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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.

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Violations

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Violation Category Code	Violation Type Description	Rule Name	Contaminant Name	Violation ID	Compliance Status Description	Compliance Period Begin Date	Compliance Period End Date	Is Health Based Ind
MON	Monitoring, Lab Certification/Method Error (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	711002	Returned to Compliance	01-APR-2025	31-MAY-2025	No
TT	Single Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	711001	Returned to Compliance	01-FEB-2007	28-FEB-2007	Yes

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Enforcement Actions

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Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
711004	711002	SOX	State Compliance achieved	15-SEP-2025	State	-
711002	711001	SOX	State Compliance achieved	16-MAR-2007	State	RTC'ed in 2018 as part of SDWIS Clean up week

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All Facilities

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Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
SONORA - PURCHASED TREATED	33986	Yes	Consecutive Connection	Surface water	Other	Inactive
MARBLE QUARRY WELL - RAW	14783	Yes	Well	Ground water	Permanent	Inactive
MAIN PLANT WELL - ABANDONED	8184	Yes	Well	Ground water	Other	Inactive
SPRINGFIELD WELL 05 - INACTIVE	24492	Yes	Well	Ground water	Other	Inactive
COLUMBIA COUNTRY ESTATES WELL - INACTIVE	23688	Yes	Well	Ground water	Other	Inactive
SPRINGFIELD WELL 04 - INACTIVE	23687	Yes	Well	Ground water	Other	Inactive
GIBBS RANCH WELL 01 - INACTIVE	23652	Yes	Well	Ground water	Other	Inactive
GIBBS RANCH WELL 02 - DESTROYED	19884	Yes	Well	Ground water	Other	Inactive
COLUMBIA DITCH RAW	58727	Yes	Intake	Surface water	Permanent	Active
MATELOT DITCH - RAW	33984	Yes	Intake	Surface water	Permanent	Active
PLANT INTAKE - ABANDONED	33985	Yes	Intake	Surface water	Other	Inactive
DISTRIBUTION SYSTEM	33983	No	Distribution System/Zone	-	-	Active
COLUMBIA WTP - TREATED	4058	No	Treatment Plant	-	-	Active
COLUMBIA DITCH TREATED	58728	No	Treatment Plant	-	-	Active
MARBLE QUARRY WELL - TREATED	4045	No	Treatment Plant	-	-	Inactive

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Treatment Processes

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Facility Name	Facility ID	Treatment Process	Treatment Objective
MARBLE QUARRY WELL - TREATED	4045	Filtration, Greensand	Iron removal
MARBLE QUARRY WELL - TREATED	4045	Permanganate	Iron removal
MARBLE QUARRY WELL - TREATED	4045	Hypochlorination, Pre	Iron removal
COLUMBIA WTP - TREATED	4058	Filtration, Rapid Sand	Particulate removal
COLUMBIA WTP - TREATED	4058	Sedimentation	Particulate removal
COLUMBIA WTP - TREATED	4058	Flocculation	Particulate removal
COLUMBIA WTP - TREATED	4058	Rapid Mix	Particulate removal
COLUMBIA WTP - TREATED	4058	Coagulation	Particulate removal
COLUMBIA WTP - TREATED	4058	Gaseous Chlorination, Post	Disinfection
COLUMBIA WTP - TREATED	4058	Gaseous Chlorination, Pre	Disinfection
COLUMBIA DITCH TREATED	58728	Hypochlorination, Post	Disinfection
COLUMBIA DITCH TREATED	58728	Filtration, Pressure Sand	Particulate removal
COLUMBIA DITCH TREATED	58728	Rapid Mix	Particulate removal
COLUMBIA DITCH TREATED	58728	Flocculation	Particulate removal
COLUMBIA DITCH TREATED	58728	Sedimentation	Radionuclides removal

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