Water Quality in Rancho Cucamonga, CA (92308)
EPA violation data for public water systems serving ZIP code 92308.
Active Health Violations
4 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 68% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
42,709
Population
28
Water Systems
13
Violations (5yr)
4
Health-Based
Location
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Water Systems Serving This Area (28)
Chino Basin Mwd
San Gabriel Valley Wc - Fontana
San Bernardino City
Cucamonga Valley Water District
Ontario Municipal Utilities Company
Victorville Water District
San Bernardino Valley Wd
East Valley Water District
West Valley Water District
Hesperia Wd
Golden State Water Co - Barstow
Golden State Water Co - Apple Vly South
Golden State Water Co - Wrightwood
All resolvedThunderbird Cwd
1 health-basedGolden State Water Co - Apple Vly North
Golden State Water Co - Morongo Del Sur
Mariana Ranchos Cwd
Apple Valley Heights Cwd
1 health-basedApple Valley Foothill Cwd
1 health-basedGolden State Water Co - Lucerne
Rancheritos Mwc
All resolvedRancheritos #2
Bear Valley Mhp
All resolvedGolden State Water Desert View
Cvusd Facilities/M&O
1 health-basedApple Valley Faith Center
The High Adobe
All resolvedFrank Secombe
Contaminants Found
At high levels, nitrate can cause blue baby syndrome in infants.
Lead and copper testing requirement. Lead exposure can cause developmental harm in children.
Missed testing deadlines — not a detection of bacteria.
Lead & Copper Levels
Lead (Pb)
Within limitSampled: Jul 2025
How Does This Compare?
Rancho Cucamonga (92308) has more violations than 68% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 13.
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
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.