Public Water System

NORTH CHICAGO

PWSID IL0971250 · Illinois · 16,813 people served

Failing

NORTH CHICAGO is an EPA-regulated public water system in Illinois (PWSID IL0971250). It serves an estimated 16,813 residents — a small city of customers — across 1 community across 1 ZIP code.

Over the past five years, NORTH CHICAGO has recorded 12 EPA health-based violations. The grade of F summarizes this compliance pattern. Specific contaminants, dates, and rule citations are listed in the violation history below.

Service Area

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Centered on the averaged ZIP-code centroid of 1 ZIP served.

Population

16,813

Cities

ZIPs

Violations

EPA Health-Based Violations

Health-based Maximum Contaminant Level (MCL) violations on file for NORTH CHICAGO over the past five years of EPA SDWIS reporting.

Atrazinechemical

EPA Code 2039 · Maximum Contaminant Level Exceedance

violations

EPA Limit

0.003 mg/L

Last Reading

8 UG/L

First Reported

Apr 2024

Most Recent

Apr 2024

What this violation means

Atrazine is one of the most widely used herbicides in US agriculture, primarily on corn and sorghum. Spring runoff from farm fields creates seasonal spikes in atrazine levels in surface water sources across the Midwest. Long-term exposure is linked to hormone disruption and reproductive effects.

Recommended precautions

→Granular activated carbon removes atrazine — most carbon filters work.
→Reverse osmosis provides additional protection.
→Atrazine spikes are seasonal — utilities monitor quarterly averages, but acute exposure can occur in spring.

Read the complete guide to Atrazine

Total Trihalomethanes (TTHMs)disinfectant

EPA Code 2950 · Maximum Contaminant Level Exceedance

violations

EPA Limit

0.08 mg/L

Last Reading

.083 MG/L

First Reported

Apr 2023

Most Recent

Apr 2023

What this violation means

Total Trihalomethanes (TTHMs) form when chlorine reacts with naturally occurring organic matter — leaves, soil, algae — in source water. They are among the most commonly reported violations because utilities pulling from surface water (rivers, lakes, reservoirs) struggle to balance disinfection with byproduct formation. Long-term exposure has been linked to bladder cancer and adverse pregnancy outcomes.

Recommended precautions

→Activated carbon filters (pitcher, faucet, or under-sink) effectively reduce TTHMs.
→Letting water sit uncovered allows TTHMs to off-gas — leave a pitcher in the fridge for several hours.
→Shower with the bathroom fan on; TTHMs can volatilize into the air during hot showers.
→Boiling reduces TTHMs through volatilization, but only after extended boiling.

Read the complete guide to Total Trihalomethanes (TTHMs)

Source: EPA Safe Drinking Water Information System (SDWIS). Health-based violations only. Older violations may have been resolved; check your utility's most recent Consumer Confidence Report for current status.

Cities Served by NORTH CHICAGO

NORTH CHICAGO

ZIP Codes Served

60064

About this system

EPA records this system as PWSID IL0971250. Data reflects the most recent EPA SDWIS publication as of 2026-05-18. Public Water System Identifiers (PWSIDs) are assigned by the EPA's Safe Drinking Water Act program to track every regulated water utility in the United States. The first two letters typically indicate the state primacy agency. For real-time water quality information, contact NORTH CHICAGO directly or review their annual Consumer Confidence Report (CCR).