A94/100
DENISON WATER SUPPLY — Water Quality Report 2026
Serving 9,381 people · Iowa
Water Source
Groundwater
County
—
System ID
IA2424027
Violations
3
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
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 2000.
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 DENISON WATER SUPPLY
Is DENISON WATER SUPPLY water safe to drink?
DENISON WATER SUPPLY water receives a grade of A (94/100), which is considered excellent. Out of 51 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has DENISON WATER SUPPLY detected?
51 contaminants were tested in DENISON WATER SUPPLY's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does DENISON WATER SUPPLY have any EPA violations?
Yes, DENISON WATER SUPPLY has 3 EPA violation(s) on record, with the most recent in 2000. Violation types include MR.
How many people does DENISON WATER SUPPLY serve?
DENISON WATER SUPPLY serves approximately 9,381 people, Iowa. The system provides water to 1 community: Denison.
What type of water does DENISON WATER SUPPLY provide?
DENISON WATER SUPPLY sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IA2424027.
How does DENISON WATER SUPPLY compare to other utilities in Iowa?
DENISON WATER SUPPLY scores 94/100 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.