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Community Water System · PWS MO4010003

Caledonia PWS

Caledonia, Missouri 63631-0000 - drinking water served from groundwater sources to 130 people, tracked in EPA SDWIS and UCMR5.

130
People served
83
EPA violations
12
Health-based
Untested
UCMR5 result

The verdict

EPA records 83 drinking-water violations at Caledonia PWS, 14% of them health-based - above the Missouri per-system average.

83
Total EPA violations on record
14%
Health-based (MCL / treatment failure)
130
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Caledonia PWS

Caledonia PWS is a local-owned community water system that delivers drinking water to 130 residents in Caledonia, Missouri (Washington County) through 68 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 83 total violations for this system , of which 12 (14%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 57 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Consumer Confidence Rule, recorded in 12 violations (Other). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Missouri, EPA tracks 2,823 public water systems serving 5,855,885 people, with 201,695 cumulative violations and 54,821 health-based violations on record. About 95% of systems in the state carry at least one violation, and state-wide the average per system is 71.4 violations. Statewide, 71 of 230 UCMR5-tested systems have reported PFAS detections (30.9%).

Caledonia PWS's 83 violations sit above the Missouri average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
130
Total Violations
83
Health-Based Violations
12
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
68
County
Washington
School/Daycare
No
MCL Violations
12
Monitoring Violations
57
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Consumer Confidence Rule Other 12 2024
Coliform (TCR) MCL 12 2009
Coliform (TCR) MR 6 2009
Revised Total Coliform Rule MON 4 2021
Lead and Copper Rule MR 3 2001
1,1,1-Trichloroethane MR 2 1993
1,1-Dichloroethylene MR 2 1993
Benzene MR 2 1993
Carbon tetrachloride MR 2 1993
cis-1,2-Dichloroethylene MR 2 1993
CHLOROBENZENE MR 2 1993
o-Dichlorobenzene MR 2 1993
p-Dichlorobenzene MR 2 1993
Tetrachloroethylene MR 2 1993
Toluene MR 2 1993
trans-1,2-Dichloroethylene MR 2 1993
Trichloroethylene MR 2 1993
Vinyl chloride MR 2 1993
Xylenes, Total MR 2 1993
1,1,2-Trichloroethane MR 2 1993
1,2,4-Trichlorobenzene MR 2 1993
Styrene MR 2 1993
1,2-Dichloroethane MR 2 1993
Ethylbenzene MR 2 1993
1,2-Dichloropropane MR 2 1993
DICHLOROMETHANE MR 2 1993
Nitrate-Nitrite MR 1 1997
Gross Alpha, Excl. Radon and U MR 1 1993

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Caledonia PWS.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID MO4010003 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Missouri Drinking Water Authority

Missouri DNR, Public Drinking Water Branch is the primacy agency that licenses and inspects Caledonia PWS under EPA-delegated authority.

Open MO regulator portal

Source: Missouri DNR, Public Drinking Water Branch

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2024 Consumer Confidence Rule Other 12 SDWIS / MO4010003 / 7000
2021 Revised Total Coliform Rule MON 4 SDWIS / MO4010003 / 8000
2009 Coliform (TCR) MCL 12 SDWIS / MO4010003 / 3100
2009 Coliform (TCR) MR 6 SDWIS / MO4010003 / 3100
2001 Lead and Copper Rule MR 3 SDWIS / MO4010003 / 5000
1997 Nitrate-Nitrite MR 1 SDWIS / MO4010003 / 1038
1993 1,1,1-Trichloroethane MR 2 SDWIS / MO4010003 / 2981
1993 1,1-Dichloroethylene MR 2 SDWIS / MO4010003 / 2977
1993 Benzene MR 2 SDWIS / MO4010003 / 2990
1993 Carbon tetrachloride MR 2 SDWIS / MO4010003 / 2982
1993 cis-1,2-Dichloroethylene MR 2 SDWIS / MO4010003 / 2380
1993 CHLOROBENZENE MR 2 SDWIS / MO4010003 / 2989
1993 o-Dichlorobenzene MR 2 SDWIS / MO4010003 / 2968
1993 p-Dichlorobenzene MR 2 SDWIS / MO4010003 / 2969
1993 Tetrachloroethylene MR 2 SDWIS / MO4010003 / 2987

How Caledonia PWS Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Caledonia PWS Missouri avg Federal benchmark
Total violations 83 71.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 12 19.4 Indicates a contaminant exceeded a federal MCL
PFAS detection None 30.9% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 130 2,074 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,823 regulated public water systems in Missouri.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Caledonia PWS water safe to drink? ▼
Caledonia PWS (PWS ID: MO4010003) has 83 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 130 people using Groundwater sources.
How many people does Caledonia PWS serve? ▼
Caledonia PWS serves 130 people in Caledonia, Missouri. It is a Local-owned system using Groundwater water sources with 68 service connections.
What type of violations does Caledonia PWS have? ▼
Caledonia PWS has 83 total violations: 12 health-based violations (MCL exceedances or treatment failures), 57 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Caledonia PWS water? ▼
No PFAS testing data is available for Caledonia PWS under the EPA's UCMR5 monitoring program.
What water source does Caledonia PWS use? ▼
Caledonia PWS uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.