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Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS IDTX2000005
PWS NameNORTH RUNNELS WSC
PWS TypeCommunity water system
Owner TypeLocal government
Primary SourceSurface water purchased
Primacy TypeState
Is Wholesaler?No
Population Served2766
County ServedRunnels

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
MRFollow-up Or Routine LCR Tap M/RLead and Copper RuleLead and Copper Rule100069401Returned to Compliance01-OCT-2024 - No
OtherPublic Notification Violation for NPDWR ViolationPublic Notice Rule and Revised PN RulePublic Notice100069400Open22-APR-2022 - No
OtherPublic Notification Violation for NPDWR ViolationPublic Notice Rule and Revised PN RulePublic Notice100069399Open22-APR-2022 - No
OtherPublic Notification Violation for NPDWR ViolationPublic Notice Rule and Revised PN RulePublic Notice100069398Open15-JAN-2022 - No
OtherPublic Notification Violation for NPDWR ViolationPublic Notice Rule and Revised PN RulePublic Notice100069397Open15-JAN-2022 - No
OtherPublic Notification Violation for NPDWR ViolationPublic Notice Rule and Revised PN RulePublic Notice100069396Returned to Compliance23-DEC-2021 - No
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100069392Returned to Compliance01-APR-202130-JUN-2021Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)100069393Returned to Compliance01-APR-202130-JUN-2021Yes
MRFailure Submit IDSE/Subpart V Plan RptStage 2 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)100069388Returned to Compliance21-MAR-2021 - No
MRFailure Submit IDSE/Subpart V Plan RptStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100069389Returned to Compliance21-MAR-2021 - No
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100069386Returned to Compliance01-JAN-202131-MAR-2021Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)100069387Returned to Compliance01-JAN-202131-MAR-2021Yes
MRFailure Submit IDSE/Subpart V Plan RptStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100069379Returned to Compliance09-DEC-2020 - No
MRFailure Submit IDSE/Subpart V Plan RptStage 2 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)100069378Returned to Compliance09-DEC-2020 - No
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)100069381Returned to Compliance01-OCT-202031-DEC-2020Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100069380Returned to Compliance01-OCT-202031-DEC-2020Yes
MRFollow-up Or Routine LCR Tap M/RLead and Copper RuleLead and Copper Rule100069377Returned to Compliance01-OCT-2020 - No
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTTHM100069373Returned to Compliance01-JUL-202030-SEP-2020Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)100069374Returned to Compliance01-JUL-202030-SEP-2020Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)100069372Returned to Compliance01-APR-202030-JUN-2020Yes
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)100069368Returned to Compliance01-JAN-202031-MAR-2020Yes
MRLead Consumer NoticeLead and Copper RuleLead and Copper Rule100069367Returned to Compliance30-DEC-2019 - No
MRMonitoring and Reporting (DBP)Stage 1 Disinfectants and Disinfection Byproducts RuleChlorine100069363Returned to Compliance01-OCT-201831-DEC-2018No
MRFailure Submit IDSE/Subpart V Plan RptStage 2 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)100069360Returned to Compliance07-SEP-2018 - No
OtherConsumer Confidence Report Inadequate ReportingConsumer Confidence RuleConsumer Confidence Rule100069362Returned to Compliance01-JUL-2018 - No
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)100069356Returned to Compliance01-APR-201830-JUN-2018Yes
MRMonitoring and Reporting (DBP)Stage 1 Disinfectants and Disinfection Byproducts RuleChlorine100069359Returned to Compliance01-APR-201830-JUN-2018No
MCLMaximum Contaminant Level Violation, AverageStage 2 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)100069355Returned to Compliance01-JAN-201831-MAR-2018Yes
MRMonitoring and Reporting (DBP)Stage 1 Disinfectants and Disinfection Byproducts RuleChlorine100069352Returned to Compliance01-JUL-201730-SEP-2017No
MRMonitoring, RegularNitrate RuleNitrate100069351Returned to Compliance01-JAN-201631-DEC-2016No
MRMonitoring, RegularNitrate RuleNitrite100069350Returned to Compliance01-JAN-201631-DEC-2016No
MRLead Consumer NoticeLead and Copper RuleLead and Copper Rule100069347Returned to Compliance30-DEC-2013 - No
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM100069346Returned to Compliance01-APR-201330-JUN-2013Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM100069343Returned to Compliance01-JAN-201331-MAR-2013Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM100069338Returned to Compliance01-OCT-201231-DEC-2012Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM100069336Returned to Compliance01-JUL-201230-SEP-2012Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM100069333Returned to Compliance01-APR-201230-JUN-2012Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM100069332Returned to Compliance01-JAN-201231-MAR-2012Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM100069331Returned to Compliance01-OCT-201131-DEC-2011Yes
MRMonitoring, Routine Minor (TCR)Total Coliform RuleColiform (TCR)100069330Returned to Compliance01-SEP-201130-SEP-2011No
MRMonitoring, Routine Minor (TCR)Total Coliform RuleColiform (TCR)100069329Returned to Compliance01-AUG-201131-AUG-2011No
MRMonitoring, Repeat Minor (TCR)Total Coliform RuleColiform (TCR)100069328Returned to Compliance01-AUG-201131-AUG-2011No
MRMonitoring and Reporting (DBP)Stage 1 Disinfectants and Disinfection Byproducts RuleChlorine100069325Returned to Compliance01-JUL-201030-SEP-2010No
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM100067902Returned to Compliance01-APR-201030-JUN-2010Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM1706Returned to Compliance01-APR-200630-JUN-2006Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM1506Returned to Compliance01-JAN-200631-MAR-2006Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM1606Returned to Compliance01-OCT-200531-DEC-2005Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTotal Haloacetic Acids (HAA5)1206Returned to Compliance01-JUL-200530-SEP-2005Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM1106Returned to Compliance01-JUL-200530-SEP-2005Yes
MCLMaximum Contaminant Level Violation, AverageStage 1 Disinfectants and Disinfection Byproducts RuleTTHM905Returned to Compliance01-APR-200530-JUN-2005Yes
  • 1 - 50 of 58

Enforcement Actions


Enforcement Actions

Latest Enforcement IDAssociated To Violation IDEnforcement Action Type CodeEnforcement Action DescriptionEnforcement DateOriginator DescriptionEnforcement Comment
5652100069401SIFState Public Notification received07-NOV-2024State -
5654100069377SIFState Public Notification received07-NOV-2024State -
5653100069396SOXState Compliance achieved07-NOV-2024State -
5648100069400SIAState Violation/Reminder Notice13-MAY-2022State -
5647100069399SIAState Violation/Reminder Notice13-MAY-2022State -
5646100069398SIAState Violation/Reminder Notice08-FEB-2022State -
5645100069397SIAState Violation/Reminder Notice08-FEB-2022State -
5642100069374SFOState Administrative/Compliance Order with penalty issued25-AUG-2021StateTCEQ DOCKET NO 2020-1446-PWS-E; FINAL TR DUE DATE 9/9/2022.
5642100069372SFOState Administrative/Compliance Order with penalty issued25-AUG-2021StateTCEQ DOCKET NO 2020-1446-PWS-E; FINAL TR DUE DATE 9/9/2022.
5641100069380SOXState Compliance achieved12-AUG-2021StateVIOL SOX'S BASED ON HAA5 AND TTHM DBP2-02 3Q2021 LRAA
5641100069373SOXState Compliance achieved12-AUG-2021StateVIOL SOX'S BASED ON HAA5 AND TTHM DBP2-02 3Q2021 LRAA
5641100069386SOXState Compliance achieved12-AUG-2021StateVIOL SOX'S BASED ON HAA5 AND TTHM DBP2-02 3Q2021 LRAA
5641100069387SOXState Compliance achieved12-AUG-2021StateVIOL SOX'S BASED ON HAA5 AND TTHM DBP2-02 3Q2021 LRAA
5641100069392SOXState Compliance achieved12-AUG-2021StateVIOL SOX'S BASED ON HAA5 AND TTHM DBP2-02 3Q2021 LRAA
5641100069381SOXState Compliance achieved12-AUG-2021StateVIOL SOX'S BASED ON HAA5 AND TTHM DBP2-02 3Q2021 LRAA
5641100069368SOXState Compliance achieved12-AUG-2021StateVIOL SOX'S BASED ON HAA5 AND TTHM DBP2-02 3Q2021 LRAA
5641100069393SOXState Compliance achieved12-AUG-2021StateVIOL SOX'S BASED ON HAA5 AND TTHM DBP2-02 3Q2021 LRAA
5638100069378SOXState Compliance achieved15-JUL-2021StateVIOLATIONS SOX'D BASED ON RECIEPT OF 1Q2021 OEL REPORT WITH TODAY AS THE STATUS DATE
5638100069379SOXState Compliance achieved15-JUL-2021StateVIOLATIONS SOX'D BASED ON RECIEPT OF 1Q2021 OEL REPORT WITH TODAY AS THE STATUS DATE
5638100069388SOXState Compliance achieved15-JUL-2021StateVIOLATIONS SOX'D BASED ON RECIEPT OF 1Q2021 OEL REPORT WITH TODAY AS THE STATUS DATE
5638100069389SOXState Compliance achieved15-JUL-2021StateVIOLATIONS SOX'D BASED ON RECIEPT OF 1Q2021 OEL REPORT WITH TODAY AS THE STATUS DATE
5598100069367SOXState Compliance achieved18-MAR-2020State -
5596100069350SO0State no longer subject to Rule04-DEC-2019State20191204. JLAMANNA. PER CALL FROM OCE AND DISCUSSION WITH DWTRT TEAM LEAD EMMA JONES, EP002 NO LONGER SUBJECT TO M/R REQUIREMENTS DUE TO STATUS CHANGE TO EMERGENCY. CHEMICAL SCHEDULE REQ CLOSED DUE TO STATUS CHANGE.
5596100069351SO0State no longer subject to Rule04-DEC-2019State20191204. JLAMANNA. PER CALL FROM OCE AND DISCUSSION WITH DWTRT TEAM LEAD EMMA JONES, EP002 NO LONGER SUBJECT TO M/R REQUIREMENTS DUE TO STATUS CHANGE TO EMERGENCY. CHEMICAL SCHEDULE REQ CLOSED DUE TO STATUS CHANGE.
5590100069363SIFState Public Notification received22-APR-2019State -
5586100069362SOXState Compliance achieved15-MAR-2019State -
5589100069355SFOState Administrative/Compliance Order with penalty issued12-MAR-2019StateDOCKET NO 2018-0846-PWS-E; FILE CLOSED 12/12/2019
5589100069356SFOState Administrative/Compliance Order with penalty issued12-MAR-2019StateDOCKET NO 2018-0846-PWS-E; FILE CLOSED 12/12/2019
5584100069360SIFState Public Notification received12-NOV-2018State -
5581100069359SIFState Public Notification received22-OCT-2018State -
5565100069352SIFState Public Notification received25-JAN-2018State -
5554100069347SOXState Compliance achieved10-OCT-2016State -
5552100069331SOXState Compliance achieved23-SEP-2014State07/22/15; DATA CLEAN UP, PER 3Q2014 SYSTEM IS BACK IN COMPLIANCE
5552100069346SOXState Compliance achieved23-SEP-2014State07/22/15; DATA CLEAN UP, PER 3Q2014 SYSTEM IS BACK IN COMPLIANCE
5552100069343SOXState Compliance achieved23-SEP-2014State07/22/15; DATA CLEAN UP, PER 3Q2014 SYSTEM IS BACK IN COMPLIANCE
5552100069338SOXState Compliance achieved23-SEP-2014State07/22/15; DATA CLEAN UP, PER 3Q2014 SYSTEM IS BACK IN COMPLIANCE
5552100069332SOXState Compliance achieved23-SEP-2014State07/22/15; DATA CLEAN UP, PER 3Q2014 SYSTEM IS BACK IN COMPLIANCE
5552100069333SOXState Compliance achieved23-SEP-2014State07/22/15; DATA CLEAN UP, PER 3Q2014 SYSTEM IS BACK IN COMPLIANCE
5552100069336SOXState Compliance achieved23-SEP-2014State07/22/15; DATA CLEAN UP, PER 3Q2014 SYSTEM IS BACK IN COMPLIANCE
5544100069325SOXState Compliance achieved06-DEC-2013State12/06/2013:BCARRUTH:DLQOR ERP REVIEW
5526100069328SOXState Compliance achieved01-APR-2012State -
5526100069330SOXState Compliance achieved01-APR-2012State -
5526100069329SOXState Compliance achieved01-APR-2012State -
5507100067902SIFState Public Notification received09-DEC-2010StateTCEQ RD 09/14/2010 PN 09/07/2010 COD 09/07/2010 PN Received for 2nd Quarter 2010 TTHM Violation. See iWUD comments.
41071106SOXState Compliance achieved21-MAR-2007State -
41071506SOXState Compliance achieved21-MAR-2007State -
41071606SOXState Compliance achieved21-MAR-2007State -
41071706SOXState Compliance achieved21-MAR-2007State -
4107205SOXState Compliance achieved21-MAR-2007State -
4107404SOXState Compliance achieved21-MAR-2007State -
  • 1 - 50 of 58

PWS Facilities


All Facilities

Facility NameFacility IDIs SourceFacility Type DescriptionWater Type DescriptionAvailability DescriptionFacility Activity Status
SW FROM CITY OF BALLINGER35743YesConsecutive ConnectionSurface waterEmergencyActive
SW PURCHASED FROM CITY OF WINTERS35744YesConsecutive ConnectionSurface waterPermanentActive
DISTRIBUTION SYSTEM44975NoDistribution System/Zone - - Active
PS 1 - LOOP 428 / CR 396 - 325 GPM - SP121460NoPump Facility - - Active
PS 4 - FM 1677 PUMPHREY - 400 GPM - SP121462NoPump Facility - - Active
PS 5 - HWY 153 WINGATE - 80 GPM - SP121464NoPump Facility - - Active
PS 6 - CR 237 / CR 235 - 130 GPM - SP121466NoPump Facility - - Active
PS 3 - LOOP 438 - 325 GPM - SP121468NoPump Facility - - Active
PS 8 - LEMONS GAP - 260 GPM - SP121472NoPump Facility - - Active
PS 2 - FM 1770 - 70 GPM - SP121475NoPump Facility - - Active
PS 3 - LOOP 438 - 325 GPM - SP121478NoPump Facility - - Active
PS 2 - FM 1770 - 70 GPM - SP121480NoPump Facility - - Active
PS 4 - FM 1677 PUMPHREY - 400 GPM - SP121483NoPump Facility - - Active
PS 6 - CR 237 / CR 235 - 130 GPM - SP121488NoPump Facility - - Active
PS 5- HWY 153 WINGATE - 80 GPM - SP121491NoPump Facility - - Active
PS 8 - LEMONS GAP - 260 GPM - SP121493NoPump Facility - - Active
PS 1 - LOOP 428 / CR 396 - 325 GPM - SP121498NoPump Facility - - Active
PS 1 - LOOP 428 / CR 396 - 325 GPM - SP127547NoPump Facility - - Active
PS 2 - FM 1770 - 100 GPM - SP127548NoPump Facility - - Active
PS 2 - FM 1770 - 100 GPM - SP127549NoPump Facility - - Active
INLINE BS - 20 GPM - SP127550NoPump Facility - - Active
INLINE BS -20 GPM - SP127551NoPump Facility - - Active
PS 8 - LEMONS GAP - 50 GPM - SP148227NoPump Facility - - Active
PS 8 - LEMONS GAP - 50 GPM - SP148228NoPump Facility - - Active
PS 7 - BALLINGER WTP -150 GPM - SP121470NoPump Facility - - Inactive
PS 7 - BALLINGER WTP - 150 GPM - SP121486NoPump Facility - - Inactive
TEXAS LOOP 438 E OF JEWELL ST; WINTERS139622NoSampling Station - - Active
BALLINGER PS - CR 288; BALLINGER139623NoSampling Station - - Active
TEXAS LOOP 438 E OF JEWELL ST, WINTERS57764NoSampling Station - - Active
BALLINGER PS - CR 288, BALLINGER57765NoSampling Station - - Active
PS 3 - LOOP 438 - 0.040 MG - GR121422NoStorage - - Active
PS 2 - FM 1770 - 0.002 MG - HD121424NoStorage - - Active
PS 2 - FM 1770 - 0.030 MG - GR121426NoStorage - - Active
PS 1 - LOOP 428 / CR 396 - 0.005 MG - HD121428NoStorage - - Active
PS 1 - LOOP 428 / CR 396 - 0.05 MG - GR121430NoStorage - - Active
PS 3 - LOOP 438 - 0.003 MG - HD121432NoStorage - - Active
PS 4 - FM 1677 PUMPHREY - 0.007 MG - HD121434NoStorage - - Active
PS 4 - FM 1677 PUMPHREY - 0.050 MG - GR121436NoStorage - - Active
PS 6 - CR 237 / CR 235 - 0.0306 MG - GR121439NoStorage - - Active
PS 5 - HWY 153 N WINGATE - 0.002 MG - HD121441NoStorage - - Active
PS 5 - HWY 153 WINGATE - 0.010 MG - GR121443NoStorage - - Active
PS 6 - CR 237 / CR 235 - 0.004 MG - HD121447NoStorage - - Active
PS 8 - LEMONS GAP - 0.050 MG - GR121449NoStorage - - Active
PS 8 - LEMONS GAP - 0.004 MG - HD121451NoStorage - - Active
PS 8 - LEMONS GAP - 0.001 MG - HD121453NoStorage - - Active
PS 2 - FM 1770 - 0.002 MG - HD127545NoStorage - - Active
INLINE BS - 0.00012 MG - HD127546NoStorage - - Active
PS 7 - BALLINGER WTP - 0.003 MG - HD121445NoStorage - - Inactive
BOOSTER PLANT - PS 2127552NoTreatment Plant - - Active
BOOSTER PLANT - PS 3127553NoTreatment Plant - - Active
  • 1 - 50 of 56

PWS Treatment Processes


Treatment Processes

Facility NameFacility IDTreatment ProcessTreatment Objective
BOOSTER PLANT - PS 2127552ChloraminesDisinfection
BOOSTER PLANT - PS 2127552Hypochlorination, PreDisinfection
BOOSTER PLANT - PS 3127553Hypochlorination, PreDisinfection
BOOSTER PLANT - PS 4127554ChloraminesDisinfection
BOOSTER PLANT - PS 4127554Hypochlorination, PreDisinfection
BOOSTER PLANT - PS 5127555ChloraminesDisinfection
BOOSTER PLANT - PS 5127555Hypochlorination, PreDisinfection
BOOSTER PLANT - PS 6127556ChloraminesDisinfection
BOOSTER PLANT - PS 6127556Hypochlorination, PreDisinfection
BOOSTER PLANT - PS 8127557ChloraminesDisinfection
BOOSTER PLANT - PS 8127557Hypochlorination, PreDisinfection
PLANT - MASTER METER / CITY OF BALLINGER63236ChloraminesDisinfection
PLANT - MASTER METER / CITY OF WINTERS63237ChloraminesDisinfection
PLANT - MASTER METER / CITY OF WINTERS63237Hypochlorination, PreDisinfection
  • 1 - 14 of 14

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.