Public Water System

GRINNELL WATER DEPARTMENT

PWSID IA7930008 · Iowa · 9,564 people served

Failing

GRINNELL WATER DEPARTMENT is an EPA-regulated public water system in Iowa (PWSID IA7930008). It serves an estimated 9,564 residents — a small town of customers — across 1 community across 1 ZIP code.

Over the past five years, GRINNELL WATER DEPARTMENT has recorded 45 EPA health-based violations. The grade of F summarizes this compliance pattern. Specific contaminants, dates, and rule citations are listed in the violation history below.

Service Area

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Centered on the averaged ZIP-code centroid of 1 ZIP served.

Population

9,564

Cities

ZIPs

Violations

EPA Health-Based Violations

Health-based Maximum Contaminant Level (MCL) violations on file for GRINNELL WATER DEPARTMENT over the past five years of EPA SDWIS reporting.

Radiumradiological

EPA Code 4010 · Maximum Contaminant Level Exceedance

violations

EPA Limit

5 pCi/L

Last Reading

6.4 PCI/L

First Reported

Jan 2024

Most Recent

Apr 2025

What this violation means

Radium-226 and Radium-228 occur naturally in groundwater, particularly in regions with granite or sandstone aquifers. Long-term ingestion increases the risk of bone, sinus, and other cancers because radium concentrates in bone tissue.

Recommended precautions

→Reverse osmosis and ion exchange (water softeners) remove radium.
→Boiling does NOT remove radium and may concentrate it.
→Private well users in radium-rich geology should test every 3–5 years.

Read the complete guide to Radium

Radiumradiological

EPA Code 4000 · Maximum Contaminant Level Exceedance

violations

EPA Limit

5 pCi/L

Last Reading

22 PCI/L

First Reported

Jan 2024

Most Recent

Jan 2025

What this violation means

Recommended precautions

→Reverse osmosis and ion exchange (water softeners) remove radium.
→Boiling does NOT remove radium and may concentrate it.
→Private well users in radium-rich geology should test every 3–5 years.

Read the complete guide to Radium

Source: EPA Safe Drinking Water Information System (SDWIS). Health-based violations only. Older violations may have been resolved; check your utility's most recent Consumer Confidence Report for current status.

Cities Served by GRINNELL WATER DEPARTMENT

GRINNELL

ZIP Codes Served

50112

About this system

EPA records this system as PWSID IA7930008. Data reflects the most recent EPA SDWIS publication as of 2026-05-18. Public Water System Identifiers (PWSIDs) are assigned by the EPA's Safe Drinking Water Act program to track every regulated water utility in the United States. The first two letters typically indicate the state primacy agency. For real-time water quality information, contact GRINNELL WATER DEPARTMENT directly or review their annual Consumer Confidence Report (CCR).