Public water system · IA3742004
ActiveJefferson Water Department
At a glance
Jefferson Water Department (PWSID IA3742004) is an active community water system in Greene County, Iowa. It reports serving 4,182 people through 2,080 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 8 violations for this system; 2 are health-based, and the most recent began in April 2020.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
4,182
Service connections
2,080
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Jefferson Water Department compare with other water systems in Greene County?
By EPA's size categories, Jefferson Water Department is a medium system (3,301 to 10,000 people). Greene County has 5 active public water systems, and Jefferson Water Department is the largest of them by population served. Its population served is about 3.6 times the county average of 1,175 people per system, and accounts for 71% of the 5,876 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 Jefferson Water Department is about 38% 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 Jefferson Water Department?
EPA lists Jefferson Water Department 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. 4 of the 5 active systems in Greene County (80%) are also owned by a local government.
Does Jefferson Water Department have drinking water violations?
EPA's records list 8 violations for this system; 2 are health-based, and the most recent began in April 2020. The violations listed here began between July 1992 and April 2020. By type: 6 monitoring and reporting and 2 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 8 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 |
|---|---|---|---|---|
| 2020-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2020-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2019-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitritecode 1041 | No | Resolved |
| 1997-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toluenecode 2991 | No | Resolved |
| 1996-06-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1995-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1995-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1992-07-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
All 8 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.
Jefferson Water Department: frequently asked questions
Who runs Jefferson Water Department?
Jefferson Water Department (PWSID IA3742004) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Jefferson Water Department serve?
Jefferson Water Department reports serving 4,182 people through 2,080 service connections in Greene County, Iowa.
Where does Jefferson Water Department 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 Jefferson Water Department have any drinking water violations?
EPA's records list 8 violations for this system; 2 are health-based, and the most recent began in April 2020. 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 Jefferson Water Department'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 8 violations for this system; 2 are health-based, and the most recent began in April 2020. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Jefferson Water Department's water quality report?
As a community water system, Jefferson Water Department 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 Greene County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Grand Jct Municipal Water Dept | Greene | 725 | Community | Groundwater |
| Scranton Water System | Greene | 511 | Community | Groundwater |
| Churdan Water Supply | Greene | 375 | Community | Purchased groundwater |
| Raccoon River Bible Camp | Greene | 83 | Transient non-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, “Jefferson Water Department, PWSID IA3742004, Iowa”, https://aquacensus.com/water-systems/iowa/jefferson-water-department-ia3742004 (data as of October 1, 2026).