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Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS IDCA5010033
PWS NameCITY OF MODESTO - GRAYSON
PWS TypeCommunity water system
Owner TypeLocal government
Primary SourceGround water
Primacy TypeState
Is Wholesaler?No
Population Served914
County ServedStanislaus

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, Single SampleNitrate RuleNitrate310007Returned to Compliance01-JUN-200330-JUN-2003Yes
MCLMaximum Contaminant Level Violation, Single SampleNitrate RuleNitrate9910005Returned to Compliance01-DEC-199831-DEC-1998Yes
MCLMaximum Contaminant Level Violation, Single SampleNitrate RuleNitrate9810004Returned to Compliance01-DEC-199731-DEC-1997Yes
MCLMaximum Contaminant Level Violation, AverageNitrate RuleNitrate9510003Returned to Compliance01-JUL-199531-DEC-1995Yes
MCLMaximum Contaminant Level Violation, AverageNitrate RuleNitrate9510002Returned to Compliance01-APR-199530-JUN-1995Yes
MCLMaximum Contaminant Level Violation, Monthly (TCR)Total Coliform RuleColiform (TCR)9310001Returned to Compliance01-APR-199330-APR-1993Yes
  • 1 - 6 of 6

Enforcement Actions


Enforcement Actions

Latest Enforcement IDAssociated To Violation IDEnforcement Action Type CodeEnforcement Action DescriptionEnforcement DateOriginator DescriptionEnforcement Comment
99100139510003SOXState Compliance achieved16-JUL-2019State -
99100129510002SOXState Compliance achieved16-JUL-2019State -
710018310007SOXState Compliance achieved11-JUL-2003StateENF_NO:03-10-03C-003; COMPLIED WITH CITATION PUBLIC NOTIFICATION PROVIDED
1100139910005SFLState Administrative/Compliance Order without penalty issued11-MAY-2001StateENF_NO:03-10-01CO-001; NITRATE MCL EXCEEDENCES PROVIDE PLAN/SCHEDULE FOR SOLUTION.
99E00019810004EOXFederal Compliance achieved23-FEB-1998ODSWeb -
99100119310001SOXState Compliance achieved30-MAY-1993StateThis TCR violation has been closed with this SOX enforcement record due to rTCR implementation on 4/1/2016.
  • 1 - 6 of 6

PWS Facilities


All Facilities

Facility NameFacility IDIs SourceFacility Type DescriptionWater Type DescriptionAvailability DescriptionFacility Activity Status
WELL 274 - INACTIVE14037YesWell Ground waterOtherInactive
WELL 69 - RAW73920YesWell Ground waterPermanentActive
WELL 295 - RAW14038YesWell Ground waterPermanentActive
DISTRIBUTION SYSTEM33406NoDistribution System/Zone - - Active
WELL 295 - TREATED - IX - NO32113NoTreatment Plant - - Active
WELLS 69 & 295 BLENDED5705NoTreatment Plant - - Active
WELL 69 - TREATED - IX - NITRATE74689NoTreatment Plant - - Active
WELL 274 - TREATED - INACTIVE2115NoTreatment Plant - - Inactive
  • 1 - 8 of 8

PWS Treatment Processes


Treatment Processes

Facility NameFacility IDTreatment ProcessTreatment Objective
WELL 295 - TREATED - IX - NO32113Activated Carbon, GranularOrganics removal
WELL 295 - TREATED - IX - NO32113Ion ExchangeInorganics removal
WELL 274 - TREATED - INACTIVE2115Hypochlorination, PostDisinfection
WELL 274 - TREATED - INACTIVE2115Ion ExchangeInorganics removal
WELLS 69 & 295 BLENDED5705Rapid MixParticulate removal
  • 1 - 5 of 5

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.