B73/100
JEFFERSON WATER DEPARTMENT — Water Quality Report 2026
Serving 4,182 people · Iowa
Water Source
Groundwater
County
—
System ID
IA3742004
Violations
8
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.41 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | < 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2020.
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 JEFFERSON WATER DEPARTMENT
Is JEFFERSON WATER DEPARTMENT water safe to drink?
JEFFERSON WATER DEPARTMENT water receives a grade of B (73/100), which is considered good. Out of 52 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has JEFFERSON WATER DEPARTMENT detected?
52 contaminants were tested in JEFFERSON WATER DEPARTMENT's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does JEFFERSON WATER DEPARTMENT have any EPA violations?
Yes, JEFFERSON WATER DEPARTMENT has 8 EPA violation(s) on record, with the most recent in 2020. Violation types include MR, MCL. 2 are health-based violations.
How many people does JEFFERSON WATER DEPARTMENT serve?
JEFFERSON WATER DEPARTMENT serves approximately 4,182 people, Iowa. The system provides water to 1 community: Jefferson.
What type of water does JEFFERSON WATER DEPARTMENT provide?
JEFFERSON WATER DEPARTMENT sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IA3742004.
How does JEFFERSON WATER DEPARTMENT compare to other utilities in Iowa?
JEFFERSON WATER DEPARTMENT scores 73/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Iowa state page for a full comparison of water systems.