Public water system · IA1286042
ActiveShell Rock Muni Water Supp
At a glance
Shell Rock Muni Water Supp (PWSID IA1286042) is an active community water system in Butler County, Iowa. It reports serving 1,269 people through 544 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 November 1992.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,269
Service connections
544
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Shell Rock Muni Water Supp compare with other water systems in Butler County?
By EPA's size categories, Shell Rock Muni Water Supp is a small system (501 to 3,300 people). Butler County has 16 active public water systems, and Shell Rock Muni Water Supp is the 2nd-largest of them by population served. Its population served is about twice the county average of 586 people per system, and accounts for 14% of the 9,368 people reported by systems filed under the county. Across Iowa, the 1,828 active systems average 1,718 people each. Nationally, the average active community water system reports serving 6,703 people, so Shell Rock Muni Water Supp 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. Iowa has 1,084 active community water systems, 59% of the state's 1,828 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,502 Iowa systems (82%) list groundwater as their primary source.
Who owns and regulates Shell Rock Muni Water Supp?
EPA lists Shell Rock Muni Water Supp as owned by a local government. The IA 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 16 active systems in Butler County (56%) are also owned by a local government.
Does Shell Rock Muni Water Supp have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in November 1992. By type: 1 monitoring and reporting. The contaminant or rule involved is Total coliform bacteria (TCR). 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 |
|---|---|---|---|---|
| 1992-11-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | 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.
Shell Rock Muni Water Supp: frequently asked questions
Who runs Shell Rock Muni Water Supp?
Shell Rock Muni Water Supp (PWSID IA1286042) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Shell Rock Muni Water Supp serve?
Shell Rock Muni Water Supp reports serving 1,269 people through 544 service connections in Butler County, Iowa.
Where does Shell Rock Muni Water Supp 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 Shell Rock Muni Water Supp 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 November 1992. 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 Rock Muni Water Supp'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 November 1992. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Shell Rock Muni Water Supp's water quality report?
As a community water system, Shell Rock Muni Water Supp 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 Butler County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Parkersburg Water Supply | Butler | 2,019 | Community | Groundwater |
| Clarksville Water Supply | Butler | 1,254 | Community | Groundwater |
| Aplington Water Supply | Butler | 1,126 | Community | Groundwater |
| Greene Muni Water Supply | Butler | 994 | Community | Groundwater |
| Allison Water Supply | Butler | 966 | Community | Groundwater |
| Dumont Water Supply | Butler | 635 | Community | Groundwater |
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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 Rock Muni Water Supp, PWSID IA1286042, Iowa”, https://aquacensus.com/water-systems/iowa/shell-rock-muni-water-supp-ia1286042 (data as of October 1, 2026).