Public water system · IA8166061
ActiveWall Lake Water Supply
At a glance
Wall Lake Water Supply (PWSID IA8166061) is an active community water system in Sac County, Iowa. It reports serving 780 people through 465 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 9 violations for this system; 4 are health-based, and the most recent began in July 2015.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
780
Service connections
465
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Wall Lake Water Supply compare with other water systems in Sac County?
By EPA's size categories, Wall Lake Water Supply is a small system (501 to 3,300 people). Sac County has 9 active public water systems, and Wall Lake Water Supply is the 5th-largest of them by population served. Its population served is about 17% below the county average of 944 people per system, and accounts for 9.2% of the 8,496 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 Wall 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 Wall Lake Water Supply?
EPA lists Wall 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. 8 of the 9 active systems in Sac County (89%) are also owned by a local government.
Does Wall Lake Water Supply have drinking water violations?
EPA's records list 9 violations for this system; 4 are health-based, and the most recent began in July 2015. The violations listed here began between August 1979 and July 2015. By type: 5 monitoring and reporting and 4 contaminant level above the legal limit. The contaminant or rule involved most often is Nitrate (5 of them). EPA lists 6 as resolved and 3 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 |
|---|---|---|---|---|
| 2015-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | Yes | Resolved |
| 1996-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1995-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2,4-Trichlorobenzenecode 2378 | No | Resolved |
| 1995-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Lindane (gamma-BHC)code 2010 | No | Resolved |
| 1994-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1987-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1985-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Archived |
| 1979-08-11 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Seleniumcode 1045 | Yes | Archived |
| 1979-08-10 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Seleniumcode 1045 | Yes | Archived |
All 9 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.
Wall Lake Water Supply: frequently asked questions
Who runs Wall Lake Water Supply?
Wall Lake Water Supply (PWSID IA8166061) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Wall Lake Water Supply serve?
Wall Lake Water Supply reports serving 780 people through 465 service connections in Sac County, Iowa.
Where does Wall 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 Wall Lake Water Supply have any drinking water violations?
EPA's records list 9 violations for this system; 4 are health-based, and the most recent began in July 2015. 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 Wall 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 9 violations for this system; 4 are health-based, and the most recent began in July 2015. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Wall Lake Water Supply's water quality report?
As a community water system, Wall 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 Sac County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Sac City Municipal Water Plant | Sac | 2,093 | Community | Groundwater |
| West Central Rwa-Boyer System | Sac | 1,715 | Community | Groundwater |
| Lake View Water Supply | Sac | 1,133 | Community | Groundwater |
| Odebolt Water Supply | Sac | 994 | Community | Groundwater |
| Schaller Water Supply | Sac | 729 | Community | Groundwater |
| Early Municipal Water Supply | Sac | 587 | 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, “Wall Lake Water Supply, PWSID IA8166061, Iowa”, https://aquacensus.com/water-systems/iowa/wall-lake-water-supply-ia8166061 (data as of October 1, 2026).