Public water system · CO0230043
ActiveMarshdale Elem School
At a glance
Marshdale Elem School (PWSID CO0230043) is an active non-transient non-community water system in Jefferson County, Colorado. It reports serving 920 people through 2 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2026.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
920
Service connections
2
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Marshdale Elem School compare with other water systems in Jefferson County?
By EPA's size categories, Marshdale Elem School is a small system (501 to 3,300 people). Jefferson County has 112 active public water systems. Its population served is well below the county average of 5,159 people per system, and accounts for 0.2% of the 577,783 people reported by systems filed under the county. Across Colorado, the 2,207 active systems average 3,400 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Marshdale Elem School is about twice that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Colorado has 183 active non-transient non-community water systems, 8.3% of the state's 2,207 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,437 Colorado systems (65%) list groundwater as their primary source.
Who owns and regulates Marshdale Elem School?
EPA lists Marshdale Elem School as owned by a local government. The CO state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 39 of the 112 active systems in Jefferson County (35%) are also owned by a local government.
Does Marshdale Elem School have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2026. By type: 1 public notice, recordkeeping or other. The contaminant or rule involved is Public Notice. EPA lists 1 as resolved. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2026-01-15 | Public notice, recordkeeping or otherPublic Notification Violation without NPDWR Violation · code 76 | Public Noticecode 7500 | No | Resolved |
The one violation in EPA's records.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.
Marshdale Elem School: frequently asked questions
Who runs Marshdale Elem School?
Marshdale Elem School (PWSID CO0230043) is a non-transient non-community water system owned by a local government. It is regulated by the CO state drinking water program.
How many people does Marshdale Elem School serve?
Marshdale Elem School reports serving 920 people through 2 service connections in Jefferson County, Colorado.
Where does Marshdale Elem School 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 Marshdale Elem School have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in January 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 Marshdale Elem School'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. EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2026. For current results, consult EPA ECHO, or the CO state drinking water program.
Where can I find Marshdale Elem School's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Marshdale Elem School is a non-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 Jefferson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Arvada City of | Jefferson | 171,610 | Community | Surface water |
| Consolidated Mutual Maple Grove | Jefferson | 81,400 | Community | Surface water |
| Green Mountain Wsd | Jefferson | 49,400 | Community | Purchased surface water |
| Bancroft Clover Wsd | Jefferson | 44,000 | Community | Purchased surface water |
| Golden City of | Jefferson | 38,288 | Community | Surface water |
| Bear Creek Wsd | Jefferson | 30,000 | 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, “Marshdale Elem School, PWSID CO0230043, Colorado”, https://aquacensus.com/water-systems/colorado/marshdale-elem-school-co0230043 (data as of October 1, 2026).