Public water system · IA4115092
ActiveCrystal Lake Water Supply
At a glance
Crystal Lake Water Supply (PWSID IA4115092) is an active community water system in Hancock County, Iowa. It reports serving 255 people through 147 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; 3 are health-based, and the most recent began in October 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
255
Service connections
147
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Crystal Lake Water Supply compare with other water systems in Hancock County?
By EPA's size categories, Crystal Lake Water Supply is a very small system (500 people or fewer). Hancock County has 18 active public water systems, and Crystal Lake Water Supply is the 6th-largest of them by population served. Its population served is about 41% below the county average of 431 people per system, and accounts for 3.3% of the 7,764 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 Crystal Lake Water Supply 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 Crystal Lake Water Supply?
EPA lists Crystal Lake Water Supply 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 18 active systems in Hancock County (50%) are also owned by a local government.
Does Crystal Lake Water Supply have drinking water violations?
EPA's records list 4 violations for this system; 3 are health-based, and the most recent began in October 2022. The violations listed here began between October 1996 and October 2022. By type: 3 contaminant level above the legal limit and 1 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 4 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 |
|---|---|---|---|---|
| 2022-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitritecode 1041 | Yes | Resolved |
| 1996-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1996-11-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1996-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 4 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.
Crystal Lake Water Supply: frequently asked questions
Who runs Crystal Lake Water Supply?
Crystal Lake Water Supply (PWSID IA4115092) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Crystal Lake Water Supply serve?
Crystal Lake Water Supply reports serving 255 people through 147 service connections in Hancock County, Iowa.
Where does Crystal Lake Water Supply 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 Crystal Lake Water Supply have any drinking water violations?
EPA's records list 4 violations for this system; 3 are health-based, and the most recent began in October 2022. 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 Crystal Lake Water Supply'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 4 violations for this system; 3 are health-based, and the most recent began in October 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Crystal Lake Water Supply's water quality report?
As a community water system, Crystal Lake Water Supply 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 Hancock County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Garner Water Works | Hancock | 3,065 | Community | Groundwater |
| Britt Water Works | Hancock | 2,064 | Community | Groundwater |
| Kanawha Water Supply | Hancock | 658 | Community | Groundwater |
| Klemme Water Works | Hancock | 441 | Community | Groundwater |
| Corwith Water Supply | Hancock | 266 | Community | Groundwater |
| Woden Water Supply | Hancock | 188 | 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, “Crystal Lake Water Supply, PWSID IA4115092, Iowa”, https://aquacensus.com/water-systems/iowa/crystal-lake-water-supply-ia4115092 (data as of October 1, 2026).