Missouri
Water Quality Report
78 Good
Average Score
78/100
Water Systems
523
Population
5.6M
Violations
787 172 unresolved
Score Distribution
70 A
50 B
27 C
5 D
12 F
Top Contaminant Violations
| Contaminant | Violations |
|---|---|
| Copper (90th percentile) | 3 |
| Lead (90th percentile) | 1 |
Lowest Scoring Water Systems
0
Lake Sherwood Subd F
MO6036039 Des Peres, MO 1,100 served
0
Rolling Oaks Subdivision F
FL6090150 St. Louis, MO 11,572 served
0
Mo American Ironton F
MO4010402 Chesterfield, MO 1,460 served
0
Maryville Pws F
MO1010508 Maryville, MO 10,775 served
2
Liberty Pws F
MO1010466 Liberty, MO 30,800 served
Counties in Missouri
Cities in Missouri
View all 336 cities →Popular City Comparisons in Missouri
Quickly compare major cities in Missouri by water quality score and grade.
Frequently Asked Questions
Is tap water in Missouri safe to drink?
Missouri has an average WaterQ score of 78/100 across 523 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 Missouri?
WaterQ currently tracks 523 public water systems in Missouri.
Where can I compare cities in Missouri?
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.