Monticello
EPA ID: IL1470350 · 5,548 people served · 1 ZIP code
ZipCheckup's reading of EPA records for Monticello (IL1470350): no drinking-water violations recorded since 2021. EPA monitoring records reviewed for Monticello list no violations. That describes the federal file only, not a test of the water at any tap, for a utility that reports serving approximately 5,548 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Monticello Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Monticello have a median household income of $94,841 and about 8,110 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 60% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Monticello'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 Illinois
System Overview
Monticello (EPA ID: IL1470350) is a community water system in Illinois that serves approximately 5,548 people from groundwater sources.
This system serves ZIP code 61856 in Monticello.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| Below the reporting limit | 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
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 IL or modeled from parcel and building-footprint data.
- 61856 - Monticello
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Monticello (IL1470350) on EPA.gov.
Frequently Asked Questions
Is Monticello water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Monticello 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 Monticello serve?
Monticello serves approximately 5,548 people across 1 ZIP code in Illinois.
Where does Monticello 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.). Monticello Water Quality Report, IL. https://zipcheckup.com/water-system/il1470350/
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title = {{Monticello Water Quality Report, IL}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/il1470350/}
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