Public water system · MO6010359
ActiveHerculaneum Pws
At a glance
Herculaneum Pws (PWSID MO6010359) is an active community water system in Jefferson County, Missouri. It reports serving 5,000 people through 1,966 service connections. Its primary water source is purchased groundwater under influence, and EPA lists it as owned by a local government. EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in July 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
5,000
Service connections
1,966
Primary source
GUP
Purchased groundwater under influence
System type
CWS
Community water system
System record
How does Herculaneum Pws compare with other water systems in Jefferson County?
By EPA's size categories, Herculaneum Pws is a medium system (3,301 to 10,000 people). Jefferson County has 92 active public water systems. Its population served is about 146% above the county average of 2,034 people per system, and accounts for 2.7% of the 187,106 people reported by systems filed under the county. Across Missouri, the 2,943 active systems average 2,049 people each. Nationally, the average active community water system reports serving 6,703 people, so Herculaneum Pws is about 25% below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Missouri has 1,612 active community water systems, 55% of the state's 2,943 active systems. Purchased groundwater under the influence of surface water means the system buys that kind of water from another public water system. 2 Missouri systems (less than 0.1%) list purchased groundwater under influence as their primary source.
Who owns and regulates Herculaneum Pws?
EPA lists Herculaneum Pws as owned by a local government. The MO state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 26 of the 92 active systems in Jefferson County (28%) are also owned by a local government.
Does Herculaneum Pws have drinking water violations?
EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in July 2025. The violations listed here began between December 1998 and July 2025. By type: 3 monitoring and reporting, 1 reporting, 1 public notice, recordkeeping or other and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 4 as resolved, 1 as unaddressed and 1 as archived. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-07-02 | ReportingNotification, Known or Potential LSL · code 4H | Lead and Copper Rule Revisionscode 5200 | No | Unaddressed |
| 2008-04-01 | Monitoring and reportingMonitoring, Routine (IDSE) · code 30 | Stage 2 Disinfectants and Disinfection Byproducts Rulecode 0600 | No | Resolved |
| 2006-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2003-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2001-11-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1998-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
All 6 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Herculaneum Pws: frequently asked questions
Who runs Herculaneum Pws?
Herculaneum Pws (PWSID MO6010359) is a community water system owned by a local government. It is regulated by the MO state drinking water program.
How many people does Herculaneum Pws serve?
Herculaneum Pws reports serving 5,000 people through 1,966 service connections in Jefferson County, Missouri.
Where does Herculaneum Pws get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater under influence. Purchased groundwater under the influence of surface water means the system buys that kind of water from another public water system.
Does Herculaneum Pws have any drinking water violations?
EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in July 2025. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Herculaneum Pws' water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the MO state drinking water program.
Where can I find Herculaneum Pws' water quality report?
As a community water system, Herculaneum Pws must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Jefferson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Jefferson Co Cons Pwsd C 1 | Jefferson | 37,000 | Community | Purchased surface water |
| Jefferson County Pwsd 1 | Jefferson | 21,113 | Community | Purchased surface water |
| Jefferson County Pwsd 3 | Jefferson | 17,000 | Community | Purchased surface water |
| Jefferson County Pwsd 2 | Jefferson | 16,548 | Community | Surface water |
| Festus Pws | Jefferson | 13,000 | Community | Purchased groundwater under influence |
| Jefferson County Pwsd 10 | Jefferson | 10,000 | Community | Purchased surface water |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Herculaneum Pws, PWSID MO6010359, Missouri”, https://aquacensus.com/water-systems/missouri/herculaneum-pws-mo6010359 (data as of October 1, 2026).