Iowa
Water Quality Report
72 Good
Average Score
72/100
Water Systems
335
Population
2.8M
Violations
346 20 unresolved
Score Distribution
25 A
22 B
12 C
5 D
9 F
Top Contaminant Violations
| Contaminant | Violations |
|---|---|
| Copper (90th percentile) | 1 |
Lowest Scoring Water Systems
0
Altoona Water Supply F
IA7707030 Altoona, IA 19,565 served
0
Coralville Muni Water System F
IA5208071 Coralville, IA 22,318 served
0
Oskaloosa Municipal Water Dept F
IA6273005 Oskaloosa, IA 12,808 served
0
Iowa City Water Department F
IA5225079 Iowa City, IA 68,753 served
10
Clarksville Water Supply F
IA1228038 Marshalltown, IA 1,254 served
Counties in Iowa
Cities in Iowa
View all 268 cities →Popular City Comparisons in Iowa
Quickly compare major cities in Iowa by water quality score and grade.
Frequently Asked Questions
Is tap water in Iowa safe to drink?
Iowa has an average WaterQ score of 72/100 across 335 public water systems. Safety can vary by city and system, so check your local report for recent violations and contaminants.
How many water systems are in Iowa?
WaterQ currently tracks 335 public water systems in Iowa.
Where can I compare cities in Iowa?
Use the city list below to open detailed reports, or visit the compare tool to benchmark two cities side-by-side on score, grade, and system coverage.