Oblong
EPA ID: IL0330150 · 2,321 people served · 2 ZIP codes
ZipCheckup's reading of EPA records for Oblong (IL0330150): no drinking-water violations recorded since 2021. Although compliance varies widely among water utilities nationally, the SDWIS file for Oblong lists no EPA violations for this supplier, whose service area covers 2,321 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Oblong Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Oblong have a median household income of $63,189 and about 13,324 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 76% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Oblong'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.
Wastewater Proximity Note: This service area ranks in the 70th percentile nationally for proximity to wastewater discharge points.
Infrastructure Risk
PFAS in ZIP Codes This System Serves
PFAS ("forever chemicals") have been reported in samples from water systems associated with the ZIP codes in this system's area. These results can come from other water systems serving the same ZIP codes; check the UCMR5 section for any results reported for this system. 6 detections recorded. 2 detections are above the level of a federal PFAS MCL (4 ppt for PFOA and PFOS), with compliance required from 2029.
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
Oblong (EPA ID: IL0330150) is a community water system in Illinois that serves approximately 2,321 people from groundwater sources.
This system provides water to 2 ZIP codes across 2 communities.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0036 mg/L | No | 2025-12-31 |
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
2 of 2 ZIP records with known zones are in EPA Radon Zone 2.
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 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 available EPA compliance records for Oblong (IL0330150) on EPA.gov.
Frequently Asked Questions
Is Oblong water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Oblong 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 Oblong serve?
Oblong serves approximately 2,321 people across 2 ZIP codes in Illinois.
Where does Oblong get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Oblong Water Quality Report, IL. https://zipcheckup.com/water-system/il0330150/
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author = {{ZipCheckup}},
title = {{Oblong Water Quality Report, IL}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/il0330150/}
}