NoStorage - - Active
HEATH PLANT - 0.025 MG - HD97356NoStorage - - Active
HEATH PLANT - 0.042 MG - GR97357NoStorage - - Active
PLANT - STATE HWY 135 / CR 4905167749NoTreatment Plant - - Active
PLANT - PURCHASE SW / CR 343262553NoTreatment Plant - - Active
PLANT - CR 340562554NoTreatment Plant - - Active
  • 1 - 31 of 31

PWS Treatment Processes


Treatment Processes

Facility NameFacility IDTreatment ProcessTreatment Objective
PLANT - STATE HWY 135 / CR 4905167749Gaseous Chlorination, PreDisinfection
PLANT - PURCHASE SW / CR 343262553Gaseous Chlorination, PreDisinfection
PLANT - CR 340562554Gaseous Chlorination, PreDisinfection
  • 1 - 3 of 3

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.