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Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS IDCA2210503
PWS NameYOSEMITE NPS-YOSEMITE VALLEY
PWS TypeCommunity water system
Owner TypeFederal government
Primary SourceGround water
Primacy TypeState
Is Wholesaler?No
Population Served1000
County ServedMariposa

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
OtherConsumer Confidence Report Complete Failure to ReportConsumer Confidence RuleConsumer Confidence Rule711004Open01-JUL-2025 - No
OtherConsumer Confidence Report Complete Failure to ReportConsumer Confidence RuleConsumer Confidence Rule711003Returned to Compliance01-JUL-2007 - No
MRFollow-up Or Routine LCR Tap M/RLead and Copper RuleLead and Copper Rule511002Returned to Compliance01-JAN-2007 - No
OtherConsumer Confidence Report Complete Failure to ReportConsumer Confidence RuleConsumer Confidence Rule511001Returned to Compliance01-JUL-2005 - No
MRInitial Tap Sampling for Pb and CuLead and Copper RuleLead and Copper Rule94V0001Returned to Compliance30-JUN-199301-MAR-2000No
  • 1 - 5 of 5

Enforcement Actions


Enforcement Actions

Latest Enforcement IDAssociated To Violation IDEnforcement Action Type CodeEnforcement Action DescriptionEnforcement DateOriginator DescriptionEnforcement Comment
9911003711004SFLState Administrative/Compliance Order without penalty issued11-DEC-2025State -
811007711003SOXState Compliance achieved09-NOV-2007StateENF_NO:03-11-07C-012; DISTRIBUTE AND SUBMIT 2006 CCR
711005511002SOXState Compliance achieved02-JAN-2007StateENF_NO:03-11-06C-022; REC'D DATA FOR PAST SAMPLES
811008511001SOXState Compliance achieved14-NOV-2006StateENF_NO:03-11-06C-012; DISTRIBUTE AND SUBMIT 2006 CCR
00E000194V0001EOXFederal Compliance achieved01-MAR-2000ODSWeb -
  • 1 - 5 of 5

PWS Facilities


All Facilities

Facility NameFacility IDIs SourceFacility Type DescriptionWater Type DescriptionAvailability DescriptionFacility Activity Status
WELL 04 - RAW14906YesWell Ground waterPermanentActive
WELL 01 - RAW14941YesWell Ground waterPermanentActive
WELL 02 - RAW14907YesWell Ground waterPermanentActive
DISTRIBUTION SYSTEM28870NoDistribution System/Zone - - Active
WELL 04 - TRT CL2674NoTreatment Plant - - Active
WELL 01 - TRT CL3463NoTreatment Plant - - Active
WELL 02 - TRT CL525NoTreatment Plant - - Active
  • 1 - 7 of 7

PWS Treatment Processes


Treatment Processes

Facility NameFacility IDTreatment ProcessTreatment Objective
WELL 04 - TRT CL2674Hypochlorination, PostDisinfection
WELL 01 - TRT CL3463Hypochlorination, PostDisinfection
WELL 02 - TRT CL525Hypochlorination, PostDisinfection
  • 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.