Tapcensus

Schaumburg

Community water system in Schaumburg, Cook County, Illinois, serving 75,750 people from surface water purchased. 1 rule violated in the past three years. Owned by local government. System ID IL0314890.

People served 75,750 surface water purchased
Rules violated, past 3 years 1 one rule can carry several violations
Unresolved 0 rules still in violation, EPA data updated Oct 7, 2026
Quarters with violations 4 of the last 12 quarters

Quarterly compliance history

–Q4
2023
–Q1
2024
VQ2
2024
VQ3
2024
VQ4
2024
VQ1
2025
–Q2
2025
–Q3
2025
–Q4
2025
–Q1
2026
–Q2
2026
–Q3
2026
UQ4
2026
–No violation identified VViolation identified SSerious violator (EPA enforcement priority) UUndetermined Oldest quarter on the left. Quarters 1 to 12 are the twelve most recently completed quarters at EPA's last data refresh; the 13th is the current quarter up to that date, which EPA reports as undetermined.

Rules violated in the past three years

Oct to Dec 2023 to Oct to Dec 2026

Diquat

Diquat is a broad-spectrum contact herbicide used to control aquatic weeds, algae, and terrestrial vegetation.
EPA rule code 2032 · Pesticide

What it means: Diquat is a broad-spectrum contact herbicide used to control aquatic weeds, algae, and terrestrial vegetation. It remains in active use in the United States, applied directly to water bodies and irrigation canals. Diquat binds tightly to soil but can enter surface water directly during aquatic applications.

Health effects: Chronic exposure to diquat is associated with cataracts and kidney damage in animal studies. Acute high-level exposure causes gastrointestinal distress. EPA has not classified diquat as a human carcinogen. Individuals with kidney conditions may be at elevated risk from chronic exposure.

Limit: 0.02 mg/L (20 ppb)

About this contaminant
About this data

EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several in the same period. Unresolved means still in violation at EPA's latest data refresh. Measured contaminant levels are not part of this record; each system publishes them in its annual Consumer Confidence Report.

Service area from EPA's Public Water System Service Area Boundaries dataset. The system's location is the centre of the service area EPA publishes for the system.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Illinois records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.