Public water system · CO0201417
ActiveJohnson Auto Plaza
At a glance
Johnson Auto Plaza (PWSID CO0201417) is an active non-transient non-community water system in Adams County, Colorado. It reports serving 247 people through 5 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in May 2020.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
247
Service connections
5
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Johnson Auto Plaza compare with other water systems in Adams County?
By EPA's size categories, Johnson Auto Plaza is a very small system (500 people or fewer). Adams County has 82 active public water systems. Its population served is well below the county average of 8,669 people per system, and accounts for less than 0.1% of the 710,822 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 Johnson Auto Plaza is about 43% below 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 Johnson Auto Plaza?
EPA lists Johnson Auto Plaza as privately owned. 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. 62 of the 82 active systems in Adams County (76%) are also privately owned.
Does Johnson Auto Plaza have drinking water violations?
EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in May 2020. The violations listed here began between January 2001 and May 2020. By type: 3 monitoring and reporting, 1 monitoring 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 5 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 |
|---|---|---|---|---|
| 2020-05-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2020-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2010-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2007-04-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2001-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
All 5 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.
Johnson Auto Plaza: frequently asked questions
Who runs Johnson Auto Plaza?
Johnson Auto Plaza (PWSID CO0201417) is a non-transient non-community water system privately owned. It is regulated by the CO state drinking water program.
How many people does Johnson Auto Plaza serve?
Johnson Auto Plaza reports serving 247 people through 5 service connections in Adams County, Colorado.
Where does Johnson Auto Plaza 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 Johnson Auto Plaza have any drinking water violations?
EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in May 2020. 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 Johnson Auto Plaza'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 5 violations for this system; 1 is health-based, and the most recent began in May 2020. For current results, consult EPA ECHO, or the CO state drinking water program.
Where can I find Johnson Auto Plaza's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Johnson Auto Plaza 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 Adams County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Thornton City of | Adams | 226,465 | Community | Surface water |
| Westminster City of | Adams | 202,078 | Community | Surface water |
| South Adams County Wsd | Adams | 75,559 | Community | Purchased surface water |
| Brighton City of | Adams | 56,304 | Community | Purchased surface water |
| Northglenn City of | Adams | 48,927 | Community | Surface water |
| Crestview Wsd | Adams | 23,756 | 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, “Johnson Auto Plaza, PWSID CO0201417, Colorado”, https://aquacensus.com/water-systems/colorado/johnson-auto-plaza-co0201417 (data as of October 1, 2026).