Williamsburg, IA 52361
1 water system • 3,345 residents
Moderate water quality - consider filtration
Score: 45/100
Graded on EPA violations, contaminants, severity, compliance, and enforcement history. See methodology.
Data updated June 2026 • Sources: EPA ECHO and EPA Envirofacts
8
Contaminants Detected
78
Violations on Record
11
Health-Based Violations
0
Recent Violations
Grade Breakdown
45 / 100 points
Recommended Water Filters
- ✓Point-of-Use Carbon Filter (NSF-certified for lead)
- ✓Reverse Osmosis or Ion Exchange Filter
- ✓Ultraviolet (UV) Purification
- ✓Activated Carbon Filter (disinfection byproducts)
Consult a water quality specialist for personalized recommendations.
Williamsburg vs IA & National Average
Detected Contaminants
8 contaminants detected across water systems serving this ZIP code
| Contaminant | Category |
|---|---|
| Nitrate | Agricultural |
| Nitrite | Agricultural |
| Total Haloacetic Acids (HAA5) | Disinfection Byproduct |
| TTHM | Disinfection Byproduct |
| Lead and Copper Rule | Heavy Metal |
| Coliform (TCR) | Microorganism |
| Groundwater Rule | Other |
| Gross Alpha, Excl. Radon and U | Radiological |
Water System Information
- Systems Serving This ZIP:
- WILLIAMSBURG PUBLIC WATER SUPPLY
- Population Served:
- 3,345
- Systems With Violations:
- 1 of 1
- Major Violations:
- 36
- Enforcement Actions:
- 78
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.