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Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS IDCO0101150
PWS NameTHORNTON CITY OF
PWS TypeCommunity water system
Owner TypeLocal government
Primary SourceSurface water
Primacy TypeState
Is Wholesaler?No
Population Served226465
County ServedAdams

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
MRMonitoring, Turbidity (Enhanced SWTR)Interim and Long Term 1 Enhanced Surface Water Treatment RuleInterim Enhanced Surface Water Treatment Rule1135Returned to Compliance01-NOV-202330-NOV-2023No
MRMonitoring, Turbidity (Enhanced SWTR)Interim and Long Term 1 Enhanced Surface Water Treatment RuleInterim Enhanced Surface Water Treatment Rule1134Returned to Compliance01-OCT-202331-OCT-2023No
MRMonitoring, Turbidity (Enhanced SWTR)Interim and Long Term 1 Enhanced Surface Water Treatment RuleInterim Enhanced Surface Water Treatment Rule1133Returned to Compliance01-SEP-202330-SEP-2023No
MRFollow-up Or Routine LCR Tap M/RLead and Copper RuleLead and Copper Rule1132Returned to Compliance01-JUL-2023 - No
MRMonitoring, RegularRadionuclides and Revised Rad RuleGross Alpha, Excl. Radon and U1129Returned to Compliance01-APR-202230-JUN-2022No
MRMonitoring, RegularRadionuclides and Revised Rad RuleCombined Radium (-226 and -228)1127Returned to Compliance01-APR-202230-JUN-2022No
MRMonitoring, RegularRadionuclides and Revised Rad RuleCombined Uranium1128Returned to Compliance01-APR-202230-JUN-2022No
MRMonitoring, Turbidity (Enhanced SWTR)Interim and Long Term 1 Enhanced Surface Water Treatment RuleInterim Enhanced Surface Water Treatment Rule1061Returned to Compliance01-MAY-202131-MAY-2021No
MRWater Quality Parameter M/RLead and Copper RuleLead and Copper Rule993Returned to Compliance01-JUL-201031-DEC-2010No
MRMonitoring, RegularSynthetic Organic ChemicalsDiquat990Returned to Compliance01-JAN-200831-DEC-2010No
MRMonitoring, Turbidity (Enhanced SWTR)Interim and Long Term 1 Enhanced Surface Water Treatment RuleInterim Enhanced Surface Water Treatment Rule104Returned to Compliance01-SEP-200330-SEP-2003No
  • 1 - 11 of 11

Enforcement Actions

Enforcement Actions

Latest Enforcement IDAssociated To Violation IDEnforcement Action Type CodeEnforcement Action DescriptionEnforcement DateOriginator DescriptionEnforcement Comment
1431135SIFState Public Notification received28-JUN-2024StatePN performed with 2024 CCR. MM 6/28/2024
1431134SIFState Public Notification received28-JUN-2024StatePN performed with 2024 CCR. MM 6/28/2024
1431133SIFState Public Notification received28-JUN-2024StatePN performed with 2024 CCR. MM 6/28/2024
1431132SIFState Public Notification received28-JUN-2024StatePN performed with 2024 CCR. MM 6/28/2024
1321128SOXState Compliance achieved29-AUG-2022State -
1321129SOXState Compliance achieved29-AUG-2022State -
1321127SOXState Compliance achieved29-AUG-2022State -
1251061SIFState Public Notification received26-MAY-2022State -
117990SOXState Compliance achieved09-OCT-2012StateCompliant samples rcvd (1Q2012 & 3Q2012).
116993SOXState Compliance achieved30-JUN-2011State -
109104SOXState Compliance achieved25-AUG-2008Staterec'd 0708, sv 8/25/08
  • 1 - 11 of 11

PWS Facilities

All Facilities

Facility NameFacility IDIs SourceFacility Type DescriptionWater Type DescriptionAvailability DescriptionFacility Activity Status
STANDLEY LAKE CLEAR CREEK19YesIntakeSurface waterPermanentActive
E GRAVEL LAKES FROM SOUTH PLATTE RIVER21YesIntakeSurface waterPermanentActive
W GRAVEL LAKES FROM LOWER CLEAR CREEK20YesIntakeSurface waterPermanentActive
DISTRIBUTION SYSTEM6387NoDistribution System/Zone - - Active
ZONE 3A PUMP STATION17778NoPump Facility - - Active
HOLLY ST PUMP STATION17779NoPump Facility - - Active
ZONE 2 PUMP STATION17780NoPump Facility - - Active
ZONE 3 AND 4 PUMP STATION17781NoPump Facility - - Active
COMBINED RAW SOURCE WES BROWN PLANT14064NoSampling Station - - Active
COMBINED RAW SOURCE THORNTON PLANT14065NoSampling Station - - Active
ZONE 2 NORTH TANK13081NoStorage - - Active
WESTERN HILLS TANK13082NoStorage - - Active
140TH AND COLORADO TANK13083NoStorage - - Active
CHEROKEE TANK13084NoStorage - - Active
102ND AVE ELEVATED TANK13085NoStorage - - Active
84TH AND ZUNI ELEVATED TANK13086NoStorage - - Active
THORNTON PLANT TANK 213739NoStorage - - Active
136TH AND GARFIELD TANK17777NoStorage - - Active
THORNTON PLANT CLEARWELL 121855NoStorage - - Active
ZONE 2 SOUTH TANK21857NoStorage - - Active
WES BROWN PLANT CLEARWELL21858NoStorage - - Active
DENVER INTERCONNECT13080NoTransmission Main (Manifold) - - Active
THORNTON WATER TREATMENT PLANT23291NoTreatment Plant - - Active
EAST GRAVEL LAKES NO. 4 PUMP STATION25873NoTreatment Plant - - Active
WEST GRAVEL LAKES PUMP STATION25874NoTreatment Plant - - Active
WES BROWN TREATMENT PLANT3289NoTreatment Plant - - Active
THORNTON CONVENTIONAL SWTP023290NoTreatment Plant - - Inactive
  • 1 - 27 of 27

PWS Treatment Processes

Treatment Processes

Facility NameFacility IDTreatment ProcessTreatment Objective
THORNTON WATER TREATMENT PLANT23291FlocculationParticulate removal
THORNTON WATER TREATMENT PLANT23291Ozonation, PreTaste / odor control
THORNTON WATER TREATMENT PLANT23291SedimentationParticulate removal
THORNTON WATER TREATMENT PLANT23291Filtration, Rapid SandParticulate removal
THORNTON WATER TREATMENT PLANT23291Hypochlorination, PostDisinfection
THORNTON WATER TREATMENT PLANT23291InnovativeDisinfection
THORNTON WATER TREATMENT PLANT23291PermanganateIron removal
THORNTON WATER TREATMENT PLANT23291CoagulationParticulate removal
THORNTON WATER TREATMENT PLANT23291InnovativeParticulate removal
THORNTON WATER TREATMENT PLANT23291PeroxideTaste / odor control
THORNTON WATER TREATMENT PLANT23291InnovativeDisinfection
THORNTON WATER TREATMENT PLANT23291ChloraminesDisinfection
EAST GRAVEL LAKES NO. 4 PUMP STATION25873PermanganateIron removal
EAST GRAVEL LAKES NO. 4 PUMP STATION25873PermanganateManganese removal
WEST GRAVEL LAKES PUMP STATION25874PermanganateIron removal
WEST GRAVEL LAKES PUMP STATION25874PermanganateManganese removal
WES BROWN TREATMENT PLANT3289InnovativeCorrosion control
WES BROWN TREATMENT PLANT3289ChloraminesDisinfection
WES BROWN TREATMENT PLANT3289Hypochlorination, PostDisinfection
WES BROWN TREATMENT PLANT3289InnovativeDisinfection
WES BROWN TREATMENT PLANT3289Ultraviolet RadiationDisinfection
WES BROWN TREATMENT PLANT3289PermanganateIron removal
WES BROWN TREATMENT PLANT3289Filtration, UltrafiltrationParticulate removal
WES BROWN TREATMENT PLANT3289CoagulationParticulate removal
WES BROWN TREATMENT PLANT3289InnovativeParticulate removal
WES BROWN TREATMENT PLANT3289InnovativeParticulate removal
WES BROWN TREATMENT PLANT3289Activated Carbon, PowderedTaste / odor control
THORNTON CONVENTIONAL SWTP023290Gaseous Chlorination, PreDisinfection
THORNTON CONVENTIONAL SWTP023290CoagulationParticulate removal
THORNTON CONVENTIONAL SWTP023290InnovativeParticulate removal
THORNTON CONVENTIONAL SWTP023290Activated Carbon, PowderedTaste / odor control
THORNTON CONVENTIONAL SWTP023290Rapid MixParticulate removal
THORNTON CONVENTIONAL SWTP023290FlocculationParticulate removal
THORNTON CONVENTIONAL SWTP023290SedimentationParticulate removal
THORNTON CONVENTIONAL SWTP023290Filtration, Rapid SandParticulate removal
THORNTON CONVENTIONAL SWTP023290Gaseous Chlorination, PostDisinfection
THORNTON CONVENTIONAL SWTP023290ChloraminesDisinfection
THORNTON CONVENTIONAL SWTP023290PermanganateManganese removal
  • 1 - 38 of 38
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.