States › Indiana

Indiana Tap Water Quality 2026

EPA drinking water data for 541 cities across Indiana — covering lead levels, violation history, and compliance status.

Systems tracked: 452 Cities covered: 541 Updated: 2026 Q2
A

Indiana earns an A for overall water quality

541 communities across 92 counties and 452 water systems. 97.4% have no open violations.

Median lead where detected: 2.30 ppb
23.3% of systems report lead as not detected — a state filing convention, not a water quality measure
PFAS tested at 46.0% of communities; 8 above the federal limit
Lead reported for 100.0% of communities
97.4% of communities have no open violations
Water Systems
452
Active community systems
Median Lead Level
2.3 ppb
15% of EPA action level
Fully Compliant
97.4%
of systems — no active violations
How we grade states Grades are based on actual EPA enforcement data — MCL violations and lead levels measured against the 15 ppb federal action level. We do not use MCLG-based detections, which are aspirational zero-tolerance goals that would make nearly every state look dangerous. Read our full methodology →

Best & Worst Cities in Indiana

✓ Cleanest Water
New Trenton
Franklin County
2.1 ppb A
Evansville
Vanderburgh County
1.0 ppb A
Gary
Lake County
3.0 ppb A
Muncie
Delaware County
2.0 ppb A
Kokomo
Howard County
2.0 ppb A
Columbus
Bartholomew County
2.7 ppb A
⚠ Needs Attention
St. Joe
DeKalb County
0.0 ppb F
Universal
Vermillion County
1.4 ppb F
Covington
Fountain County
1.8 ppb D
Lanesville
Harrison County
7.1 ppb D
North Webster
Kosciusko County
0.0 ppb D
Zanesville
Wells County
4.9 ppb D

Water Quality by County

92 of 92
Sort:
CountySystemsLead LevelViolationsGrade
Lake County 21 2.7 ppb 0 A
Marion County 15 5.2 ppb 0 A
Porter County 14 3.0 ppb 0 A
Madison County 14 2.0 ppb 0 A
St. Joseph County 11 6.1 ppb 0 B
LaPorte County 11 1.9 ppb 0 A
Kosciusko County 10 2.0 ppb 0 B
Knox County 10 2.5 ppb 0 B
Wayne County 9 3.2 ppb 0 A
Elkhart County 9 1.7 ppb 0 B

About Indiana Drinking Water

Indiana is served by 452 community water systems covering 541 communities across 92 counties. 97.4% have no open violation on record.

Lead was detected in 415 communities, with a median of 2.30 ppb — 15% of the federal action level. A further 126 reported none detected. That share is a state reporting convention rather than a measure of water quality, so it is stated separately rather than averaged in.

PFAS has been tested at 46.0% of communities here, and 8 are above the limits EPA set in 2024. Coverage matters: states that test more find more, so this figure is not comparable with a state that has tested less.

Frequently Asked Questions

Is Indiana tap water safe to drink? ▼
97.4% of communities have no open violation on record. 8 have PFAS above the federal limit set in 2024, which is the main open concern.
Does Indiana have a lead problem? ▼
12 water systems report a 90th-percentile lead result at or above the 15 ppb action level. The action level is a treatment trigger, not a legal maximum, and 126 communities report no detection at all.
How complete is the data for Indiana? ▼
Lead results are reported for 100.0% of communities and PFAS for 46.0%. Where a figure is missing it is shown as not reported rather than assumed safe.
How does Indiana compare with other states? ▼
We do not rank states against each other. Lead reporting completeness ranges from under 20% to 100% depending on the state, so a national ranking would compare filing practice rather than water quality.