Mount Vernon, OH 43050

4 water systems • 24,821 residents

Excellent water quality with minimal contaminants

A

Score: 83/100

Graded on EPA violations, contaminants, severity, compliance, and enforcement history. See methodology.

Data updated June 2026 • Sources: EPA ECHO and EPA Envirofacts

11

Contaminants Detected

64

Violations on Record

12

Health-Based Violations

0

Recent Violations

Grade Breakdown

Contaminant Count14 / 25
Violation History23 / 25
Contaminant Severity21 / 25
System Compliance0 / 15
Enforcement History0 / 10
Total Score83%

83 / 100 points

Recommended Water Filters

  • ✓Point-of-Use Carbon Filter (NSF-certified for lead)
  • ✓Ultraviolet (UV) Purification
  • ✓Activated Carbon Filter (disinfection byproducts)
Compare filter types in our Filter Guide →

Consult a water quality specialist for personalized recommendations.

Mount Vernon vs OH & National Average

Detected Contaminants

11 contaminants detected across water systems serving this ZIP code

ContaminantCategory
Total Haloacetic Acids (HAA5)Disinfection Byproduct
TTHMDisinfection Byproduct
LEAD AND COPPER RULE REVISIONSHeavy Metal
Coliform (TCR)Microorganism
2,4-DOther
2,4,5-TPOther
BHC-GAMMAOther
Consumer Confidence RuleOther
EndrinOther
MethoxychlorOther
ToxapheneOther

Water System Information

Systems Serving This ZIP:
GRANDVIEW MHP B, KNOX COUNTY WATER AND WASTEWATER PWS, MOUNT VERNON CITY PWS, GRANDVIEW MHP A PWS
Population Served:
24,821
Systems With Violations:
4 of 4
Major Violations:
38
Enforcement Actions:
58

Nearby Areas

43022

Gambier • 7.3 mi away

B

43019

Fredericktown • 8.2 mi away

C

43037

Martinsburg • 9.9 mi away

B

43014

Danville • 11.6 mi away

F

43080

Utica • 13.6 mi away

C

44822

Butler • 15.5 mi away

B

Frequently Asked Questions

What does the grade mean?

Our A–F grade ranks this ZIP code's water quality against every other analyzed ZIP in the country, based on EPA data. A = among the best, F = among the most troubled.

Is my tap water safe to drink?

Water systems regulated by the EPA must comply with Safe Drinking Water Act standards. However, if you're concerned about water quality, consider a water filter appropriate for your contaminants.

How often is the data updated?

We update our data quarterly with the latest EPA ECHO and Envirofacts data. Historical violations are tracked to identify patterns.

What filters do you recommend?

Filter recommendations are based on detected contaminants in your area. See our Filter Guide for detailed information about different filter types.