Modesto, California Water Quality Report
Comprehensive water safety analysis • Updated February 2026
Modesto maintains excellent water quality with all 8 tested contaminants well below EPA safety limits.
Water Safety Overview
Generally Safe. Modesto's tap water meets EPA standards. Score: 91/100.
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All Detected Contaminants
8 contaminants tested • EPA SDWIS data
| Contaminant | Level Detected | EPA Limit | % of Limit | Status |
|---|---|---|---|---|
Lead | 0.0028 mg/L | 0.015 mg/L | 18.5% | Safe |
Fluoride | 0.541 mg/L | 4.00 mg/L | 13.5% | Safe |
Total Trihalomethanes | 6.52 ug/L | 80.00 ug/L | 8.2% | Safe |
Chromium | 0.0050 mg/L | 0.100 mg/L | 5.0% | Safe |
Nitrate | 0.454 mg/L | 10.00 mg/L | 4.5% | Safe |
Haloacetic Acids | 2.52 ug/L | 60.00 ug/L | 4.2% | Safe |
Copper | 0.054 mg/L | 1.30 mg/L | 4.1% | Safe |
Mercury | 0.0001 mg/L | 0.0020 mg/L | 2.6% | Safe |
Recommended Water Filters for Modesto
Based on detected contaminants
Reverse Osmosis System
Best for Modesto. Removes 95-99% of contaminants including heavy metals, PFAS, and nitrates.
- ✓ Removes lead
- ✓ Removes nitrates
- ✓ Removes total dissolved solids
Activated Carbon Filter
Good for Modesto. Removes chlorine, improves taste, and filters many organic compounds.
- ✓ Removes chlorine and chloramine
- ✓ Improves taste and odor
- ✓ Filters pesticides and VOCs
NSF 53 Lead Certification Required
Lead detected in Modesto. Ensure any filter is NSF/ANSI 53 certified for lead removal.
Water System Information
MODESTO WATER SYSTEM
- PWS ID:
- CA734278
- Population Served:
- 215,025
- Water Source:
- mixed
Modesto Water Quality Score
Based on EPA contaminant data and compliance records
Positive Findings
- Excellent overall water quality
- All tested contaminants well below EPA limits
- No violations in the past 3 years
Protect Your Family's Water
Even with good water quality, many families choose to filter their water for extra peace of mind.
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