Onarga
EPA ID: IL0750700 · 1,409 people served · 2 ZIP codes
ZipCheckup's reading of EPA SDWIS for Onarga (IL0750700): 5 EPA violations in the last five years. 5 total violations across five years at Onarga - every finding closed, utility compliant today, 1,409 served.
Data: EPA SDWIS
Service Area Map
Coverage area for Onarga Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Onarga serves a community with a median household income of $69,584 and an estimated 3,954 residents across its service area. Approximately 84% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 33% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. 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?
Onarga's water is pumped from underground aquifers. 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
Detected Contaminants
How Onarga compares to EPA limits
What This Means For You
Lead and Copper Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Stage 1 DBP Rule at 1 mg/L exceeds the EPA maximum of mg/L.
Consumer Confidence Report Rule at 1 mg/L exceeds the EPA maximum of mg/L.
Revised Total Coliform Rule at 1 presence exceeds the EPA maximum of presence.
Comparable Water Systems
Similar-sized systems in Illinois
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Onarga (EPA ID: IL0750700) is a community water system in Illinois that serves approximately 1,409 people from groundwater sources.
This system provides water to 2 ZIP codes across 2 communities.
Violation History
Status breakdown for accepted records with record years 2021-2026: 5 resolved, 0 archived, 0 addressed, and 0 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| October 16, 2024 | Lead and Copper Rule | Non-health-based | Resolved |
| October 16, 2024 | Lead and Copper Rule | Non-health-based | Resolved |
| August 1, 2023 | Consumer Confidence Report Rule | Non-health-based | Resolved |
| July 1, 2023 | Revised Total Coliform Rule | Non-health-based | Resolved |
| July 1, 2021 | Stage 1 DBP Rule | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Lead and Copper Rule | Treatment Failure | 2 | No |
| Stage 1 DBP Rule | Treatment Failure | 1 | No |
| Consumer Confidence Report Rule | Reporting Failure | 1 | No |
| Revised Total Coliform Rule | Microbiological | 1 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0 mg/L | No | N/A |
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.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
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 IL 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 the full compliance record for Onarga (IL0750700) on EPA.gov.
Frequently Asked Questions
Is Onarga water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Onarga; its 5 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Onarga serve?
Onarga serves approximately 1,409 people across 2 ZIP codes in Illinois.
Where does Onarga get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Onarga (IL): 5 EPA Violations. https://zipcheckup.com/water-system/il0750700/
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title = {{Onarga (IL): 5 EPA Violations}},
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url = {https://zipcheckup.com/water-system/il0750700/}
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What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Onarga (EPA ID: IL0750700) - request the latest Consumer Confidence Report or ask about specific contaminants.