Public water system · WY5601009
ActiveBighorn Nf-Tyrrell Work Center
At a glance
Bighorn Nf-Tyrrell Work Center (PWSID WY5601009) is an active transient non-community water system in Big Horn County, Wyoming. It reports serving 30 people through 12 service connections. Its primary water source is groundwater, and EPA lists it as owned by the federal government. EPA's records list 8 violations for this system; 2 are health-based, and the most recent began in August 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
30
Service connections
12
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Bighorn Nf-Tyrrell Work Center compare with other water systems in Big Horn County?
By EPA's size categories, Bighorn Nf-Tyrrell Work Center is a very small system (500 people or fewer). Big Horn County has 28 active public water systems. Its population served is well below the county average of 371 people per system, and accounts for 0.3% of the 10,387 people reported by systems filed under the county. Across Wyoming, the 775 active systems average 838 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Bighorn Nf-Tyrrell Work Center is well below 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. Wyoming has 352 active transient non-community water systems, 45% of the state's 775 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 585 Wyoming systems (75%) list groundwater as their primary source.
Who owns and regulates Bighorn Nf-Tyrrell Work Center?
EPA lists Bighorn Nf-Tyrrell Work Center as owned by the federal government. The WY state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 6 of the 28 active systems in Big Horn County (21%) are also owned by the federal government.
Does Bighorn Nf-Tyrrell Work Center have drinking water violations?
EPA's records list 8 violations for this system; 2 are health-based, and the most recent began in August 2023. The violations listed here began between October 1991 and August 2023. By type: 4 monitoring and reporting, 2 monitoring and 2 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 6 as resolved and 2 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. 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 |
|---|---|---|---|---|
| 2023-08-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2017-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2017-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitrate-Nitritecode 1038 | No | Resolved |
| 2014-09-02 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 2011-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2002-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1995-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1991-10-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
All 8 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.
Bighorn Nf-Tyrrell Work Center: frequently asked questions
Who runs Bighorn Nf-Tyrrell Work Center?
Bighorn Nf-Tyrrell Work Center (PWSID WY5601009) is a transient non-community water system owned by the federal government. It is regulated by the WY state drinking water program.
How many people does Bighorn Nf-Tyrrell Work Center serve?
Bighorn Nf-Tyrrell Work Center reports serving 30 people through 12 service connections in Big Horn County, Wyoming.
Where does Bighorn Nf-Tyrrell Work Center 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 Bighorn Nf-Tyrrell Work Center have any drinking water violations?
EPA's records list 8 violations for this system; 2 are health-based, and the most recent began in August 2023. 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 Bighorn Nf-Tyrrell Work Center'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 8 violations for this system; 2 are health-based, and the most recent began in August 2023. For current results, consult EPA ECHO, or the WY state drinking water program.
Where can I find Bighorn Nf-Tyrrell Work Center's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Bighorn Nf-Tyrrell Work Center 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 Big Horn County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Lovell, Town of | Big Horn | 2,250 | Community | Purchased surface water |
| Greybull, Town of | Big Horn | 2,080 | Community | Groundwater |
| Basin, Town of | Big Horn | 1,250 | Community | Purchased groundwater |
| South Big Horn County Jpb | Big Horn | 900 | Community | Groundwater |
| Cowley, Town of | Big Horn | 800 | Community | Groundwater |
| Byron, Town of | Big Horn | 561 | 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, “Bighorn Nf-Tyrrell Work Center, PWSID WY5601009, Wyoming”, https://aquacensus.com/water-systems/wyoming/bighorn-nf-tyrrell-work-center-wy5601009 (data as of October 1, 2026).