Here is what the EPA's own data shows about tap water in North Chicago. According to EPA SDWIS data retrieved July 2026, North Chicago is served by 1 active community water system, together reported to serve about 16,813 people.
As of July 2026, EPA records show 21 violations across the community water system(s) serving North Chicago, going back to the earliest EPA record. 9 of these are classified by the EPA as health-based (a contaminant recorded above the limit the EPA tracks); the rest are monitoring or reporting violations. Each is listed by system below, with its status.
Health-based Di(2-ethylhexyl) phthalate: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 3 times in April 2024. The EPA record lists a level of 8 UG/L; the limit (MCL) is 6 UG/L. EPA records do not show all of these as returned to compliance.
Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 6 times in April 2023. The EPA record lists a level of 0.083 MG/L; the limit (MCL) is 0.08 MG/L. EPA records do not show all of these as returned to compliance.
Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 6 times between April 1993 and July 2025. EPA records do not show all of these as returned to compliance.
Monitoring Consumer Confidence Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in July 2025. EPA records do not show all of these as returned to compliance.
Monitoring Public Notice: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 3 times in June 2024. All have since returned to compliance, per EPA records.
Monitoring TTHM: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in February 2019. All have since returned to compliance, per EPA records.
Monitoring Total Haloacetic Acids (HAA5): a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in February 2019. All have since returned to compliance, per EPA records.
What this means
A health-based violation means a contaminant was recorded above the limit the EPA tracks for it. A monitoring or reporting violation means a required test or report was late or missed — not that a contaminant was measured above a limit. “Returned to compliance” means the EPA recorded the issue as resolved.
This page summarizes the EPA's own records and does not assess whether your water is safe to drink. For the most current details, you can verify every record directly with the EPA, and contact your water system with questions.
Source: U.S. EPA Envirofacts SDWIS, retrieved July 2026. Records cover the EPA's full reporting history for these systems. Verify at EPA ECHO.