A96/100
ONAWA MUNICIPAL WATER PLANT — Water Quality Report 2026
Serving 2,906 people · Iowa
Water Source
Groundwater
County
—
System ID
IA6739095
Violations
1
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1988.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About ONAWA MUNICIPAL WATER PLANT
Is ONAWA MUNICIPAL WATER PLANT water safe to drink?
ONAWA MUNICIPAL WATER PLANT water receives a grade of A (96/100), which is considered excellent. Out of 31 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has ONAWA MUNICIPAL WATER PLANT detected?
31 contaminants were tested in ONAWA MUNICIPAL WATER PLANT's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does ONAWA MUNICIPAL WATER PLANT have any EPA violations?
Yes, ONAWA MUNICIPAL WATER PLANT has 1 EPA violation(s) on record, with the most recent in 1988. Violation types include MR.
How many people does ONAWA MUNICIPAL WATER PLANT serve?
ONAWA MUNICIPAL WATER PLANT serves approximately 2,906 people, Iowa. The system provides water to 1 community: Onawa.
What type of water does ONAWA MUNICIPAL WATER PLANT provide?
ONAWA MUNICIPAL WATER PLANT sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IA6739095.
How does ONAWA MUNICIPAL WATER PLANT compare to other utilities in Iowa?
ONAWA MUNICIPAL WATER PLANT scores 96/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Iowa state page for a full comparison of water systems.