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Assumption, IL Tap Water Quality 2026

Water quality report for Assumption, IL — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Assumption's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Assumption PWSID: IL0210050 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead was not detected and no violations are open. PFAS has never been sampled at this system.

B

Assumption earns a B for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: not detected
PFAS never sampled at this system
20 violations since 2015, 4 health-based
No violations currently open
Assumption's lead level vs. all Illinois community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of Illinois utilities
Population Served
1145
~622 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
20 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
0% of EPA action level
Not detected
Action level: 15 ppb
Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
TTHM MONITORING AND REPORTING — 0.080 mg/L 2026 Archived
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2026 Archived
TTHM MONITORING AND REPORTING — 0.080 mg/L 2025 Unaddressed
Public Notice OTHER — — 2025 Unaddressed
Public Notice OTHER — — 2025 Unaddressed
Public Notice OTHER — — 2025 Unaddressed
Public Notice OTHER — — 2025 Unaddressed
LEAD AND COPPER RULE REVISIONS TREATMENT TECHNIQUE — — 2024 Resolved
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2024 Resolved
TTHM MCL EXCEEDANCE 0.081 MG/L 0.080 mg/L 2024 Resolved
Nitrate MONITORING AND REPORTING — 10 mg/L 2024 Resolved
Nitrate MONITORING AND REPORTING — 10 mg/L 2024 Resolved
Nitrate MONITORING AND REPORTING — 10 mg/L 2024 Resolved
Public Notice OTHER — — 2024 Resolved
TTHM MCL EXCEEDANCE 0.091 MG/L 0.080 mg/L 2024 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2023 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
Consumer Confidence Rule OTHER — — 2020 Resolved
Nitrate MCL EXCEEDANCE 11 MG/L 10 mg/L 2019 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

20 violations are on record since 2015, of which 4 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Assumption
PWSID IL0210050
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 1,145
Service connections 622
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Assumption tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Assumption water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Assumption? ▼
Assumption (PWSID IL0210050). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-02-25. No significant deficiencies were recorded.

What Should Assumption Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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