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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
MR	Monitoring of Treatment (SWTR-Unfilt/GWR)	Ground Water Rule	Groundwater Rule	5431231	Returned to Compliance	01-JUN-2025	30-JUN-2025	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	1359891	Known	25-JUN-1991	24-JUL-1991	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
1360009	5431231	SOX	State Compliance achieved	03-SEP-2025	State	RTC per EPA policy. Alan M., 9/3/25

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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
CC 2 WENTZVILLE MO6010849	107456	Yes	Consecutive Connection	Ground water	Emergency	Active
WELL #13	95346	Yes	Well	Ground water	Permanent	Active
WELL #12	95345	Yes	Well	Ground water	Permanent	Active
WELL #11	95344	Yes	Well	Ground water	Permanent	Active
WELL #10	95343	Yes	Well	Ground water	Permanent	Active
WELL #9	95342	Yes	Well	Ground water	Permanent	Active
WELL # 6	83496	Yes	Well	Ground water	Permanent	Active
WELL # 4	83494	Yes	Well	Ground water	Permanent	Active
WELL # 3	83493	Yes	Well	Ground water	Permanent	Active
WELL #14	110090	Yes	Well	Ground water	Permanent	Active
WELL # 2	83492	Yes	Well	Ground water	Other	Inactive
WELL # 5	83495	Yes	Well	Ground water	Other	Active
SCHOOL RD	83498	Yes	Well	Ground water	Emergency	Inactive
WELL # 7	83497	Yes	Well	Ground water	Emergency	Active
CC 1 ST CHARLES PWSD #2 MO6024530	106089	Yes	Consecutive Connection	Surface water	Permanent	Active
CC 3 MOAM ST LOUIS ST CHARLES MO6010716	109099	Yes	Consecutive Connection	Surface water	Permanent	Active
CC 4 MOAM ST LOUIS ST CHARLES MO6010716	109493	Yes	Consecutive Connection	Surface water	Permanent	Active
CC 5 MOAM ST LOUIS ST CHARLES MO6010716	109494	Yes	Consecutive Connection	Surface water	Permanent	Active
CC 6 MOAM ST LOUIS ST CHARLES MO6010716	109497	Yes	Consecutive Connection	Surface water	Permanent	Active
CC 7 MOAM ST LOUIS ST CHARLES MO6010716	109498	Yes	Consecutive Connection	Surface water	Permanent	Active
CC 8 MOAM ST LOUIS ST CHARLES MO6010716	109499	Yes	Consecutive Connection	Surface water	Permanent	Active
CC 9 MOAM ST LOUIS ST CHARLES MO6010716	109500	Yes	Consecutive Connection	Surface water	Permanent	Active
CC 10 MOAM ST LOUIS ST CHARLES MO6010716	109501	Yes	Consecutive Connection	Surface water	Permanent	Active
CC 11 MOAM ST LOUIS ST CHARLES MO6010716	109502	Yes	Consecutive Connection	Surface water	Permanent	Active
DISTRIBUTION SYSTEM	88035	No	Distribution System/Zone	-	-	Active
WELL #7 BOOSTER PUMP STATION	106093	No	Pump Facility	-	-	Active
THORNBERRY SUBDIVISION PUMP STATION	106094	No	Pump Facility	-	-	Active
WELL #3 BOOSTER PUMP STATION	95621	No	Pump Facility	-	-	Active
CHEMICAL SAMPLES	92888	No	Sampling Station	-	-	Active
500K GAL GROUND ATP STORAGE 1	106091	No	Storage	-	-	Active
2M GAL GROUND ATP STORAGE 2	106092	No	Storage	-	-	Active
500K GAL TOWER @ WELL #4	76961	No	Storage	-	-	Active
400K GAL TOWER @ WELL #3	97173	No	Storage	-	-	Active
500K GAL ELEVATED @ CANNONBALL	97174	No	Storage	-	-	Active
1.5M GAL GROUND TANK @ WELL #5	97175	No	Storage	-	-	Active
1M GAL GROUND TANK NEAR WELL #7	97176	No	Storage	-	-	Active
500K GAL TOWER @ WELL # 6	97177	No	Storage	-	-	Active
STOR TANK	75301	No	Storage	-	-	Inactive
ELEVATED @ SCHOOL RD	97172	No	Storage	-	-	Inactive
WELL # 3	72204	No	Treatment Plant	-	-	Active
WELL # 4	72205	No	Treatment Plant	-	-	Active
WELL # 6	72207	No	Treatment Plant	-	-	Active
WELL # 7	72595	No	Treatment Plant	-	-	Active
TREATMENT PLANT	96785	No	Treatment Plant	-	-	Active
WELL # 2	72203	No	Treatment Plant	-	-	Inactive
WELL # 5	72206	No	Treatment Plant	-	-	Inactive

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Treatment Processes

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Facility Name	Facility ID	Treatment Process	Treatment Objective
WELL # 2	72203	Aeration, Diffused	Taste / odor control
WELL # 2	72203	Gaseous Chlorination, Post	Disinfection
WELL # 2	72203	Ion Exchange	Inorganics removal
WELL # 3	72204	4-Log Treatment of Viruses	Disinfection
WELL # 3	72204	Aeration, Diffused	Taste / odor control
WELL # 3	72204	Gaseous Chlorination, Post	Disinfection
WELL # 3	72204	Ion Exchange	Inorganics removal
WELL # 4	72205	4-Log Treatment of Viruses	Disinfection
WELL # 4	72205	Aeration, Diffused	Taste / odor control
WELL # 4	72205	Gaseous Chlorination, Post	Disinfection
WELL # 4	72205	Ion Exchange	Inorganics removal
WELL # 5	72206	4-Log Treatment of Viruses	Disinfection
WELL # 5	72206	Aeration, Diffused	Taste / odor control
WELL # 5	72206	Gaseous Chlorination, Post	Disinfection
WELL # 5	72206	Ion Exchange	Inorganics removal
WELL # 6	72207	4-Log Treatment of Viruses	Disinfection
WELL # 6	72207	Aeration, Diffused	Taste / odor control
WELL # 6	72207	Gaseous Chlorination, Post	Disinfection
WELL # 6	72207	Ion Exchange	Inorganics removal
WELL # 7	72595	4-Log Treatment of Viruses	Disinfection
WELL # 7	72595	Aeration, Diffused	Taste / odor control
WELL # 7	72595	Gaseous Chlorination, Post	Disinfection
TREATMENT PLANT	96785	4-Log Treatment of Viruses	Disinfection
TREATMENT PLANT	96785	Hypochlorination, Pre	Disinfection
TREATMENT PLANT	96785	Sedimentation	Particulate removal
TREATMENT PLANT	96785	Coagulation	Particulate removal
TREATMENT PLANT	96785	Filtration, Rapid Sand	Particulate removal
TREATMENT PLANT	96785	pH Adjustment, Pre	Softening (hardness removal)
TREATMENT PLANT	96785	Reducing Agent, Sodium Bisulfate	De-chlorination
TREATMENT PLANT	96785	Filtration, Cartridge	Particulate removal
TREATMENT PLANT	96785	Reverse Osmosis	Softening (hardness removal)
TREATMENT PLANT	96785	pH Adjustment, Post	Corrosion control
TREATMENT PLANT	96785	Chloramines	Disinfection

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