States › Illinois › Will County

Will County, IL Water Quality

Water quality data for 30 public water systems serving Will County, Illinois — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 30 water systems · 38 cities
✅
Generally Safe — Most Systems Performing Well

The majority of water systems have no active violations and lead levels well below the federal action level.

B

Will County Earns a B

Will County: 38 communities across 30 water systems. 94.7% have no open violations.

  • Median lead where detected: 1.72 ppb
  • 20 communities with a lead detection, 18 reporting none detected
  • 2 communities with PFAS above the federal limit
  • 29 with significant inspection deficiencies
  • 94.7% of communities have no open violations
1.72 ppb
Median Lead Level
County-wide, 90th percentile
30
Water Systems
Active CWS & NTNCWS
94%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Bolingbrook
    Not detected
    No federal limits exceeded on record
    A
  • Homer Glen
    Not detected
    No federal limits exceeded on record
    A
  • Mokena
    Not detected
    No federal limits exceeded on record
    A
  • Manhattan
    1.60 ppb
    No federal limits exceeded on record
    B
  • Peotone
    Not detected
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Crest Hill
    1.23 ppb
    PFAS above the limit at 3 of 7 sampling points
    F
  • Preston Heights
    Not detected
    1 violation currently open
    D
  • Ingalls Park
    3.79 ppb
    1 violation currently open
    D
  • Channahon
    Not detected
    PFAS above the limit at 1 of 3 sampling points
    C
  • Rockdale
    1.25 ppb
    Copper above the 1,300 ppb action level
    B
County Lead Level — Median 1.72 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.72 ppb — 11.5% of the federal action level
Systems by Lead Level
Under 5 ppb
15
5 – 10 ppb
5
No Data
18

All Cities in Will County

Joliet 6.47 ppb B
Bolingbrook Not detected A
Plainfield Not detected A
Romeoville 8.22 ppb B
New Lenox Not detected A
Lockport 1.01 ppb B
Homer Glen Not detected A
Frankfort 0.98 ppb B
Shorewood Not detected A
Mokena Not detected A
Crest Hill 1.23 ppb F
Channahon Not detected C
Frankfort Square 0.98 ppb B
Steger 1.84 ppb B
Crete 2.60 ppb A
Manhattan 1.60 ppb B
University Park Not detected B
Braidwood Not detected A
Wilmington 4.99 ppb B
Monee Not detected A
Beecher Not detected B
Peotone Not detected A
Ridgewood 6.47 ppb B
Fairmont 6.47 ppb B
Preston Heights Not detected D
Elwood Not detected B
Rockdale 1.25 ppb B
Willowbrook 1.00 ppb A
Ingalls Park 3.79 ppb D
Bonnie Brae 1.01 ppb B
Arbury Hills Not detected B
Crystal Lawns 6.47 ppb B
Lockport Heights 1.01 ppb B
Plum Valley 1.00 ppb A
Sunnyland Not detected B
Godley Not detected B
Lakewood Shores Not detected B
Goodenow 2.60 ppb A
Showing 38 cities
No active violations Active violations

About Will County Drinking Water

Will County is served by 30 water systems covering 38 communities. 95% have no open violations.

Of the communities reporting lead results, 20 recorded a detection, with a median of 1.72 ppb — 11% of the federal action level. 18 reported none detected, which means below the laboratory limit rather than an absence of lead.

2 of 38 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded significant deficiencies at 29 of them.

Frequently Asked Questions

Is Will County tap water safe to drink?▼
95% of communities have no open violation. 2 of 38 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Will County?▼
Among communities with a detection the median is 1.72 ppb, 11% of the 15 ppb action level. 18 reported none detected and 0 reported no result.
How many water systems serve Will County?▼
30 community water systems serve 38 communities here.
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