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Water system · PWSID IL0370100

DEKALB

DEKALB, IL · ~45,000 people served

Check your exact address → DEKALB overview
100
Excellent
PurityRadar safety score

PWSID

IL0370100

State

Illinois

City

DEKALB

Population served

45,000

Primary source

Groundwater

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

Latest detections from EPA’s UCMR5 monitoring (through Oct 2023). Levels in parts per trillion (ppt).

Lithium

16,000 ppt

limit —

No federal limit

Violations & enforcement

11

Violations on record

0

Unaddressed

4

Health-based

73

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Nov 2025. Official EPA record →

Other · EPA contaminant 7000 began Jul 2025 Resolved
Monitoring & reporting · Uranium began Jan 2022 Resolved
Monitoring · Lead & Copper Rule began Jun 2018 Resolved
Monitoring & reporting · EPA contaminant 0999 began Apr 2018 Resolved
Monitoring & reporting · Uranium began Jan 2011 Resolved
Max contaminant level (MCL) · Uranium health-based began Dec 1998 Resolved
Max contaminant level (MCL) · Uranium health-based began Jan 1995 Resolved
Max contaminant level (MCL) · Uranium health-based began Dec 1994 Resolved
Monitoring & reporting · Lead & Copper Rule began Apr 1992 Resolved
Max contaminant level (MCL) · Uranium health-based began Dec 1990 Resolved
Monitoring & reporting · Gross alpha began Jun 1977 Resolved

Recent enforcement actions

  • State action · SOX Nov 2025
  • State action · SIA Sep 2025
  • State action · SIF Jan 2024
  • State action · SOX Feb 2023
  • State action · SIA Feb 2023
  • State action · SIA Feb 2023
  • State action · SIF Mar 2019
  • State action · SIF Mar 2019

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Arsenic

1 station · latest Jul 2021

0.535 · max 0.99 ug/L · 4

Manganese

1 station · latest Jul 2021

14.6 · max 20.8 ug/L · 4

Fluoride

1 station · latest Jul 2021

0.195 · max 0.2 mg/L · 2

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system IL0370100 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.