Jefferson Water Department
EPA ID: IA3742004 · 4,182 people served · 3 ZIP codes
ZipCheckup's reading of EPA records for Jefferson Water Department (IA3742004): no drinking-water violations recorded since 2021. Across the monitored periods in available EPA data, Jefferson Water Department has no violations listed for its service population of 4,182.
Data: EPA SDWIS
Service Area Map
Coverage area for Jefferson Water Department Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Jefferson Water Department have a median household income of $70,625 and about 6,574 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 84% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: On average, 33% of census tracts in the counties mapped to this service area are designated disadvantaged by the federal Climate and Economic Justice Screening Tool (CEJST, 2022 version). Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
💧 Where Does Your Water Come From?
Jefferson Water Department's water is classified in EPA records as a groundwater source. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in Iowa
System Overview
Jefferson Water Department (EPA ID: IA3742004) is a community water system in Iowa that serves approximately 4,182 people from groundwater sources.
This system provides water to 3 ZIP codes across 3 communities.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0008 mg/L | No | 2025-12-31 |
The accepted LCR snapshot contains 1 reported copper action-level exceedance record for this PWSID. The source does not provide a verified copper level for publication.
Radon Risk in Service Area
3 of 3 ZIP records with known zones are in EPA Radon Zone 1.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by IA or modeled from parcel and building-footprint data.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Jefferson Water Department (IA3742004) on EPA.gov.
Frequently Asked Questions
Is Jefferson Water Department water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Jefferson Water Department in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does Jefferson Water Department serve?
Jefferson Water Department serves approximately 4,182 people across 3 ZIP codes in Iowa.
Where does Jefferson Water Department get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: No PFAS Reported Above Reporting Levels
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were reported above UCMR5 minimum reporting levels.
EPA's April 2024 PFAS rule sets MCLs of 4 ppt for PFOA and PFOS and 10 ppt for PFHxS, PFNA and HFPO-DA (GenX); water systems must comply from 2029. Other PFAS compounds have no individual federal MCL. A state standard is shown only where this system's state has its own enforceable PFAS limit. Detection results are EPA UCMR5 samples, not a measurement at your tap.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Jefferson Water Department Water Quality Report, IA. https://zipcheckup.com/water-system/ia3742004/
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title = {{Jefferson Water Department Water Quality Report, IA}},
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url = {https://zipcheckup.com/water-system/ia3742004/}
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