Onawa Municipal Water Plant
EPA ID: IA6739095 · 2,906 people served · 1 ZIP code
ZipCheckup's reading of EPA records for Onawa Municipal Water Plant (IA6739095): no drinking-water violations recorded since 2021. Checked against the EPA violation database, Onawa Municipal Water Plant returns no entries for its service territory of 2,906 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Onawa Municipal Water Plant Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Onawa Municipal Water Plant have a median household income of $60,642 and about 3,388 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 81% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Onawa Municipal Water Plant'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
Onawa Municipal Water Plant (EPA ID: IA6739095) is a community water system in Iowa that serves approximately 2,906 people from groundwater sources.
This system serves ZIP code 51040 in Onawa.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.002 mg/L | No | 2024-12-31 |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Radon Risk in Service Area
1 of 1 ZIP records with known zones is 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.
- 51040 - Onawa
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Onawa Municipal Water Plant (IA6739095) on EPA.gov.
Frequently Asked Questions
Is Onawa Municipal Water Plant water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Onawa Municipal Water Plant 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 Onawa Municipal Water Plant serve?
Onawa Municipal Water Plant serves approximately 2,906 people across 1 ZIP code in Iowa.
Where does Onawa Municipal Water Plant 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.). Onawa Municipal Water Plant Water Quality Report, IA. https://zipcheckup.com/water-system/ia6739095/
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