Public water system · WY5600205
ActiveShell Town Water Improvement District
At a glance
Shell Town Water Improvement District (PWSID WY5600205) is an active community water system in Big Horn County, Wyoming. It reports serving 120 people through 33 service connections. Its primary water source is purchased groundwater, and EPA lists it as privately owned. EPA's records list 2 violations for this system; none is health-based, and the most recent began in July 2016.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
120
Service connections
33
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Shell Town Water Improvement District compare with other water systems in Big Horn County?
By EPA's size categories, Shell Town Water Improvement District 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 1.2% 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 community water system reports serving 6,703 people, so Shell Town Water Improvement District is well 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. Wyoming has 332 active community water systems, 43% of the state's 775 active systems. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 36 Wyoming systems (4.6%) list purchased groundwater as their primary source.
Who owns and regulates Shell Town Water Improvement District?
EPA lists Shell Town Water Improvement District as privately owned. 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. 9 of the 28 active systems in Big Horn County (32%) are also privately owned.
Does Shell Town Water Improvement District have drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in July 2016. The violations listed here began between January 2001 and July 2016. By type: 1 public notice, recordkeeping or other and 1 monitoring and reporting. The contaminants or rules involved are Consumer Confidence Rule and Lead and Copper Rule. EPA lists 1 as unaddressed and 1 as resolved. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement. 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 |
|---|---|---|---|---|
| 2016-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Unaddressed |
| 2001-01-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
All 2 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.
Shell Town Water Improvement District: frequently asked questions
Who runs Shell Town Water Improvement District?
Shell Town Water Improvement District (PWSID WY5600205) is a community water system privately owned. It is regulated by the WY state drinking water program.
How many people does Shell Town Water Improvement District serve?
Shell Town Water Improvement District reports serving 120 people through 33 service connections in Big Horn County, Wyoming.
Where does Shell Town Water Improvement District get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Shell Town Water Improvement District have any drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in July 2016. 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 Shell Town Water Improvement District'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 2 violations for this system; none is health-based, and the most recent began in July 2016. For current results, consult the system's annual water quality report, EPA ECHO, or the WY state drinking water program.
Where can I find Shell Town Water Improvement District's water quality report?
As a community water system, Shell Town Water Improvement District 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 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, “Shell Town Water Improvement District, PWSID WY5600205, Wyoming”, https://aquacensus.com/water-systems/wyoming/shell-town-water-improvement-district-wy5600205 (data as of October 1, 2026).