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Grinnell, IA Tap Water Quality 2026

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

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

Main Utility: Grinnell Water Department PWSID: IA7930008 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 3.10 ppb, 21% of the action level and no violations are open. No PFAS was detected.

B

Grinnell earns a B for water quality

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

Lead: 3.10 ppb — 21% of the federal action level
PFAS tested, none detected
18 violations since 2015, 13 health-based
No violations currently open
Grinnell's lead level vs. all Iowa community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 3.10 ppb — 21% of the federal action level
✓ Lower lead than 30% of Iowa utilities
Population Served
9553
~3600 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
18 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
21% of EPA action level
3.10 ppb
Action level: 15 ppb
The 90th-percentile lead result is 3.10 ppb, 21% 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
Combined Radium (-226 and -228) MCL EXCEEDANCE 8.13 PCI/L 5 pCi/L 2026 Archived
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.79 PCI/L 5 pCi/L 2025 Archived
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2025 Archived
Combined Radium (-226 and -228) MONITORING AND REPORTING — 5 pCi/L 2025 Archived
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.4 PCI/L 5 pCi/L 2025 Archived
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 22 PCI/L 15 pCi/L 2025 Archived
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.45 PCI/L 5 pCi/L 2025 Archived
Public Notice OTHER — — 2024 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.325 PCI/L 5 pCi/L 2024 Archived
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 21.8 PCI/L 15 pCi/L 2024 Archived
Combined Radium (-226 and -228) MCL EXCEEDANCE 7.94 PCI/L 5 pCi/L 2024 Archived
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 20.5 PCI/L 15 pCi/L 2024 Archived
Combined Radium (-226 and -228) MCL EXCEEDANCE 8.36 PCI/L 5 pCi/L 2024 Archived
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 20.1 PCI/L 15 pCi/L 2024 Archived
Combined Radium (-226 and -228) MCL EXCEEDANCE 6.2 PCI/L 5 pCi/L 2024 Archived
Gross Alpha, Excl. Radon and U MCL EXCEEDANCE 15.65 PCI/L 15 pCi/L 2024 Archived
Combined Radium (-226 and -228) MONITORING AND REPORTING — 5 pCi/L 2023 Resolved
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2023 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

18 violations are on record since 2015, of which 13 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Grinnell Water Department
PWSID IA7930008
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 9,553
Service connections 3,600
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Grinnell tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 3.10 ppb, 21% of the action level.
Does Grinnell water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Grinnell? ▼
Grinnell Water Department (PWSID IA7930008). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-09-15. No significant deficiencies were recorded.

What Should Grinnell 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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