Public water system · IA0790074
ActiveWaterloo Water Works
At a glance
Waterloo Water Works (PWSID IA0790074) is an active community water system in Black Hawk County, Iowa. It reports serving 69,504 people through 27,430 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in November 2015.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
69,504
Service connections
27,430
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Waterloo Water Works compare with other water systems in Black Hawk County?
By EPA's size categories, Waterloo Water Works is a large system (10,001 to 100,000 people). Black Hawk County has 18 active public water systems, and Waterloo Water Works is the largest of them by population served. Its population served is about 10 times the county average of 6,856 people per system, and accounts for 56% of the 123,407 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 Waterloo Water Works is about 10 times 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 Waterloo Water Works?
EPA lists Waterloo Water Works 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. 10 of the 18 active systems in Black Hawk County (56%) are also owned by a local government.
Does Waterloo Water Works have drinking water violations?
Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in November 2015. The violations listed here began between January 1992 and November 2015. By type: 9 monitoring and reporting and 3 contaminant level above the legal limit. The contaminant or rule involved most often is Nitrate (4 of them). EPA lists 11 as resolved and 1 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 |
|---|---|---|---|---|
| 2015-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 2007-06-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2005-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 1996-05-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1996-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1-Dichloroethylenecode 2977 | No | Resolved |
| 1996-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1-Dichloroethylenecode 2977 | No | Resolved |
| 1996-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1-Dichloroethylenecode 2977 | No | Resolved |
| 1993-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1993-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1992-02-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1992-01-01 | Monitoring and reportingWater Quality Parameter M/R · code 53 | Lead and Copper Rulecode 5000 | No | Archived |
| 1992-01-01 | Monitoring and reportingWater Quality Parameter M/R · code 53 | Lead and Copper Rulecode 5000 | No | Resolved |
The 12 most recent 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.
Waterloo Water Works: frequently asked questions
Who runs Waterloo Water Works?
Waterloo Water Works (PWSID IA0790074) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Waterloo Water Works serve?
Waterloo Water Works reports serving 69,504 people through 27,430 service connections in Black Hawk County, Iowa.
Where does Waterloo Water Works 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 Waterloo Water Works have any drinking water violations?
Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in November 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 Waterloo Water Works' 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. Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in November 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 Waterloo Water Works' water quality report?
As a community water system, Waterloo Water Works 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 Black Hawk County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Cedar Falls Municipal Water Utilities | Black Hawk | 40,713 | Community | Groundwater |
| Evansdale Water Works | Black Hawk | 4,561 | Community | Groundwater |
| Hudson Water Supply | Black Hawk | 2,546 | Community | Purchased groundwater |
| La Porte City Utilities | Black Hawk | 2,284 | Community | Groundwater |
| Elk Run Heights Water Supply | Black Hawk | 1,069 | Community | Purchased groundwater |
| Dunkerton Muni Water Supply | Black Hawk | 842 | 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, “Waterloo Water Works, PWSID IA0790074, Iowa”, https://aquacensus.com/water-systems/iowa/waterloo-water-works-ia0790074 (data as of October 1, 2026).