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Zionsville, IN Tap Water Quality 2026

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

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

Main Utility: Citizens Water - Indianapolis PWSID: IN5249004 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 5.18 ppb, 35% of the action level and no violations are open. No PFAS was detected.

A

Zionsville earns an A for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 5.18 ppb — 35% of the federal action level
PFAS tested, none detected
1 violations since 2015, 0 health-based
No violations currently open
Zionsville's lead level vs. all Indiana community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 5.18 ppb — 35% of the federal action level
✓ Lower lead than 18% of Indiana utilities
Population Served
25375
~352138 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
1 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
35% of EPA action level
5.18 ppb
Action level: 15 ppb
The 90th-percentile lead result is 5.18 ppb, 35% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2020 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

1 violations are on record since 2015, of which 0 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Citizens Water - Indianapolis
PWSID IN5249004
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 25,375
Service connections 352,138
Systems serving this area 6
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Zionsville tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 5.18 ppb, 35% of the action level.
Does Zionsville water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Zionsville? ▼
Citizens Water - Indianapolis (PWSID IN5249004), one of 6 systems serving this area. Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2026-02-18. No significant deficiencies were recorded.

What Should Zionsville Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
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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