Water Quality in Columbia, MD (21104)
EPA violation data for public water systems serving ZIP code 21104.
Active Health Violations
2 health-based violations found in the past 5 years, with at least one still unresolved. Contaminant levels have exceeded federal safety limits. Consider testing your tap water independently.
More violations than 57% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
6,052
Population
15
Water Systems
7
Violations (5yr)
2
Health-Based
Location
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Water Systems Serving This Area (15)
Howard County D.P.W. Distribution
All resolvedEllicott City
City Of Westminster
Freedom District
County Line Deli
Peter Pan Learning Center
Floyd'S Crossroads Pub
Bon Secour Spiritual Center
2 health-basedChapelgate Presbyterian Church
Marriottsville Spiritual Center
Waverly Mansion
O'Farrell Thomas
Patapsco State Park ( Mckeldin)
Bon Secours
Marriottsville Quarry
Contaminants Found
Missed testing deadlines — not a detection of bacteria.
Annual water quality report delivery requirement.
Lead and copper testing requirement. Lead exposure can cause developmental harm in children.
How Does This Compare?
Columbia (21104) has more violations than 57% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 7.
Recommended Water Filters
Based on health-based violations detected in your area, these filter types are commonly used to address similar contaminants. Consult your water utility's Consumer Confidence Report for the most current data.
Reverse Osmosis System
Highly effective at removing heavy metals, dissolved solids, and a wide range of contaminants. Recommended for homes with lead or arsenic concerns.
Targets:Lead, Copper, Arsenic, Mercury, Cadmium
Look for:NSF/ANSI 58 certified
UV Water Purifier
Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.
Targets:E. coli, Coliform, Giardia, Cryptosporidium
Look for:NSF/ANSI 55 (Class A) certified
Always look for filters certified by NSF International for the specific contaminants you want to remove. This is general educational information, not an endorsement of any specific product.