Public water system · MO5211145

Active

Undercliff

At a glance

Undercliff (PWSID MO5211145) is an active transient non-community water system in Newton County, Missouri. It reports serving 150 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in March 2026.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

150

Service connections

Primary source

Groundwater

System type

TNCWS

Transient non-community water system

System record

PWSIDMO5211145

System typeTransient non-community water system

Activity statusActive

Population served150

Service connections1

Primary water sourceGroundwater

Owner typePrivate

Primacy agencyMO state drinking water program

City served—

StateMissouri

ZIP—

CountyNewton County

How does Undercliff compare with other water systems in Newton County?

By EPA's size categories, Undercliff is a very small system (500 people or fewer). Newton County has 37 active public water systems. Its population served is well below the county average of 615 people per system, and accounts for 0.7% of the 22,743 people reported by systems filed under the county. Across Missouri, the 2,943 active systems average 2,049 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Undercliff is roughly in line with that figure.

What does “transient non-community water system” mean?

A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. Missouri has 1,103 active transient non-community water systems, 37% of the state's 2,943 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,521 Missouri systems (86%) list groundwater as their primary source.

Who owns and regulates Undercliff?

EPA lists Undercliff as privately owned. 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. 27 of the 37 active systems in Newton County (73%) are also privately owned.

Does Undercliff have drinking water violations?

Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in March 2026. The violations listed here began between June 2019 and March 2026. By type: 10 monitoring and 2 public notice, recordkeeping or other. The contaminant or rule involved most often is Revised Total Coliform Rule (10 of them). EPA lists 10 as resolved, 1 as archived and 1 as unaddressed. 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. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.

Began	Violation	Contaminant or rule	Health-based	Status
2026-03-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Archived
2025-05-31	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Unaddressed
2024-04-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2023-09-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2023-07-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2020-11-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2020-09-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2020-07-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2020-06-27	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2020-05-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2020-03-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2019-06-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved

The 12 most recent 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.

Undercliff: frequently asked questions

Who runs Undercliff?

Undercliff (PWSID MO5211145) is a transient non-community water system privately owned. It is regulated by the MO state drinking water program.

How many people does Undercliff serve?

Undercliff reports serving 150 people through 1 service connection in Newton County, Missouri.

Where does Undercliff get its water?

EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.

Does Undercliff have any drinking water violations?

Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in March 2026. 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 Undercliff's 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. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in March 2026. For current results, consult EPA ECHO, or the MO state drinking water program.

Where can I find Undercliff's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Undercliff is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.

Other water systems in Newton County

Water system	County	Population served	Type	Source
Neosho Pws	Newton	12,157	Community	Surface water
Seneca Pws	Newton	2,390	Community	Groundwater
Granby Pws	Newton	2,034	Community	Groundwater
Church of God Monark Springs Campground	Newton	1,000	Transient non-community	Groundwater
Diamond Pws	Newton	926	Community	Groundwater
Petro Stopping Center	Newton	900	Non-transient non-community	Groundwater

Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.

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, “Undercliff, PWSID MO5211145, Missouri”, https://aquacensus.com/water-systems/missouri/undercliff-mo5211145 (data as of October 1, 2026).